JP2006325315A - Fan motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ensure a waterproof property of a terminal, and reduce a cost of a terminal waterproofing structure. <P>SOLUTION: In a fan motor 1 with an axial gap type motor, waterproofing gaskets 36, 38 are disposed between a circuit case 22 and a center piece 7, and collectively waterproof a plurality of the terminals 29. Even if water droplets enter into the motor, the waterproofing gaskets 36, 38 can collectively waterproof a plurality of the terminals 29. The cost of the terminal waterproofing structure can be reduced in comparison with the structure for individually waterproofing a plurality of the terminals 29 since the terminal waterproofing structure can be simplified. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fan motor, and more particularly to a fan motor having a structure for cooling the inside of the motor.

  2. Description of the Related Art Conventionally, fan motors used for automobile engine cooling and the like are disposed in an engine room that is exposed to radiant heat from the engine. For this reason, in this type of fan motor, consideration is given to the cooling structure of the fan motor itself (see, for example, Patent Document 1).

  For example, in the example described in Patent Document 1, a plurality of fan blades (air blowing blades) are provided on the outer peripheral wall of a cylindrical fan boss that covers the front end portion of the motor case, and cooling blades are provided on the inner bottom surface of the fan boss. Is provided. In addition, an air intake port for sucking air and a discharge port for discharging air are provided in front and rear positions in the axial direction of the fan motor.

  Then, by rotating the cooling blade along with the rotation of the fan boss, air is sucked into the motor from the intake port, and after the air is circulated inside the motor, the air inside the motor is discharged from the discharge port. The members inside are efficiently cooled.

  By the way, in the technical field of fan motors equipped with this type of fan boss, an axial gap type brushless fan motor in which the rotor and the stator are arranged to face each other in the axial direction in order to reduce the axial size. Has been devised. As for this axial gap type brushless fan motor, there is an attempt to cool the members inside the motor by circulating air inside the motor.

  Here, the fan motor used for engine cooling of a motor vehicle is arrange | positioned in a to-be-watered environment. For this reason, when adopting a structure in which air is circulated inside the motor and the members inside the motor are cooled in this type of fan motor, it is necessary to waterproof a terminal connecting the stator coil and the drive circuit.

  And as this kind of terminal waterproof structure, there exist the following (for example, refer patent document 2, 3). For example, in the example described in Patent Document 2, a connection terminal that connects each stator coil and the drive circuit is press-fitted and fixed in a sealed state into a terminal insertion hole provided in a disk portion of the upper holder.

In the example described in Patent Document 3, the drive circuit is electrically connected to the winding by a terminal pin, and this terminal pin is sealed in a through hole formed in the flange portion of the housing with a seal member. It penetrates.
No. 7-47971 Publication 5-18275 JP 2000-350430 A

  However, when an axial gap type motor is used as a fan motor disposed in a wet environment, the drive circuit is not a separate unit from the fan motor, and the circuit integrated structure in which the drive circuit is integrally provided in the stator It becomes. For this reason, it is necessary to ensure waterproofing of the terminal. At this time, since the terminal is generally thin and thin, waterproofing each terminal as in the examples described in Patent Documents 2 and 3 increases the cost of the terminal waterproof structure.

  In addition, when a structure in which air is circulated inside the motor to cool the members inside the motor is used, it is necessary to prevent water droplets from entering the bearing that supports the rotating shaft.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a fan motor capable of reducing the cost of the terminal waterproof structure while ensuring the waterproof property of the terminal.

