JP2002171717A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor which effectively suppresses transmission of vibration from its stator to the motor housing, and consequently reduces noise. SOLUTION: This motor is provided with a motor housing 2, a rotor 4 supported by the motor housing 2, in such a way as to be freely rotatable, magnets 32 fitted to the rotor 4, and a stator 12 contraposed to the magnets 32. To one end of a stator core 14 of the stator 12, a first insulating member 44a is fitted. To the other end, a second insulating member 44b is fitted. The first member 44a is fixed to the motor housing 2, with an elastic adhesive layer 72 between. The second member 44b is supported by the motor housing 2 via the medium of an annular elastic member 42, and the stator core 14 is held in a state of not touching the motor housing 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a motor for reducing transmission of vibration from a stator to a motor housing.

[0002]

2. Description of the Related Art Generally, a motor such as a DC motor has a motor housing, a rotor rotatably supported on the motor housing via a pair of bearings, a magnet mounted on the rotor, and a motor facing the magnet. The stator includes a stator core and a coil wound as required around the stator core. In an inner rotor type motor, a rotating shaft of the rotor is rotatably supported by a motor housing, and a magnet is mounted on the rotating shaft. The stator is disposed radially outward of the rotor magnet and attached to the inner peripheral surface of the motor housing. In the outer rotor type motor, the rotating shaft of the rotor is rotatably supported by the motor housing. For example, a cup-shaped rotor body is mounted on the rotating shaft, and a magnet is mounted on the rotor body. The stator is disposed radially inward of the magnet,
It is attached to a part of the outer peripheral surface of the motor housing.

[0003] In such a motor, the vibration generated by the excitation of the stator is directly transmitted to the motor housing, and such vibration is one of the causes of noise. In particular, when the frequency of the generated vibration matches the natural frequency of the motor housing, the motor housing resonates, and the generated vibration and noise increase. Therefore, in order to solve the above-described problem, there has been proposed a motor in which vibration transmitted from the stator to the motor housing is suppressed. In this proposed motor, a first insulating member is attached to one end of a stator core of the stator, and a second insulating member is attached to the other end. The first and second insulating members are formed of a synthetic resin, and the coil is wound around the outside of these insulating members, thereby ensuring electrical insulation between the coil and the stator core. An elastic annular member made of, for example, rubber is interposed between the second insulating member and the motor housing. One end of the stator core is interposed via the first insulating member, and the other end is connected to the second insulating member and It is supported by the motor housing via an elastic annular member.

[0004] In this improved motor, the stator core is supported by the first insulating member, the second insulating member, and the elastic annular member (these are press-fitted into the motor housing). The transmission of the generated vibrations to the motor housing is suppressed, whereby the noise caused by the magnetic sound can be suppressed.

[0005]

However, in the improved motor, there are the following problems to be solved. First, there is a possibility that the first and second insulating members are thermally deformed due to a temperature change when the motor is operated and when the operation is stopped. In particular, the first insulating member directly pressed into the motor housing is thermally deformed. Then, the fixing strength between one end of the stator and the motor housing is reduced.
When the fixing strength between the two members is reduced in this way, the vibration generated in the stator is likely to be transmitted to the motor housing, and the noise caused by the magnetic sound may recur, and the basic characteristics of the motor may be reduced. is there. Second,
Since it does not suppress the vibration itself generated by the stator, there is a limit to the reduction of noise caused by magnetic noise.Especially for motors with large output, it is necessary to sufficiently reduce the noise generated by magnetic noise of the stator. Have difficulty.

An object of the present invention is to provide a motor capable of effectively suppressing transmission of vibration from a stator to a motor housing, thereby further reducing noise. Another object of the present invention is to provide a motor that can reduce the vibration itself generated in the stator.

[0007]

SUMMARY OF THE INVENTION The present invention provides a motor housing, a rotor rotatably supported on the motor housing via bearing means, a magnet mounted on the rotor, and a motor facing the magnet. And a stator having a stator core and a coil wound around the stator core, wherein one end of the stator core is provided with a first insulating member, and the other end is provided with a second insulating member. A member is mounted, and an elastic annular member for elastically holding the stator is interposed between one of the first and second insulating members and the motor housing. Second
The other of the insulating members is fixed to the motor housing by an elastic adhesive, and the stator core is elastically supported by the motor housing via the first and second insulating members, the elastic annular member and the adhesive layer. The motor housing is held in a non-contact state with respect to the motor housing.

