JPH02155452A - Motor - Google Patents

Abstract

PURPOSE:To reduce sound and to increase lifetime by forming a groove pattern for generating dynamic pressure on one side faces of opposed pole and exciter. CONSTITUTION:A rotor magnet 1 magnetized axially in a plurality of poles is secured to a back yoke 2 with a magnetic material. The back yoke 2 is press-fitted in a motor shaft 6. On the other hand, a printed circuit board 3' made of a magnetic material is arranged concentrically with a stator winding 3. Further, a stator coil 3a formed by integrally molding the printed circuit board 3' and the stator winding 3 with insulating resin is disposed oppositely to the rotor magnet 1. Here, dynamic pressure generating groove pattern 40 is provided on the opposite face of the stator coil 3a. A guide hole 3h for guiding a motor shaft 6 is provided on the inner periphery of the stator coil 3a, and inserted into the motor shaft. Thus, the dynamic pressure generating pattern groove is formed to eliminate the necessity of using an expensive ball bearing, to reduce a sound and to increase its lifetime.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to motors used in various electronic devices.

BACKGROUND OF THE INVENTION In recent years, motors have been increasingly used in various electronic devices for the purpose of increasing performance and multifunctionality.

FIG. 14 shows a cross-sectional view of a conventional motor.

In FIG. 14, a rotor magnet 1 magnetized into a plurality of poles in the axial direction is fixed to a back yoke 2 made of a magnetic material by adhesive or the like. Also, a printed wiring board 3 made of magnetic material
The stator windings 3 are arranged concentrically and fixed with adhesive.

Further, the back yoke 2 has a boss portion 2 provided on its inner circumference.
A is press-fitted into the motor shaft 6, and the motor shaft 6 has a ball bearing 7r provided in a housing 80 fixed to the printed wiring board 3° by screws 90, and a sliding bearing 7 made of an oil-impregnated alloy.
It is rotatably supported by r'.

Here, the thrust attraction force generated between the rotor magnet 1 and the printed wiring board 3' is maintained by the boss portion 2a of the back yoke 2.
and the inner ring 7rl of the ball bearing 7r.

Furthermore, it is necessary to set the air gap between the rotor magnet 1 and the stator winding 3 to a predetermined value to prevent variations in motor characteristics from product to product. A shim 101 made by punching a stainless steel plate into an annular shape is inserted between the boss portion 2a of the tech back yoke 2 and the inner ring 7rl of the ball bearing 7r to adjust the amount of air gap.

Note that the sliding bearing 7r' is connected to the rotor magnet 1 and the printed wiring board 3.
The motor shaft 6 is tilted by the moment torque caused by the unbalance of the suction force between the
The amount of air gap between the rotor magnet 1 and the stator winding 3 is prevented from changing significantly.

Now, when a drive current is applied to the stator winding 3, the rotor magnet 1 and the back yoke 2 start rotating together with the motor shaft 6 due to the biasing of the stator winding 3. Therefore, the rotational biasing force of the motor is transmitted to the outside via the shaft 6.

Problems to be Solved by the Invention However, the above configuration has the following problems.

That is, since the ball bearing 7r is present, there is a problem that the material cost of the motor increases. Furthermore, when operating at high speeds, the number of balls used in the bearings increases, which lowers the quality of products using motors. Increased material costs and transfer costs can be reduced by adopting thrust plastic bearings, but plastic bearings generally have a lower load capacity than ball bearings, so there is a new issue of increased wear under heavy loads. arise.

In addition, it is generally necessary to have an air gap of about 0.5 to 11 between the rotor magnet 1 and the stator winding 3 in consideration of assembly accuracy and component accuracy. Therefore, the permeance coefficient of the magnetic circuit composed of the rotor magnet 1, the back yoke 2, and the printed wiring board 3° becomes small, and there is a problem that the magnetic energy of the rotor magnet 1 cannot be used effectively.

Furthermore, in order to stabilize the characteristics of the motor, it is necessary to reduce the variation in the amount of air gaps as much as possible, but to do so, it is necessary to significantly improve the accuracy of parts and assembly, making adjustments complicated. , which led to an increase in costs.

