JP7094378B2 - Rotating electric machine - Google Patents

Description

The present application relates to a rotary electric machine.

In the rotary electric machine, a stator is provided inside the annular frame, and the rotor is housed inside the stator through a gap. The core of the stator is divided into a plurality of parts and is provided on the inner peripheral side of the frame. This divided core (divided core) is manufactured by laminating a plurality of steel plates.

The fixing of the divided core between the steel plates is performed by caulking (Patent Documents 1 and 2). As shown in Patent Documents 1 and 2, this caulking is generally performed at two locations on the circumference of the steel plate in contact with the inner peripheral surface of the frame in which the split core is fitted and held, and the circumference thereof. One location is provided on the teeth portion that protrudes from the portion to the inner peripheral side, and the three points of caulking are arranged in a T shape so that they are accurately stacked so as to have the shape of a split core. Here, as this caulking, what is called V caulking is often used. The V-caulking provided at two locations on the circumference is oriented in the circumferential direction on the long side, and the V-caulking provided at one location on the teeth is directed in the radial direction on the long side to move the steel plate. The steel plate is fixed with high precision so as not to obstruct the flow of magnetic flux while regulating.

As shown in Patent Documents 1 and 2, a coil is wound around a tooth portion of a plurality of divided cores in which V caulking is arranged in a T shape. The plurality of split cores around which this coil is wound are fitted into the inside of the frame by press fitting.
In the rotary electric machine using this split core, noise due to slight vibration has been a problem.

Japanese Patent No. 3878368 Japanese Unexamined Patent Publication No. 2007-129835

The inventors have tried to increase the number of caulking and to strengthen the fixing between the steel plates by arranging caulking in various directions in order to prevent vibration in the split core in which multiple steel plates are laminated. Although it was improved to some extent, it was not possible to eliminate this vibration to the extent that it could be ignored.
As a result of further studies, it was considered that the cause was that the inner circumference of the frame and the laminated surface of the steel plate of the split core did not uniformly hit when the split core was press-fitted into the frame and fitted. That is, it was considered that the out-of-plane (out-of-plane (out-of-plane) rigidity of the entire stator including the frame and the dividing core was insufficient, and the deformation of the dividing core in the out-of-plane direction caused noise due to vibration.

Therefore, it was considered as a solution to increase the rigidity of the frame and to tighten it to the whole with a large tightening allowance for shrink fitting. The new problem was the increase in dimensions. Further, when tightening with a large force, iron loss or deformation of the split core in the locally tightened more than necessary has been a new problem.

The inventors investigated the cause of the local hit in the central part of the split core with respect to the frame, and understood that the direction of V caulking around the core is related to the deformation of the split core.
That is, in a conventional rotary electric machine, a plurality of steel plates are fixedly laminated in a split core, and when a coil is wound around the steel plate, the axial central portion of the outer periphery of the split core swells due to the tension at the time of winding. , So-called barrel-shaped shape. Therefore, when a plurality of V-caulks are used when laminating the steel plates, a problem of noise due to vibration arises.

From this relationship, a detailed examination of V-caulking revealed that the shape of V-caulking has two directions, a long side and a short side. It works a little. However, there is almost no movement in the perpendicular direction (short side direction). Therefore, as described above, in the case of V-caulking that is generally performed, the long side direction of the V-caulking of the circumferential portion of the split core is toward the circumferential direction. Even when tightened, the laminated steel plates do not move in the radial direction. It will be stretched to keep the barrel shape.

For this reason, the press-fitting contact state between the inner circumference of the frame and the outer circumference of the split core does not spread over the entire surface, but is a local contact, and the out-of-plane rigidity of the entire stator as described above is insufficient, and the contact is slight in places where the contact is not sufficient. Vibration was the cause of vibration noise.
An object of the present application is to provide a rotary electric machine capable of suppressing vibration noise caused by micro-vibration by making the inner circumference of the frame and the laminated surface of the steel plate of the split core uniformly in contact with each other.

The rotary electric machine of the present application includes a stator and a rotor, and the stator includes an annular frame and a plurality of split cores arranged in the circumferential direction inside the frame, and the split core is a caulking portion. It is composed of a laminate of a first steel plate and a second steel plate fixed by the above, and in the caulked portion , the first steel plate and the second steel plate have a gap and are positioned in the radial direction of the stator. It is characterized in that the first steel plate and the second steel plate are configured so as to be able to cause a displacement, and the first steel plate and the second steel plate are configured so as not to cause a displacement in the circumferential direction of the stator .

