JP4701921B2 - Stator structure of axial gap type rotating electrical machine - Google Patents

Description

  The present invention relates to a stator structure of an axial gap type rotating electrical machine in which a stator and a rotor are arranged to face each other along a rotation axis.

  A rotating electrical machine having a permanent magnet on a rotor is used in many automobiles or industrial machines for reasons such as low loss, high efficiency, and high output. These rotary electric machines are roughly classified into a radial gap type and an axial gap type. In particular, an axial gap type rotary electric machine in which a stator and a disk-shaped rotor are arranged to face each other along a rotary shaft is a rotary electric machine itself. Since it can be made thinner in the axial direction, it is more often used when there are restrictions on the layout, and the stator has the cores arranged in parallel in the circumferential direction, and the outer periphery is covered with a case. It is integrally formed by a resin mold that fills resin between the core without any gap.

  By the way, in such an axial gap type rotating electrical machine, an axial force acts on the core by the magnetic interaction between the stator and the rotor. Therefore, in the prior art, in the axial direction acting on the core, Supporting the force by a resin filled between the case and the core is performed.

  As a specific structure, for example, as shown in FIG. 6, a core 53 wound with a coil 52 via an insulator 51 and provided with flanges at both axial ends is arranged in parallel in the circumferential direction. A case 54 is provided on the outer peripheral side, and circumferential grooves 55 and 56 are provided on the inner peripheral side of the case 54, and a resin is filled between the case 54 and the core 53. In this case, the resin filled between the core 53 and the case 54 supports the axial force F acting on the core 53 mainly by the strength in the bending direction and the shearing direction.

  However, since the resin has a higher strength in the compression direction than in the bending and shearing directions, the rotating electric machine of such a form is not necessarily effective in supporting the axial force acting on the core by the resin. It wasn't.

Further, as described in Patent Document 1 and Patent Document 2, a yoke protruding inward on the inner peripheral surface of the case is provided, and the axial force acting on the core is supported by the yoke. Although it is conceivable, depending on such a method, a jig such as a bolt for fixing the yoke and the yoke to the inner peripheral surface of the case is required as a new part, which increases the size and weight of the rotating electrical machine. There were disadvantages.
JP 2003-88032 A JP 2004-52657 A

  The present invention aims to solve the above-described problems, and the purpose thereof is to more efficiently increase the axial force acting on the core without increasing the size and weight of the rotating electrical machine. It is an object to provide a stator structure of an axial gap type rotating electrical machine that can be supported.

The stator structure of the axial gap rotary electric machine according to claim 1, in parallel a plurality of cores wound coils in the circumferential direction, Utotomoni the plurality of cores and the case covering the outer periphery of the plurality of cores in the case In a stator structure of an axial gap type rotating electrical machine in which a stator and a rotor formed by resin molding are arranged opposite to each other along a rotation axis, at both axial ends of the core, radially outward of the rotating electrical machine Protruding flanges are provided, circumferential grooves recessed outward in the radial direction of the rotating electrical machine are provided at positions adjacent to the inner side in the axial direction of the flanges on the inner peripheral surface of the case, and the flanges and the circumferential grooves Both are provided with insert members in a form of overlapping in the radial direction.
Here, the axial direction refers to the central axis direction of the rotating electrical machine, the radial direction refers to the radial direction of the rotating electrical machine, and the circumferential direction refers to the circumferential direction of the rotating electrical machine.

  According to this, when an axial force is applied to the core, the resin located in the portion overlapping the flange portion of the core and the radial direction of the insert member is compressed, and the circumferential groove of the case and the insert member are compressed. The resin located in the overlapping part in the radial direction of the resin is compressed, so that the axial force acting on the core through the resin through the resin is more effective with high strength in the resin compression direction. Can be supported.

Furthermore, using resin in the compression direction prevents deterioration of the resin and peeling of the resin from the core and case, and generates play as a rotating electrical machine, compared to using the resin in the bending and shearing directions. Can be prevented.
In addition, as compared to providing a yoke for supporting the core on the inner peripheral surface of the case as in the prior art, the yoke and the jig for fixing it to the case are omitted, An increase in size and an increase in weight can be prevented.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic sectional view showing an embodiment of a stator structure of an axial gap type rotating electrical machine according to the present invention. In FIG. 1, C indicates the central axis of the rotating electrical machine.