  Another object of the present invention is to provide a fan motor that can prevent water droplets from entering a bearing that supports a rotating shaft.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a rotor configured to have a rotating shaft, and is arranged so as to be opposed to the rotor in the axial direction with an air gap therebetween. A stator having a plurality of stator coils around an axis, a stator provided integrally or separately on the rotating shaft of the stator, and a bearing for supporting the rotating shaft. A center piece, a circuit case disposed on the opposite side of the rotor in the axial direction of the stator, a plurality of terminals having one end connected to the stator coil and the other end protruding into the circuit case, and the circuit case A drive circuit disposed within and electrically connected to the stator coil via the plurality of terminals; and the rotor fixed coaxially with the rotor; A fan boss configured to be physically rotated with a bottomed cylindrical member, housing the rotor and the stator inside the bottomed cylindrical member, and integrally provided on a cylindrical outer surface of the fan boss; Fan blades that form an air flow in the direction of the rotation axis in accordance with rotation of the fan motor, wherein the plurality of terminals are collectively provided between the circuit case and the center piece or the stator. A sealing member for waterproofing is arranged.

  Thus, in the invention according to claim 1, between the circuit case and the center piece or the stator, the sealing member that collectively waterproofes the plurality of terminals is disposed on the radially outer side of the plurality of terminals. . Therefore, for example, by adopting a structure in which air is circulated inside the motor to cool the members inside the motor, even if water droplets enter the inside of the motor, the plurality of terminals can be collectively waterproofed by the seal member. Thereby, since the terminal waterproof structure can be simplified as compared with the structure for waterproofing each of the plurality of terminals, the cost of the terminal waterproof structure can be reduced.

  Further, in the invention according to claim 2, an annular waterproof ring that extends integrally with or separately from the rotor to the stator side is provided on the outer side in the radial direction of the bearing around the rotation shaft of the rotor. A flange that constitutes a labyrinth structure that extends radially outward and whose extension end is located inside the waterproof ring and prevents the bearing from getting wet with the waterproof ring is provided. Therefore, for example, by adopting a structure in which air is circulated inside the motor to cool the members inside the motor, even if water drops enter the motor, the labyrinth structure constituted by the waterproof ring and the flange allows the bearing to be exposed to water. Can be prevented.

  Furthermore, in the invention according to claim 3, the seal member is constituted by an annular waterproof packing. Therefore, even if water droplets enter the motor, the plurality of terminals can be reliably waterproofed collectively by the seal member.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. It should be noted that members, arrangements, and the like described below do not limit the present invention, and it goes without saying that various modifications can be made in accordance with the spirit of the present invention.

  First, the configuration of a fan motor according to an embodiment of the present invention will be described.

  In the fan motor 1 according to an embodiment of the present invention, the fan boss 2 is formed of a bottomed cylindrical member that accommodates motor components described later. The fan blade 3 that forms the air flow F in the direction of the rotation axis is integrally formed with the rotation 2.

  As the fan blade 3 rotates, the upstream side of the fan blade 3 is in a negative pressure state and the downstream side is in a positive pressure state, and an air flow F is formed as shown in FIG. Yes. Further, a fan boss hole 4 is provided in the negative pressure side portion of the cylindrical outer peripheral portion 2 a of the fan boss 2 as a vent hole that communicates the inside and outside of the fan boss 2.

  The fan boss hole 4 is formed at a position aligned with an outer peripheral side opening 11b of a ventilation groove 11 of the rotor yoke 9 described later. In this example, eight fan boss holes 4 are provided at predetermined intervals in the circumferential direction on the cylindrical outer peripheral portion 2 a of the fan boss 2.

  With this configuration, in this example, the air discharged from the ventilation groove 11 in the outer circumferential direction in accordance with the rotation of the rotor yoke 9 is adjusted by the fan boss 2 through the fan boss hole 4 at a position where the air is aligned with the outer circumferential side opening 11 b of the ventilation groove 11. It is possible to efficiently discharge to the outside with low loss. Further, in this example, the fan boss hole 4 formed in the fan boss 2 is formed with a minimum hole size necessary for exposing the outer peripheral side opening 11b of the ventilation groove 11 so that foreign matter does not enter. Yes.

  In this embodiment, a so-called axial gap / fixed yoke type motor in which the rotor 8 and the stator 13 face each other in the axial direction is employed as the motor housed inside the fan boss 2.

