JP2007330048A - Axial-gap motor and compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an axial-gap motor and a compressor capable of reducing force affecting a rotor in an axial direction by canceling gravity acting on a movable portion and thrust force with each other, and improving reliability and efficiency with a simple structure in the axial gap-type motor disposed in a vertical direction. <P>SOLUTION: This axial-gap motor has a stator 40 in which a coil is wound around a magnetic body; and a lower rotor 30A and an upper rotor 30B which are fixed at a rotating shaft 4, and are rotatingly driven by the stator 40. The length L1 of an air gap between the lower rotor 30A and the stator 40 is set to be shorter than the length L2 of an air gap between the upper rotor 30B and the stator 40. The lower rotor 30A is attracted to the stator 40 more strongly than the upper rotor 30B; and at least a portion of magnet force in the axial direction between the stator 40 and the upper rotor 30B, and between the stator 40 and the lower rotor 30A is cancelled by gravity of moving portions (30A, 30B, 4, 5) including the rotor. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vertically installed axial gap type motor and a compressor.

  Conventionally, as an axial gap type motor, there is a motor having a stator and a rotor disposed at a position facing the stator in the axial direction (see, for example, JP-A-11-206077 (Patent Document 1)).

In this axial gap type motor, the magnetic force applied to the rotor and the gravitational force of the rotor increase the axial attractive force, and a large thrust force acts on the rotor, so that the bearing wears and requires a structure for the thrust receiver. For example, when used in a compressor, there is a problem that a sliding loss between a fixed portion of the compression mechanism portion and a contact portion of the movable portion increases.
Japanese Patent Laid-Open No. 11-206077

  In view of the above, an object of the present invention is to provide an axial gap type motor arranged in a vertical position so that the force acting on the rotor in the axial direction is applied so that the gravity and the thrust force acting on the movable part including the rotor cancel each other with a simple configuration. It is an object of the present invention to provide an axial gap motor and a compressor that can be reduced and can improve reliability and equipment efficiency.

In order to solve the above problems, the axial gap type motor of the present invention is
It is an axial gap type motor arranged vertically,
A stator in which a coil is wound around a magnetic material;
A rotor fixed to the rotating shaft and disposed at a position facing the stator in the axial direction;
The axial magnetic force between the stator and the rotor is at least partially canceled by the gravity of the movable part including the rotor.

  Here, the vertical placement means that the rotation axis is not only arranged in the vertical direction, but the rotation axis may be inclined with respect to the horizontal plane, and the load of the rotor acts downward along the rotation axis. If it is.

  Compared to the radial gap type motor, the axial gap type motor does not generate a radial force against the rotating shaft, and deforms the stator, deforms the sealed container via the stator, There is no bending in the radial direction. Furthermore, according to the axial gap type motor having the above-described configuration, a thrust force against the gravity of the movable part including the rotor is generated by an axial magnetic force between the stator and the rotor of the axial gap type motor. In this way, the thrust force peculiar to the axial gap type motor and gravity are made to at least partially cancel each other out, so the thrust force peculiar to the axial gap type motor is made extremely small, and the device equipped with the axial gap type motor is mounted. The sliding loss at the contact portion between the fixed portion and the movable portion can be minimized, and the efficiency is improved. Therefore, in the axial gap type motor arranged vertically, the force acting in the axial direction on the rotor can be reduced by at least partially canceling out the gravity and the thrust force with a simple configuration.

  In addition, since the air gap between the stator and the rotor is axial in the axial gap type motor, the axial magnetic attractive force in the axial direction is adjusted by the air gap length or the like as compared with the radial gap type motor. Is extremely easy.

Moreover, the axial gap type motor of one embodiment is
The rotors are respectively disposed on both sides of the stator in the axial direction,
An axial magnetic attractive force between the lower rotor and the stator is larger than an axial magnetic attractive force between the upper rotor and the stator.

  According to the axial gap type motor of the above embodiment, since the rotor is arranged on both sides in the axial direction of the stator, it is only necessary to use one stator that uses copper that is difficult to manufacture and expensive than the rotor, thereby improving productivity. And cost reduction.

  Further, in the axial gap type motor according to an embodiment, the length of the air gap between the lower rotor and the stator is shorter than the length of the air gap between the upper rotor and the stator. It is characterized by that.

  According to the axial gap type motor of the above embodiment, the length of the air gap between the lower rotor and the stator is made shorter than the length of the air gap between the upper rotor and the stator. The axial magnetic attractive force between the rotor and the stator can be made larger than the axial magnetic attractive force between the upper rotor and the stator. Further, in this axial gap type motor, since the surface where the rotor and the stator face each other is a flat surface, the adjustment of the length of the air gap between the lower rotor and the stator and between the upper rotor and the stator is accurate. It can be done easily and can be manufactured easily. In particular, it is more effective when the magnetic core of the rotor and the magnetic core of the stator face each other across the air gap. Further, even when no current is supplied to the stator, a difference occurs in the magnetic attractive force acting on each rotor, and sliding friction between the contact portion between the fixed portion and the movable portion is reduced, so that the motor can be easily started.

Moreover, the axial gap type motor of one embodiment is
The lower rotor and the upper rotor have magnets respectively.
The magnet of the lower rotor is thicker than the magnet of the upper rotor.

  According to the axial gap type motor of the above-described embodiment, the magnetic attractive force in the axial direction between the lower rotor and the stator is set by making the thickness of the magnet of the lower rotor larger than the thickness of the magnet of the upper rotor. Can be made larger than the axial magnetic attractive force between the upper rotor and the stator. Although it depends on the method of manufacturing the magnet, especially when it is manufactured by cutting along a plane perpendicular to the direction of magnetic field orientation, it is possible to easily manufacture a magnet having a desired thickness. Also, a bonded magnet (a magnet in which magnet powder is bound by a binding material) can be easily manufactured. Further, even when no current is supplied to the stator, a difference occurs in the magnetic attractive force acting on each rotor, and sliding friction between the contact portion between the fixed portion and the movable portion is reduced, so that the motor can be easily started.

Moreover, the axial gap type motor of one embodiment is
The lower rotor and the upper rotor have magnets respectively.
A magnetic pole area facing the air gap of the magnet of the lower rotor is wider than a magnetic pole area facing the air gap of the magnet of the upper rotor.

  According to the axial gap type motor of the above embodiment, the magnetic pole area facing the upper air gap of the lower rotor magnet is made larger than the magnetic pole area facing the lower air gap of the upper rotor magnet. The axial magnetic attractive force between the lower rotor and the stator can be larger than the axial magnetic attractive force between the upper rotor and the stator. Moreover, since the magnetic flux linked to the stator can be directly changed, a desired thrust force can be easily generated. Further, even when no current is supplied to the stator, a difference occurs in the magnetic attractive force acting on each rotor, and sliding friction between the contact portion between the fixed portion and the movable portion is reduced, so that the motor can be easily started.

Moreover, the axial gap type motor of one embodiment is
The upper rotor and the lower rotor have magnets respectively.
The residual magnetic flux density or maximum energy product facing the air gap of the lower rotor magnet is larger than the residual magnetic flux density or maximum energy product facing the air gap of the upper rotor magnet. .

  According to the axial gap type motor of the above embodiment, the residual magnetic flux density (or maximum energy product) facing the upper air gap of the lower rotor magnet is set to the residual magnetic flux density facing the lower air gap of the upper rotor magnet. By making it greater than the magnetic flux density (or maximum energy product), the axial magnetic attractive force between the lower rotor and the stator is greater than the axial magnetic attractive force between the upper rotor and the stator. can do. Moreover, since the magnetic flux linked to the stator can be directly changed by changing the operating point magnetic flux density, a desired thrust force can be easily generated. Further, even when no current is supplied to the stator, a difference occurs in the magnetic attractive force acting on each rotor, and sliding friction between the contact portion between the fixed portion and the movable portion is reduced, so that the motor can be easily started.