  In the stator structure of this axial gap type rotating electrical machine, a plurality of cores 3 in which a coil 1 is wound via an insulator 2 are arranged in parallel in the circumferential direction, and the outer peripheral side of the plurality of cores 3 is covered with a case 4 and resin-molded. In the stator structure of an axial gap type rotating electrical machine in which a stator 5 and a rotor (not shown) are arranged to face each other along a rotation axis, flanges 3a and 3b are provided at both axial ends of the core 3, and the case 4 A circumferential groove 6, 7 is provided at a position adjacent to the inner side in the axial direction of the flange portions 3 a, 3 b of the inner peripheral surface of the inner peripheral surface, and both the flange portion 3 a and the circumferential groove 6 are radially overlapped. An insert member 8 is provided, and an insert member 9 having a shape that overlaps both the flange portion 3b and the circumferential groove 7 in the radial direction is provided.

In addition, 10 in FIG. 1 shows resin. Further, the flange portions 3 a and 3 b are formed so as to protrude in both the radial direction and the circumferential direction with respect to the other portions of the core 3.
Further, a predetermined axial clearance is provided between the flange 3a and the left axial end surface of the insulator 2 and between the flange 3b and the right axial end surface of the insulator 2, as shown in FIG. The inner circumferential side of the insert members 8 and 9 is overlapped in the radial direction with respect to the flange portions 3a and 3b by using the direction gap.

  According to this, when the axial force F from the left to the right acts on the core 3, the resin 10 located in the portion A that overlaps the flange 3a of the core 3 and the insert member 8 in the radial direction is compressed. In addition, the resin 10 located in the portion B that overlaps the circumferential groove 6 of the case 4 and the insert member 8 in the radial direction is compressed, whereby the case 3 passes through the resin 10 and the core 3 is compressed. The axial force F acting on the resin 10 can be more effectively supported with high strength in the compression direction of the resin 10.

  FIG. 1 shows a case where an axial force F from left to right is applied, but when an axial force from right to left is applied, the flange 3b of the core 3 and the insert member The resin 10 located in the portion D that overlaps in the radial direction 9 is compressed, and the resin 10 located in the portion E that overlaps the circumferential groove 7 of the case 4 and the insert member 9 in the radial direction is compressed. In this way, the axial force F acting on the core 3 via the resin 10 by the case 3 can be supported more effectively with high strength in the compression direction of the resin 10.

  Further, by using the resin 10 in the compression direction, it is possible to prevent deterioration of the resin 10 and peeling of the resin 10 from the core 3 and the case 4 as compared to using the resin 10 in the bending and shearing directions. It is possible to prevent the play from occurring.

  In addition, as compared to providing a yoke for supporting the core on the inner peripheral surface of the case as in the prior art, the yoke and the jig for fixing it to the case are omitted, An increase in size and an increase in weight can be prevented.

  In the axial gap type rotating electrical machine shown in FIG. 1, when the coil 1 is excited by an inverter (not shown), a rotating magnetic field is formed in the circumferential direction of the stator 5 and a plurality of permanent magnets having different polarities alternately embedded in the circumferential direction. A magnetic rotor (not shown) is attracted and repelled by the rotating magnetic field generated by the stator 5 to generate magnet torque, and the rotor rotates at a synchronous speed with the rotating magnetic field by using it as power.

FIG. 2 is a schematic cross-sectional view showing another embodiment of a stator structure of an axial gap type rotating electrical machine according to the present invention. C in FIG. 2 indicates the central axis of the rotating electrical machine.
In the stator structure shown in FIG. 1, when the insert members 8 and 9 are radially overlapped with the flange portions 3 a and 3 b of the core 3, the flange portions 3 a and 3 b of the core 3 and the axial direction of the insulator 2 are arranged. Although the axial gap provided between the end faces is used, in the stator structure of the form shown in FIG. 2, an axial gap is provided between the flanges 3 a and 3 b of the core 3 and the axial end face of the insulator 2. The circumferential direction grooves 2a and 2b are provided at both axial end portions of the insulator 2 and the insert members 8 and 9 are inserted therein, thereby inserting the insert members 8 and 9 into the flange portion 3a of the core 3. 3b is overlapped in the radial direction.