  The motor components of the fan motor 1 according to the present embodiment are a rotor 8, a stator 13, a center piece 7, a heat sink member 19, a circuit case 22, and a drive circuit 28. The rotor 8 is disposed so as to face the stator 13 in the axial direction with the air gap 12 therebetween, and is repelled by the magnetic field generated from the stator 13 and rotates around the rotation axis. And a rotor magnet 10.

  A disk-shaped part 9a formed on the rotor yoke 9 is fixed to the cylindrical bottom surface part 2b of the fan boss 2 by screws or the like (not shown), and the disk-shaped part 9a of the rotor yoke 9 is rotated in an orthogonal direction. One end of the shaft 5 is fixed. The rotating shaft 5 is rotatably supported by a cylindrical center piece 7 (holder) via bearings 6a and 6b. As a result, the fan boss 2 and the rotor 8 can rotate integrally.

  The disc-like portion 9a of the rotor yoke 9 is formed with a plurality of (e.g., eight) protrusions 9b that protrude to the opposite side of the stator 13 and extend radially from the inner side to the outer side. The protrusion 9b is formed by, for example, pressing the rotor yoke 9. And the ventilation groove | channel 11 is formed in the stator 13 side of the disk-shaped part 9a along the protruding part 9b by forming the protruding part 9b in the disk-shaped part 9a.

  The inner side in the radial direction of the ventilation groove 11 is formed as a rotation center side opening 11a that opens into a rotation center side space 24 formed around the rotation axis of the rotation shaft 5 inside the hole portion of the rotor magnet 10. The outer side in the radial direction of the groove 11 is formed as an outer peripheral side opening 11 b that opens into the fan boss hole 4 of the fan boss 2. In addition, in this example, although the cross-sectional shape of the ventilation groove | channel 11 is made into semicircle shape, any shape other than this, such as a rectangle and a triangle, may be sufficient.

  An annular waterproof ring 14 extending toward the stator 13 is provided on the outer side in the radial direction of the bearing 6a around the rotary shaft 5 in the disk-shaped portion 9a formed in the rotor yoke 9. The waterproof ring 14 is formed integrally with the rotor yoke 9 and is formed, for example, by pressing the rotor yoke 9. The waterproof ring 14 may be configured separately from the rotor yoke 9.

  The rotor magnet 10 is formed in an annular shape, and is disposed on the plane formed on the stator 13 side of the disk-shaped portion 9a so as to be coaxial with the rotary shaft 5. The rotor magnet 10 of this example is configured to cover a region from the groove longitudinal direction intermediate portion of the ventilation groove 11 to the outer peripheral side opening 11b of the ventilation groove 11 from the stator 13 side.

  The stator 13 is composed of a disk-shaped member fixed to the center piece 7. The center piece 7 and the stator 13 may be separate or integrally formed. The stator 13 of this example includes a stator core 26, and a stator coil 27 is wound around each salient pole 26 a formed on the stator core 26.

  The stator 13 is provided with a plurality of communication passages 17 in the rotation axis direction around the center piece 7. The communication passage 17 communicates the air passage 21 and the rotation center side space 24. The radial distance of the annular gap 16 between the outer peripheral surface of the stator 13 and the inner peripheral surface of the fan boss 2 is set so that the airflow resistance is larger than the airflow resistance in the communication path 17. Has been.

  An annular heat sink member 19 is provided on the opposite side of the stator 13 from the rotor magnet 10. An air passage 21 is provided between the heat sink member 19 and the stator 13, and a plurality of protrusions 20 protrude from the heat sink member 19 in the air passage 21.

  As a result, the air flowing through the air passage 21 exchanges heat with the protrusions 20 so that the heat sink member 19 can be air-cooled. In the present embodiment, the length of the fan boss 2 in the rotation axis direction is set so that the opening of the fan boss 2 is positioned in the vicinity of the heat sink member 19.

  An annular circumferential gap 25 is provided between the outer peripheral surface of the heat sink member 19 and the inner peripheral surface of the fan boss 2. The circumferential gap 25 is opened downstream of the air flow F of the fan motor 1, that is, on the positive pressure side, and serves as a positive pressure side vent of the fan motor 1.

