JP6576505B1 - Rotating electric machine - Google Patents

Abstract

Vibration and noise are reduced by filling a gap with resin even when a stator core divided in the circumferential direction does not accurately follow the frame. A plurality of stator cores 3 divided in a circumferential direction and a frame 5 for holding the stator core 3 on an inner peripheral surface, and a gap 8 for filling a resin RS between the frame 5 and the stator core 3 are provided. The gap 8 is provided in part or all between the frame 5 and the stator core 3. [Selection] Figure 2

Description

  This application relates to vibration suppression of a rotating electrical machine.

With the background of global warming, motors are being installed in cars for the purpose of reducing CO ₂ emissions and improving fuel efficiency. In order to improve fuel efficiency, motors are required to be lighter and vibration and noise reduction is required to ensure quietness.
In a motor composed of a rotor incorporating a permanent magnet and a stator having a plurality of teeth, the stator receives an electromagnetic excitation force accompanying the rotation of the rotor and vibrates. This vibration may cause noise, leading to noise problems in the passenger compartment. In order to suppress the noise in the vehicle, it is necessary to suppress the vibration of the stator.

JP 2009-124851 A

If the core and frame are thickened to increase rigidity, vibration and noise can be suppressed. However, since the motor is heavy, it does not meet the requirements. In the prior art, resin is injected into the gap between the teeth in order to suppress vibration (see Patent Document 1).
However, when the resin is filled between the teeth, there is a problem that the ratio of the coil between the teeth (the space factor of the coil) is reduced and the efficiency of the motor is reduced. In addition, when aligning a plurality of cores in an annular shape and fitting them with a frame, there is a problem that tolerances of the cores are piled up and the cores are not aligned with the frame with high accuracy. Therefore, there is a problem that a gap is formed between the core and the frame, the fixing force is reduced, and vibration and noise are easily generated.

The rotating electrical machine disclosed in this application includes a plurality of stator cores divided in the circumferential direction, a frame for holding the stator core on an inner peripheral surface, a bus bar for supplying power to a coil wound around the stator core, be those having a holder for holding the busbar fixed to the frame, and a tree fat filling groove provided between said frame stator core, wherein said bus bar holder is formed in one end of the frame The resin-filled groove portion is provided on a part or all of the space between the inner peripheral surface of the frame and the outer peripheral surface of the stator core, and the resin-filled groove portion is filled with resin. .

  According to the rotating electrical machine disclosed in this application, even if the stator core divided in the circumferential direction is not accurately along the frame, vibration and noise can be reliably reduced by filling the gap with resin.

FIG. 2 is a perspective view and a longitudinal sectional view showing the overall configuration of the rotating electrical machine in the first embodiment. FIG. 3 is a partial cross-sectional view of the rotating electrical machine in the first embodiment. FIG. 6 is a partial cross-sectional view and a partial plan view of a rotating electrical machine according to Embodiment 2. FIG. 9 is a partial cross-sectional view of a rotating electrical machine in a third embodiment. FIG. 9 is a partial cross-sectional view of a rotating electrical machine in a third embodiment. FIG. 9 is a partial cross-sectional view of a rotating electrical machine in a fourth embodiment. FIG. 6 is a partial cross-sectional view and a perspective view of a rotating electrical machine according to a fifth embodiment. FIG. 10 is a perspective view of a rotating electrical machine in a sixth embodiment. FIG. 10 is a partial cross-sectional view of a rotating electrical machine in a seventh embodiment. The curve figure which shows the graph which compared the vibration response characteristic of the conventional rotary electric machine and the rotary electric machine in this application.

Embodiment 1 FIG.
A rotating electrical machine composed of a motor in the first embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 shows the overall configuration of a motor according to Embodiment 1, FIG. 1 (a) shows a perspective view, and FIG. 1 (b) shows a longitudinal sectional view. FIG. 2 is a partial cross-sectional view of the motor according to the first embodiment.

