JP2010136467A - Stator core for motor, and motor containing it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator core which improves vibration-damping effect, without deteriorating a dimensional accuracy in a supporting face, where a stator core is supported, in a stator core for a motor. <P>SOLUTION: The stator core 10 includes a stack 30 which is constituted by stacking a plurality of electromagnetic steel plates 20. The electromagnetic steel plate 20 includes an inner perimetrical face 21 and a peripheral face 22, and a part of the peripheral face 22 constitutes the supporting face 23. The supporting face 23 is a region for a housing to support the stack 30. Though an adhesive layer 40 includes a peripheral adhesive layer 42 formed on the peripheral face 22, the peripheral adhesive layer 42 is not formed on the supporting face 23. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a stator core of a motor and a motor including the same, and more particularly to a structure of an electromagnetic steel plate constituting the stator core.

  As a configuration of a motor used for an electric compressor or the like, a configuration in which a stator core is inserted into a housing and fixed and supported by the housing from the outside via a support surface of the stator core is well known. This support structure is realized by, for example, shrink fitting or press fitting. An example of such a configuration is shown in Patent Document 1.

JP 2006-115581 A

By the way, as a method of manufacturing a stator core of a motor, a method of stacking and fixing electromagnetic steel plates constituting the stator core is known. Examples of the fixing method include a method using an adhesive electromagnetic steel sheet and a method of forming an adhesive layer on the surface of a laminate of electromagnetic steel sheets.
The bonded electromagnetic steel sheet is obtained by applying an adhesive to the entire surface of the electromagnetic steel sheet in advance and bonding the electromagnetic steel sheet with this adhesive. In this method, since the heat-resistant temperature of the adhesive is insufficient, the electromagnetic steel sheet cannot be subjected to strain relief annealing, and is not appropriate for use in manufacturing a stator core for an electric compressor, for example.
On the other hand, a method of forming an adhesive layer on the surface of a laminate of electromagnetic steel sheets is by applying an adhesive or electrodeposition, and these can be applied to manufacture a stator core of an electric compressor. For example, as shown in FIG. 5, the adhesive layer 110 is formed on the surface of the electromagnetic steel sheet 100. Here, although the electromagnetic steel plate 100 is supported by the housing via the support surface 101, the dimensional accuracy of the support surface 101 deteriorates if the adhesive layer 110 is left on the support surface 101 as shown in FIG. The adhesive layer 110 on the support surface 101 may be removed by cutting or the like.

However, the conventional technique has a problem in that the fixing force between the electromagnetic steel sheets is reduced by removing the adhesive layer on the support surface, and the vibration isolation effect is reduced.
Such a reduction in the vibration-proofing effect is a problem that generally occurs in motors, but it is particularly noticeable in motors that are used in air conditioners for vehicles and electric compressors that include a compressor and that are relatively small and have a high rotational speed. It becomes.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a stator core that improves the vibration isolation effect without deteriorating the dimensional accuracy of the support surface. Moreover, it aims at providing the motor containing such a stator core.

A stator core of a motor according to the present invention includes: a laminated body configured by laminating a plurality of electromagnetic steel sheets; and an adhesive layer that is formed on a surface of the laminated body and fixes the plurality of electromagnetic steel sheets to each other. Has a void portion, and the void portion is provided at a position corresponding to the support surface on which the laminate is supported, and at least a part of the surface of the laminate that forms the void portion is bonded by the adhesive layer. The
This stator core has a gap at a position corresponding to the support surface of the laminate, and the magnetic steel sheets are bonded to each other by the adhesive layer around the gap, so that the fixing force is improved and the vibration isolation effect is increased.