An axial gap type motor according to another embodiment of the present invention is
The stators are arranged on both sides of the rotor in the axial direction,
An axial magnetic attractive force between the rotor and the upper stator is larger than an axial magnetic attractive force between the rotor and the lower stator.

  According to the axial gap type motor of the above embodiment, since the stators are arranged on both sides in the axial direction of the rotor, the flux linkage is increased and the output is improved.

  Moreover, the axial gap type motor of one embodiment is characterized in that the rotor has magnets close to the upper stator and the lower stator.

  According to the axial gap type motor of the above embodiment, since the magnetic fluxes on both sides of the magnet can be linked to the stators on both sides, the number of magnets can be reduced and the cost can be reduced. In addition, the core which consists of a magnetic body which protects a magnet, ie, a head core, may exist on the surface of a magnet, and what is necessary is just to link the magnetic flux of both surfaces of a magnet to the stator of each side.

Moreover, the axial gap type motor of one embodiment is
The rotor has a magnetic plate and magnets fixed on both sides in the axial direction of the magnetic plate,
The upper magnet of the rotor is close to the upper stator, while the lower magnet of the rotor is close to the lower stator.

  According to the axial gap type motor of the above embodiment, the magnet can be easily fixed to the rotor and can be easily held on the rotating shaft. It is also possible to provide a skew effect by shifting the magnetic pole distribution on both sides of the rotor. In addition, a head core may be provided on the surface of the magnet. In short, only the magnetic flux on one side of the magnet needs to be linked to each stator.

  In the axial gap motor according to an embodiment, the length of the air gap between the rotor and the upper stator is shorter than the length of the air gap between the rotor and the lower stator. It is characterized by that.

  According to the axial gap type motor of the above embodiment, the length of the air gap between the rotor and the upper stator is made shorter than the length of the air gap between the rotor and the lower stator. The axial magnetic attractive force between the upper stator and the stator can be made larger than the axial magnetic attractive force between the rotor and the lower stator. In addition, the length of the air gap between the rotor and the upper stator and between the rotor and the lower stator can be easily adjusted, and manufacturing can be facilitated. In addition, since the axial gap type motor has a flat surface on which the rotor and the stator face each other, the length of the air gap can be accurately set. In particular, it is more effective when the magnetic core of the rotor and the magnetic core of the stator face each other across the air gap. Further, even when the stator is not energized, a difference occurs in the magnetic attractive force acting on the rotor, and the sliding friction between the contact portion between the fixed portion and the movable portion is reduced, so that the motor can be easily started.

Moreover, the axial gap type motor of one embodiment is
The rotor has a magnetic plate and magnets fixed on both sides in the axial direction of the magnetic plate,
The magnet on the upper side of the rotor is thicker than the magnet on the lower side of the rotor.

  According to the axial gap type motor of the embodiment, the thickness of the magnet close to the stator at the top of the rotor is made larger than the thickness of the magnet near the stator at the bottom of the rotor, thereby The axial magnetic attractive force between them can be made larger than the axial magnetic attractive force between the rotor and the lower stator. Although it depends on the method of manufacturing the magnet, especially when it is manufactured by cutting along a plane perpendicular to the direction of magnetic field orientation, it is possible to easily manufacture a magnet having a desired thickness. Also, a bonded magnet (a magnet in which magnet powder is bound by a binding material) can be easily manufactured. Further, even when the stator is not energized, a difference occurs in the magnetic attractive force acting on the rotor, and the sliding friction between the contact portion between the fixed portion and the movable portion is reduced, so that the motor can be easily started.

Moreover, the axial gap type motor of one embodiment is
The rotor has a magnetic plate and magnets fixed on both sides in the axial direction of the magnetic plate,
The magnetic pole area facing the air gap of the magnet on the upper side of the rotor is wider than the magnetic pole area facing the air gap of the magnet on the lower side of the rotor.

  According to the axial gap type motor of the above embodiment, the magnetic pole area facing the upper air gap of the upper magnet of the rotor is made larger than the magnetic pole area facing the lower air gap of the lower magnet of the rotor. Thus, the axial magnetic attractive force between the rotor and the upper stator can be made larger than the axial magnetic attractive force between the rotor and the lower stator. Moreover, since the magnetic flux linked to the stator can be directly changed, a desired thrust force can be easily generated. Further, even when the stator is not energized, a difference occurs in the magnetic attractive force acting on the rotor, and the sliding friction between the contact portion between the fixed portion and the movable portion is reduced, so that the motor can be easily started.

Moreover, the axial gap type motor of one embodiment is
The rotor has a magnetic plate and magnets fixed on both sides in the axial direction of the magnetic plate,
The residual magnetic flux density or maximum energy product facing the air gap of the magnet on the upper side of the rotor is greater than the residual magnetic flux density or maximum energy product facing the air gap of the magnet on the lower side of the rotor. Features.

  According to the axial gap type motor of the above embodiment, the residual magnetic flux density (or maximum energy product) facing the upper air gap of the upper magnet of the rotor is opposed to the lower air gap of the lower magnet of the rotor. By making it larger than the residual magnetic flux density (or maximum energy product), the axial magnetic attractive force between the rotor and the upper stator is made larger than the axial magnetic attractive force between the rotor and the lower stator. Can be bigger. Moreover, since the magnetic flux linked to the stator can be directly changed by changing the operating point magnetic flux density, a desired thrust force can be easily generated. Further, even when the stator is not energized, a difference occurs in the magnetic attractive force acting on the rotor, and the sliding friction between the contact portion between the fixed portion and the movable portion is reduced, so that the motor can be easily started.

  The axial gap motor of one embodiment is characterized in that the ampere turn of the upper stator is larger than the ampere turn of the lower stator.

  According to the axial gap type motor of the above-described embodiment, the ampere turn of the upper stator is made larger than the ampere turn of the lower stator so that the axial magnetic attractive force between the rotor and the upper stator is increased. Can be made larger than the magnetic attractive force in the axial direction between the rotor and the lower stator. In addition, the thrust force can be generated and the thrust force can be easily adjusted according to the output by changing the number of windings or current of the stator coil between the lower portion and the upper portion without having a plurality of magnet shapes. In addition, since no difference in magnetic attraction force is generated in the rotor when no current is supplied to the stator, the sliding friction between the contact portion between the fixed portion and the movable portion increases, so that reverse rotation when the motor is stopped can be prevented. Therefore, it is suitable for motors mounted on compressors and fans.

  Also, the axial gap motor of one embodiment is characterized in that the magnetic resistance of the lower stator is larger than the magnetic resistance of the upper stator.

  According to the axial gap type motor of the above embodiment, the magnetic resistance of the lower stator is made larger than the magnetic resistance of the upper stator, so that the axial magnetic attractive force between the rotor and the upper stator is increased. Can be made larger than the magnetic attractive force in the axial direction between the rotor and the lower stator. For example, it is only necessary to change the thickness of the back yoke of the stator, and this can be realized by thinning and saturation of the stator back yoke on the side where the magnetic attractive force in the axial direction is to be weakened. In this case, the weight can be reduced by reducing the materials used, and the overall length can be shortened. Further, even when no current is supplied to the stator, a difference occurs in the magnetic attractive force acting on each rotor, and sliding friction between the contact portion between the fixed portion and the movable portion is reduced, so that the motor can be easily started.

  The compressor according to the present invention includes any one of the above-described axial gap motors.

  According to the compressor having the above configuration, the sliding loss of the contact portion between the fixed portion and the movable portion of the compression mechanism can be minimized with a simple configuration, and the reliability and efficiency can be improved.