According to the present invention, first and second insulating members are mounted on both ends of the stator core, and an elastic annular member is interposed between one of the insulating members and the motor housing. The other is fixed to the motor housing via a layer of elastic adhesive. Accordingly, the stator is elastically supported by the motor housing via the elastic annular member and the elastic adhesive layer, and is held in a non-contact state with respect to the motor housing. The transmission to the motor is suppressed, and the generation of motor vibration and noise can be suppressed. In addition, since one of the first and second insulating members is supported via the elastic annular member, even if it is slightly thermally deformed, such thermal deformation is absorbed by the elastic annular member, and the mounting due to the thermal deformation is performed. A decrease in strength can be prevented.
Further, since the other of the first and second insulating members is supported via the elastic adhesive, the fixing strength to the motor housing is increased by the elastic adhesive. State can be maintained.

According to the present invention, the coil wound around the stator core is fixed by melting and solidifying a fusion layer existing on the surface or impregnating with a molten resin liquid. . According to the present invention, the coil wound on the stator core melts and solidifies the fusion layer,
Alternatively, since the coil is fixed by being impregnated with the molten resin liquid, the generation of vibration when energizing the coil is suppressed, and the vibration itself generated in the stator can be reduced.

In the present invention, the first and second insulating members are fixed to the stator core by an adhesive. According to the present invention, the first and second
Since the insulating member is fixed to the stator core by the adhesive, the vibration itself generated in the stator core can be further reduced. Further, in the present invention, the stator core is configured by laminating a plurality of core plates, and the plurality of core plates are fixed by melting and solidifying a fusion layer existing on the surface. I do.

According to the present invention, since the core plate of the stator core is fixed by melting and solidifying the fusion layer, the vibration of the core plate is effectively suppressed, and the vibration itself generated in the stator is further reduced. Can be. Further, in the present invention, the magnet is magnetized so that the magnetized waveform has a substantially sinusoidal waveform in the circumferential direction, and the air gap between the magnet and the stator core is 0.7 to 0.5 mm.
8 mm.

According to the present invention, since the magnetized waveform of the magnet is substantially sinusoidal and the air gap between the stator core and the magnet is 0.7 to 0.8 mm, cogging is reduced, and motor vibration and noise are reduced. Can be suppressed, and the rotation of the rotor can be made smooth.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a motor according to the present invention will be described with reference to the accompanying drawings. FIG.
Is a cross-sectional view showing a motor of an embodiment of the present invention,
2 is an exploded perspective view showing the motor of FIG. 1 in an exploded manner, FIG. 3 is a plan view showing a stator core of the motor of FIG. 1, and FIG. 4 is an elastic annular shape showing a spacer of the motor of FIG. It is a front view which shows a member. Referring to FIG. 1, the illustrated motor includes a cup-shaped motor housing 2 and a rotor 4 rotatably supported by the motor housing 2. The motor housing 2 has a cylindrical peripheral side wall 6, one end of the peripheral side wall 6 is open, and an end wall 8 is provided at the other end. A cover 10 is provided at an open end of the motor housing 2, and the cover 10 is fixed to the motor housing 2 as described later.

A stator 12 is provided on the inner peripheral surface of the peripheral side wall 6 of the motor housing 2. The stator 12
A stator core 14 formed by stacking core plates 15 is provided. As shown in FIG. 3, the stator core 14 has an annular core body 16 and teeth 18 extending radially inward from the core body 16, and the teeth 18 substantially extend in the circumferential direction of the core body 16. A plurality of them are provided at equal intervals, and in this embodiment, twelve are provided. The core body 1 is provided at both ends of the stator core 14.
First and second insulating members 44a, 44b made of resin corresponding to the surface shapes of the teeth 6 and the teeth 18 are fitted, and each tooth 18 is placed on the insulating members 44a, 44b.
Then, the coil 20 is wound as required, and the coil 2
0 is supplied with the drive current. Insulating members 44a, 44b
Is for achieving electrical insulation between the stator core 14 and the coil 20. The stator 12 and its related configuration will be described later in detail.