Means for Solving the Problems The technical means of the first invention for solving the above-mentioned problems includes a magnetic pole part including a magnet magnetized into a plurality of poles, and a magnetic pole part arranged opposite to the magnetic pole part and arranged on a concentric circle. The motor includes an excitation part including excitation windings of multiple phases arranged in the same direction, and a plurality of grooves for generating dynamic pressure are provided on one of the facing surfaces where the magnetic pole part and the excitation part face each other. By forming a pattern.

Further, the technical means of the second invention includes a magnetic pole part including a magnet magnetized into a plurality of poles, and a plurality of phases of excitation windings disposed opposite to the magnetic pole part and arranged concentrically. first and second groove patterns configured of an electromechanical transducer, arranged on one of the facing surfaces where the magnetic pole part and the excitation part face each other; By energizing, one of the first and second groove patterns is displaced in a direction perpendicular to the opposing surface according to the rotational direction of the motor, thereby forming grooves for generating dynamic pressure.

Effects The effects of the technical means of the first invention are as follows. That is, by forming the patterned grooves for generating dynamic pressure on the facing surfaces of the excitation part and the magnetic pole part as described above, there is no need to use expensive ball bearings (and quieter operation and longer life can be achieved).

Furthermore, since the amount of air gap between the excitation part and the magnetic pole part is reduced, the magnetic energy of the rotor magnet can be effectively utilized, thereby achieving higher efficiency of the motor.

The effects of the technical means of the second invention are as follows. In other words, as mentioned above, the pattern grooves for generating dynamic pressure that can rotate forward and backward are formed on the facing surfaces of the excitation part and the magnetic pole part, so it is possible to create a motor that can rotate forward and backward without using expensive ball bearings. In addition, it is possible to achieve quieter operation and longer life.

Furthermore, since the amount of air gap between the excitation part and the magnetic pole part is reduced, the magnetic energy of the rotor magnet can be effectively utilized, thereby achieving higher efficiency of the motor.

Example An embodiment of the first invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view of a brushless motor in a first embodiment of the first invention.

In FIG. 1, a rotor magnet 1 magnetized into a plurality of poles in the axial direction is fixed to a back yoke 2 made of a magnetic material by adhesive or the like. Further, the back yoke 2 is press-fitted onto the motor shaft 6.

On the other hand, stator windings 3 are arranged concentrically on a printed wiring board 3' made of a magnetic material. Further, a stator coil 3s formed by integrally molding a printed wiring board 3' and a stator winding 3 with an insulating resin faces the rotor magnet 1.

Here, a groove pattern 40 for generating dynamic pressure as shown in FIG. 2 is provided on the opposing surface of the stator coil 3s that faces the magnetic pole surface of the rotor magnet 1.

Further, a guide hole 3h for guiding the motor shaft 6 is provided in the inner peripheral portion of the stator coil 3s, into which the motor shaft 6 is inserted.

Next, the operation of this embodiment will be explained. Now, when a drive current is applied to the stator winding 3, the rotor magnet 1 fixed to the motor shaft 6 and the back yoke 2 start rotating integrally due to the bias of the stator winding 3. When the motor is stopped, the stator coil 3s and the rotor magnet 1 are in contact with each other, but as the motor rotates, dynamic pressure is generated in the groove pattern 40, and floating blades that levitate the rotor magnet 1 are generated. occurs and the rotor is in a non-contact state.

Here, a thrust attraction force is generated between the rotor magnet 1 and the printed wiring board 3', but as the rotor rotates, air flows along the groove pattern 40 of the stator coil 3s, and the air pressure increases, dynamic pressure is generated, and the rotor floats relative to the stator coil 3s, making it possible to maintain the thrust suction force.

Further, the air gap between the rotor magnet 1 and the stator coil 3s has a value that balances the floating blade generated by the groove pattern 40 and the thrust attraction force between the rotor magnet 1 and the printed wiring board 3'. take.

At this time, as shown in FIG. 3, the floating blade increases sharply as the amount of air gap decreases, but on the other hand, the change in the thrust suction force is gradual with respect to the change in the floating blade.

From this, even if the axial displacement is extremely small, it will be stable.

Therefore, when molding the stator coil 3s, the parallelism between the printed wiring board 3' and the surface forming the groove pattern of the stator coil 3s deteriorates, causing an imbalance in the thrust suction force and causing the motor shaft 6 to tilt. Even if a moment torque occurs, the amount of inclination of the motor shaft 6 can be suppressed to a minute value. That is, the oil-impregnated sliding bearing required in the conventional example can also be omitted, and in this embodiment, only the guide hole 3h into which the motor shaft 6 is inserted is provided.