  As apparent from the above, according to the axial gap type motor of the present invention, the gravity and thrust force of the rotor including the movable portion cancel each other with a simple configuration while reducing the size by using the axial gap type motor. Thus, the axial force acting on the rotor can be reduced, and the reliability and efficiency can be improved.

  Further, according to the axial gap type motor of one embodiment, since the rotor is disposed on both sides of the stator in the axial direction, only one stator using copper, which is more difficult to manufacture and expensive than the rotor, is required. Improvement and cost reduction can be achieved.

  Further, according to the axial gap type motor of one embodiment, by making the length of the air gap between the lower rotor and the stator shorter than the length of the air gap between the upper rotor and the stator, The axial magnetic attractive force between the lower rotor and the stator can be made larger than the axial magnetic attractive force between the upper rotor and the stator. Moreover, since the rotor of the same form can be configured simply by disposing different air gaps, the number of rotor parts can be reduced. Further, even when no current is supplied to the stator, a difference occurs in the magnetic attractive force acting on each rotor, and sliding friction between the contact portion between the fixed portion and the movable portion is reduced, so that the motor can be easily started.

  Further, according to the axial gap type motor of one embodiment, the magnetism in the axial direction between the lower rotor and the stator is increased by making the thickness of the magnet of the lower rotor larger than the thickness of the magnet of the upper rotor. The attractive force can be greater than the axial magnetic attractive force between the upper rotor and the stator. Further, even when no current is supplied to the stator, a difference occurs in the magnetic attractive force acting on each rotor, and sliding friction between the contact portion between the fixed portion and the movable portion is reduced, so that the motor can be easily started.

  Further, according to the axial gap type motor of one embodiment, the magnetic pole area facing the upper air gap of the lower rotor magnet is made larger than the magnetic pole area facing the lower air gap of the upper rotor magnet. Thus, the axial magnetic attractive force between the lower rotor and the stator can be made larger than the axial magnetic attractive force between the upper rotor and the stator. Further, even when no current is supplied to the stator, a difference occurs in the magnetic attractive force acting on each rotor, and sliding friction between the contact portion between the fixed portion and the movable portion is reduced, so that the motor can be easily started.

  Further, according to the axial gap type motor of one embodiment, the residual magnetic flux density (or maximum energy product) facing the upper air gap of the lower rotor magnet is set to be opposed to the lower air gap of the upper rotor magnet. By making it larger than the residual magnetic flux density (or maximum energy product), the axial magnetic attractive force between the lower rotor and the stator is made larger than the axial magnetic attractive force between the upper rotor and the stator. Can also be increased. Further, even when no current is supplied to the stator, a difference occurs in the magnetic attractive force acting on each rotor, and sliding friction between the contact portion between the fixed portion and the movable portion is reduced, so that the motor can be easily started.

  Further, according to the axial gap type motor of another embodiment of the present invention, since the stators are arranged on both sides in the axial direction of the rotor, the interlinkage magnetic flux increases and the output can be improved.

  According to the axial gap type motor of one embodiment, since the rotor has magnets close to the upper stator and the lower stator, the magnetic fluxes on both sides of the magnets are linked to the stators on both sides. The number of magnets can be reduced and the cost can be reduced. Further, even when no current is supplied to the stator, a difference occurs in the magnetic attractive force acting on each rotor, and sliding friction between the contact portion between the fixed portion and the movable portion is reduced, so that the motor can be easily started.

  According to the axial gap type motor of an embodiment, the rotor includes a magnetic plate and magnets fixed on both sides in the axial direction of the magnetic plate, and the upper magnet of the rotor is the upper portion. While the magnet close to the stator is close to the lower stator, the magnet can be easily fixed to the rotor and held on the rotating shaft. Furthermore, since the upper and lower magnetic circuits can be made independent by one rotor, it is possible to more easily provide a difference in magnetic attractive force. Further, even when no current is supplied to the stator, a difference occurs in the magnetic attractive force acting on each rotor, and sliding friction between the contact portion between the fixed portion and the movable portion is reduced, so that the motor can be easily started.

  Further, according to the axial gap type motor of one embodiment, by making the length of the air gap between the rotor and the upper stator shorter than the length of the air gap between the rotor and the lower stator, The axial magnetic attractive force between the rotor and the upper stator can be made larger than the axial magnetic attractive force between the rotor and the lower stator. Further, even when no current is supplied to the stator, a difference occurs in the magnetic attractive force acting on each rotor, and sliding friction between the contact portion between the fixed portion and the movable portion is reduced, so that the motor can be easily started.

  Further, according to the axial gap type motor of one embodiment, the thickness of the magnet on the upper side of the rotor is made larger than the thickness of the magnet on the lower side of the rotor, so that the axial gap between the rotor and the upper stator is increased. The magnetic attractive force can be made larger than the axial magnetic attractive force between the rotor and the lower stator. Further, even when no current is supplied to the stator, a difference occurs in the magnetic attractive force acting on each rotor, and sliding friction between the contact portion between the fixed portion and the movable portion is reduced, so that the motor can be easily started.

  Further, according to the axial gap type motor of one embodiment, the magnetic pole area facing the upper air gap of the upper magnet of the rotor is larger than the magnetic pole area facing the lower air gap of the lower magnet of the rotor. By doing so, the axial magnetic attractive force between the rotor and the upper stator can be made larger than the axial magnetic attractive force between the rotor and the lower stator. Further, even when no current is supplied to the stator, a difference occurs in the magnetic attractive force acting on each rotor, and sliding friction between the contact portion between the fixed portion and the movable portion is reduced, so that the motor can be easily started.

  Further, according to the axial gap type motor of one embodiment, the residual magnetic flux density (or the maximum energy product) facing the upper air gap of the upper magnet of the rotor is set to the lower air gap of the lower magnet of the rotor. By making it larger than the opposing residual magnetic flux density (or maximum energy product), the axial magnetic attractive force between the rotor and the upper stator is reduced to the axial magnetic attractive force between the rotor and the lower stator. Can be larger. Further, even when no current is supplied to the stator, a difference occurs in the magnetic attractive force acting on each rotor, and sliding friction between the contact portion between the fixed portion and the movable portion is reduced, so that the motor can be easily started.

  Further, according to the axial gap type motor of an embodiment, the ampere turn of the upper stator is made larger than the ampere turn of the lower stator so that the axial magnetic force between the rotor and the upper stator is increased. The attractive force can be larger than the axial magnetic attractive force between the rotor and the lower stator. In addition, the thrust force can be generated and the thrust force can be easily adjusted according to the output by changing the number of windings or current of the stator coil between the upper portion and the lower portion without having a plurality of magnet shapes. In addition, since no difference in magnetic attraction force is generated in the rotor when no current is supplied to the stator, the sliding friction between the contact portion between the fixed portion and the movable portion increases, so that reverse rotation when the motor is stopped can be prevented. Therefore, it is suitable for motors mounted on compressors and fans.

  Further, according to the axial gap type motor of one embodiment, the magnetic resistance of the lower stator is larger than the magnetic resistance of the upper stator, so that the axial magnetic force between the rotor and the upper stator is increased. The attractive force can be larger than the axial magnetic attractive force between the rotor and the lower stator. Further, even when no current is supplied to the stator, a difference occurs in the magnetic attractive force acting on each rotor, and sliding friction between the contact portion between the fixed portion and the movable portion is reduced, so that the motor can be easily started.

  Further, according to the compressor of the present invention, the sliding loss between the fixed portion of the compression mechanism portion and the contact portion of the movable portion can be minimized with a simple configuration, and the reliability and efficiency can be improved.

  The axial gap type motor and compressor of the present invention will be described in detail below with reference to the illustrated embodiments.

(First embodiment)
FIG. 1 shows a cross-sectional view of a compressor equipped with a vertical axial gap type motor according to a first embodiment of the present invention. This compressor is a high-pressure dome type, and the axial gap type motor of the first embodiment has a different air gap length between the rotor and the stator.