The size of the angle occupied by the air gap viewed from the center point on the plane perpendicular to the axis of the laminate is larger than the size of the angle occupied by the support surface viewed from the center point on the plane perpendicular to the axis of the stack. According to such a configuration, even if the adhesive layer on the support surface is removed, the fixing layer can provide a fixing force that compensates for this, so that the fixing force can be maintained.
Here, the center point means the center point when the laminate is annular, and means the center of gravity when the laminate is polygonal.
The laminate may be supported by shrink fitting via the support surface. According to such a configuration, the laminate can be supported more firmly, particularly when the dimensional accuracy of the support surface is high.
The electromagnetic steel sheet may be formed in an annular shape, and may include an inner peripheral surface and an outer peripheral surface, and a part of the outer peripheral surface may constitute a support surface. Further, the gap may be provided so that the distance to the outer peripheral surface is smaller than the distance to the inner peripheral surface. According to such a configuration, the fixing force of the gap provided in the vicinity of the support surface on the outer peripheral surface can be made more effective.
The adhesive layer may be provided on at least one of the outer peripheral surface and the void portion over the entire angle of the laminate as viewed from the center point on the plane perpendicular to the axis of the laminate. According to such a configuration, a fixing force can be generated over the entire angle of the laminate.
The support surface may be an exposed surface that is not bonded by the adhesive layer. According to such a configuration, the dimensional accuracy of the support surface can be maintained without deteriorating while obtaining a high fixing force as described above.
The whole part which forms a space | gap part among the surfaces of a laminated body may be adhere | attached by the contact bonding layer. According to such a configuration, the fixing force in the gap can be further increased.
The gap may be a closed hole. According to such a configuration, it is possible to avoid a decrease in strength of the laminate around the gap.

A motor according to the present invention includes the above-described stator core, a housing that supports the stator core, a coil wound around the stator core, and a rotor accommodated in the stator core.
In this motor, the stator core has a gap at a position corresponding to the support surface of the laminate, and the electromagnetic steel sheets are bonded to each other around the gap by the adhesive layer, so that the fixing force is improved and the entire motor is prevented. Increase the vibration effect.

  In the stator core according to the present invention, the electromagnetic steel sheet has a gap at a position corresponding to the support surface, and at least a part of the portion forming the gap is bonded by the adhesive layer. The fixing force of the laminate can be supplemented. For this reason, a decrease in the fixing force between the electromagnetic steel sheets is suppressed, and as a result, the vibration isolation effect of the stator core is improved.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
Embodiment 1 FIG.
FIG. 1 is a cross-sectional view illustrating the configuration of a stator core 10 according to Embodiment 1 of the present invention. This cross-sectional view is based on a plane perpendicular to the motor axis (that is, the axis of the stator core 10). This stator core 10 is used for a motor of an electric compressor, for example.
Stator core 10 includes a laminate 30 formed by laminating a plurality of electromagnetic steel plates 20. Here, the electromagnetic steel plates 20 are laminated in the axial direction of the stator core 10 (that is, the front and back directions in FIG. 1), and the cross section of the laminate 30 shown in FIG. Become.

  The electromagnetic steel plate 20 is formed in an annular shape and includes an inner peripheral surface 21 and an outer peripheral surface 22. A part of the outer peripheral surface 22 constitutes a support surface 23. The support surface 23 is a housing (not shown in FIG. 1 and described later with reference to FIG. 3) provided on the outer side of the outer peripheral surface 22 for supporting the laminated body 30 (that is, supporting the stator core 10). It is an area. The outer peripheral surface 22 forms a substantially cylindrical surface, but the diameter of the support surface 23 of the outer peripheral surface 22 is larger than the diameter of the other portions of the outer peripheral surface 22, and thus the support surface 23 protrudes. .

In this example, three support surfaces 23 are provided at equal intervals in the circumferential direction of the electromagnetic steel sheet 20, and each interval is 120 degrees.
In addition, the inner peripheral surface 21 of the electromagnetic steel plate 20 constitutes a tooth that supports a coil wound around the stator core 10.
In this example, all of the electromagnetic steel plates 20 constituting the stator core 10 have the same shape, and therefore all of the electromagnetic steel plates 20 have the cross-sectional shape shown in FIG.