The rotor 4 is disposed radially inside the stator 12. In this embodiment, the motor housing 2
At the center of the end wall 8, a circular protrusion 2 protruding outward (rightward in FIG. 1) in the axial direction (left-right direction in FIG.
2 is provided, and one ball bearing 24 of the bearing means is disposed inside the circular projection 22. Also, the cover 10
At the center of the outer side in the axial direction (left side in FIG. 1)
Is provided, and the other ball bearing 28 of the bearing means is disposed inside the circular projection 26. The rotor 4 includes a rotor body 30 having a cylindrical outer shape, and a rotation shaft 31 is provided through the rotor body 30. One end (the left end in FIG. 1) of the rotating shaft 31 is rotatably supported by the protrusion 26 of the cover 10 via the ball bearing 28, and the other end (the right end in FIG. 1) is the ball bearing 24. Is rotatably supported by the protrusion 22 of the housing 2. In this embodiment, one end of the rotating shaft 31 penetrates through the cover 10 and protrudes outward, and a rotational load such as a fan impeller is mounted on the protruding end. Further, a disc spring 34 is interposed between one of the ball bearings 24 and the inner surface of the circular projection 22 of the motor housing 2, and the disc spring 34 applies a preload to the pair of ball bearings 24 and 28.

An annular magnet 32 is mounted on the outer peripheral surface of the rotor body 30. This magnet 32
As shown in FIG. 1, it is disposed radially inward so as to face the stator core 14, specifically, face the tip surfaces of the teeth 18. It is desirable to configure the magnet 32 as follows. That is, the annular magnet 32 has a plurality of magnetized magnets (N pole,
S poles) are alternately arranged in the circumferential direction. At the time of magnetizing the magnet 32, it is desirable to magnetize the magnetized waveform so that the magnetized waveform becomes substantially sinusoidal in the circumferential direction. By magnetizing in this manner, the magnitude of the magnetic force of the magnet 32 in the circumferential direction is reduced. It has a sine wave shape. In connection with this, the distance between the outer peripheral surface of the magnet 32 and the distal end surfaces (circles defined by these distal end surfaces) of the plurality of teeth portions 18 of the stator core 14, that is, the air gap between the two is conventionally determined. Is preferably set to 0.7 to 0.8 mm for about 0.5 mm. By setting in this manner, the magnetic action between the stator 12 and the magnet 32 does not change rapidly, and cogging can be reduced and generation of vibration noise of the motor can be suppressed.

A circuit board 36 is provided in connection with the stator 12. A predetermined circuit pattern (not shown) is formed on the circuit board 36, and the driving IC 38, the hall element 40, and the like are electrically connected to the circuit pattern, and the coil 20 of the stator 12 is also electrically connected. ing. With such a configuration, when a drive current is supplied to the coil 20 through the circuit pattern of the circuit board 36, the teeth 18 of the stator core 14 are excited as required, and the mutual magnetic action between the teeth 18 and the magnet 32 causes , The magnet 32, the rotor body 30, and the rotating shaft 31 are driven to rotate in a predetermined direction.