  As shown in FIG. 1, the compressor according to the first embodiment includes a hermetic container 1, a compression mechanism unit 2 disposed in the hermetic container 1, and in the hermetic container 1 and above the compression mechanism unit 2. And an axial gap type motor 3 that drives the compression mechanism section 2 via the rotary shaft 4. A suction pipe 11 is connected to the lower side of the sealed container 1, while a discharge pipe 12 is connected to the upper side of the sealed container 1. The refrigerant gas supplied from the suction pipe 11 is guided to the suction side of the compression mechanism unit 2.

  The axial gap type motor 3 is partly fixed on the inner side of the hermetic container 1, the stator 40 through which the rotating shaft 4 penetrates the center portion, and the axially upper side of the stator 40. The upper rotor 30B (upper part) is fixed by being externally fitted on the lower part, and the lower rotor 30A (lower part) is disposed on the lower side in the axial direction of the stator 40 and is fixed by being externally fitted to the rotary shaft 4. . The lower end side of the rotating shaft 4 to which the upper rotor 30B and the lower rotor 30A are fixed is connected to the compression mechanism section 2.

  The compression mechanism 2 includes a cylinder-shaped main body 20 and an upper end plate 8 and a lower end plate 9 attached to upper and lower opening ends of the main body 20, respectively. The rotating shaft 4 passes through the upper end plate 8 and the lower end plate 9 and is inserted into the main body 20. The rotating shaft 4 is rotatably supported by a bearing 21 provided on the upper end plate 8 of the compression mechanism unit 2 and a bearing 22 provided on the lower end plate 9 of the compression mechanism unit 2. A crankpin 5 is provided on the rotating shaft 4 in the main body 20 and compression is performed by a compression chamber 7 formed between a piston fitted and driven by the crankpin 5 and a corresponding cylinder. The piston rotates in an eccentric state or revolves to change the volume of the compression chamber.

  In the compressor configured as described above, when the compression mechanism unit 2 is driven by rotating the axial gap type motor 3, the refrigerant gas is supplied from the suction pipe 11 to the compression mechanism unit 2, and the compression mechanism unit 2 compresses the refrigerant gas. . Thus, the high-pressure refrigerant gas compressed by the compression mechanism unit 2 is discharged into the sealed container 1 from the discharge port 23 of the compression mechanism unit 2, and a groove (not shown) provided around the rotating shaft 4, the stator 40, an upper rotor 30B, a hole (not shown) penetrating the inside of the lower rotor 30A in the axial direction, a space between the stator 40, the upper rotor 30B, the outer periphery of the lower rotor 30A, and the inner surface of the hermetic container 1. Etc., and is discharged to the outside of the hermetic container 1 through the discharge pipe 12 after being carried to the upper space of the axial gap type motor 3.

  At this time, force by gravity acts on the movable parts (30A, 30B, 4, 5) including the rotor.

  FIG. 2 shows a perspective view of the lower rotor 30A. The upper rotor 30B has the same configuration as the lower rotor 30A (upside down).

  As shown in FIG. 2, the lower rotor 30A is arranged along the circumference on the disk-shaped back yoke 31 made of a magnetic material having a central hole 31a and the surface of the back yoke 31 facing the stator 40. The four fan-shaped permanent magnets 32 and the disk-shaped magnetic plate 33 having the central hole 33a are overlapped. Further, the magnetic plate 33 is provided with four slits 33b in a radial manner, and the permanent magnets 32 are arranged at predetermined intervals in the circumferential direction between the slits 33b. A circular hole 31b is provided in a region facing the slit 33b and in the vicinity of the central hole 31a. The slit 33b of the magnetic plate 33, the space between the permanent magnets 32, and the circular hole 31b of the back yoke 31 form a gas passage through which the refrigerant gas flows in the axial direction.

  In the lower rotor 30A and the upper rotor 30B, the four permanent magnets 32 are arranged so that the magnetic poles alternate in the circumferential direction. In addition, since magnetic flux is generated in the stator 40 in the axial direction, the magnetic poles of the surfaces of the upper rotor 30B and the lower rotor 30A facing the stator of the upper rotor 30B and the lower rotor 30A facing the stator have opposite polarities. In the upper rotor 30B and the lower rotor 30A, the four permanent magnets 32 are magnetically insulated from each other by the slits 33b of the magnetic plates 33.

  Further, the stator 40 shown in FIG. 1 has axial coils wound directly around a plurality of magnetic cores. For example, in the case of 4 poles, there are 6 magnetic cores and 6 coils each, which corresponds to concentrated winding 4 poles 6 slots of a radial gap type motor. That is, the coils 6 are arranged in the order of the U phase, the V phase, the W phase, the U phase, the V phase, and the W phase in the circumferential direction. Since the six magnetic cores are magnetically independent from each other, they are connected to magnetic plates arranged on both sides in the axial direction. The magnetic plate is provided with slits so that the regions facing the magnetic core are magnetically insulated. The axial coil is, for example, three-phase star-connected, and current is supplied from an inverter.

  In the air gap between the stator 40 and the upper rotor 30B and the air gap between the stator 40 and the lower rotor 30A, the magnetic plate of the stator 40 and the magnetic plates 33 of the upper rotor 30B and the lower rotor 30A are close to each other. Therefore, the magnetic attractive force in the axial direction increases.

  Further, as shown in FIG. 1, the length L1 of the air gap between the upper rotor 30B (upper part) and the stator 40 is set to the length L2 of the air gap between the lower rotor 30A (lower part) and the stator 40. By making the length longer, the lower rotor 30A is attracted to the stator 40 more strongly than the upper rotor 30B. Accordingly, a thrust force acts on the upper rotor 30B and the lower rotor 30A as a resultant force toward the upper side in the axial direction. This thrust force and the gravitational force applied to the movable parts (30A, 30B, 4, 5) including the rotor are at least partially offset, and the thrust force acting on the upper rotor 30B and the lower rotor 30A is canceled or extremely small. By doing so, noise due to thrust force, bearing wear, and bearing sliding loss can be reduced. Further, even when the stator 40 is not energized, there is a difference in the magnetic attractive force acting on each of the rotors 30A and 30B, and the sliding friction between the contact portion between the fixed portion and the movable portion is reduced. The motor 3 can be easily started.

  In addition, without adjusting the length of the air gap of the axial gap type motor 3, the residual magnetic flux density (or maximum energy product) facing the upper air gap of the magnet of the lower rotor is set to the lower side of the magnet of the upper rotor. The residual magnetic flux density (or the maximum energy product) facing the air gap may be larger. As a result, the axial magnetic attractive force between the lower rotor and the stator can be made larger than the axial magnetic attractive force between the upper rotor and the stator.

  Here, the magnetic plate of the stator 40 and the magnetic plate 33 of the upper rotor 30B and the lower rotor 30A are not essential, but the magnetic plate of the stator 40 has not only a role of fixing each magnetic core, but also the upper rotor 30B, lower side. It also plays a role of collecting the magnetic flux of the rotor 30A more widely. In addition to preventing demagnetization, the magnetic plates 33 of the upper rotor 30B and the lower rotor 30A are provided between the magnetic pole centers of d-axis inductance (magnetic poles having different rotor polarities (ie, magnetic poles adjacent to each other in the circumferential direction)). In a shape that provides a difference between the inductance of the magnetic path passing through the back yoke 31) and the q-axis inductance (the boundary between the magnetic poles adjacent to each other in the circumferential direction and the inductance of the magnetic path passing through the back yoke 31), It is also possible to effectively use the reluctance torque.

