JP2012029494A - Electric motor and manufacturing method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric motor which restrains vibration at the time of actuation.SOLUTION: An electric motor comprises a starter core formed by laminating magnetic steel sheets 13. A room 15 is formed between the laminated magnetic steel sheets 13 along the outer shape of the magnetic steel sheets 13, and an adhesive region for adhering the laminated magnetic steel sheets 13 is formed closer to the side of an outer edge part 13a of the magnetic steel sheets 13 than the room 15.

Description

  The present invention relates to an electric motor.

  Conventionally, Patent Document 1 discloses a structure in which a plurality of electromagnetic steel plates are laminated as a stator core of an electric motor.

  In patent document 1, the rigidity of a stator core is made high by adhere | attaching the outer periphery parts of the electromagnetic steel plates to laminate | stack with an adhesive agent. Moreover, the vibration which arises at the time of the action | operation of an electric motor is suppressed by filling the clearance gap which arises between electromagnetic steel plates with an adhesive agent.

JP 2003-324869 A

  However, in the above invention, it is difficult to control the permeation range of the adhesive that permeates between the outer peripheral edges of the laminated magnetic steel sheets, and the adhesive may spread to a wider range than the desired adhesion region. When the bonding area is widened, there are fewer gaps between the laminated electrical steel sheets, and the effect of dissipating vibration due to friction between the electrical steel sheets generated in this gap is reduced, and on the contrary, the vibration is increased when the motor is operated. is there.

  The present invention was invented to solve such problems, and an object thereof is to suppress vibration during operation of an electric motor.

  An electric motor according to an aspect of the present invention is an electric motor including a stator core formed by stacking electromagnetic steel sheets, and a chamber formed between the stacked electromagnetic steel sheets and formed along the outer shape of the electromagnetic steel sheet. An adhesion region is formed on the outer edge side of the electromagnetic steel sheet with respect to the chamber, where the laminated electromagnetic steel sheets are adhered by an adhesive member.

  A method for manufacturing an electric motor according to another aspect of the present invention is a method for manufacturing an electric motor including a stator core formed by stacking electromagnetic steel sheets, and the outer shape of the electromagnetic steel sheets is aligned between the stacked electromagnetic steel sheets. A chamber is formed, the adhesive member is infiltrated from outside the chamber, and the laminated electrical steel sheets are bonded.

  According to the present invention, vibration during operation of the electric motor can be suppressed.

It is a lineblock diagram of the electric motor of a 1st embodiment of the present invention. It is II-II sectional drawing in FIG. It is a figure explaining the electromagnetic steel plate in 1st Embodiment. It is sectional drawing which shows a part of laminated | stacked electromagnetic steel plate in 1st Embodiment. It is a figure explaining the reduction effect of the vibration level in the electric motor of a 1st embodiment. It is a top view which shows a part of 1st electromagnetic steel plate in 2nd Embodiment. It is a top view which shows a part of 2nd electromagnetic steel plate in 2nd Embodiment. It is the top view which looked at the 1st electromagnetic steel plate and the 2nd electromagnetic steel plate from the lamination direction. It is IX-IX sectional drawing of FIG. It is a top view which shows a part of stator core in 3rd Embodiment. It is XI-XI sectional drawing of FIG. It is a top view which shows a part of 1st electromagnetic steel plate in 4th Embodiment. It is a top view which shows a part of 1st electromagnetic steel plate in 5th Embodiment. It is a top view which shows a part of 1st electromagnetic steel plate in 6th Embodiment. It is the top view which looked at the starter core in 7th Embodiment from the lamination direction. It is a top view of the 1st electromagnetic steel plate in a 7th embodiment. It is a top view of the 1st electromagnetic steel plate in an 8th embodiment. It is a figure explaining the 1st electromagnetic steel plate in a 9th embodiment. It is the enlarged view to which a part of FIG. 18 was expanded. It is a top view which shows a part of electromagnetic steel plate in 10th Embodiment. It is a top view of the electromagnetic steel plate in 11th Embodiment.

  The configuration of the first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a configuration diagram of an electric motor according to the present embodiment. FIG. 2 is a schematic cross-sectional view taken along the line II-II in FIG. In the present embodiment, an AC motor is described as an example, but the present invention is not limited to this, and a DC motor may be used.