In this way, according to this embodiment, the pattern groove for generating dynamic pressure is formed on the facing surfaces where the excitation part and the magnetic pole part face each other.
The following effects can be obtained.

That is, since it does not have a ball bearing, it is possible to provide a low-noise, low-cost motor.

In addition, since the amount of air gap is minute compared to the conventional method, the permeance coefficient of the magnetic circuit composed of the rotor magnet 1, back yoke 2, and printed wiring board 3' becomes larger than that of the conventional method, and the rotor magnet The magnetic energy of 1 can be used effectively, and there is no need to manage the amount of air gaps at all during assembly, and the variation in the amount of air gaps becomes minute, so the characteristics of the motor can be stabilized.

In addition, in the conventional configuration, when a thrust resin bearing was used instead of a ball bearing, there was a problem in that the end face of the thrust part suffered very large wear, but since it is constantly floating, wear basically occurs. do not.

As described above, according to this embodiment, it is possible to provide a highly reliable, low-noise, low-cost, and high-performance motor with a very simple configuration.

Next, a second embodiment of the first invention will be described. Fourth
The figure is a cross-sectional view of the motor in this embodiment.

In FIG. 4, a rotor magnet 1 magnetized into a plurality of poles in the axial direction is fixed to a back yoke 2 made of a magnetic material by adhesive or the like. Further, the back yoke 2 is press-fitted onto the motor shaft 6.

On the other hand, sheet coils 3p made of a thermosetting resin such as polyimide and formed into a concentric multi-phase coil pattern by plating or other processing are adhered to the printed wiring board 3' made of a magnetic material, and are attached to the stator. It constitutes a coil 3s. This stator coil 3s faces the rotor magnet 1 with a predetermined gap in between.

In this embodiment, rotor magnet 1 and stator coil 3
A lubricating oil (not shown) is filled in the gap between the s and the s. Further, pattern grooves 40 for generating dynamic pressure shown in FIG. 5 are formed on the magnetic pole surface of the rotor magnet 1 by plating.

An oil repellent (not shown) is applied to the outermost periphery of the magnetic pole surface of the rotor magnet 1 to prevent lubricating oil from leaking, and an oil repellent (not shown) is applied to the outer periphery of the stator coil 3s to prevent oil scattering and to protect the motor from leaking. A casing 3g is provided which also serves as a guide mechanism during assembly.

Next, the operation of this embodiment will be explained.

When the motor is stopped, the stator coil 3S and the rotor magnet 1 are in contact with each other, but as the motor rotates, dynamic pressure is generated in the groove pattern 40, and floating blades that levitate the rotor magnet 1 are generated. occurs and the rotor is in a non-contact state.

In this embodiment, lubricating oil is used as the working fluid. Since lubricating oil has a larger viscosity coefficient than air, using lubricating oil as the working fluid for generating dynamic pressure makes it possible to hold a larger thrust load than using air. This shows that even if the rotation speed of the rotor is relatively low, the rotor can quickly levitate relative to the stator.In this way, this embodiment has a very simple configuration. However, it becomes possible to provide a highly reliable, low-noise, low-cost, and high-performance motor.

In this embodiment, an oil repellent was applied to the rotor magnet 1 to prevent lubricating oil from leaking, and a casing 3g was provided to the stator coil 3s, but in order to further ensure the prevention of leakage. Instead of this lubricating oil, a magnetic fluid made by mixing magnetic material powder into a lubricant such as oil or grease may be used.

Next, a third embodiment of the first invention will be described based on the drawings. This embodiment is applied to a brush motor in which a magnet is fixed, an excitation winding is used as a rotor, and power is supplied to the excitation winding by a brush.

FIG. 5 is a cross-sectional view of a brush motor in a third embodiment of the first invention.

In FIG. 5, a stator magnet 1s magnetized into a plurality of poles in the axial direction is fixed to a back yoke 2 made of a magnetic material by adhesive or the like.