(Second embodiment)
FIG. 3 is an exploded perspective view of a vertically placed axial gap type motor used in the compressor according to the second embodiment of the present invention. The compressor of the second embodiment has the same configuration as that of the compressor of the second embodiment except for the axial gap type motor, the same components are denoted by the same reference numerals, and the description thereof is omitted. Is used. In the axial gap type motor of the second embodiment, the thickness of the permanent magnet of the rotor is different.

  As shown in FIG. 3, the axial gap type motor according to the second embodiment includes a stator 140, an upper rotor 130 </ b> B disposed on the upper side in the axial direction of the stator 140, and a lower side in the axial direction of the stator 140. The lower rotor 130A is disposed. The upper rotor 130B includes four disk-shaped back yokes 81 made of a magnetic material having a central hole 81a and four fan-shaped arrays arranged along the circumference on the surface side of the back yoke 81 facing the stator 140. A permanent magnet 87 is formed on top of each other. The lower rotor 130A faces the stator 140 of the back yoke 81 on the disk-shaped back yoke 81 made of a magnetic material having a central hole 81a and the surface of the back yoke 81 facing the stator 140. On the surface side, four fan-shaped permanent magnets 82 arranged along the circumference are overlapped. The back yoke 81 is provided with a circular hole 81b in a region facing the space between the permanent magnets 87 arranged in the circumferential direction and in the vicinity of the central hole 81a. The stator 140 is also provided with a circular hole (not shown) in the vicinity of the central hole through which the rotation shaft passes. The space between the permanent magnets 82, the space between the permanent magnets 87, the circular hole 81b of the back yoke 81, and the circular hole of the stator 140 form a gas passage through which refrigerant gas flows in the axial direction.

  Further, the stator 140 has a complicated shape as shown in FIG. 3, but simply, a coil 85 is wound around a plurality of magnetic cores 86 extending in the axial direction (the magnetic core group 84 has Winding). Thereby, one coil constitutes a magnetic pole on the surface of each magnetic core, or two coils cooperate to constitute a magnetic pole. Further, when the V phase and the W phase cooperate, the sum of the currents of the U phase, the V phase, and the W layer is 0, so that a -U phase magnetic pole is formed. Therefore, the magnetic flux generated by the current flowing through the stator also exhibits four magnetic poles. Compared to the case of FIG. 1, the magnetic poles generated on the surface of the magnetic core are not three types of U, V, and W. In addition to U, V, and W, two of these phases cooperate with each other. There are six states, including Thereby, the change of magnetic flux becomes smooth and it has the effect | action which reduces a vibration and noise. This is the same configuration as a so-called 4-pole 12-slot distributed winding.

  There are a total of 12 magnetic cores 86 of the stator 140, but three magnetic cores 86 surrounded by one coil on one side are combined or connected by a mold or the like. Note that 24 magnetic cores 86 may be provided, and the coil may be wound at a magnetic core pitch of 5 by 4 each for the U phase, the V phase, and the W phase. This is the same configuration as a so-called 4-pole 24-slot distributed winding.

  As shown in FIG. 4, by making the thickness L3 of the permanent magnet 82 of the lower rotor 130A thicker than the thickness of the permanent magnet 87 of the upper rotor 130B, the lower rotor 130A has a higher operating point magnetic flux density, Since the magnetic attractive force in the axial direction is increased, the lower rotor 130A is attracted to the stator 140 more strongly than the upper rotor 130B. Accordingly, a thrust force acts on the upper rotor 130B and the lower rotor 130A toward the upper side in the axial direction. This thrust force and the gravitational force acting on the movable parts (130A, 130B, 4, 5) including the rotor are at least partially offset, so that the thrust force can be canceled or extremely reduced to reduce the noise caused by the thrust force. Bearing wear and bearing sliding loss can be reduced. Further, even when no current is supplied to the stator, a difference occurs in the magnetic attractive force acting on each rotor, and sliding friction between the contact portion between the fixed portion and the movable portion is reduced, so that the motor can be easily started.

(Third embodiment)
FIG. 5 shows an exploded perspective view of a vertical axial gap type motor used in the compressor of the third embodiment of the present invention. The compressor of the third embodiment has the same configuration as that of the compressor of the third embodiment except for the axial gap type motor, the same components are given the same reference numerals, and the description thereof is omitted. Is used. The axial gap type motor of the third embodiment differs in the magnetic pole area of the permanent magnet of the rotor.

  As shown in FIG. 5, the vertical axial gap type motor of the third embodiment includes a stator 240, an upper rotor 230 </ b> B arranged on the upper side in the axial direction of the stator 240, and a lower side in the axial direction of the stator 240. And a lower rotor 230A disposed on the side. The upper rotor 230B includes four disk-shaped back yokes 91 made of a magnetic material having a central hole 91a and four fan-shaped arrays arranged along the circumference on the surface of the back yoke 91 facing the stator 240. The permanent magnet 97 is overlapped and formed. The lower rotor 230A has a disk-shaped back yoke 91 made of a magnetic material having a central hole 91a, and a fan shape arranged along the circumference on the surface side of the back yoke 91 facing the stator 240. The four permanent magnets 92 are superimposed on each other. The back yoke 91 is provided with a circular hole 91b in a region facing the space between the permanent magnets 97 arranged in the circumferential direction and in the vicinity of the central hole 91a. The stator 240 is also provided with a circular hole (not shown) in the vicinity of the central hole through which the rotation shaft passes. The space between the permanent magnets 92, the space between the permanent magnets 97, the circular hole 91b of the back yoke 91, and the circular hole of the stator 240 form a gas passage through which the refrigerant gas flows in the axial direction.

  As shown in FIG. 5, the stator 240 has a coil 95 wound around a plurality of magnetic cores 96 extending in the axial direction (winding around the magnetic core group 94).

  As shown in FIG. 6, the circular diameter L5 formed by the four permanent magnets 92 of the lower rotor 230A is made larger than the circular diameter L6 formed by the four permanent magnets 97 of the upper rotor 230B. In this way, the magnetic pole area of the permanent magnet 92 of the lower rotor 230A (lower part) is made larger than the magnetic pole area of the permanent magnet 97 of the upper rotor 230B (upper part), so that the gap between the lower rotor 230A and the stator 240 is increased. Therefore, the lower rotor 230A is more strongly attracted to the stator 240 than the upper rotor 230B. Accordingly, a thrust force acts on the upper rotor 230B and the lower rotor 230A toward the upper side in the axial direction. This thrust force and the gravity of the movable parts (230A, 230B, 4, 5) including the upper rotor 230B and the lower rotor 230A are at least partially offset, thereby canceling or extremely reducing the thrust force, Sounds due to thrust force, bearing wear, and bearing sliding loss can be reduced. Further, even when no current is supplied to the stator, a difference occurs in the magnetic attractive force acting on each rotor, and sliding friction between the contact portion between the fixed portion and the movable portion is reduced, so that the motor can be easily started.

  Since the stator of the longitudinally mounted axial gap type motor used in the compressors of the first to third embodiments shown in FIGS. 1 to 6 can be easily wound and the space factor can be increased, motor efficiency can be easily achieved. Can be improved.

  Further, FIG. 7 shows a perspective view of an axial gap type motor that can be replaced in the longitudinally placed axial gap type motor used in the compressors of the first to third embodiments.

  As shown in FIG. 7, the axial gap motor includes a stator 340, an upper rotor 330 </ b> B disposed on the upper side in the axial direction of the stator 340, and a lower side disposed on the lower side in the axial direction of the stator 340. And a rotor 330A. The upper rotor 330B is formed by overlapping a disc-shaped back yoke 101 made of a magnetic material having a central hole 101a and two substantially semicircular permanent magnets 102 arranged along the circumference. . Similarly, the lower rotor 330A is formed by overlapping the back yoke 101 and the two permanent magnets 102.