  This also compresses the resin 10 located at the portion of the core 3 that overlaps the flange 3a of the core 3 in the radial direction when the axial force F from the left to the right acts on the core 3. At the same time, the resin 10 located in a portion overlapping the circumferential groove 6 of the case 4 and the insert member 8 in the radial direction is compressed, whereby the case 3 acts on the core 3 via the resin 10. The axial force F can be more effectively supported with high strength in the compression direction of the resin 10.

  FIG. 2 shows a case where an axial force F from left to right is applied, but when an axial force from right to left is applied, the flange 3b of the core 3 and the insert member 9, the resin 10 located in a portion overlapping in the radial direction of 9 is compressed, and the resin 10 located in the portion overlapping the circumferential groove 7 of the case 4 and the insert member 9 in the radial direction is compressed. As a result, the axial force F acting on the core 3 via the resin 10 by the case 3 can be more effectively supported with high strength in the compression direction of the resin 10.

Here, the insert members 8 and 9 are constituted by, for example, a substantially annular high-strength member, and as the high-strength member, for example, aluminum, SUS, ceramics, or the like can be used.
In particular, when the insert member is made of ceramics, it can maintain the same strength as aluminum or SUS and can suppress the generation of eddy currents. (Equivalent to claim 5)

  In assembling the rotating electrical machine, various forms are conceivable, and the insert member can be incorporated as a snap ring, or the insert member can be incorporated as a type that can be divided in the circumferential direction. Alternatively, an annular insert member can be incorporated as a type in which the case can be divided in the axial direction. Furthermore, a plurality of insert members may be provided intermittently in the circumferential direction.

FIG. 3 is a schematic view showing one embodiment of a stator structure of an axial gap type rotating electrical machine according to the present invention as seen from the outside in the central axis direction.
In FIG. 3, 3 indicates a core, 8 indicates an insert member, and 4 indicates a case.
In addition to the configuration shown in FIG. 1, a convex portion 8 a that protrudes radially outward is provided on the outer peripheral side of the insert member 8, and an additional convex portion 8 b that protrudes radially inward is provided on the inner peripheral side. A concave portion 4a corresponding to the convex portion 8a is provided at the groove bottom of the groove, and the additional convex portion 8b is overlapped with a portion excluding the flange portion 3a of the core 3 in the radial direction. (Equivalent to claim 2)

  Of course, it goes without saying that the additional convex portion 8 b is positioned in the middle of the adjacent core 3. Here, the circumferential position of the additional protrusion 8b and the circumferential position of the protrusion 8a are matched. Furthermore, “corresponding” of the concave portion 4a corresponding to the convex portion 8a means that the concave portion 4a covers the convex portion 8a with a predetermined gap as shown in FIG. An overlapping form shall be shown.

  According to this, as shown in FIG. 3, when a clockwise circumferential force T acts on the core due to the magnetic interaction between the stator and the rotor, Since the resin 10 located in the portion F overlapping in the radial direction of the additional convex portion 8b is compressed, the resin 10 located in the portion G overlapping in the radial direction of the convex portion 8a and the concave portion 4a is compressed. The circumferential force T acting on the core 3 through the resin 10 by the case 3 can be more effectively supported with high strength in the compression direction of the resin 10.

In addition, the use of the resin 10 in the compression direction prevents deterioration of the resin 10 and peeling of the resin 10 from the core 3 and the case 4 as compared with the use in the bending and shearing directions. Can be prevented from occurring.
3 shows only the insert member 8 shown in FIG. 1, the insert member 9 can have the same configuration.

FIG. 4 is a schematic view showing an embodiment of a stator structure of an axial gap type rotating electrical machine according to the present invention as viewed from the outside in the central axis direction.
In FIG. 4, 3 indicates a core, 8 indicates an insert member, and 4 indicates a case.