On the other hand, rotor windings 30 are arranged concentrically on a printed wiring board 3° made of a non-magnetic material such as a thermosetting resin. Further, a rotor coil 3r formed by integrally molding the printed wiring board 3' and the rotor winding 30 with an insulating resin faces the stator magnet 1s with a predetermined gap in between. Note that power is supplied to the rotor winding 30 via a printed wiring board 3' and a brush (not shown).

Furthermore, a stator yoke 50 made of a magnetic material is fixed to the back yoke 2 with a predetermined gap therebetween so as to sandwich the rotor coil 3r between the stator magnet 1s.

Here, a groove pattern for generating dynamic pressure is provided by sandblasting on the facing surface of the stator yoke 50 where the rotor coil 3r and the stator yoke 50 face each other. Furthermore, the gap in this opposing surface is filled with a magnetic fluid made by mixing magnetic material powder with a lubricant such as oil or grease to generate dynamic pressure, and supports the rotor coil 3r.

Further, a guide hole 3h for guiding the motor shaft 6 is provided in the inner peripheral portion of the stator yoke 50, into which the motor shaft 6 is inserted.

Next, the operation of this embodiment will be explained.

First, when the rotor is stopped, the rotor is urged downward in the drawing by its own weight, and the stator yoke 50 and the rotor coil 3r are in contact with each other.

At this point, when a drive current is applied to the rotor winding 30, the rotor winding 30 starts rotating integrally with the shaft 6.

As the rotor rotates, the magnetic fluid flows along the groove pattern 40 of the stator yoke 50, increasing the pressure of the fluid, generating dynamic pressure, and causing the rotor to levitate relative to the stator yoke 50. This allows it to hold its own weight.

Further, the gap between the stator yoke 50 and the rotor coil 3r has a value such that the floating blade generated by the groove pattern 40 and the weight of the rotor are balanced. At this time, the floating blade suddenly becomes larger as the amount of air gap becomes smaller. For this reason, the displacement in the axial direction is stabilized in an extremely small state.

As a result, the following effects can be obtained similarly to the first embodiment. In other words, since it does not have ball bearings, it has low noise and
A low cost motor can be provided.

In addition, in the conventional configuration, when a thrust resin bearing was used instead of a ball bearing, there was a problem in that the end face of the thrust part suffered very large wear, but since it is constantly floating, wear basically occurs. do not.

As described above, according to this embodiment, it is possible to provide a highly reliable, low-noise, low-cost, and high-performance motor with a very simple configuration.

Next, a fourth embodiment of the first invention will be described. 6th
The figure is a cross-sectional view of the motor of this embodiment.

In FIG. 6, a rotor magnet 1, which has a cylindrical shape and has a plurality of poles magnetized on its inner cylindrical surface, is fixed to a back yoke 2 made of a magnetic material by adhesive or the like. Further, the back yoke 2 is press-fitted onto the motor shaft 6.

On the other hand, stator windings 3 are arranged concentrically on the outer periphery of an annular stator yoke 50 made of a magnetic material and constituting a magnetic circuit with rotor magnets 1 and back yoke 2. Stator coil 3s formed by integrally molding wire 3 with insulating resin
is coaxially opposed to the rotor magnet 1 with a predetermined gap in between.

Here, the facing surface of the stator coil 3s facing the magnetic pole surface of the rotor magnet has a groove pattern 40 as shown in FIG.
is installed to generate dynamic pressure and support the rotor.

Further, one end surface of the motor shaft 6 is in contact with a thrust resin bearing 6o fixed to the stator coil 3s. The gap is filled with a magnetic fluid made by mixing magnetic material powder with a lubricant such as oil or grease to improve the efficiency of generating dynamic pressure and prevent lubricant oil from leaking. .

Next, the operation of this embodiment will be explained. Now, when a drive current is applied to the stator winding 3, the rotor magnet 1 fixed to the motor shaft 6 and the back yoke 2 start rotating integrally due to the bias of the stator winding 3.

Here, a thrust force is generated between the rotor and the stator due to their own weight, but this thrust force is held by the thrust resin bearing 60 via the motor shaft 6. Generally, the dead weight is about several grams to several hundred pounds, and in this case, the thrust resin bearing 60 can be made of polyacetal resin or the like, which is relatively inexpensive and has a small coefficient of friction.