  The coil 104 of the stator 340 is wound in a toroidal shape around an annular (ring) magnetic core 103 having a central hole 103a. By passing a current through the coil 104, a magnetic flux is generated in the circumferential direction inside the magnetic core 103. Due to the difference in magnetic flux generated by the current flowing through the adjacent coils 104, magnetic poles are generated between them.

  The stator 340 around which the coil 104 is wound in a toroidal shape may have the same winding as the case of one air gap, even when two air gaps are provided as shown in FIG. Since the circumference can be shortened, it contributes to reducing the amount of copper and winding resistance, and furthermore, since the air gap magnetic flux changes in the circumferential direction and time is smooth, vibration and noise are reduced. It is also possible to reduce.

(Fourth embodiment)
FIG. 8 shows a cross-sectional view of a compressor equipped with an axial gap motor according to a fourth embodiment of the present invention. The compressor according to the fourth embodiment has the same configuration as that of the compressor according to the first embodiment except for the axial gap type motor, and FIG. Incorporate. In the axial gap type motor of the fourth embodiment, the ampere turns of the two stators are different.

  As shown in FIG. 8, the axial gap type motor includes a rotor 50, an upper stator 60 </ b> B disposed on the upper side in the axial direction of the rotor 50, and a lower stator disposed on the lower side in the axial direction of the rotor 50. 60A. The rotor 50 is formed by superposing the permanent magnets 32 shown in FIG. 2 so as to be sandwiched between the magnetic plates 33 from both axial sides of the permanent magnets 32.

  FIG. 9 is a perspective view of the lower stator 60A. The upper stator 60B has the same configuration as the lower stator 60A (upside down).

  As shown in FIG. 9, the lower stator 60A includes a disk-shaped magnetic plate 61 having a central hole 61a, a substrate 63 made of a magnetic body having a central hole 63a, and a circumferential surface on the substrate 63. And a coil 62 wound around six magnetic cores 64 which are erected. On the other hand, the upper stator 60B has the same configuration as the lower stator 60A except that the coil 62 and the magnetic core 64 are thin. The magnetic plates 61 of the upper stator 60B and the lower stator 60A are radially provided with slits 61b for magnetically insulating the plurality of magnetic cores 64 from each other.

  In the upper stator 60B and the lower stator 60A, an axial coil is directly wound around the magnetic core 64 extending in the axial direction. The six magnetic cores 64 are magnetically connected to each other by a substrate 63, and are connected by a magnetic body 61 on the side opposite to the substrate 63 (side facing the rotor). The coil 62 is, for example, a three-phase star connection and supplies current from an inverter.

  A coil 62 is wound around the positions of the upper stator 60B and the lower stator 60A facing the rotor 50 so that opposite polarities are generated. That is, a coil wound in the same direction as viewed from one axial direction is provided.

  In addition, the upper stator 60B increases the ampere turn compared to the lower stator 60A. For example, the number of turns is changed with the same wire diameter. In FIG. 8, the coil thickness L8 of the upper stator 60B (upper part) is thicker than the coil thickness L7 of the lower stator 60A (lower part).

  In this case, for example, if the same-phase coils 62 of the lower stator 60A and the upper stator 60B are connected in series, the current is the same and the number of turns is different, so the ampere turn of the upper stator 60B becomes larger, and the rotor 50 Strongly sucked by 60B. Accordingly, a thrust force acts on the rotor 50 toward the upper side in the axial direction. The thrust force and the gravity acting on the movable parts (50, 4, 5) including the rotor are at least partially offset, so that the thrust force is canceled or made extremely small, so that the sound caused by the thrust force and the wear of the bearing The sliding loss of the bearing can be reduced. In addition, since no difference in magnetic attraction force is generated in the rotor when no current is supplied to the stator, the sliding friction between the contact portion between the fixed portion and the movable portion increases, so that reverse rotation when the motor is stopped can be prevented. Therefore, this axial gap type motor is suitable for a motor mounted on a compressor or a fan. Of the windings of the upper stator 60B and the lower stator 60A, when the same-phase windings are connected in parallel, the current value will be different if the wire diameter is different with the same number of turns. Is possible. In any of the above methods, one inverter may be used to drive the motor.

  Here, increasing the ampere turn means that, for example, when two stators are operated by one inverter, the winding resistance is reduced when two stator windings are fed in parallel, or 2 There are means such as increasing the number of windings when the windings of two stators are fed in series. Further, if the two stators are separately controlled by independent inverters, the current may be increased, and the operation can be performed with an optimum ampere-turn difference depending on the operation conditions.

  In the axial gap motor, the magnetic fluxes of the upper stator 60B and the lower stator 60A are linked on both surfaces of the permanent magnet of the rotor 50, so that the torque is improved.

  In the air gap between the rotor 50 and the upper stator 60B and the air gap between the rotor 50 and the lower stator 60A, the magnetic plates of the rotor 50 and the magnetic plates 61 of the upper stator 60B and the lower stator 60A are close to each other. Therefore, the magnetic attractive force in the axial direction increases.

  Other operations are the same as those of the axial gap type motor used in the compressor of the first embodiment.

  In addition, in the axial gap type motor in which two stators are arranged on both sides in the axial direction of the rotor, such as the axial gap type motor used in the compressor of the fourth embodiment, between the rotor and the upper stator. The length of the air gap is made shorter than the length of the air gap between the rotor and the lower stator, or the thickness of the magnet close to the stator at the top of the rotor is set to the thickness of the magnet close to the stator at the bottom of the rotor. The magnetic pole area facing the upper air gap of the upper magnet of the rotor may be larger than the magnetic pole area facing the lower air gap of the lower magnet of the rotor, The residual magnetic flux density (or maximum energy product) facing the air gap at the top of the magnet is changed to the residual magnetic flux facing the air gap at the bottom of the lower magnet Degrees may be or greater than (or maximum energy product). Accordingly, the axial magnetic attractive force between the rotor and the upper stator can be made larger than the axial magnetic attractive force between the rotor and the lower stator.

  FIG. 10 is an exploded perspective view of a rotor 70 having another configuration example. As shown in FIG. 10, the rotor 70 has two fan-shaped permanent magnets 72 along the circumference on one side in the axial direction of a disk-shaped back yoke 73 made of a magnetic material having a central hole 73a. Two fan-shaped permanent magnets 72 are arranged along the circumference on the other side of the back yoke 73 in the axial direction. The permanent magnets 72 on both sides of the back yoke 73 are arranged at opposing positions. On both sides of the back yoke 73, a magnetic body 74 is provided in a region between two permanent magnets 72 arranged in the circumferential direction. The back yoke 73, the permanent magnet 72, and the magnetic plate 71 are overlapped with each other by being sandwiched by disk-shaped magnetic plates 71 having a central hole 71a from both sides in the axial direction of the back yoke 73 on which the permanent magnets 72 are arranged. The magnetic plate 71 is provided with four slits 71b radially, and permanent magnets 72 and magnetic bodies 74 are alternately arranged between the slits 71b.

  In the configuration of the rotor 70, the permanent magnet 72 can be easily fixed, and the rotor 70 can be easily held on the rotating shaft. It is also possible to provide a skew effect by shifting the magnetic pole distribution on both sides of the rotor 70. The magnetic poles of the permanent magnets 72 on both sides in the axial direction of the back yoke 73 may be the same or opposite, but the arrangement of the stator coils differs depending on which of the magnetic poles. When the magnetic poles on both sides are the same, the thickness of the back yoke 73 is important, but in the opposite case, it is sufficient for the back yoke 73 to pass a magnetic flux only in the axial direction. Further, in the rotor 70, since the magnet acting on the upper stator and the magnet acting on the lower stator are independent, the means for generating the axial force has the magnet thickness, magnetic pole area, maximum energy product, etc. It can be changed. In this case, the same magnetic pole of the permanent magnets on both sides is more effective, but the magnetic poles of the permanent magnets on both sides may be opposite.