  The electric motor 1 includes a shaft 2, a rotor 3 provided coaxially with the shaft 2, a stator 4 provided coaxially with the shaft 2, provided outside the rotor 3 in the radial direction of the shaft 2, and disposed outside the starter 4. And a provided case 5.

  The rotor 3 is an inner rotor that is attached to the shaft 2 and rotates integrally with the shaft 2 inside the stator 4. The rotor 3 includes a rotor core 6 formed by laminating thin steel plates 8 in the axial direction of the shaft 2, and a permanent magnet 7 embedded in the rotor core 6. The permanent magnet 7 is located on the outer peripheral side of the rotor 3 and is embedded along the axial direction of the shaft 2. Moreover, the permanent magnet 7 is embedded at a predetermined interval along the circumferential direction. By forming a rotor core 6 by laminating a plurality of thin steel plates 8, generation of eddy current can be suppressed.

  The stator 4 is a stator including a stator core 9 and a coil 10. When the stator 4 is viewed from the axial direction of the shaft 2, the outer peripheral shape of the stator 4 is circular. A case 5 is provided so as to cover this circular outer periphery.

  The stator core 9 includes a cylindrical yoke portion 11 and a plurality of teeth portions 12 that protrude from the inner wall of the yoke portion 11 toward the axis of the stator core 9. The stator core 9 is formed by laminating a plurality of plate-shaped electromagnetic steel plates 13 in the axial direction of the shaft 2 (axial direction of the stator core 9). Generation of eddy current can be suppressed by forming the stator core 9 by laminating a plurality of electromagnetic steel plates 13.

  The teeth portion 12 is provided at a predetermined interval along the circumferential direction of the yoke portion 11. The tip portion 12a of the tooth portion 12 faces the outer peripheral wall 3a of the rotor 3 with a predetermined air gap.

  Here, the electromagnetic steel sheet 13 forming the stator core 9 will be described with reference to FIG. FIG. 3 is a plan view of the electrical steel sheet.

  The electromagnetic steel plate 13 includes a groove 14 along the outer shape of the electromagnetic steel plate 13. The groove 14 is formed at a position away from the outer edge portion 13a of the electromagnetic steel plate 13 by a predetermined distance. The predetermined distance is set in accordance with the adhesion region 18 where the varnish is infiltrated and the laminated electromagnetic steel sheets 13 are adhered. The groove 14 is provided on one side or both sides of the electromagnetic steel sheet 13.

  When the electromagnetic steel plates 13 are laminated, a chamber 15 corresponding to the height of the groove 14 is formed between the laminated electromagnetic steel plates 13 as shown in FIG. FIG. 4 is a cross-sectional view showing a part of the laminated electromagnetic steel sheets 13.

  The laminated electromagnetic steel sheets 13 are bonded by a varnish (adhesive member) 16. The varnish 16 used here is a thermosetting resin varnish 16 that has good permeability at room temperature and cures when heated thereafter. In the laminated electromagnetic steel sheets 13, the varnish 16 permeates through a gap between the laminated steel sheets by a capillary phenomenon. Since the surface of the electromagnetic steel sheet 13 has minute irregularities, even when the electromagnetic steel sheets 13 are stacked in close contact, a slight gap is generated between the stacked electromagnetic steel sheets 13. The varnish 16 penetrates through this gap. And the laminated electromagnetic steel plates 13 adhere by heating the varnish 16.

  In this embodiment, since the groove | channel 14 is provided in the electromagnetic steel plate 13, the chamber 15 is formed between the laminated | stacked electromagnetic steel plates 13. As shown in FIG. Formation of the chamber 15 prevents the varnish 16 from penetrating beyond the chamber 15 due to surface tension due to capillary action. That is, the chamber 15 can prevent the varnish 16 from penetrating between the electromagnetic steel plates 13 inside the chamber 15, and the varnish 16 penetrates to the outer edge portion 13 a side rather than the chamber 15. Therefore, the adhesion region 18 is formed on the outer edge portion 13a side than the chamber 15.

  By providing the chamber 15 in this way, it is possible to control the region where the varnish 16 penetrates between the electromagnetic steel sheets 13.

  Returning to FIG. 1, the coil 10 is formed by winding an electric wire such as a copper wire around the tooth portion 12. An insulating member 17 is provided between the stator core 9 and the coil 10.