  A motor 1 serving as a rotating electrical machine includes a stator 2 and a rotor (not shown) that is disposed with an outer peripheral surface facing the inner peripheral surface of the stator 2. The inner periphery of the stator 2 faces the outer periphery of the rotor with a predetermined gap. The stator 2 is formed by laminating a plurality of stator cores 3 formed by laminating a plurality of plate materials in an annular shape in the circumferential direction, and a coil 4 wound around a tooth 3 a protruding to the inner peripheral side of the stator core 3 and the stator core 3. A hollow cylindrical metal frame 5 to be held, a plurality of bus bars 6 for connecting a plurality of coil terminals in the coil 4, and a holder 7 for housing the bus bars 6 integrally. The stator core 3 is fixed by being fitted to the frame 5, and the stator core 3 is held on the inner peripheral surface of the frame 5. A gap 8 is provided between the outer peripheral surface of the stator core 3 and the inner peripheral surface of the frame 5 and filled with the resin RS.

The gap 8 is formed by a recess 5 a provided on the inner peripheral surface of the frame 5 to form the resin-filled groove portion RC, and is set over the entire axial direction of the outer peripheral surface of the stator core 3, and the outer peripheral surface of the stator core 3. Is set to all or part of the circumferential direction. The resin RS is filled in all of the resin filling groove portions RC including the gaps 8 set in this manner without generating voids.
By filling the resin RS, it is possible to suppress the vibration of the stator core 3 generated by the electromagnetic excitation force when the rotor 2 rotates. In particular, by filling the resin between the stator core, which is a fixed portion (fitting portion) of the stator core 3, and the frame, vibration can be effectively suppressed.

Further, when a plurality of cores 3 are arranged in an annular shape and fitted with the frame 5, the tolerances of the cores are piled up, and the core 3 must follow the frame 5 with high accuracy. For this reason, there is a problem that a gap is formed between the core 3 and the frame 5 and the fixing force is reduced, and vibration and noise are easily generated. However, even when the split core is not accurately along the perfect circle or the frame, vibration and noise can be reduced by filling the gap with resin. In general, the split core has a problem that the rigidity is lower than that of the integral core, but vibration and noise can be reduced even with a core having low rigidity.
Further, since the air layer between the stator core and the frame is eliminated, heat conduction is improved, motor cooling performance is improved, and motor performance can be improved.

As shown in FIGS. 1 and 2, the following configuration is applied to the rotating electrical machine in the first embodiment.
A plurality of stator cores 3 divided in the circumferential direction and a cylindrical frame 5 that holds the stator core 3 on the inner peripheral surface, and a gap as a resin-filled groove portion RC that fills the resin RS between the frame 5 and the stator core 3 8, wherein the gap 8 is provided in a part or all of the circumferential direction and the axial direction between the frame 5 and the stator core 3.
That is, it is composed of a plurality of stator cores 3 divided in the circumferential direction and a frame 5 that fixes and holds the stator core 3. A gap 8 is provided between the frame 5 and the stator core 3, and a part or all of the gap 8 is provided. The resin RS is filled.
The gap 8 is provided in the entire circumferential direction between the frame 5 and the stator core 3 and in a part in the axial direction, or in the axial direction between the frame 5 and the stator core 3. It is provided in a part of the circumferential direction.
With this configuration, even when the stator core 3 as a split core is not accurately along the frame 5, vibration and noise can be reduced by filling the gap with resin. The divided core has a problem that the rigidity is lower than that of the integral core, but the stator core 3 having low rigidity can reduce vibration and noise. Stator core 3 and frame 5 can be in close contact with each other, improving heat conduction and improving cooling performance. Motor performance is improved.

The rotating electrical machine in the first embodiment has the following configuration as shown in FIG.
The gap 8 as the resin filling groove RC is formed by a recess 5 a provided in the frame 5.
With this configuration, the vibration and noise can be reliably reduced by the resin RS filled in the gap 8 as the resin filling groove RC formed by the recess 5 a provided in the frame 5.