Next, the stator 12 and its related structure will be described with reference to FIGS. In this embodiment, one end (the left end in FIGS. 1 and 2) of the stator core 14 is supported by the motor housing 2 via an elastic adhesive layer 72, and the other end (the right end in FIGS. 1 and 2). The end is supported by the motor housing 2 via the elastic annular member 42, that is, the stator 12 is held in a non-contact state with the motor housing 2. In this embodiment, the elastic annular member 42 is ring-shaped, and its cross-sectional shape is substantially L-shaped corresponding to the shape of the corner between the peripheral side wall 6 and the end wall 8 of the cup-shaped motor housing 2. . One end surface of the elastic annular member 42 (FIG. 1)
In addition, on the outer peripheral portion of the end surface facing the left side in FIG. 2 and the end surface facing the front side in FIG. Six holding projections 46 are provided (see FIGS. 2 and 4). These holding projections 46 extend in the axial direction of the motor (the left-right direction in FIGS. 1 and 2). The outer shape of the core body 16 of the stator core 14 is formed in a substantially regular dodecagonal shape (see FIG. 3).
The inner surfaces of the plurality of holding projections 46
(See FIG. 4). With this configuration, the core body 16 of the stator core 14 is mounted inside the plurality of holding projections 46 so as to abut the one end surface of the elastic annular member 42 (see FIG. 1). In such a mounted state, the plurality of holding projections 46 are located radially outward of the other end of the stator core 14, and the one end surface of the elastic annular member 42 is located axially outward of the other end of the stator core 14. As a result, the other end portion of the stator core 14 and the second insulating member 44b covering the same do not directly contact the motor housing 2. Further, since the inner surface of the holding projection 46 acts on the outer surface of the core body 16 of the stator core 14, the stator core 14 does not rotate relative to the elastic annular member 42 and may move in the radial direction. Absent. Such an elastic annular member 42 is formed of a rubber material such as urethane rubber as one of materials having a high damping effect. In this embodiment, the holding projections 4
6 are provided at intervals in the circumferential direction, but such holding projections may be provided annularly on the outer peripheral portion of one end surface of the elastic annular member 42.

A plurality of the elastic annular members 42 are provided on the surface in contact with the motor housing 2, in this embodiment, on the surface in contact with the end wall 8 of the motor housing 2 at intervals in the circumferential direction. Five first bending recesses 48 are provided at substantially equal intervals (see FIGS. 1 and 4). These first bending recesses 48 are elongated in the circumferential direction. By providing the first bending recesses 48 in this manner, the elastic annular member 42 itself is easily elastically deformed. When the member 42 is mounted on the housing 2, the space between the elastic annular member 42 and the housing 2 is brought into close contact. The shape and number of the first bending concave portions 48 can be appropriately set in consideration of the degree of bending of the annular member 42 itself.

The elastic annular member 42 further has circumferentially spaced inner circumferential surfaces and outer circumferential surfaces, and in this embodiment, six second flexing recesses 50 and 52 at substantially equal intervals. Is provided. The second bending recesses 50 and 52 extend linearly in the axial direction of the motor (the direction perpendicular to the plane of FIG. 4). As described above, the second bending concave portions 50, 5
By providing 2, elastic deformation of the elastic annular member 42 itself is further facilitated. The second bending concave portions 50 and 5
The shape and number of 2 can be appropriately set in consideration of the degree of bending of the elastic annular member 42 itself.

In this embodiment, the second bending concave portions 50 and 52 are provided on the inner peripheral surface and the outer peripheral surface of the elastic annular member 42. However, a desired effect can be achieved only by providing them on either one of them. . Further, the first elastic concave member 48 and the second concave concave portions 50 and 52 are provided in the elastic annular member 42. When sufficient elasticity can be secured in the elastic annular member 42 itself, one of these is replaced. Alternatively, both of them can be omitted.

The illustrated first insulating member 44a is annular,
It has an annular main body 54. A plurality of holding projections 56 are provided on the outer peripheral surface of the annular main body 54 at intervals in the circumferential direction.
Is provided. The ends (right ends in FIGS. 1 and 2) of the holding projections 56 project outward from the annular main body 54 in the axial direction, and one end of the stator core 14 is mounted inside the projections. First insulating member 44
a is fixed to the inner peripheral surface of the peripheral side wall 6 of the motor housing 2 by an elastic adhesive, as shown in FIG. In this fixed state, the plurality of holding projections 56 are located radially outside the stator core 14 and the plurality of holding projections 5
6 and annular body 54 and peripheral side wall 6 of motor housing 2
The stator core 14 is elastically supported by the peripheral side wall 6 without contacting the peripheral side wall 6 of the motor housing 2 because the layer 72 of the elastic adhesive is interposed between them. As the elastic adhesive, a liquid moisture-curable elastic adhesive mainly containing a special synthetic resin containing a silyl group can be used. Further, the first and second insulating members 44a and 44b can be formed from a synthetic resin material such as nylon, PBT, POM, or the like. In this embodiment, the plurality of holding projections 56 are provided at intervals. However, the holding projections 56 may be formed in an annular shape, and one end of the stator core 14 may be supported by the annular holding projections 56. Good.