  The coil 10 is fixed by a varnish 16 so that the coil 10 is not unwound by the vibration generated during the operation of the electric motor 1 and the insulation with the stator core 9 is not impaired. Moreover, since the varnish 16 fixes the coil 10 and the stator core 9, the heat generated in the coil 10 during operation of the electric motor 1 is transmitted to the stator core 9, and the temperature rise of the coil 10 can be suppressed.

  Next, the effect | action in the electric motor 1 of this embodiment is demonstrated.

  When the rotor 3 is assembled to the stator 4 and a current is passed through the coil 10 of the stator 4, a magnetic path is formed by the relationship between the permanent magnet 7 embedded in the rotor 3 and the electromagnet of the stator 4. The attraction force by the permanent magnet 7 and the electromagnet changes temporally and spatially due to the temporal change of the electromagnet, and the rotor 3 and the shaft 2 rotate accordingly. At this time, vibration is generated in the stator 4 which is a stator. When the laminated electrical steel sheets 13 are not partially joined by caulking, for example, and are bonded with the varnish 16 as in this embodiment, friction occurs between the electrical steel sheets 13 and vibration is reduced. The

  Since the friction decreases as the adhesion area by the varnish 16 between the electromagnetic steel sheets 13 increases, the vibration reducing effect decreases. In this embodiment, by providing the chamber 15 in the vicinity of the outer edge portion 13a of the electromagnetic steel sheet 13, the varnish 16 can be prevented from penetrating beyond the chamber 15 and vibration can be reduced.

  In the present embodiment, the groove 14 is formed in the electromagnetic steel sheet 13, but a slit may be provided.

  The effect of 1st Embodiment of this invention is demonstrated.

  Here, the result of having compared the vibration level in the electric motor 1 using this embodiment and the electric motor which does not use this embodiment is shown in FIG. FIG. 5 is a diagram showing a vibration level which is a value obtained by dividing the frequency on the horizontal axis and the vibration acceleration on the vertical axis by the excitation input. The vibration level in the electric motor 1 of the present embodiment is indicated by a solid line, and the vibration level in an electric motor not using the present embodiment is indicated by a broken line. In addition, the electric motor which does not use this embodiment is an electric motor which adhere | attached the electromagnetic steel plate to laminate | stack on the whole surface with varnish.

  In the electric motor 1 using this embodiment, the maximum value (peak value) of the vibration level is smaller than that of the electric motor not using this embodiment, and the vibration level can be reduced.

  By providing the chamber 15 along the outer shape of the electromagnetic steel sheet 13, it is possible to prevent the varnish 16 penetrating from between the laminated electromagnetic steel sheets 13 from penetrating into the gap inside the chamber 15. It can prevent that the adhesion | attachment area | region 18 of the steel plate 13 becomes wide. Therefore, the vibration generated when the electric motor 1 is activated can be reduced.

  Further, by providing the chamber 15, an adhesion region by the varnish 16 can be determined, the rigidity of the stator core 9 can be made uniform, and the stress distribution can be made uniform when the stator 4 is inserted into the case 5. Can do. Therefore, the iron loss of the stator core 9 and the heat generation during the operation of the electric motor 1 can be made uniform. Further, plastic deformation of the stator core 9 due to stress concentration can be prevented.

  Next, a second embodiment of the present invention will be described.

  The present embodiment is different from the first embodiment in the electromagnetic steel sheet. In the following, a description will be given centering on differences from the first embodiment.

  In the present embodiment, the stator core is formed by alternately laminating two types of first electromagnetic steel plates 20 and second electromagnetic steel plates 21. Here, the 1st electromagnetic steel plate 20 is demonstrated using FIG. 6, and the 2nd electromagnetic steel plate 21 is demonstrated using FIG. FIG. 6 is a plan view showing a part of the first electromagnetic steel sheet 20. FIG. 7 is a plan view showing a part of the second electromagnetic steel plate 21.

  The first electromagnetic steel plates 20 are provided at predetermined intervals along the outer shape of the first electromagnetic steel plate 20, and are provided between the first slits 22 penetrating the first electromagnetic steel plate 20 and the adjacent first slits 22. And a first bridge portion 23. The second electromagnetic steel plate 21 is provided at predetermined intervals along the outer shape of the second electromagnetic steel plate 21 and provided between the second slit 24 penetrating the second electromagnetic steel plate 21 and the adjacent second slit 24. And a second bridge unit 25.