According to the rotary electric machine of the present application, the individual steel plates in which the split cores are laminated can move in the radial direction of the stator along the inner surface of the frame at the time of press fitting, so that the steel plates can be laminated in the entire laminating direction (core axial direction). Therefore, a good press-fitting contact state can be formed, and a rotary electric machine with low vibration and noise can be provided.

It is a perspective view which shows the structure of the split core of the rotary electric machine according to Embodiment 1. FIG. It is a top view from the axial direction of the stator which shows the relationship between the frame of the stator of a rotary electric machine, and the split core. It is a schematic block diagram which shows the structure of a rotary electric machine. It is sectional drawing in the radial direction of the caulked part of the split core according to Embodiment 1. FIG. It is sectional drawing in the circumferential direction of the caulking part of the split core according to Embodiment 1. FIG. It is a top view which shows the arrangement of the caulking part of the split core by Embodiment 2. FIG. It is a perspective view which shows the structure of the split core of the rotary electric machine according to Embodiment 3. FIG. It is sectional drawing in the radial direction of the caulked part of the split core according to Embodiment 3. FIG. It is sectional drawing in the circumferential direction of the caulking part of the split core according to Embodiment 3. FIG. It is a top view which shows the arrangement of the caulking part of the split core by Embodiment 4. FIG. It is sectional drawing of the state which wound the coil of the rotary electric machine according to Embodiment 5. It is sectional drawing of the state which wound the coil of the rotary electric machine according to Embodiment 6. It is a figure which shows the noise measurement result of the rotary electric machine of this application.

Embodiment 1
FIG. 1 is a perspective view showing a configuration of a split core of a rotary electric machine according to the first embodiment. As shown in the figure, the divided core 10 is configured by laminating a plurality of steel plates 11. The steel plates 11 are fixed to each other by a caulking portion 12 provided at one place on the teeth portion 14 of the steel plate 11.
As shown in FIG. 2, the split core 10 of the first embodiment is configured by combining the stator 20 of the rotary electric machine in an annular shape on the inner circumference of the annular frame 30, and the split core 10 is the frame 30. Is press-fitted or shrink-fitted into. The split core 10 receives pressure from the frame 30 so as to contract in the radial direction, and the adjacent split cores 10 are in contact with each other so as to be in balance with this pressure and are pulled in the circumferential direction to maintain the annular shape. FIG. 2 is a plan view of the stator of the rotary electric machine according to the first embodiment as viewed from the axial direction of the rotor. The coil wound around the split core 10 is not shown.
In the following figures, the same reference numerals indicate the same or corresponding parts.

The configuration of the rotary electric machine 100 is shown in FIG. 3. That is, the rotary electric machine 100 includes a stator 20 and a rotor 40, and the rotor 40 rotates about a rotating shaft 41. The stator 20 includes a split core 10, a centralized winding coil 50 wound around the split core 10, and an annular frame 30 that holds the split core 10.
The rotor 40 is supported by a bearing 42 so as to rotate about a rotation shaft 41. The magnet attached to the rotor 40 is not shown.

FIG. 4 is a cross-sectional view in the radial direction A of the caulked portion 12 for fixing the individual steel plates 11 to be laminated according to the first embodiment. As shown in this figure, the laminated steel plate 11 is provided with a crimped portion 12 having a V-shaped cross-sectional shape of the uneven portion of the crimped portion 12. A gap 13 is provided between the steel plates 11 in the radial direction A of the caulked portion 12. When a force is applied in the direction of the arrow F (the long side direction of the caulked portion 12) due to the existence of the gap 13, the steel plate 11 is relatively easy because the gap 13 exists and the bending rigidity is small. In addition, the position can be displaced in the radial direction A, that is, it is movable. Here, although the cross-sectional shape of the uneven portion of the caulked portion 12 is V-shaped, even if the cross-sectional shape of the uneven portion is U-shaped due to a smooth curve, the gap 13 is similarly formed. The same operation can be obtained by providing.