FIG. 2 shows an enlarged view of the periphery of the support surface 23 in FIG. Although only one support surface 23 is shown in FIG. 2, the shape of FIG. 2 and the following description apply similarly to all the support surfaces 23.
The electromagnetic steel sheet 20 has a gap 24. The gap 24 has a circular arc shape having a width, and is provided at a position corresponding to the support surface 23, for example, immediately inside the support surface 23. Here, the part which forms the space | gap part 24 among the surfaces of the electromagnetic steel plate 20 (or laminated body 30) is set as the space | gap surface 25. FIG. The void portion 24 is a closed hole surrounded by the void surface 25. That is, the gap surface 25 is not continuous with the inner peripheral surface 21 and the outer peripheral surface 22. Further, the gap portion 24 is a hole that penetrates the electromagnetic steel sheet 20 in the axial direction (that is, the front and back direction in FIG. 2).

An adhesive layer 40 is formed on the surface of the electromagnetic steel sheet 20, that is, on the surface of the laminate 30. The adhesive layer 40 includes an inner peripheral adhesive layer 41 formed on the inner peripheral surface 21, an outer peripheral adhesive layer 42 formed on the outer peripheral surface 22, and a void adhesive layer 45 formed on the void surface 25. .
The adhesive layer 40 fixes the laminated electromagnetic steel sheets 20 to each other. The adhesive layer 40 may be formed by any method as long as it has an effect of fixing the electromagnetic steel sheets 20 to each other. For example, the adhesive layer 40 can be formed by applying an adhesive to the surface of the laminate 30. . Alternatively, the adhesive layer 40 can be formed by performing electrodeposition coating on the surface of the laminate 30. Note that the thickness of the adhesive layer 40 shown in FIG. 2 is an illustrative example, and the actual thickness may be different from this.

  The entire inner peripheral surface 21 is bonded by an inner peripheral adhesive layer 41. Similarly, the entire gap surface 25 is bonded by the gap adhesive layer 45. Thereby, the electromagnetic steel plates 20 are fixed to each other. Regarding the outer peripheral surface 22, the entire portion other than the support surface 23 formed as a part of the outer peripheral surface 22 is bonded by the outer peripheral adhesive layer 42, but the outer peripheral adhesive layer 42 is not formed on the support surface 23. That is, the support surface 23 is an exposed surface and is a surface that is not bonded by the adhesive layer. Thus, by not providing the adhesive layer on the support surface 23, the dimensional accuracy of the support surface 23 can be maintained as in the prior art.

  In the stator core 10, the size of the angle θ <b> 2 occupied by the gap 24 as viewed from the center point O in the plane perpendicular to the axis of the stacked body 30 is the support surface as viewed from the center point O in the plane perpendicular to the axis of the stacked body 30. 23 is larger than the angle θ1. Further, the angle θ2 occupied by the gap 24 covers the entire angle θ1 occupied by the support surface 23. That is, the adhesive layer 40 has at least one of the outer peripheral surface 22 and the void portion 24 (void surface 25) over the entire angle (360 degrees) of the laminate 30 as viewed from the center point O on the plane perpendicular to the axis of the laminate 30. Is formed. In other words, at least one of the outer peripheral adhesive layer 42 and the void adhesive layer 45 is formed over the entire angle (360 degrees) of the stacked body 30.

  Here, as described above, since the outer peripheral adhesive layer 42 is not formed on the support surface 23 that occupies the angle θ1 in the outer peripheral surface 22, the fixing force between the electromagnetic steel sheets 20 may decrease as it is, and the vibration isolation effect may decrease. There is. However, since the void adhesive layer 45 is formed on the void surface 25 that occupies the angle θ2 including the entire angle θ1, the void adhesive layer 45 instead provides the fixing force that the outer peripheral adhesive layer 42 should originally provide. It will be provided and the fixing force can be supplemented. Alternatively, a decrease in fixing force can be suppressed by the presence of the gap adhesive layer 45. As a result, the stator core 10 according to the first embodiment can improve the overall vibration isolation effect.