  Next, the first electromagnetic steel plate 20 and the second electromagnetic steel plate 21 are laminated, and a part of a plan view viewed from the first electromagnetic steel plate 20 side is shown in FIG. 8, and the IX-IX sectional view of FIG. Shown in In FIG. 8, the second slit 24 is indicated by a broken line for explanation.

  The first slit 22 and the second slit 24 are formed by laminating the first electromagnetic steel plate 20 and the second electromagnetic steel plate 21 and when the stator core 9 is viewed from the stacking direction, the first slit 22 and the second slit 24 It is provided so that the position and shape are different.

  In the present embodiment, the first slit 22 and the second slit 24 are provided so as not to overlap each other. That is, when the laminated first electromagnetic steel plate 20 and second electromagnetic steel plate 21 are viewed from the lamination direction, the first slit 22 and the second slit 24 overlap the first slit 22 and the second bridge portion 25. The first bridge portion 23 and the second slit 24 are provided so as to overlap each other. Thus, in the stacking direction of the first electromagnetic steel plate 20 and the second electromagnetic steel plate 21, the first slit 22 is sandwiched by the second bridge portion 25 to form the first chamber 26, and the second slit 24 is the first bridge. A second chamber 27 is formed by being sandwiched by the portions 23.

  The effect of 2nd Embodiment of this invention is demonstrated.

  If the position and shape of the slit are made equal in all the electromagnetic steel plates, the rigidity is reduced at the location where the slit is provided, and stress concentrates on the bridge portion. Therefore, there is a possibility that the electromagnetic steel sheet is deformed when the stator core is inserted into the case with an interference fit or when the electric wire is wound.

  In the present embodiment, the first electromagnetic steel plate 20 and the second electromagnetic steel plate 21 having different positions and shapes of the first slit 22 and the second slit 24 are alternately laminated, whereby the rigidity is made uniform and due to stress concentration. The deformation of the stator core 9 can be suppressed.

  In addition, since the first chamber 26 is formed by the adjacent first slit 22 and the second bridge portion 25 and the second chamber 27 is formed by the adjacent second slit 24 and the first bridge portion, Infiltration can be prevented by the first chamber 26 and the second chamber 27.

  Next, a third embodiment of the present invention will be described with reference to FIGS. FIG. 10 is a plan view showing a part of the stator core of the present embodiment. FIG. 11 is a schematic cross-sectional view taken along the line XI-XI in FIG.

  The present embodiment is different from the second embodiment in the electromagnetic steel sheet. In the following, a different part from 2nd Embodiment is demonstrated.

  When the stator core 30 is viewed from the stacking direction, the first slit 32 of the first electromagnetic steel plate 31 and the second slit 34 of the second electromagnetic steel plate 33 are a part of the first slit 32 and a part of the second slit 34. And are formed to overlap. That is, the first slit 32 and the second slit 34 are formed so that the first chamber 35 of the first electromagnetic steel plate 31 and the second chamber 36 of the second electromagnetic steel plate 33 communicate with each other.

  The effect of the third embodiment of the present invention will be described.

  When the stator core 30 is viewed from the stacking direction, the first slit 32 and the second slit 34 are formed so that a part of the first slit 32 and a part of the second slit 34 are overlapped. It is possible to further prevent penetration into the inside of the first chamber 35 and the second chamber 36.

  Next, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 12 is a plan view showing a part of the first electromagnetic steel plate of the present embodiment.

  In the present embodiment, the electromagnetic steel sheet is different from that in the second embodiment. In the following, a different part from 2nd Embodiment is demonstrated.

  In the first electromagnetic steel plate 40, the length L1 of the first slit 41 and the length L2 of the first bridge portion 42 are substantially equal. The same applies to the second electromagnetic steel sheet. Furthermore, in the 1st electromagnetic steel plate 40 and the 2nd electromagnetic steel plate, you may make the length of the 1st slit 41, the 1st bridge part 42, the 2nd slit, and the 2nd bridge part substantially equal.

  The effect of 4th Embodiment of this invention is demonstrated.

  For example, in the first electromagnetic steel sheet, when the length of the first slit is increased, the rigidity of the first electromagnetic steel sheet is decreased as compared with other portions, the stator core is deformed, and the iron loss may be deteriorated due to an increase in stress. .