A shoulder 58 is provided on the inner peripheral surface of the other end of the annular main body 54 of the first insulating member 44a by changing its inner diameter (see FIGS. 1 and 2). An engagement claw portion 60 is integrally provided at the other end of the annular main body portion 54 by partially cutting the portion in the axial direction. As shown in FIG. 2, a pair of engaging claw portions 60 are provided at opposed portions of the annular main body portion 54. A part 62 is provided. These engagement claws 60 are
The base can be used as a fulcrum to elastically deform in the radial direction.

The circuit board 36 is mounted on the first insulating member 44a as shown in FIGS. That is, the circuit board 3
6 is brought into contact with the shoulder 58 of the first insulating member 44a, and by this contact, the pawls 62 of the plurality of engaging pawls 60 are engaged with a part of the circuit board 36. The board 36 is elastically held by the engaging claw portions 60, and the claw portions 60 reliably prevent the board 36 from being detached from the first insulating member 44a. In the illustrated embodiment, the stator core 14
The first and second insulating members 44a and 44b are fitted at both ends of the stator core 1 using an adhesive.
Preferably, it is fixed at 4. By using the adhesive, the insulating members 44a and 44b are firmly fixed to the stator core 14, so that the vibration itself generated in the stator core 14 at the time of excitation can be reduced.

The coil 20 wound around the stator core 14
It is desirable to use the one shown in FIG. FIG.
The coil 20 shown in the figure is formed of a so-called fused copper wire, a copper wire 74 for passing electricity is provided at the center, and an insulating film 76 formed of, for example, a synthetic resin is provided so as to cover the copper wire 74. And a fusion coating 78 is provided so as to cover the insulating coating 76. The fusion coating 78 as the fusion layer is formed from, for example, a polyester, polyamide, or butyral resin. For example, the coil 2 having the fusion coating 78 formed of butyral-based resin
When 0 is used, the alcohol may be permeated after winding the coil 20 around the plurality of teeth portions 18 of the stator core 14 as required. Thus, when the alcohol is infiltrated, the fusion coating 78 is chemically melted and the adjacent fusion coatings 78 fuse with each other.
In addition, the vibration itself generated in the stator core 14 can be reduced. When a normal copper wire (copper wire is simply covered with an insulating film) is used as the coil 20, the coil 20 is wound around the stator core 14 as required and then impregnated with a molten resin liquid to form the coil 20. It is desirable that the coil 20 be fixed. Even if the coil 20 is fixed in this way, the same effect as that obtained by using the fused copper wire is achieved.

The core plate 1 of the stator core 14
5 is desirably used in the form shown in FIG. In FIG. 6, the illustrated core plate 15 has a steel plate 82, and fusion coatings 84, 8 are formed so as to cover the surface of the steel plate 82.
6 are provided. Fusion coatings 84, 8 as fusion layers
6 is formed of, for example, an organic synthetic resin, for example, about 5
Apply a pressure of 0 N / cm ² or more or 200 to 250 ° C
Then, the fusion coatings 84 and 86 are fused to each other to form the stator core 14. In such a stator core 14, since the core plates 15 are securely fixed in a stacked state, the vibration itself generated in the stator core 14 at the time of excitation can be reduced.

The motor described above is assembled, for example, as follows. Referring mainly to FIGS. 1 and 2, first, first and second insulating members 44a,
44b is fixed by using an adhesive, and then the coil 20 is wound to form the stator 12 shown in FIG.
The elastic annular member 42 is attached to one end of the second. The attached elastic annular member 42 is fixed to the stator core 1 by the holding projection 46.
4 temporarily. Further, the circuit board 60 is mounted on the first insulating member 44a, and is engaged with the engaging claw portion 60.