Further, the average gap between the rotor magnet 1 and the stator coil 3s is determined by the mechanical clearance between the rotor magnet 1 and the stator coil 3s. If the rotational axis of the rotor tends to become eccentric with respect to the central axis of the stator due to side pressure applied to the motor shaft 6 or unbalance of the dynamic balance of the rotor, etc.
The air gap changes depending on the phase. Here, when the air gap in a certain phase decreases, the attractive force between the rotor magnet 1 and the stator yoke 50 in the same phase increases, so that the air gap tends to further decrease. - The repulsive force due to the dynamic pressure generated by the blade groove pattern 40 increases rapidly as the amount of voids decreases. Therefore, the amount of air gap takes a value such that the side pressure applied to the motor shaft 6, the radial attractive force between the rotor magnet 1 and the stator yoke 50, and the radial repulsive force due to the dynamic pressure are balanced.

Comparing the changes in the radial repulsive force and the radial suction force with respect to the amount of voids, as shown in FIG. 9, the change in the radial suction force is more gradual.

Therefore, even if there is an external force that causes the rotor magnet 1 to become eccentric,
It is possible to suppress the amount of eccentricity to a minute value.

As described above, according to this embodiment, the following effects can be obtained similarly to the first to third embodiments. That is, since it does not have a ball bearing, it is possible to provide a low-noise, low-cost motor.

In addition, since the amount of air gap is minute compared to the conventional method, the permeance coefficient of the magnetic circuit composed of the rotor magnet 1, back yoke 2, and stator yoke 50 becomes larger than that of the conventional method, and the permeance coefficient of the rotor magnet 1 The magnetic energy can be used effectively, and the variation in the amount of air gap with respect to the phase of the rotor is also small, so torque ripple can be reduced and the characteristics of the motor can be stabilized.

As described above, according to this embodiment, it is possible to provide a highly reliable, low-noise, low-cost, and high-performance motor with a very simple configuration.

Further, in the first to fourth embodiments, a sliding bearing or a ball bearing is not used in combination, but the patentability of the present invention will not be impaired even if these are used in combination depending on the application.

Similarly, the method for forming pattern grooves is not limited to those shown in the examples; for example, the pattern grooves can be formed by subjecting the rotor or stator to rolling, plastic working, sandblasting, plating, etching, ion blating, etc. You may do so.

Next, an embodiment of the second invention will be described based on the drawings. FIG. 10 is a cross-sectional view of a brushless motor in an embodiment of the second invention.

In FIG. 10, a rotor magnet 1 magnetized into a plurality of poles in the axial direction is fixed to a back yoke 2 made of a magnetic material by adhesive or the like. Further, the back yoke 2 is press-fitted onto the motor shaft 6.

On the other hand, a motor shaft 6 is mounted on a printed wiring board 3' made of magnetic material.
The boss portion 3 is provided with a guide hole 3h for guiding the
b is fixed with screws 90. A sheet coil 3p formed by forming a concentric coil pattern of multiple phases by plating or other processing on a thermosetting resin such as polyimide is adhered to this printed wiring board 3' to constitute a stator coil 3S. ing.

Here, a groove pattern forming device 100 for generating dynamic pressure is provided on the stator coil 3s. The configuration of this groove pattern forming device 100 is shown in FIG.

Here, an electrically grounded electrode 110 is fixed on the ceramic base plate 105, and laminated piezoelectric elements 113a, 113b are arranged on the electrode 112a,
112b. Here, the laminated piezoelectric elements 113a and 113b have a ring shape as shown in FIGS. 12 and 13, and form a wedge-shaped groove. Further, a ceramic cover 115 having a hole 120 into which the laminated piezoelectric elements LL3a, 113b fit,
It is on the electrode 110. Note that lead wires 130 a and 130 b are soldered to the electrodes 112 a and 112 b, and are connected to a power source (not shown).
Different voltages can be applied to 2a and 112b depending on the rotational direction of the motor.

When a positive voltage is applied to the electrodes 112a, 112b, the laminated piezoelectric elements 113a, 113b are displaced in a direction perpendicular to the electrodes, increasing their thickness.

In addition, in FIG. 11, the thickness ta of the electrode 112a and the laminated piezoelectric element 113a and the thickness tb of the electrode 112b and the laminated piezoelectric element 113b are the same as those of the electrodes 112a, 112.
When no voltage is applied to b, they are equal to each other and have the same thickness as the cover 115.