  In the present embodiment, in the first electromagnetic steel plate 40, the length L1 of the first slit 41 and the length L2 of the first bridge portion 42 are substantially equal, and in the second electromagnetic steel plate, the length of the second slit is The length of the second bridge portion is made substantially equal. Thereby, the intensity | strength of the 1st electromagnetic steel plate 40 and the 2nd electromagnetic steel plate can be equalize | homogenized, magnetic flux distribution can be equalized, and the deformation | transformation of the stator core at the time of case insertion and the deterioration of an iron loss can be suppressed.

  Next, a fifth embodiment of the present invention will be described with reference to FIG. FIG. 13 is a plan view showing a part of the first electromagnetic steel plate of the present embodiment.

  In the present embodiment, the electromagnetic steel sheet is different from that in the second embodiment. In the following, a different part from 2nd Embodiment is demonstrated.

  The first electromagnetic steel sheet 50 has a radial width X of the first slit 51 on the distal end portion 12a side of the tooth portion 12 and an air gap X1 that is a distance between the outer peripheral wall 3a of the rotor 3 and the distal end portion 12a of the tooth portion 12. It is as follows. The same applies to the second electromagnetic steel sheet.

  The effect of 5th Embodiment of this invention is demonstrated.

  When the electric motor is operated, a magnetic flux is generated in the radial direction at the teeth portion, and a slit that cuts the magnetic flux may reduce the performance of the electric motor.

  In the present embodiment, by setting the width X of the first slit 51 on the distal end portion 12a side of the tooth portion 12 to be equal to or less than the air gap X1, it is possible to suppress the performance degradation of the electric motor.

  Next, a sixth embodiment of the present invention will be described with reference to FIG. FIG. 14 is a plan view showing a part of the first electromagnetic steel plate of the present embodiment.

  In the present embodiment, the electromagnetic steel sheet is different from that in the second embodiment. In the following, a different part from 2nd Embodiment is demonstrated.

  In the first electromagnetic steel sheet 60, a first region 61 where no slit is formed is formed at a position where the tip 12a side of the tooth portion 12 is formed. The same applies to the second electromagnetic steel sheet.

  The varnish is applied mainly for the purpose of fixing the coil. The method of applying the varnish is to support the inner diameter of the stator core, tilt the stator core obliquely and rotate slowly, and apply the varnish to the coil protruding in the stacking direction in which the first electromagnetic steel plate and the second electromagnetic steel plate are laminated. It is performed by dripping gradually. As a result, the varnish is transmitted through the coil electric wire and penetrates the entire coil, and the coil is fixed.

  Therefore, the varnish penetrates between the laminated first electromagnetic steel plate and the second electromagnetic steel plate mainly from the slot portion formed between the yoke portion and the tooth portion. That is, the varnish does not penetrate so much from the tip side of the teeth portion. Therefore, in the present embodiment, the first electromagnetic steel plate 60 and the second electromagnetic steel plate are formed with a first region 61 having no slit at a location on the tip portion 12a side of the tooth portion 12.

  In addition, when a slight amount of varnish permeates from the portion on the tip portion 12a side of the teeth portion 12, the tip portion 12a side of the teeth portion 12 may be protected with a masking tape or the like.

  The effect of the sixth embodiment of the present invention will be described.

  By providing the first region 61 in which no slit is formed on the distal end portion 12a side of the tooth portion 12 of the first electromagnetic steel sheet 60, the magnetic flux is not hindered by the teeth portion 12, and the performance degradation of the electric motor can be suppressed. it can.

  Next, a seventh embodiment of the present invention will be described.

  In the present embodiment, the stator core is different from that in the sixth embodiment. In the following, different points from the sixth embodiment will be described.

  As shown in FIG. 15, the stator core 70 is formed by arranging the split cores 71 in a circle in the circumferential direction. FIG. 15 is a plan view of the starter core of this embodiment as viewed from the stacking direction. In the present embodiment, the coil is a concentrated winding in which an electric wire such as a copper wire is wound around one split core 71.

  The split core 71 is formed by alternately laminating a first electromagnetic steel plate having a first slit and a first bridge portion and a second electromagnetic steel plate having a second slit and a second bridge portion.

  Here, the first electromagnetic steel sheet will be described with reference to FIG. FIG. 16 is a plan view of the first electromagnetic steel sheet.