  A circuit case 22 is arranged on the opposite side of the heat sink member 19 from the stator 13. The circuit case 22 is fixed to the center piece 7 with screws 34 (three places in total), and a drive circuit 28 is disposed in the circuit case 22. In this example, the circuit case 22 and the drive circuit 28 are also cooled by the heat sink member 19.

  The terminal 29 is molded in the center piece 7, and one end of the terminal 29 is electrically connected to the stator coil 27. In the present embodiment, three terminals 29 are provided around the rotation axis. As shown in FIG. 2, a terminal 29 protrudes concentrically on the end face of the center piece 7 on the circuit case 22 side, and screw holes 35 are formed between the circumferential directions of the terminal 29. In this example, the screw holes 35 and the terminals 29 are arranged on the same circumference at a 60 ° pitch.

  The other end of the terminal 29 protrudes into the circuit case 22 and is electrically connected to the drive circuit 28 as shown in FIG. Then, a current is supplied from the drive circuit 28 to the stator coil 27 via the terminal 29, whereby a magnetic field is generated from the stator coil 27 to the rotor magnet 10 side.

  Here, in the present embodiment, whether the water droplet intrusion path to the plurality of terminals 29 passes through the air gap 12 between the rotor 8 and the stator 13 or through the gap between the stator 13 and the circuit case 22. Either. Then, it is conceivable that one of these routes is traced and finally combined into one, and water drops enter a plurality of terminals 29 through between the center piece 7 and the circuit case 22.

  Therefore, in this embodiment, a terminal waterproof structure is provided between the center piece 7 and the circuit case 22. That is, seal member accommodating portions 30 and 32 are formed concentrically on the end surface of the center piece 7 on the circuit case 22 side. The seal member accommodating portion 30 is formed at a radially outer position of the screw hole 35 and the terminal 29, and the seal member accommodating portion 32 is disposed at a radially inner position of the screw hole 35 and the terminal 29 and at a radially outer position of the bearing 6b. Is formed.

  And the waterproof packings 36 and 38 as a sealing member are accommodated in the sealing member accommodating parts 30 and 32, respectively. In this example, the waterproof packings 36 and 38 are in close contact with the circuit case 22 and the center piece 7 by fixing the circuit case 22 to the center piece 7 using screws 34.

  The waterproof packings 36, 38 are in close contact with the circuit case 22 and the center piece 7 to collectively waterproof the plurality of terminals 29 and screws 34. In this example, the waterproof packings 36 and 38 are used as the seal member, but an O-ring may be used.

  Further, in this example, a flange 15 extending outward in the radial direction is provided at the end of the center piece 7 on the rotor 8 side. The extending end of the flange 15 is located inside the waterproof ring 14. The flange 15 constitutes a labyrinth structure that prevents the bearing 6a from getting wet with the waterproof ring 14.

  Next, the effect of the fan motor according to the embodiment of the present invention will be described.

  When electric energy is applied to the fan motor 1 from the outside and a magnetic field is generated in the stator 13, the rotor 8 rotates against the magnetic field. As a result, the fan boss 2 and the fan blade 3 rotate together with the rotor 8, and an air flow F is formed in the direction of the rotation axis of the fan motor 1.

  When the rotor 8 rotates around the rotation axis, the air in the ventilation groove 11 formed in the rotor yoke 9 moves from the rotation center side opening 11a to the outer periphery side opening 11b by the centrifugal force due to the rotation of the rotor 8, and this It is pushed out of the fan boss 2 through the fan boss hole 4 of the fan boss 2 from the outer peripheral side opening 11b.

  That is, the ventilation groove 11 formed in the rotor yoke 9 serves as a pump that pumps air from the radially inner side to the outer side. Moreover, since it is a pump structure in which a groove is simply provided in the plane of the disk-like portion 9a provided in the rotor yoke 9, there is no need to provide an extra space such as providing a cooling blade as in the prior art. Furthermore, the air resistance against the rotation of the rotor yoke 9 can be reduced.