Note that the gap between the rotor magnet 1 and the stator coil 3s is filled with lubricating oil (not shown).

Furthermore, the outermost periphery of the magnetic pole face of the rotor magnet 1 and the cover 1
A lubricant (not shown) is applied to the gaps between the groove pattern forming device 15 and the laminated piezoelectric elements 113a and 113b to prevent lubricating oil from leaking from there. A casing 3g is provided which serves both to prevent oil scattering and to serve as a guide mechanism during motor assembly.

Next, the operation of this embodiment will be explained. When the motor is stopped, the stator coil 3s and the rotor magnet 1 are in contact with each other. Here, when a drive current is applied to the stator winding 3, the rotor magnet 1 fixed to the motor shaft 6 and the back yoke 2 start rotating integrally due to the bias of the stator winding 3.

Here, when the rotational direction of the motor is clockwise when the motor is viewed from the back yoke 2 side, a positive voltage is applied to the electrode 112a of the groove pattern forming device 100, and the electrode 11
Let the voltage of 2b be 0.

Then, since the thickness of the laminated piezoelectric element 113a increases, the appearance of the groove pattern forming device 100 is such that the wedge-shaped groove pattern 40a stands out as shown in FIG.

Then, dynamic pressure is generated in the groove pattern 40a along with the rotation of the motor, and floating blades that levitate the rotor magnet 1 are generated, so that the rotor is brought into a non-contact state.

On the other hand, if the rotation direction of the motor is
When the direction is counterclockwise when viewed from the side, a positive voltage is applied to the electrode 112b of the groove pattern forming device 100, and the voltage of the electrode 112a is set to O.

Then, since the thickness of the laminated piezoelectric element 113b increases, the appearance of the groove pattern forming device 100 is such that the wedge-shaped groove pattern 40b stands out as shown in FIG.

Then, as the motor rotates, dynamic pressure is generated in the groove pattern 40b, and floating blades that levitate the rotor magnet 1 are generated, so that the rotor is brought into a non-contact state.

Here, a thrust attraction force is generated between the rotor magnet 1 and the printed wiring board 3', but as the rotor rotates, the lubricating oil flows along the groove pattern 40a or 40b, and the pressure of the fluid increases. This increases the dynamic pressure and causes the rotor to float relative to the stator, making it possible to maintain the thrust suction force.

Further, the air gap between the rotor magnet 1 and the groove pattern former 100 balances the floating blade generated by the groove pattern 40a or 40b and the thrust attraction force between the rotor magnet 1 and the printed wiring board 3''. At this time, the floating blade increases rapidly as the air gap becomes smaller, as shown in Figure 3, but on the other hand, the change in thrust suction force is gradual with respect to the change in the floating blade. Therefore, the axial displacement is stabilized in an extremely small state.

Therefore, even if the printed wiring board 3' is warped and the thrust suction force is unbalanced, and a moment torque is generated that tends to tilt the motor shaft 6, the amount of tilt of the motor shaft 6 can be kept to a minute value. Is possible. That is, the oil-impregnated sliding bearing required in the conventional example can also be omitted, and it is sufficient to simply provide the guide hole 3h into which the motor shaft 6 is inserted, as in the present embodiment.

Note that the groove pattern forming device does not need to be a laminated piezoelectric element as in this embodiment. For example, piezoelectric material made of synthetic resin such as polyvinylidene fluoride and electrodes 112a, 112
b may be integrally formed. In this case, although the groove pattern forming device 100 is integrally molded without any breaks, it is possible to form groove patterns 40 a and 40 b that have the same shape as the electrodes 112 a and 112 b.

Furthermore, any configuration may be used as long as mechanical displacement can be obtained by supplying electric power. For example, a bimorph type piezoelectric element may be used.

In this way, according to this embodiment, the groove pattern former for generating dynamic pressure, which can be rotated forward and backward, is formed on the facing surfaces where the excitation part and the magnetic pole part face each other, so that the following effects can be obtained. can. That is, since it does not have a ball bearing, it is possible to provide a low-noise, low-cost motor.

In addition, there is no need to manage the amount of air gap during assembly, and since the variation in air gap amount is minimal, the characteristics of the motor can also be stabilized.