  In the first electromagnetic steel plate 72, a second region 74 is formed along the contact portion 73 that contacts the first electromagnetic steel plate adjacent in the circumferential direction. In the second region 74, the first slit 75 is not formed. The same applies to the second electromagnetic steel sheet.

  The effect of 7th Embodiment of this invention is demonstrated.

  When the electric motor is operated, a magnetic flux is generated in the circumferential direction at the yoke portion of the stator core.

  In the present embodiment, for example, in the first electromagnetic steel plate 72 that forms the split core 71, the second region 74 in which the first slit 75 is not formed along the contact portion 73 that contacts the first electromagnetic steel plate adjacent in the circumferential direction. By providing this, it is possible to suppress the magnetic flux from being obstructed in the circumferential direction of the stator core 70, and to suppress the performance degradation of the electric motor.

  Next, an eighth embodiment of the present invention will be described with reference to FIG. FIG. 17 is a plan view of the first electromagnetic steel plate of the present embodiment.

  In the present embodiment, the electromagnetic steel sheet is different from that in the seventh embodiment. In the following, a different part from 7th Embodiment is demonstrated.

  In the first slit 82 adjacent to the contact portion 81, the first electromagnetic steel plate 80 is adjacent to the first opening 83 opening toward the adjacent first electromagnetic steel plate 80 and the tip portion 12 a of the teeth portion 12. The first slit 84 includes a second opening 85 that opens toward the rotor. That is, the 1st slit located in the edge part of the 1st electromagnetic steel plate 80 is provided with the 1st opening part 83 and the 2nd opening part 85 which open in an in-plane direction.

  In addition, you may provide so that the 2nd slit of a 2nd electromagnetic steel plate may open similarly.

  The effects of the eighth embodiment of the present invention will be described.

  The 1st slit 82 located in the contact part 81 side of the 1st electromagnetic steel plate 80 is provided with the 1st opening part 83 opened toward the 1st electromagnetic steel plate adjacent, for example, with the 1st electromagnetic steel plate adjacent. It is possible to prevent the varnish from penetrating.

  Next, a ninth embodiment of the present invention will be described with reference to FIGS. FIG. 18 is a plan view of the first electromagnetic steel sheet of the present embodiment, and FIG. 19 is an enlarged view of a part of FIG.

  In the present embodiment, the electromagnetic steel sheet is different from that in the eighth embodiment. In the following, different points from the eighth embodiment will be described.

  The first electromagnetic steel sheet 90 is located on the radial axis side of the first electromagnetic steel sheet 90, and in the first slit 92 having the first opening 91, the first electromagnetic steel sheet 90 is arranged in the radial axis side, that is, in the radial direction where the varnish penetrates. A first cutout portion 93 that opens from the first opening 91 is provided. Further, the first electromagnetic steel sheet 90 is located radially outside the first electromagnetic steel sheet 90, and in the first slit 95 having the first opening 94, the first electromagnetic steel sheet 90 is arranged radially outward, that is, in the radial direction where the varnish penetrates. A second notch 96 that opens from the first opening 94 is provided. The first cutout portion 93 and the second cutout portion 96 include a line 97 obtained by extending the contact portion 81 in the radial direction, a circumferential wall 98 of the first cutout portion 93, and a circumferential wall 99 of the second cutout portion 96. And a gap is formed between them. That is, the 1st notch part 93 and the 2nd notch part 96 are formed so that a clearance gap may arise between adjacent 1st electromagnetic steel plates. The same applies to the second electromagnetic steel sheet.

  The effect of 9th Embodiment of this invention is demonstrated.

  When the split core is inserted into the case, a large load is applied to the contact portion of the split core. At this time, for example, in the abutting portions of the adjacent first electromagnetic steel plates, a portion having a relatively small radial width may be deformed by the pressure during insertion.

  In the present embodiment, by providing the first cutout portion 93 and the second cutout portion 96 at such a location, for example, when the split core is inserted into the case, the first electromagnetic steel plate 90 is prevented from being deformed. Can do.

  Next, a tenth embodiment of the present invention will be described with reference to FIG. FIG. 20 is a plan view showing a part of the electromagnetic steel sheet of the present embodiment.

  In the present embodiment, the electromagnetic steel sheet is different from that in the second embodiment. In the following, a different part from 2nd Embodiment is demonstrated.