  The gap 24 is provided in the vicinity of the outer peripheral surface 22. That is, the gap 24 is provided such that the distance d1 with the outer peripheral surface 22 is smaller than the distance d2 with the inner peripheral surface 21. With such a configuration, the fixing force can be supplemented at a position closer to the support surface 23.

  In the first embodiment described above, the gap adhesive layer 45 is formed on the entire gap surface 25, thereby bonding the magnetic steel sheets 20. As a modification, the gap adhesive layer is formed only on a part of the gap surface 25 and may not be formed on other parts. For example, it may be formed only on a part constituting a portion closer to the outer peripheral surface 22. Even in such a configuration, if the gap adhesive layer 45 is formed at least in part of the angle θ1 occupied by the support surface 23, the adhesive layer of the support surface 23 is removed, and the gap adhesive layer is formed in the gap portion 24. As compared with the case where 45 is not formed, a high anti-vibration effect can be obtained.

In the first embodiment, the gap 24 is a closed hole, but may be a gap that is not closed as a modification. Such a modification is applied to an embodiment in which a decrease in strength of the electromagnetic steel sheet 20 can be tolerated to some extent, for example. The shape of the gap may be, for example, a slit-like or slit-like gap continuous with the outer peripheral surface 22. With such a configuration, it is possible to more easily form an adhesive layer (for example, application of an adhesive or electrodeposition coating) in the gap.
Moreover, in Embodiment 1, although the electromagnetic steel plate 20 was formed in cyclic | annular form, not only this but a polygonal shape may be sufficient. The center point in the case of a polygonal shape means an emphasis.

Embodiment 2. FIG.
Embodiment 2 shows the configuration of a motor used in an electric compressor or the like. This motor includes the stator core 10 according to the first embodiment.
FIG. 3 is a cross-sectional view showing the configuration of the motor according to Embodiment 2 of the present invention. The motor includes a stator core 10 and a housing 50. The stator core 10 is inserted into the housing 50 and is fixed and supported by the housing 50. Here, the stator core 10 is inserted into the housing 50 in, for example, a shrink fitting process, but may be inserted by other methods such as press fitting. The stator core 10 is supported by the housing 50 via the support surface 23, but as described in the first embodiment, no adhesive layer is formed on the support surface 23.

  The motor also includes a coil 60. The coil 60 is wound around the stator core 10 by, for example, the same method and configuration as before. Further, the motor includes a rotor 70. The rotor 70 is accommodated in the stator core 10 by, for example, the same method and configuration as before.

  Since the motor according to the second embodiment includes the stator core 10 having the high vibration isolation effect according to the first embodiment, the vibration isolation effect can be improved as a whole of the motor.

Embodiment 3 FIG.
The third embodiment is an example of a method for manufacturing the stator core 10 according to the first embodiment.
FIGS. 4A to 4C are diagrams showing configurations of the electromagnetic steel sheet 20 and the adhesive layer 40 at different points in the method for manufacturing the stator core 10. The process proceeds in the order of (a), (b), and (c). FIG. 4 illustrates a part of the process according to the present invention, and a part of the process included in the conventional method of manufacturing a stator core is omitted.
FIG. 4A shows a process of preparing the electromagnetic steel sheet 20. The inner peripheral surface 21, the outer peripheral surface 22, the support surface 23 that is a part of the outer peripheral surface 22, and the gap portion 24 are formed by punching or the like, for example. Thereafter, the electromagnetic steel plates 20 are laminated to form the laminated body 30.

FIG. 4B shows a step of forming the adhesive layer 40 on the surface of the laminate 30. An inner peripheral adhesive layer 41, an outer peripheral adhesive layer 42, and a void adhesive layer 45 are formed on the inner peripheral surface 21, the outer peripheral surface 22, and the void surface 25, respectively. The adhesive layer 40 is formed by, for example, applying an adhesive, but this may be formed by electrodeposition coating or may be formed by other well-known techniques.
At this time, the outer peripheral adhesive layer 42 is also formed on the support surface 23, and the support surface 23 is not exposed.