  In this example, the air in the ventilation groove 11 is discharged to the outside of the fan boss 2 as described above, whereby the pressure in the rotation center side space 24 where the rotation center side opening 11a of the ventilation groove 11 opens is increased. Lower. For this reason, air is sucked in from the upstream air passage 21 and the circumferential gap 25 through the communication passage 17 of the stator 13 communicating with the rotation center side space 24. In particular, since the downstream side of the air flow F is in a positive pressure state, air is pushed into the circumferential gap 25 from the outside.

  As described above, the amount of air flow in the fan boss 2 is increased by the rotation of the rotor yoke 9 having the ventilation groove 11, and the increased air flow is increased in the direction indicated by the arrow A in FIG. Therefore, in the fan boss 2, air can flow around the protrusions 20 of the heat sink member 19 to efficiently cool the heat sink member 19. Therefore, a necessary portion inside the motor can be cooled by heat conduction in the heat sink member 19.

  In particular, the fan boss hole 4 of the fan boss 2 is configured to communicate with the outer peripheral side opening 11b of the ventilation groove 11 and the negative pressure side of the fan boss 2 in the air flow F. It is possible to excite the exhaust of air inside the motor. Thereby, the cooling efficiency inside the motor can be further increased.

  Further, in the fan motor 1 according to the present embodiment, as described above, the annular waterproof ring that extends integrally with the rotor 8 toward the stator 13 is provided on the outer side in the radial direction of the bearing 6 a around the rotating shaft 5 of the rotor 8. 14 is provided, and the center piece 7 has a labyrinth structure that extends radially outward and whose extension end is located inside the waterproof ring 14 and prevents the bearing 6a from getting wet with the waterproof ring 14. A constituting flange 15 is provided.

  Accordingly, by adopting a structure in which air is circulated inside the motor and the members inside the motor are cooled like the fan motor 1 according to the present embodiment, even if water drops enter the motor, the waterproof ring 14 and The labyrinth structure constituted by the flange 15 can prevent the bearing 6a from getting wet.

  That is, even if water droplets enter the radial inside of the rotor 8 from the outside through the fan boss hole 4 and the ventilation groove 11, the water droplets are prevented from entering the bearing 6 a side by the waterproof ring 14, and the waterproof ring 14. It moves to the stator 13 side along the outer peripheral surface.

  At this time, even if the fan motor 1 is disposed sideways (rotation axis direction is horizontal), since the flange 15 is formed inside the waterproof ring 14, water droplets are moved toward the bearing 6a by the flange 15. You can prevent intrusion.

  Further, in the present embodiment, waterproof packings 36 and 38 that collectively waterproof the plurality of terminals 29 are disposed between the circuit case 22 and the center piece 7. Therefore, even if water droplets enter the motor, the plurality of terminals 29 can be collectively waterproofed by the waterproof packings 36 and 38.

  As a result, the terminal waterproof structure can be simplified as compared with the structure for waterproofing each of the plurality of terminals 29, so that the cost of the terminal waterproof structure can be reduced. Further, by simplifying the terminal waterproof structure, workability at the time of assembling the terminal waterproof structure is also improved. Furthermore, by using the annular waterproof packings 36 and 38 as in this embodiment, the plurality of terminals 29 can be reliably waterproofed collectively.

  In the present embodiment, the water droplet intrusion paths to the plurality of terminals 29 are finally combined into one between the center piece 7 and the circuit case 22. Accordingly, the waterproof range can be narrowed compared to a configuration in which a plurality of water droplet intrusion paths to the plurality of terminals 29 are provided, and thus the terminal waterproof structure can be small. Thereby, the cost of the terminal waterproof structure can be reduced.

  Furthermore, in the present embodiment, a plurality of terminals 29 and screws 34 that require a waterproof structure are arranged on the same circumference to make the range to be waterproofed as small as possible. Therefore, the cost of the terminal waterproof structure can be reduced also by this.

  Next, a modification of the above embodiment will be described.