In addition, in the conventional configuration, when a thrust resin bearing was used instead of a ball bearing, there was a problem in that the end of the thrust part was extremely worn, but since it is constantly floating, there is basically no wear. Does not occur.

As described above, according to this embodiment, it is possible to provide a motor that has a simple configuration, has high reliability, low noise, low cost, high performance, and is capable of forward and reverse rotation.

Effects of the Invention As described above, according to the motor according to the first invention, there is a magnetic pole part including magnets magnetized into a plurality of poles, and a plurality of phases arranged concentrically and facing the magnetic pole part. The motor is composed of an excitation section including an excitation winding, and a groove pattern for generating dynamic pressure is formed on one of the facing surfaces of the magnetic pole section and the excitation section, which is expensive. The present invention is characterized in that it eliminates the need to use ball bearings and can provide a motor that is quieter and has a longer lifespan.

On the other hand, according to the motor according to the second aspect of the invention, the first and second parts are disposed on one of the facing surfaces where the magnetic pole part and the excitation part face each other, and are constituted by an electromechanical transducer. The motor is provided with a groove pattern, and when energized, one of the first and second groove patterns is displaced in a direction perpendicular to the opposing surface according to the rotational direction of the motor, thereby forming a groove for generating dynamic pressure. Therefore, there is no need to use expensive ball bearings, and it is possible to provide a motor that can rotate forward and reverse, is inexpensive, and achieves low noise and long life.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a brushless motor according to a first embodiment of the first invention, FIG. 2 is a shape diagram of a groove pattern provided on a stator coil 3s in the same embodiment, and FIG. 4 is a cross-sectional view of the brushless motor of the second embodiment of the first invention; FIG. 5 is a diagram of the shape of the groove pattern on the rotor magnet; FIG. The figure is a cross-sectional view of a brush motor according to a third embodiment of the first invention, FIG. 7 is a cross-sectional view of a brushless motor according to a fourth embodiment of the first invention, and FIG. 8 is a cross-sectional view of a brushless motor according to a fourth embodiment of the first invention. Fig. 9 is a diagram showing the relationship between radial suction force and radial repulsion force with respect to the amount of void, and Fig. 10 is a cross section of a brushless motor according to an embodiment of the second invention. 11 is a cross-sectional view of the groove pattern former, and FIG. 12 is a perspective view of the groove pattern former when the rotation direction of the motor is clockwise when looking at the motor from the back yoke 2 side. FIG. 13 is a perspective view of the groove pattern former when the rotation direction of the motor is clockwise when looking at the motor from the back yoke 2 side;
FIG. 14 is a cross-sectional view of a conventional motor. 1... Rotor magnet, 1s... Stator magnet, 2...
...Back yoke, 3...Stator winding, 3p...
・Sheet coil, 3'...Printed wiring board, 6...
・Motor shaft, 30... Rotor winding, 40.40a
, 40b... pattern groove, 50... stator yoke, 100... groove pattern former, 113a,
113b...Laminated piezoelectric element. Name of agent Patent attorney Shigetaka Awano 1 person/-11 Rotor sulfur 2- Node Tsukuyoke ZaL---Screen page 3---Fixed son law 3'-Chile I Division board 3L- 6゛L large 3s...-Stator fi) Is-Stator a5 stone 3 empty radiation dose 6θ---Thrust thrust bearing No. 10 3b-Hose portion 403mb-Groove hagoon j30yu, f3θb---Reet Ring 7 and 111 ball・Extrusion 5 Hifr・-Slip Bearing 7/-1 Inner width 80- H f7:/ink

Claims (2)

[Claims] (1) A magnetic pole part including a magnet magnetized into multiple poles,
A motor comprising an excitation part disposed opposite to the magnetic pole part and including excitation windings of multiple phases arranged concentrically, the motor having one opposing surface where the magnetic pole part and the excitation part face each other. A motor characterized in that a groove pattern for generating dynamic pressure is formed. (2) a magnetic pole part including a magnet magnetized into multiple poles;
In a motor including an excitation section that is arranged opposite to the magnetic pole section and includes excitation windings of multiple phases arranged concentrically, the magnetic pole section and the excitation section are arranged on one of the opposing surfaces facing each other. the first groove pattern and the second groove pattern are formed of an electromechanical transducer; A motor characterized by being displaced in a direction perpendicular to , to form a groove for generating dynamic pressure.