  FIG. 4C shows a step of removing the outer peripheral adhesive layer 42 on the support surface 23. This is performed, for example, by cutting, whereby the support surface 23 is exposed. Thus, stator core 10 having a high vibration isolation effect according to Embodiment 1 is manufactured.

In the third embodiment, the support surface 23 is exposed by cutting in the step of FIG. 4C, but this may not be performed by cutting. For example, in the case where the stator core is press-fitted into the housing at the time of manufacturing the motor, when the portion formed on the support surface 23 of the outer peripheral adhesive layer 42 is peeled off by press-fitting, the independent support for exposing the support surface 23 is particularly provided. It is not necessary to provide a process. In this case, the step of press-fitting the stator core into the housing includes the step of removing a portion of the outer peripheral adhesive layer 42 formed on the support surface 23.
In Embodiment 3, the adhesive layer 40 is formed on the entire surface including the support surface 23 in the step of FIG. 4B. However, after masking the support surface 23, the adhesive layer 40 is applied to the surface of the laminate 30. 40 may be formed. In this case, it is not necessary to cut the support surface 23, and the support surface 23 is exposed by removing the masking of the support surface 23.

It is sectional drawing which shows the structure of the stator core which concerns on Embodiment 1 of this invention. It is an enlarged view of the periphery of the support surface in FIG. It is sectional drawing which shows the structure of the motor which concerns on Embodiment 2 of this invention. It is a figure explaining the method of manufacturing the stator core of FIG. It is a figure which shows the structure of the conventional stator core.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Stator core, 20 Magnetic steel plate, 21 Inner peripheral surface, 22 Outer peripheral surface, 23 Support surface, 24 Cavity part, 25 Cavity surface (part which forms a cavity part in the surface), 30 Laminated body, 40 Adhesive layer, 41 Inner circumference Adhesive layer, 42 outer peripheral adhesive layer, 45 gap adhesive layer, 50 housing, 60 coil, 70 rotor, O center point, angle occupied by θ1 support surface, angle occupied by θ2 gap, d1 distance between gap and outer circumference, d2 Distance between the gap and the inner peripheral surface.

Claims (10)

A stator core of a motor,
A laminate composed of a plurality of electromagnetic steel plates laminated;
An adhesive layer that is formed on the surface of the laminate and fixes the plurality of electrical steel sheets to each other;
The electromagnetic steel sheet has a gap,
The gap is provided at a position corresponding to a support surface on which the laminate is supported,
A stator core of a motor in which at least a part of a portion of the surface of the laminate that forms the gap is bonded by the adhesive layer. The size of the angle occupied by the gap as seen from the center point in the plane perpendicular to the axis of the laminate is larger than the angle of the angle occupied by the support surface as seen from the center point in the plane perpendicular to the axis of the laminate. The stator core of the motor according to claim 1, which is larger. 3. The motor stator core according to claim 1, wherein the laminate is supported by shrink fitting through the support surface. The electromagnetic steel sheet is formed in an annular shape, and includes an inner peripheral surface and an outer peripheral surface,
The stator core of the motor according to any one of claims 1 to 3, wherein a part of the outer peripheral surface constitutes the support surface.   The stator core of the motor according to claim 4, wherein the gap is provided such that a distance from the outer peripheral surface is smaller than a distance from the inner peripheral surface.   6. The motor according to claim 4, wherein the adhesive layer is provided on at least one of the outer peripheral surface and the gap portion over the entire angle of the laminate as viewed from a center point on a plane perpendicular to the axis of the laminate. Stator core.   The stator core of the motor according to any one of claims 1 to 6, wherein the support surface is an exposed surface that is not bonded by the adhesive layer.   The stator core of the motor according to any one of claims 1 to 7, wherein an entire portion of the surface of the laminate that forms the gap is bonded by the adhesive layer.   The stator core of the motor according to any one of claims 1 to 8, wherein the gap is a closed hole. The stator core according to any one of claims 1 to 9,
A housing that supports the stator core;
A coil wound around the stator core;
A motor including a rotor housed in the stator core.

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