  In the above-described embodiment, the terminal waterproof structure using the waterproof packings 36 and 38 is formed between the circuit case 22 and the center piece 7, but by providing the stator 13 with a seal member accommodating portion, the waterproof packing 36, A terminal waterproof structure using 38 may be formed between the circuit case 22 and the stator 13.

  Moreover, in the said embodiment, although the sealing member accommodating parts 30 and 32 which accommodate the waterproof packings 36 and 38 were formed in the circuit case side end surface of the center piece 7, it is formed in the center piece side end surface of the circuit case 22. May be.

  Furthermore, in the said embodiment, although the terminal waterproof structure became the structure which uses the double waterproof packing 36,38, when the waterproof packing 38 is unnecessary, as shown in FIG. 3, FIG. A terminal waterproof structure including only the waterproof packing 36 may be configured. 3 and 4 show a modified example of the fan motor according to one embodiment of the present invention. In this modified example, the same reference numerals are used for the same members as in the above embodiment. .

FIG. 1 is a cross-sectional view showing a configuration of a fan motor according to an embodiment of the present invention. FIG. 2 is a view of the stator shown in FIG. 1 as seen from AA. FIG. 3 is a view showing a modification of the fan motor according to the embodiment of the present invention. 4 is a view of the stator shown in FIG. 3 as viewed from BB.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Fan motor, 2 ... Fan boss, 2a ... Cylindrical outer peripheral part, 2b ... Cylindrical bottom part, 3 ... Fan blade, 4 ... Fan boss hole, 5 ... Rotation Shaft, 6a, 6b ... Bearing, 7 ... Centerpiece, 8 ... Rotor, 9 ... Rotor yoke, 9a ... Disc-shaped part, 9b ... Projection part, 10 ... Rotor magnet, 11 ... ventilation groove, 11a ... rotation center side opening, 11b ... outer periphery side opening, 12 ... air gap, 13 ... stator, 14 ... waterproof ring, 15 ... -Flange, 16 ... annular gap, 17 ... communication passage, 19 ... heat sink member, 20 ... projection, 21 ... air passage, 22 ... circuit case, 24 ... rotation Center side space, 25 ... circumferential gap, 26 ... stator core, 2 a ... salient pole, 27 ... stator coil, 28 ... drive circuit, 29 ... terminal, 30, 32 ... seal member housing, 34 ... screw, 35 ... screw hole 36,38 ... Waterproof packing, F ... Air flow

Claims (3)

A rotor configured with a rotating shaft;
A stator that is arranged so as to face the rotor in the axial direction with an air gap therebetween, and has a plurality of stator coils around the rotation axis;
A center piece that is provided integrally with or separately from the stator on the rotation shaft of the stator, and has a bearing that supports the rotation shaft.
A circuit case disposed on the opposite side of the stator in the axial direction from the rotor;
A plurality of terminals having one end connected to the stator coil and the other end protruding into the circuit case;
A drive circuit disposed in the circuit case and electrically connected to the stator coil via the plurality of terminals;
A fan boss that is fixed on the same axis as the rotor and is configured by a bottomed cylindrical member that rotates integrally with the rotor, and that houses the rotor and the stator inside the bottomed cylindrical member;
A fan motor provided integrally with an outer surface of the cylinder of the fan boss, and a fan blade that forms an air flow in a rotation axis direction with the rotation of the fan boss,
A fan motor, wherein a seal member for collectively waterproofing the plurality of terminals is disposed between the circuit case and the center piece or the stator. Around the rotating shaft of the rotor, on the outer side in the radial direction of the bearing, an annular waterproof ring is provided that extends to the stator side integrally or separately from the rotor,
The center piece has a flange that forms a labyrinth structure that extends outward in the radial direction and whose extension end is located inside the waterproof ring and prevents the bearing from getting wet with the waterproof ring. The fan motor according to claim 1, wherein the fan motor is provided.   The fan motor according to claim 1, wherein the seal member is configured by an annular waterproof packing.

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