FIG. 5 is a cross-sectional view in the circumferential direction B of the caulked portion 12 for fixing the individual steel plates 11 to be laminated according to the first embodiment. As shown in this figure, there is no gap between the steel plates 11 in the circumferential direction B of the caulked portion 12. Therefore, the steel plates 11 cannot be displaced from each other in the circumferential direction B.
The short side direction of the caulked portion 12 as shown in FIG. 5 is fitted with a tightening margin on the punched surface, and the bending rigidity is also large, so that a very large force is required for the steel plate 11 to move.

As shown in FIGS. 4 and 5, the state of misalignment differs between the fixed state in the long side direction and the fixed state in the short side direction of the caulked portion 12. Therefore, as shown in FIG. 1, once the caulking portion 12 is provided at one of the teeth portions 14 of the steel plate 11 of the split core 10 so that the long side direction is the radial direction of the stator 20, once. When the centralized winding coil 50 is wound around the fixed and laminated steel plates 11 and the split core 10 having a barrel shape is press-fitted into the frame 30 for fitting, the individual steel plates 11 are fitted in the fitting process. A good contact state is formed between the two while following the inner peripheral surface of the frame 30.

The caulking portion 12 provided at one location on the teeth portion 14 of the split core 10 is provided within the range in which the centralized winding coil 50 of the teeth portion 14 is wound. Therefore, the centralized winding coil 50 can uniformly adjust the thickness of the laminated cores 10 without causing a large displacement of the steel plates 11 when the steel plates 11 are tightened in the stacking direction.

Embodiment 2
FIG. 6 shows the configuration of the second embodiment, in which the caulking portion 12 is provided on the circumferential portion 15 of the split core 10 in addition to the teeth portion 14 of the split core 10 with the longitudinal direction of the caulking portion 12 in the same direction. I'm adding. In the second embodiment, since the two caulking portions 12 are provided, the resistance to the movement of the steel plate 11 constituting the split core 10 increases, so that the "play" effect is slightly reduced. However, it is effective in increasing the number of caulking portions 12 to reduce the displacement of the steel plate during transportation of the split core 10.

Embodiment 3
FIG. 7 is a perspective view showing the configuration of the split core of the rotary electric machine according to the third embodiment. As shown in the figure, the split core 10 is configured by laminating a plurality of steel plates 11. The steel plates 11 are fixed to each other by the caulking portion 12. In FIG. 7, the caulked portion 12 is fixed by a round caulking having a circular planar shape. In the caulking of the split core 10 according to the third embodiment, the caulked portion 12 having an uneven cross-sectional shape is formed by a combination of a circle and an oval or an oval and an oval shape in a planar shape, and is fitted. By providing the portion and the gap 13, the movement of the laminated steel plates 11 is made anisotropic. That is, it is configured so that there is a difference in the state of misalignment between the long side direction and the short side direction of the caulked portion 12.

FIG. 8 shows a cross section of the caulked portion 12 in the long side direction. In FIG. 8, when a force is applied in the direction of the arrow F, the steel plates 11 can be slightly displaced from each other due to the gap 13 (play) composed of a circle and an ellipse or an ellipse. ing. On the other hand, in the cross section of the caulked portion 12 in the short side direction shown in FIG. 9, the steel plates 11 are fitted together. Therefore, the steel plates 11 cannot be displaced from each other in the circumferential direction B.
Although the specific shape is not shown, a combination of ellipses and ellipses may be used so that the short sides are fitted to each other and the long sides are configured to have "play".

Embodiment 4
The caulking portion 12 can be a circular round caulking portion, and the caulking portion 12 can be made into a plurality of caulking portions 12 in the same manner as in the second embodiment shown in FIG. That is, as shown in the plan view of the split core 10 in FIG. 10, in addition to the teeth portion 14 of the split core 10 shown in FIG. 7, the circumferential portion 15 of the split core 10 is crimped in the same longitudinal direction. 12 is additionally provided.

Embodiment 5
FIG. 11 shows a cross-sectional view when the split core 10 having the caulked portion 12 shown in the first and third embodiments of the present application is fitted to the frame 30. As shown in FIG. 11, the frame 30 has a jacket 61 on the outer peripheral side thereof, which forms a cooling water channel 60 for cooling the divided core 10. As shown in the figure, the laminated surface of the split core 10 and the inner peripheral surface of the frame 30 after fitting can form a sufficient contact state without a gap over the entire length in the axial direction of the split core 10. .. This is because, as described above, the long side direction of the caulked portion 12 of the split core 10 is the radial direction, and the gap 13 of the caulked portion 12 causes the individual steel plates 11 to follow the inner peripheral surface of the frame 30 in the fitting process. This is because they form a good contact state.