(Fifth embodiment)
FIG. 11 shows a side view of a longitudinally mounted axial gap type motor used in the compressor of the fifth embodiment of the present invention. In the axial gap type motor of the fifth embodiment, the magnetic resistances of the two stators are different.

  As shown in FIG. 11, the back yoke thickness L10 of the upper stator 160B is larger than the back yoke thickness L9 of the lower stator 160A. Furthermore, if the back yoke of the lower stator 160A has a thickness that easily generates magnetic saturation, the magnetic flux that appears on the surface of the lower stator 160A is reduced as a result, so that the rotor 150 is stronger than the upper stator 160B. Sucked.

  In the axial gap type motor of this fifth embodiment, it is only necessary to change the thickness of the stator back yoke, and this can be realized by thinning and saturation of the stator back yoke on the side where the magnetic attractive force in the axial direction is desired to be weakened. In this case, the material used can be reduced, the weight can be reduced, and the overall length can be shortened.

(Sixth embodiment)
FIG. 12 shows a cross-sectional view of a compressor equipped with a longitudinally mounted axial gap type motor according to a sixth embodiment of the present invention. This compressor is a low-pressure dome type, and includes two rotors of the axial gap type motor. Magnet thickness is different.

  As shown in FIG. 12, the compressor equipped with the axial gap type motor of the sixth embodiment includes a sealed container 201, a compression mechanism unit 202 disposed in the sealed container 201, An axial gap type motor 203 is disposed below the compression mechanism unit 202 and drives the compression mechanism unit 202 via the rotation shaft 204.

  The axial gap motor 203 is disposed in a low-pressure space on the suction side of the compression mechanism 202 in the sealed container 201. This compressor is a so-called low-pressure dome type.

  The axial gap type motor 203 includes a stator 240, and an upper rotor 230B and a lower rotor 230A that are disposed on both sides of the stator 240 in the axial direction. The upper rotor 230 </ b> B and the lower rotor 230 </ b> A are externally fitted and fixed to the rotation shaft 204, and the rotational force of the upper rotor 230 </ b> B and the lower rotor 230 </ b> A is transmitted to the compression mechanism unit 202 via the rotation shaft 204.

  Further, the compression mechanism unit 202 includes a main body unit 220 attached in the sealed container 201, a fixed scroll 224 fixed to the main body unit 220, and a turning scroll 223 that meshes with the fixed scroll 224. The fixed scroll 224 and the orbiting scroll 223 each have a whirling wrap erected on the end plate, and the fixed scroll 224 and the orbiting scroll 223 mesh with each other to form a plurality of compression chambers 225. The orbiting scroll 223 is connected to the upper end of the rotating shaft 204 of the axial gap type motor 203 and is turned by the rotation of the rotating shaft 204.

  The main body 220 rotatably supports the upper end side of the inserted rotating shaft 204. A holding portion 205 that rotatably supports the lower end side of the rotating shaft 204 is provided in the sealed container 201 and below the axial gap type motor 203.

  The main body 220 has a suction hole 221 that communicates the lower low-pressure space and the compression chamber 225, and the fixed scroll 224 has a discharge hole 226 that communicates the upper high-pressure space and the compression chamber 225. .

  A suction pipe 211 is connected to the lower side surface of the sealed container 201 in the vicinity of the lower rotor 230B of the axial gap motor 203, and a discharge pipe 212 is connected to the upper part of the sealed container 201.

  In the compressor having the above-described configuration, when the compression mechanism unit 202 is driven by the axial gap type motor 203 via the rotating shaft 204, the refrigerant gas supplied from the suction pipe 211 cools the axial gap type motor 203 while being in the axial gap type. The refrigerant gas that passes through the air gap of the motor 203 and a gas passage (not shown) provided in the axial direction and is supplied through the suction hole 221 is compressed by the compression mechanism 202. The refrigerant gas thus compressed is discharged from the discharge hole 226 of the compression mechanism unit 202 into the upper space, and is discharged to the outside of the sealed container 201 through the discharge pipe 212.

  At this time, gravity acts on the movable parts (230A, 230B, 204) including the two rotors in the upper rotor 230B and the lower rotor 230A.

  In the axial gap type motor 203, as in the axial gap type motor shown in FIG. 3, the thickness L11 of the permanent magnet of the lower rotor 230A is made larger than the thickness L12 of the permanent magnet of the upper rotor 230B. As a result, the lower rotor 230A is attracted to the stator 240 more strongly than the upper rotor 230B. Accordingly, a thrust force acts on the upper rotor 230B and the lower rotor 230A toward the upper side in the axial direction. This thrust force and the gravitational force of the movable parts (230A, 230B, 204) including the rotor are at least partially offset, so that the thrust force is canceled or made extremely small, so that the sound caused by the thrust force and the wear of the bearing, The sliding loss of the bearing can be reduced. Further, even when no current is supplied to the stator, a difference occurs in the magnetic attractive force acting on each rotor, and sliding friction between the contact portion between the fixed portion and the movable portion is reduced, so that the motor can be easily started.

  Moreover, in the said 1st-6th embodiment, although the permanent magnet was used for the axial gap type motor, another magnet may be sufficient. However, it is preferable to use a permanent magnet because the magnetic flux density is increased, the output is improved, and the efficiency is improved.

  Note that the configurations of the stator and the rotor of the axial gap type motor of the present invention are not limited to the first to sixth embodiments. In addition, the axial gap type motor of the present invention may have a radial gap, for example. That is, it is only necessary to have at least two axial gaps that can easily cancel the force acting in the axial direction.

  Further, according to the present invention, in the axial gap type motor in which the rotors are respectively disposed on both sides in the axial direction of the stator, the length of the air gap between the lower rotor and the stator is set between the upper rotor and the stator. A configuration in which the length of the air gap is shorter than the length of the air gap, a configuration in which the thickness of the magnet adjacent to the stator of the lower rotor is thicker than a thickness of the magnet in proximity to the stator of the upper rotor, and the air above the magnet of the lower rotor A configuration in which the magnetic pole area facing the gap is wider than the magnetic pole area facing the lower air gap of the upper rotor magnet, and the residual magnetic flux density (or maximum energy product) facing the upper side of the lower rotor magnet is Can be combined among the configurations that make it larger than the residual magnetic flux density (or maximum energy product) facing the lower air gap of the upper rotor magnet Two or more possible configurations may be applied as appropriate.

  Similarly, in an axial gap type motor in which stators are arranged on both sides in the axial direction of the rotor, the length of the air gap between the rotor and the upper stator is set as the length of the air gap between the rotor and the lower stator. A configuration that is shorter than the length, a configuration in which the thickness of the magnet close to the stator at the top of the rotor is greater than a thickness of the magnet that is close to the stator at the bottom of the rotor, and the air gap above the magnet at the top of the rotor The magnetic pole area to be made larger than the magnetic pole area facing the lower air gap of the lower magnet of the rotor, and the residual magnetic flux density (or maximum energy product) facing the upper air gap of the upper magnet of the rotor A configuration in which the residual magnetic flux density (or maximum energy product) facing the lower air gap of the lower magnet of the rotor is larger than that of the upper stator Of the configuration in which the ampere turn is larger than the ampere turn of the lower stator and the configuration in which the magnetic resistance of the lower stator is larger than the magnetic resistance of the upper stator, two or more combinations that can be combined are applied as appropriate. May be.

  In the first to sixth embodiments, the compressor equipped with the vertical axial gap type motor has been described. However, the axial gap type motor of the present invention is not limited to the compressor, and is driven by the axial gap type motor. The present invention can be applied to a device having a mechanism.

  Moreover, in the said 1st-6th embodiment, although the rotary compressor and the scroll compressor were demonstrated, the compressor using the axial gap type motor of this invention was equipped with other compression mechanisms not only in this. It may be a compressor.