  The outer shape of the electromagnetic steel sheet 100 is line-symmetric with respect to an axis 101 extending in the radial direction through the axis of the stator core. However, the slits 102 of the electromagnetic steel sheet 100 are provided so as to be non-axisymmetric with respect to the axis.

  When laminating the electromagnetic steel plates 100, every other electromagnetic steel plate 100 is turned over and laminated. For example, when the surface shown in FIG. 20 is surfaced, the electromagnetic steel plate 100 shown in FIG. 20 and the electromagnetic steel plate 100 turned upside down are alternately laminated. In the present embodiment, the slits 102 are formed so that the slits 102 do not overlap when a certain electromagnetic steel sheet 100 and the inverted electromagnetic steel sheet 100 are stacked and the electromagnetic steel sheet 100 is viewed from the stacking direction.

  The effects of the tenth embodiment of the present invention will be described.

  The outer shape of the electromagnetic steel sheet 100 is line-symmetrical with respect to an axis 101 extending in the radial direction through the axis of the stator core, and the slit 102 of the electromagnetic steel sheet 100 is non-symmetrical with respect to the axis 101. And every other sheet of electromagnetic steel sheet 100 is turned over and laminated, so that one type of electromagnetic steel sheet 100 can form a chamber along the outer shape of electromagnetic steel sheet 100 and suppress the penetration of varnish. Can be further reduced.

  Next, an eleventh embodiment of the present invention will be described with reference to FIG. FIG. 21 is a plan view showing the electrical steel sheet of the present embodiment.

  In the present embodiment, the electromagnetic steel sheet is different from that in the second embodiment. In the following, a different part from 2nd Embodiment is demonstrated.

  The outer shape of the electromagnetic steel plate 110 is symmetric with respect to the shaft 101 extending in the radial direction through the shaft 111 of the stator core. However, when the slit 112 of the electromagnetic steel sheet 110 is rotated by n (n is a natural number) teeth portions 12 around the shaft 111 of the stator core, the slit 112 before rotation and the slit 112 after rotation are rotated. Are provided so that their positions do not coincide with each other. That is, the slit 112 is formed so that the slits 112 of the two electromagnetic steel plates 110 do not overlap when the electromagnetic steel plate 110 before rotation and the electromagnetic steel plate 110 after rotation are stacked and viewed from the stacking direction. The slits 112 are formed, for example, by reversing the pitch of the slits 112 in the teeth portions 12 adjacent in the circumferential direction. In addition, when laminating | stacking the electromagnetic steel plate 110 by setting n to "1," it is desirable to rotate and laminate | stack the electromagnetic steel plate 110 in the same direction. In addition, the length of the slit 112 of FIG. 21 is shown for description, and is not limited to this. Moreover, the slit 112 may be formed so that a part of the slit 112 does not overlap when viewed from the stacking direction.

  The effects of the eleventh embodiment of the present invention will be described.

  For example, when a magnetic steel sheet is punched out by pressing, the thickness may not be constant. In this embodiment, in such a case, the thickness in the laminating direction of the electromagnetic steel sheets 110 can be adjusted by rotating in the circumferential direction, and the thickness of the stator core can be made uniform. Moreover, penetration of varnish can be suppressed with one type of magnetic steel sheet 110 without providing a step of turning over the magnetic steel sheet 110.

  In addition, it is also possible to combine the structure in the said embodiment.

  A plurality of grooves and slits may be provided in the radial direction.

  It goes without saying that the present invention is not limited to the above-described embodiments, and includes various modifications and improvements that can be made within the scope of the technical idea.

DESCRIPTION OF SYMBOLS 1 Electric motor 9, 70 Stator core 13 Magnetic steel plate 14 Groove 15 Chamber 16 Varnish (adhesive member)
18 Adhesion region 20, 31, 40, 50, 60, 72, 80, 90, 100, 110 First electromagnetic steel sheet 21, 33 Second electromagnetic steel sheet 22, 32, 41, 51, 75, 82, 84, 92 First Slit 23, 42 First bridge portion 24, 34 Second slit 25 Second bridge portion 26, 35 First chamber 27, 36 Second chamber 61 First region 71 Divided core 73, 81 Contact portion 74 Second region 83, 91, 94 First opening 85 Second opening 93, 96 First notch 102, 112 Slit

Claims (17)