FIG. 12 shows a configuration similar to that of FIG. As shown in FIG. 6 or 10 as the second and fourth embodiments, the split core 10 used here is configured to have a plurality of caulking portions 12, so that the steel plate 11 is subjected to misalignment movement. It shows the correspondence when it becomes a resistance, that is, when the laminated surface of the steel plate 11 of the divided core 10 does not follow the surface of the frame 30 more than expected. That is, a gap is generated because the laminated surface of the steel plate 11 of the split core 10 and the frame 30 are not in a sufficiently imitated state.

In such a case, a resin portion 70 filled and coated with resin is provided in the gap portion between the laminated surface and the frame 30. By supplementing the action of the caulking portion 12 with the resin portion 70, vibration noise can be suppressed. This is because the caulking portion 12 is provided with a gap to facilitate the misalignment of the steel plates to be laminated, so that the amount of deformation is larger than in the conventional case and the gap between the frame 30 and the split core 10 is smaller. , The effect that it is sufficient to fill the resin slightly can be obtained.

FIG. 13 shows the measurement results of vibration noise performed to confirm the effect of the rotary electric machine of the present application. In the graph of this measurement result, the vertical axis represents the index of the noise level when the noise level of the prior art is 100, and the horizontal axis shows the motor rotation speed to be evaluated for noise, and the curve of the measurement result ( 1) shows the prior art, and the curve (2) is the measurement result of the noise in the case of the rotary electric machine according to the present application. As is clear from this result, the rotary electric machine using the stator of the split core provided with one caulking portion was able to significantly reduce the noise as compared with the rotary electric machine by the conventional technique.
Although the configuration is shown when the cross-sectional shape of the uneven portion of the caulked portion 12 is V-shaped, even if the cross-sectional shape of the uneven portion is U-shaped due to a smooth curve, the gap 13 is similarly formed. By providing it, the same operation can be obtained.

Although the present disclosure describes various exemplary embodiments and examples, the various features, embodiments, and functions described in one or more embodiments are applications of a particular embodiment. It is not limited to, but can be applied to embodiments alone or in various combinations.
Therefore, innumerable variations not exemplified are envisioned within the scope of the techniques disclosed herein. For example, it is assumed that at least one component is modified, added or omitted, and further, at least one component is extracted and combined with the components of other embodiments.

10 split cores, 11 steel plates, 12 caulking parts, 13 gaps, 14 teeth parts, 15 circumferential parts, 20 stators, 30 frames, 40 rotors, 41 rotating shafts, 42 bearings, 50 centralized winding coils, 60 cooling water channels, 61 jacket, 70 resin part, 100 rotary electric machine

Claims (7)

The stator comprises a stator and a rotor, the stator comprising an annular frame and a plurality of circumferentially arranged split cores inside the frame, wherein the split core is fixed by a caulking portion. The first steel plate and the second steel plate have a gap in the caulked portion, and the stator can be displaced in the radial direction. The rotary electric machine is configured as such, and the first steel plate and the second steel plate are configured so as not to cause a positional deviation in the circumferential direction of the stator . The caulked portion has a long side direction in the radial direction and a short side direction in the circumferential direction. In the caulked portion, the first steel plate and the second steel plate are arranged in the radial direction. There is a gap between them, there is no gap between the first steel plate and the second steel plate in the circumferential direction, and the first steel plate and the second steel plate are relatively in the radial direction. The rotary electric machine according to claim 1, wherein the rotary electric machine is configured to be movable. The rotary electric machine according to claim 1 or 2 , wherein the cross-sectional shape of the caulked portion is V-shaped or U-shaped. The planar shape of the caulked portion is a circle and an oval or an oval and an ellipse, and the gap is provided in the radial direction of the caulked portion provided on the first steel plate and the second steel plate. The rotary electric machine according to claim 1 or 2 , wherein the rotary electric machine is characterized in that. 3 . 4. The rotary electric machine according to 4. The rotary electric machine according to any one of claims 1 to 5, wherein the split core is press-fitted or shrink-fitted into the frame. The rotary electric machine according to claim 6 , wherein a resin portion is provided in a gap between the inner peripheral surface of the frame and the split core.

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