Embodiment 2. FIG.
A rotating electrical machine composed of a motor in the second embodiment will be described with reference to FIG. 3A is a partial cross-sectional view of the motor according to the second embodiment, and FIG. 3B is a partial plan view.

A resin-filled groove portion RC including a gap 8 is formed between the frame 5 and the stator core 3, and penetrates the resin-filled groove portion RC in the axial direction of the stator core 3. The resin filling groove portion RC may be provided in either the frame 5 or the stator core 3.
By providing the resin filling groove portion RC penetrating in the axial direction of the stator core 3, the resin RS can be easily filled and vibration can be suppressed over the entire axial direction of the stator core 3. In addition, in the manufacturing process of a rotating electrical machine composed of a motor, casting can be performed from either the axial direction of the motor, and productivity is good.

As shown in FIG. 3, the rotating electrical machine in the second embodiment has the following configuration in the configuration in the first embodiment.
A plurality of stator cores 3 divided in the circumferential direction and a cylindrical frame 5 that holds the stator core 3 on the inner peripheral surface, and a resin filling groove RC that fills the resin RS between the frame 5 and the stator core 3. A gap 8 is provided, and the gap 8 is provided in a part or all of the circumferential direction and the axial direction between the frame 5 and the stator core 3, and between the frame 5 and the stator core 3. The resin filling groove RC composed of the provided gap 8 for filling the resin RS penetrates in the axial direction and is provided in a part or all of the circumferential direction between the frame 5 and the stator core 3. To do.
With this configuration, it is possible to suppress the vibration of the stator core 3 over the entire axial direction of the rotating electrical machine including the motor. Moreover, in the manufacturing process of the rotary electric machine which consists of a motor, resin RS can be cast from either of a motor axial direction, and a manufacturing process can be made efficient.

The rotating electrical machine in the second embodiment has the following configuration as shown in FIG.
The gap 8 as the resin-filled groove portion RC is formed by a recess 3 b provided in the stator core 3.
With this configuration, vibration and noise can be reliably reduced by the resin RS filled in the gap 8 as the resin filling groove RC formed by the recess 3b provided in the stator core 3.

Embodiment 3 FIG.
A rotating electrical machine including a motor according to Embodiment 3 will be described with reference to FIGS. 4 and 5. 4 and 5 are partial cross-sectional views of the motor in the third embodiment.

In the third embodiment, the resin-filled groove portion RC including the gap 8 is formed from the upper portion of the stator core 3 to the middle of the stator core 3 in the axial direction. By doing so, leakage of the filled resin RS can be prevented in the manufacturing process of the rotating electrical machine made of a motor, and the production becomes easy.
Further, in FIG. 5, the resin filling groove RS is formed not on the stator core 3 side but on the fixed side of the frame 5. By doing so, it is possible to suppress the vibration of the stator core 3 from being transmitted to another part.
The frame 5 has a mounting flange 5b formed with a metal pressing process such as drawing at the end in the axial direction and provided with a mounting hole 5c. The resin-filled groove RS corresponds to the mounting flange 5b. Provided. The attachment flange 5b is used to attach and fix the frame 5 to a fixed part.

As shown in FIGS. 4 and 5, the rotating electrical machine in the third embodiment has the following configuration in the configuration in the first embodiment.
A plurality of stator cores 3 divided in the circumferential direction and a cylindrical frame 5 that holds the stator core 3 on the inner peripheral surface, and a resin filling groove RC that fills the resin RS between the frame 5 and the stator core 3. A gap 8 is provided, and the gap 8 is provided in a part or all of the circumferential direction and the axial direction between the frame 5 and the stator core 3. The gap 8 filled with the resin provided therebetween is provided in a part of the stator core from one end in the axial direction to the middle in the axial direction, and a part in the circumferential direction between the frame 5 and the stator core 3. Or it is provided in all.
With this configuration, in the manufacturing process of the rotating electrical machine including the motor, if the resin RS is injected into the gap 8 from one end of the stator core 3, the filled resin RS does not sag and productivity can be improved.