An electric motor comprising a stator core formed by laminating electromagnetic steel sheets,
Formed between the laminated electromagnetic steel sheets, comprising a chamber formed along the outer shape of the electromagnetic steel sheet,
An electric motor in which an adhesion region for adhering the laminated electromagnetic steel sheets with an adhesive member is formed closer to the outer edge of the electromagnetic steel sheet than the chamber. The electromagnetic steel sheet includes a groove formed along the outer shape of the electromagnetic steel sheet,
The electric motor according to claim 1, wherein the chamber is formed by the groove. The electromagnetic steel sheet comprises a slit formed along the outer shape of the electromagnetic steel sheet and a bridge portion formed between the adjacent slits,
The electric motor according to claim 1, wherein the chamber is formed by the slit.   The electric motor according to claim 3, wherein the slit penetrates the electromagnetic steel sheet. The electromagnetic steel plate has a first electromagnetic steel plate having a first slit formed along the outer shape of the electromagnetic steel plate, and a second electromagnetic steel plate having a second slit formed along the outer shape of the electromagnetic steel plate. Prepared,
The stator core is formed by alternately laminating the first electromagnetic steel plate and the second electromagnetic steel plate,
When the stator core is viewed from the stacking direction of the first electromagnetic steel plate and the second electromagnetic steel plate, the stator core has different positions and shapes of the first slit and the second slit. Item 5. The electric motor according to Item 4. The first electromagnetic steel sheet includes a first bridge portion formed between the adjacent first slits,
The second electromagnetic steel sheet includes a second bridge portion formed between the adjacent second slits,
When the stator core is viewed from the stacking direction of the first electromagnetic steel plate and the second electromagnetic steel plate, the starter core has the first slit and the second bridge portion overlapped, and the second slit and the second The electric motor according to claim 5, wherein one bridge portion overlaps.   The electric motor according to claim 6, wherein when the stator core is viewed from the stacking direction, a part of the first slit and a part of the second slit overlap each other.   The electric motor according to any one of claims 3 to 7, wherein the slit and the bridge portion have substantially the same length.   9. The width in the radial direction of the slit formed along the outer shape on the radial axis side of the teeth portion of the stator core is equal to or less than an air gap. Electric motor.   9. The electric motor according to claim 3, wherein the electromagnetic steel sheet has a first region where the slit is not formed on a radial axis side of a teeth portion of the stator core. The stator core is formed by a plurality of divided cores,
The said electromagnetic steel plate is provided with the contact part which contact | abuts an adjacent electromagnetic steel plate, and has the 2nd area | region where the said slit is not formed along the said contact part, The any one of Claim 3 to 10 characterized by the above-mentioned. The electric motor described in 1. The stator core is formed by a plurality of divided cores,
The electromagnetic steel sheet is in contact with an adjacent electromagnetic steel sheet,
The electric motor according to any one of claims 3 to 9, wherein the slit adjacent to the contact portion includes an opening that opens toward the adjacent electromagnetic steel sheet.   13. The electric motor according to claim 12, wherein the electromagnetic steel sheet includes a notch that opens from the opening toward a radial direction in which the adhesive member permeates, in the slit having the opening. The outer shape of the electromagnetic steel sheet is line symmetric about an axis extending in the radial direction through the axis of the stator core,
The slit is axisymmetric about an axis extending in the radial direction,
11. The electric motor according to claim 3, wherein the stator core is formed by turning over every other electromagnetic steel sheet and stacking the sheets. The outer shape of the electromagnetic steel sheet is line symmetric about an axis extending in the radial direction through the axis of the stator core,
When the electromagnetic steel sheets are rotated around the axis of the stator core and the laminated electromagnetic steel sheets are viewed from the lamination direction of the electromagnetic steel sheets, the n tooth portions (n is a natural number) of the stator core, The slit is formed so that a part of the slit does not overlap,
11. The electric motor according to claim 1, wherein the stator core is formed by rotating and laminating the electromagnetic steel plates by n teeth.   The electric motor according to claim 15, wherein the n is 1. A method of manufacturing an electric motor including a stator core formed by laminating electromagnetic steel sheets,
Between the laminated electrical steel sheets, forming a chamber along the outer shape of the electrical steel sheet,
A method for manufacturing an electric motor, comprising: adhering an adhesive member from the outside of the chamber to bond the laminated electromagnetic steel sheets.

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