Next, after applying such an elastic adhesive to the outer peripheral surface of the first insulating member 44a, the stator 12 is inserted from the opening side of the motor housing 2 to the end wall 8. When attached, the first insulating member 44a becomes the layer 7 of the elastic adhesive.
2 and is securely fixed to the peripheral side wall 6 of the motor housing 2, and a sufficient fixing strength between the two is secured by the adhesive layer 72. At this time, when an adhesive is applied to the outer surface of the elastic annular member 42 and attached, the adhesive is interposed between the annular member 42 and the inner surface of the housing 2, and the first and second bending recesses 48 and 52 are provided. The gap between the elastic annular member 42 and the housing 44 is substantially eliminated, and the occurrence of vibration of the stator 12 can be further suppressed.

Thereafter, the disc spring 34 and one of the ball bearings 24 are inserted into the circular projection 22 of the housing 2, and then the rotor 4 on which the magnet 32 is mounted is mounted.
1 is inserted into the ball bearing 24. At this time, the other ball bearing 28 is mounted on the rotating shaft 31 of the rotor 4 in advance. Thereafter, the cover 10 is attached so as to fit the rotation shaft 31 of the rotor 4 and is fixed to the motor housing 2. Thus, the motor can be assembled as shown in FIG. In this assembly, FIGS. 1 and 2
As can be understood from FIG.
In addition, the cover 10 may be moved in the axial direction and inserted through the end opening of the motor housing 2, and the assembling work is easy. Further, the circuit board 36 can be assembled in substantially the same manner, and the assembling operation is facilitated. When the cover 10 is attached, the outer peripheral portion of the cover 10 abuts against the end surface of the annular main body portion 54 of the first insulating member 44a and presses this in the axial direction. Thus, the stator 12 becomes the elastic adhesive layer 72, Annular member 42, first and second insulating members 4
4a, 44b and the motor housing 2
And the cover 10 is kept in a non-contact state. Therefore, the magnetic vibration generated by the excitation of the stator 12 is absorbed by the damping effect due to the elastic deformation of the elastic adhesive layer 72 and the elastic annular member 42, transmission to the motor housing 2 is suppressed, and the generation of vibration and noise is reduced. be able to.

In this embodiment, as shown in FIG. 2, a substantially rectangular notch 66 extending inward in the axial direction is provided at the opening end of the peripheral side wall 6 of the motor housing 2 at intervals in the circumferential direction. Formed on the outer periphery of the cover 10.
Corresponding to these notches 66, fixing projections 68 extending radially outward are provided. The fixing projection 68 is positioned within the notch 66 of the housing 2, and the fixing projection 6
By caulking the cover 8, the cover 10 is caulked to the peripheral side wall 6 of the housing 2, and the cover 10 can be securely fixed by a simple operation.

In this motor, for example, the stator core 14
12 are provided, five holding projections 46 of the elastic annular member 42, and five first bending recesses 48 are provided, and the numbers are different from each other. Therefore, the vibration transmitted from the stator 12 to the annular member 42 hardly resonates, and the transmission of the vibration is more effectively attenuated. In the motor assembled in this way, by releasing the caulked connection between the cover 10 and the housing 2, the motor can be disassembled and various components can be easily removed.

Although one embodiment of the motor according to the present invention has been described above, the present invention is not limited to such an embodiment, and various changes and modifications can be made without departing from the scope of the present invention. . For example, in the illustrated embodiment, the first insulating member 44a is fixed to the motor housing 2 via the elastic adhesive layer 72, and the second insulating member 44b is supported on the motor housing 2 via the elastic annular member 42. However, on the contrary, the first insulating member 4
4a may be supported by the motor housing 2 via the elastic annular member 42, and the second insulating member 44b may be fixed to the motor housing 2 via the elastic adhesive layer 72.

For example, in the illustrated embodiment, the present invention is applied to an inner rotor type motor in which the rotor 4 is disposed radially inside the stator 12, but the present invention is not limited to this. The present invention can be similarly applied to an outer rotor type motor in which a rotor is disposed outside.