Further, in the configuration of the preceding paragraph, the gap 8 as the resin filling groove RC provided between the frame 5 and the stator core 3 has a mounting hole 5c for fixing the frame 5 to a fixing portion, and one end of the stator core 3 The resin RS is filled with the gap 8 as the resin filling groove RC, which is formed by the recess 5a provided in the frame 5 fixed at a position corresponding to the above.
In other words, the gap 8 between the frame 5 and the stator core 3 is provided not on the stator core 3 side but on the fixed side of the frame 5.
With this configuration, it is possible to suppress the vibration generated in the stator of the rotating electrical machine including the motor from propagating from the motor fixing portion to another part.

Embodiment 4 FIG.
A rotating electrical machine including a motor according to Embodiment 4 will be described with reference to FIG. FIG. 6 is a partial cross-sectional view of the motor in the fourth embodiment.

In the fourth embodiment, the resin-filled groove portion RC including the gap 8 is provided partway in the axial direction of the stator core 3, and the frame 5 has a thick portion 5 d at a position corresponding to the gap 8 in the axial direction.
By doing so, thinning of the frame 5 due to the provision of the gap 8 can be avoided, the rigidity of the stator 2 as a whole can be prevented from being lowered, and vibrations in the stator 2 can be suppressed.

As shown in FIG. 6, the rotating electrical machine in the fourth embodiment has the following configuration in the configuration in the third embodiment.
The frame 5 has a thick portion 5d at a position corresponding to the gap 8 in the axial direction.
With this configuration, it is possible to avoid the thinning of the frame 5 due to the provision of the gap 8, to prevent a reduction in the rigidity of the entire stator 2 in the rotating electrical machine including the motor, and to suppress vibration and noise.

Embodiment 5 FIG.
A rotating electrical machine including a motor according to Embodiment 5 will be described with reference to FIGS. FIG. 7 shows the overall configuration of the motor according to the fifth embodiment. FIG. 7 (a) shows a partial sectional view, and FIG. 7 (b) shows a perspective view. FIG. 10 is a graph comparing the vibration response characteristics of the conventional motor and the motor according to the fifth embodiment.

Resin RS is continuously filled between the frame 5 and the stator core 3 in the circumferential direction. The holder 7 and the frame 5 are opposed to each other with a predetermined interval, and a gap 8a is also formed between the holder 7 and the frame 5. The gap 8a is also filled with resin.
A mounting flange 5b is integrally formed at the end of the frame 5 in the axial direction, and a gap 8a communicating with the gap 8 is formed between the mounting flange 5b and the holder 7 to form the resin-filled groove portion RC. The resin RS is continuously filled in the gap 8 and the gap 8a.

  At the same time, the vibration resistance of the holder 7 and the bus bar 6 can be improved by filling the space between the holder 7 and the holder 7. The vibration resistance of the entire holder 7 can be improved by continuously filling the resin RS in an annular shape.

For example, if a resin containing a silicone component is used as the resin RS, the material is relatively flexible, so that it is difficult to receive stress due to thermal deformation. Therefore, it is effective when the gap that is easily affected by thermal stress is large.
Further, the resin RS may be an epoxy resin having an epoxy-based component. An epoxy material made of an epoxy resin has a relatively high material hardness and is effective in suppressing high-frequency vibrations. For example, a resin to be applied for fixing the coil such as varnish may be filled between the frame and the stator core.