FIG. 1 is a cross-sectional view of a compressor equipped with a vertical axial gap type motor according to a first embodiment of the present invention. FIG. 2 is a perspective view of the rotor of the axial gap motor. FIG. 3 is an exploded perspective view of a rotor and a stator of an axial gap type motor used in the compressor according to the second embodiment of the present invention. FIG. 4 is a side view of the stator of the axial gap motor. FIG. 5 is an exploded perspective view of a rotor and a stator of an axial gap type motor used in the compressor according to the third embodiment of the present invention. FIG. 6 is a side view of the stator of the axial gap motor. FIG. 7 is a perspective view of a replaceable axial gap motor. FIG. 8 is a sectional view of a compressor equipped with an axial gap motor according to a fourth embodiment of the present invention. FIG. 9 is a perspective view of the stator of the axial gap motor. FIG. 10 is an exploded perspective view showing another rotor. FIG. 11 is a side view of a stator of an axial gap type motor used in the compressor according to the fifth embodiment of the present invention. FIG. 12 is a sectional view of a compressor equipped with an axial gap motor according to the sixth embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Sealed container 2 ... Compression mechanism part 3 ... Axial gap type motor 4 ... Rotating shaft 5 ... Crank pin 6 ... Roller 7 ... Compression chamber 8 ... Upper end plate 9 ... Lower end plate 11 ... Intake pipe 12 ... Discharge pipe 20 ... Main body part DESCRIPTION OF SYMBOLS 21,22 ... Bearing 23 ... Discharge port 30B ... Upper rotor 30A ... Lower rotor 31 ... Back yoke 32 ... Permanent magnet 33 ... Magnetic plate 33b ... Slit 31b ... Circular hole 40 ... Stator 50 ... Rotor 60A ... Lower stator 60B ... Upper stator 61 ... magnetic plate 61b ... slit 62 ... coil 63 ... substrate 64 ... magnetic core 70 ... rotor 71 ... magnetic plate 71a ... center hole 71b ... slit 72 ... permanent magnet 73 ... back yoke 73a ... center hole 74 ... magnetic body 74
81 ... Back yoke 81a ... Central hole 81b ... Round hole
82 ... Permanent magnet 84 ... Magnetic core group 85 ... Coil 86 ... Magnetic core 87 ... Permanent magnet 91 ... Back yoke 92 ... Permanent magnet 94 ... Magnetic core group 95 ... Coil 96 ... Magnetic core 97 ... Permanent magnet 101 ... Back yoke 102 ... Permanent magnet 103 ... Magnetic core 104 ... Coil
DESCRIPTION OF SYMBOLS 140 ... Stator 130A ... Lower rotor 130B ... Upper rotor 240 ... Stator 230A ... Lower rotor 230B ... Upper rotor 340 ... Stator 330A ... Lower rotor 330B ... Upper rotor 403 ... Axial gap type motor

Claims (16)

An axial gap type motor (3, 203, 403) arranged vertically,
A stator (40, 60A, 60B, 140, 240, 340) in which a coil is wound around a magnetic material;
A rotor (30A, 30B, 50, 70, 130A, 130B) fixed to the rotating shaft (4, 204) and disposed at a position facing the stator (40, 60A, 60B, 140, 240, 340) in the axial direction. 230A, 230B, 330A, 330B)
The axial magnetic force between the stator (40, 60A, 60B, 140, 240, 340) and the rotor (30A, 30B, 50, 70, 130A, 130B, 230A, 230B, 330A, 330B) is An axial gap motor characterized in that at least a part thereof is canceled by gravity of a movable part including the rotor (30A, 30B, 50, 70, 130A, 130B, 230A, 230B, 330A, 330B). The axial gap type motor according to claim 1,
The rotors (30A, 30B, 130A, 130B, 230A, 230B, 330A, 330B) are arranged on both sides of the stator (40, 140, 240, 340) in the axial direction,
The magnetic attraction force in the axial direction between the lower rotor (30A, 130A, 230A, 330A) and the stator (40, 140, 240, 340) is the upper rotor (30B, 130B, 230B, 330B). An axial gap type motor characterized by being larger than the magnetic attractive force in the axial direction between the stator and the stator (40, 140, 240, 340). In the axial gap type motor according to claim 2,
The length of the air gap between the lower rotor (30A) and the stator (40) is shorter than the length of the air gap between the upper rotor (30B) and the stator (40). An axial gap type motor characterized by that. In the axial gap type motor according to claim 2,
The lower rotor (130A) and the upper rotor (130B) have magnets (82, 87), respectively.
An axial gap type motor characterized in that the magnet (82) of the lower rotor (130A) is thicker than the magnet (87) of the upper rotor (130B). In the axial gap type motor according to claim 2,
The lower rotor (230A) and the upper rotor (230B) have magnets (92, 97), respectively.
The magnetic pole area facing the air gap of the magnet (92) of the lower rotor (230A) is wider than the magnetic pole area facing the air gap of the magnet (97) of the upper rotor (230B). Axial gap type motor. In the axial gap type motor according to claim 2,
The upper rotor and the lower rotor have magnets respectively.
The residual magnetic flux density or maximum energy product facing the air gap of the lower rotor magnet is larger than the residual magnetic flux density or maximum energy product facing the air gap of the upper rotor magnet. Axial gap type motor. The axial gap type motor according to claim 1,
The stators (60A, 60B, 160A, 160B) are respectively arranged on both sides of the rotor (50, 70, 150) in the axial direction,
An axial magnetic attractive force between the rotor (50, 70, 150) and the upper stator (60B, 160B) causes the rotor (50, 70, 150) and the lower stator (60A, 160A). An axial gap type motor characterized by being larger than an axial magnetic attractive force between the two. In the axial gap type motor according to claim 7,
The rotor (50, 70, 150) has an axial gap type motor having magnets close to the upper stator (60B, 160B) and the lower stator (60A, 160A). In the axial gap type motor according to claim 7,
The rotor (70) includes a magnetic plate (74) and magnets (72) fixed to both sides of the magnetic plate (74) in the axial direction.
An axial gap in which the upper magnet (72) of the rotor (70) is close to the upper stator, while the lower magnet (72) of the rotor (70) is close to the lower stator. Type motor. In the axial gap type motor according to claim 7,
An axial gap type motor, wherein a length of the air gap between the rotor and the upper stator is shorter than a length of the air gap between the rotor and the lower stator. In the axial gap type motor according to claim 7,
The rotor has a magnetic plate and magnets fixed on both sides in the axial direction of the magnetic plate,
An axial gap type motor characterized in that the magnet on the upper side of the rotor is thicker than the magnet on the lower side of the rotor. In the axial gap type motor according to claim 7,
The rotor has a magnetic plate and magnets fixed on both sides in the axial direction of the magnetic plate,
An axial gap type motor characterized in that a magnetic pole area facing the air gap of the magnet on the upper side of the rotor is larger than a magnetic pole area facing the air gap of the magnet on the lower side of the rotor. In the axial gap type motor according to claim 7,
The rotor has a magnetic plate and magnets fixed on both sides in the axial direction of the magnetic plate,
The residual magnetic flux density or maximum energy product facing the air gap of the magnet on the upper side of the rotor is greater than the residual magnetic flux density or maximum energy product facing the air gap of the magnet on the lower side of the rotor. A characteristic axial gap type motor. In the axial gap type motor according to claim 7,
An axial gap type motor characterized in that an ampere turn of the upper stator (60B) is larger than an ampere turn of the lower stator (60A). In the axial gap type motor according to claim 7,
An axial gap type motor characterized in that a magnetic resistance of the lower stator (160A) is larger than a magnetic resistance of the upper stator (160B). The axial gap type motor according to any one of claims 1 to 15,
A compressor characterized in that the axial gap type motor (3, 203, 403) is mounted.

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