[0034]

According to the motor of the first aspect of the present invention, the first and second insulating members are attached to both ends of the stator core, and the elastic annular member is provided between one of these insulating members and the motor housing. And the other of these insulating members is supported by the motor housing via a layer of elastic adhesive, so that the stator is elastically supported by the motor housing and is brought into a non-contact state with the motor housing. Thus, the transmission of the vibration generated in the stator to the motor housing is suppressed, and the vibration and noise of the motor can be suppressed.

According to the motor of the second aspect of the present invention, the coil wound around the stator core is fixed by melting and solidifying the molten layer or impregnating with the molten resin liquid. Is suppressed, and the vibration itself generated in the stator can be reduced. Further, according to the motor of claim 3 of the present invention, the first and second motors are provided.
Since the insulating member is fixed to the stator core by the adhesive, the vibration itself generated in the stator core can be further reduced.

According to the motor of the fourth aspect of the present invention, since the core plate of the stator core is fixed by melting the molten layer, the vibration of the core plate is effectively suppressed, and the vibration generated in the stator is reduced. This can be further reduced. Further, according to the motor of claim 5 of the present invention, the magnet is magnetized so that the circumferential magnetization waveform is substantially a sine wave, and the air gap between the stator core and the magnet is set to 0.7 to 0.8 mm. Therefore, cogging can be reduced, and generation of motor vibration and noise can be suppressed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a motor according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing the motor of FIG. 1 in an exploded manner.

FIG. 3 is a plan view showing a stator core of the motor shown in FIG. 1;

FIG. 4 is a front view showing an elastic annular member of the motor of FIG. 1;

FIG. 5 is an enlarged sectional view showing a part of a coil of a stator.

FIG. 6 is an enlarged sectional view showing a part of a core plate of a stator.

[Explanation of symbols]

 2 Motor Housing 4 Rotor 12 Stator 14 Stator Core 15 Core Plate 20 Coil 24, 28 Ball Bearing 32 Magnet 42 Annular Elastic Member 44a, 44b Insulating Member 72 Layer of Elastic Adhesive 78, 84, 86 Fused Coating

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroki Ichinose 2-2-113 Nishiki, Naka-ku, Nagoya City, Aichi Prefecture Inside Ricoh Elemex Co., Ltd. Nidec Corporation Shiga Technology Development Center (72) Inventor Yoshiharu Morishitabara 55 Shozo Mizuguchi, Mizoguchi-machi, Hino-gun, Tottori Japan Nihon Electronics Electronics Corporation Tottori Technology Development Center F-term 5H604 AA05 BB01 BB14 CC01 CC05 DA14 DA16 DA19 DB16 DB19 PB03 PB04 QA03 5H605 AA04 AA05 BB05 CC02 CC03 CC10 DD05 DD24 EA07 EA15 EB10 FF06 5H621 AA04 GA01 GB04 HH03 JK07

Claims (5)

[Claims] A motor housing; a rotor rotatably supported by the motor housing via bearing means; a magnet mounted on the rotor; and a stator disposed to face the magnet. And a motor having the stator having a stator core and a coil wound around the stator core, wherein one end of the stator core is provided with a first insulating member, and the other end is provided with a second insulating member.
And an elastic annular member for elastically holding the stator is interposed between one of the second insulating members and the motor housing, and the other of the first and second insulating members is elastic. The stator core is fixed to the motor housing by an adhesive, and the stator core is elastically supported by the motor housing via the first and second insulating members, the elastic annular member, and the adhesive layer, and is fixed to the motor housing. A motor that is held in a non-contact state with respect to the motor. 2. A coil wound around the stator core,
2. The motor according to claim 1, wherein the motor is fixed by melting and solidifying a fusion layer existing on the surface or by impregnating with a molten resin liquid. 3. The motor according to claim 1, wherein the first and second insulating members are fixed to the stator core by an adhesive. 4. The stator core is formed by laminating a plurality of core plates, and the plurality of core plates are fixed by melting and solidifying a fusion layer existing on a surface. The motor according to claim 1. 5. The magnet is magnetized so that a magnetized waveform has a substantially sinusoidal waveform in a circumferential direction, and an air gap between the magnet and the stator core is 0.7 to 0.8.
The motor according to any one of claims 1 to 4, wherein the distance is in mm.