As shown in FIG. 7, the rotating electrical machine according to the fifth embodiment has the following configuration applied to any of the configurations according to the first to fourth embodiments described above.
A bus bar 6 for supplying power to the coil 4 wound around the stator core 3 and a holder 7 fixed to the frame 5 and holding the bus bar 6 are provided, and a gap 8a is provided between the frame 5 and the holder 7. The resin RS is filled in the gap 8 constituting the resin filling groove RC between the frame 5 and the stator core 3 and the gap 8a between the frame 5 and the holder 7. The gap 8a communicates with the resin-filled groove RC formed by the gap 8, and the gap 8a constitutes the resin-filled groove RC integrally with the gap 8.
That is, a plurality of stator cores 3 that are divided in the circumferential direction, a frame 5 that holds the stator core 3 on its inner peripheral surface, teeth 3 a that protrude on the inner peripheral side of the stator core 3, and an end surface of the stator core 3 are provided. A coil 4 wound around the teeth via an insulator made of an insulating member, a plurality of bus bars 6 made of a conductive material for connecting a terminal of the coil 4 and a power feeding portion, and the plurality of the plurality of bus bars 6 It is comprised with the holder 7 which consists of an insulating material which fixes or accommodates the bus bar 6 integrally, resin RS is continuously filled with the stator circumferential direction, and the holder 7 and the flame | frame 5 have a predetermined spacing. The resin RS is also filled in the gap 8a between the holder 7 and the frame 7.
With this configuration, the holder 7 and the bus bar 6 can be isolated from each other while suppressing noise, and the vibration isolation is improved.

Further, in any one of the configurations from the first embodiment to the fourth embodiment described above or the configuration of the previous item, the resin filled in the gaps 8 and 8 is a silicone resin.
With this configuration, since the material is relatively flexible, it is not easily affected by thermal deformation. This is particularly effective when the gap is large and is susceptible to thermal deformation.

In any one of the configurations from the first embodiment to the fourth embodiment described above or the configuration in the preceding paragraph, the resin filled in the gap 8 is an epoxy resin.
With this configuration, the material hardness is higher than that of the silicone system, and higher frequency vibrations can be suppressed (see FIG. 10).

Embodiment 6 FIG.
A rotating electrical machine including a motor according to Embodiment 6 will be described with reference to FIG. FIG. 8 is a perspective view of the motor according to the sixth embodiment.
Resin filled groove portions RC as the gaps 8 are provided in the stator core 3, and the resin RS is filled at equal intervals in the circumferential direction.
If the resin filling groove portion RC as the gap 8 is provided on the stator core 3 side, the resin filling groove portions RC can be arranged at equal intervals, and the productivity when applying the resin RS is improved. Further, the shape of the frame 5 can be simplified and the processing becomes easy.

As shown in FIG. 8, the rotating electrical machine in the sixth embodiment has the following configuration applied in any of the configurations in the first to fifth embodiments described above.
The gaps 8 forming the resin filling groove RC filling the resin RS are provided at equal intervals in the circumferential direction of the stator 2, and the gaps 8 forming the resin filling groove RC are filled with the resin RS. With this configuration, a recess can be provided on the divided core 3 side, and the processing of the frame 5 is facilitated. Further, the resin filling groove portions RC can be arranged at equal intervals, and the productivity of the resin coating process is improved.

Embodiment 7 FIG.
A rotating electrical machine including a motor according to Embodiment 7 will be described with reference to FIG. FIG. 9 is a partial cross-sectional view of the motor according to the seventh embodiment.
The resin-filled groove portion RC formed by the gap 8 between the frame 5 and the stator core 3 is formed by a curved surface portion AS formed by an R portion 9 formed between the mounting flange 5b of the frame 5 and the stator fitting portion. The mounting flange 5b is formed by forming one end portion of the cylindrical frame 5 in the axial direction by metal pressing such as drawing, and has a curved surface formed by an R portion 9 at the edge of the inner peripheral surface of the frame 5. A portion AS is formed, and a region surrounded by the curved surface portion AS composed of the R portion 9, the side surface of the stator core 3, and the lower surface of the holder 7 forms a resin-filled groove portion RC. Is to be filled.
The R portion 9 as the curved surface portion AS cannot be fitted to the stator core 3 and cannot hold the stator core 3, but can be held by filling the resin RS, and the rigidity of the stator 2 can be improved and vibration can be suppressed.

As shown in FIG. 9, the rotating electrical machine in the seventh embodiment has the following configuration in the configuration in the first embodiment described above.
At one end of the frame 5, a mounting flange 5 b is formed integrally with the frame 5, and the gap 8 filling the resin RS is curved at the edge of the inner peripheral surface at one end of the frame 5. It is characterized by comprising between the surface portion AS and the stator core 3.
That is, a resin-filled groove portion RC that includes a plurality of stator cores 3 divided in the circumferential direction and a cylindrical frame 5 that holds the stator core 3 on the inner peripheral surface, and that fills the resin RS between the frame 5 and the stator core 3. The gap 8 is provided in a part or all of the circumferential direction and the axial direction between the frame 7 and the stator core 3, and the shaft in the cylindrical frame 5 is provided. At one end in the direction, a mounting flange 5b is formed integrally with the frame 5 by metal pressing such as drawing, and the gap 8 for filling the resin is a curve formed on the inner peripheral surface at one end of the frame 5. The surface portion AS is configured between the R portion 9 and the stator core 3.
That is, the gap 8 between the frame 5 and the stator core 3 is characterized in that it is constituted by a curved surface portion AS including an R portion 9 formed between the fitting portion between the frame mounting flange 5b and the stator core 3.
With this configuration, the curved surface portion AS composed of the R portion 9 cannot be fitted to the stator core 3 and cannot hold the stator core 3, but filling the resin RS increases the holding range of the stator core 3 and can suppress vibration.

  It should be noted that the disclosed matters as the technical idea in this application can be freely combined with each other within the technical scope, and each embodiment can be appropriately modified or omitted.

1 motor, 2 stator, 3 stator core, 3a teeth, 3b recess, 4 coil, 5 frame, 5a recess, 5b mounting flange, 5c mounting hole, 5d thick part, 6 bus bar, 7 holder, 8 clearance, 9 R part, RS resin, RC resin filling groove part, AS curved surface part.

Claims (12)

A plurality of stator cores divided in the circumferential direction, a frame for holding the stator core on an inner peripheral surface, a bus bar for supplying power to a coil wound around the stator core, and a holder fixed to the frame for holding the bus bar When, a rotary electric machine that includes a tree fat filling groove provided between said frame stator core, wherein said bus bar holder is attached to a mounting flange formed at one end of said frame, said The rotating electric machine is characterized in that the resin-filled groove portion is provided in a part or all of the space between the inner peripheral surface of the frame and the outer peripheral surface of the stator core, and the resin-filled groove portion is filled with resin.   2. The rotating electrical machine according to claim 1, wherein the resin-filled groove portion is provided in the entire axial direction and a part in the circumferential direction between the frame and the stator core.   The rotating electrical machine according to claim 2, wherein the resin-filled groove is formed by a recess provided in the frame.   The rotating electrical machine according to claim 2, wherein the resin-filled groove is formed by a recess provided in the stator core.   2. The resin-filled groove portion is provided in a part in the axial direction from one end of the stator core, and is provided in a part or all of the circumferential direction between the frame and the stator core. The rotating electrical machine described in 1.   The rotating electrical machine according to claim 5, wherein the resin-filled groove is formed by a recess provided in the frame.   The rotating electric machine according to claim 6, wherein the frame has a thick portion at a position corresponding to the resin-filled groove portion in the axial direction.   The rotating electrical machine according to claim 1, wherein a resin is filled between the frame and the holder.   The rotating electrical machine according to any one of claims 1 to 8, wherein the resin filled in the resin-filled groove portion is a silicone resin.   The rotating electrical machine according to any one of claims 1 to 8, wherein the resin filled in the resin-filled groove portion is an epoxy resin.   The rotating electrical machine according to claim 1, wherein the resin-filled groove portions are provided at equal intervals in a circumferential direction of the stator core.   2. The rotating electrical machine according to claim 1, wherein the resin-filled groove portion is configured between a curved surface portion formed on an inner peripheral surface of the mounting flange at one end of the frame and the stator core.

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