In addition to the configuration shown in FIG. 1, a convex portion 8 a that protrudes radially outward is provided on the outer peripheral side of the insert member 8, and an additional convex portion 8 b that protrudes radially inward is provided on the inner peripheral side. A concave portion 4a corresponding to the convex portion 8a is provided at the groove bottom of the groove, and the additional convex portion 8b is overlapped with a portion excluding the flange portion 3a of the core 3 in the radial direction. (Equivalent to claim 2)
Furthermore, the circumferential length is increased so that the additional protrusion 8b overlaps the flange 3a of the adjacent core 3 in the circumferential direction. (Equivalent to claim 3)

  According to this, in addition to the function and effect of the configuration corresponding to claim 2 described above, when an axial force is applied to the core 3, the inner peripheral side of the insert member 8 and the flange portion 3 a are over in the radial direction. Since the resin 10 positioned at the wrapping portion is compressed and the resin 10 positioned at the overlapping portion of the flange 3 of the core 3 and the additional convex portion 8b in the circumferential direction is compressed, the core 4 is compressed by the case 4 The resin 10 can be supported more effectively with high strength in the compression direction.

FIG. 5 is a schematic view showing an embodiment of a stator structure of an axial gap type rotating electrical machine according to the present invention.
Here, in addition to the configuration shown in FIG. 1, the insert members 8 and 9 are bus bars for supplying power to the coil 1 of the stator 5. (Equivalent to claim 4)

  According to this, the volume and weight of the electric wire or bus bar that supplies electric power to the coil 1 are omitted by combining with the volume and weight of the insert members 8 and 9, thereby reducing the size and weight of the entire rotating electrical machine. be able to.

  In addition, this invention is not limited only to the said embodiment, Many deformation | transformation or a change is possible.

  The present invention is suitable for use in an axial gap type rotating electrical machine, and in particular, an axial gap type rotation in which a rotor is positioned on both axial sides of a core constituting a stator and both axial end surfaces of the core are gap surfaces. In a stator in which the core cannot be fixed from the back side using a jig such as a back yoke or a bolt of an electric machine, this is effective in increasing the support strength of the core by the case.

1 is a schematic cross-sectional view showing an embodiment of a stator structure of an axial gap type rotating electrical machine according to the present invention. It is a schematic diagram which shows other embodiment of the stator structure of the axial gap type rotary electric machine which concerns on this invention. It is a mimetic diagram showing one embodiment of a stator structure of an axial gap type rotating electrical machine concerning the present invention. It is a mimetic diagram showing one embodiment of a stator structure of an axial gap type rotating electrical machine concerning the present invention. It is a schematic diagram which shows other embodiment of the stator structure of the axial gap type rotary electric machine which concerns on this invention. It is a schematic diagram sectional drawing which shows the stator structure of the conventional axial gap type rotary electric machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Coil 2 Insulator 3 Core 3a collar part 3b collar part 4 case 4a recessed part 5 stator 6 circumferential groove 7 circumferential groove 8 insert member 8a convex part 8b additional convex part 9 insert member 10 resin 51 coil 52 insulator 53 core 54 case 55 Circumferential groove 56 circumferential groove

Claims (7)

In parallel a plurality of cores wound coils in the circumferential direction, the stator and the rotor rotary shaft comprising between the plurality of Utotomoni the plurality covering the outer circumferential side in case of the core core and the case resin molding In the stator structure of an axial gap type rotating electrical machine arranged opposite to each other,
Provided at both axial ends of the core are flanges that protrude radially outward of the rotating electrical machine, and radially outward of the rotating electrical machine at positions adjacent to the axially inner side of the flange of the inner peripheral surface of the case. A stator structure for an axial gap type rotating electrical machine, wherein a recessed circumferential groove is provided, and an insert member is provided in such a manner as to radially overlap both the flange and the circumferential groove. An insulator is interposed between the coil and the core, an axial gap is provided between the axial end surface of the insulator and the flange, and the insert member is provided in the axial gap. The stator structure of an axial gap type rotating electrical machine according to claim 1, wherein the stator structure is an axial gap type rotating electrical machine. An insulator is interposed between the coil and the core, a circumferential groove is provided at each axial end of the insulator, and the insert member is provided in the circumferential groove. The stator structure of the axial gap type rotating electrical machine according to claim 1. A convex portion protruding radially outward is provided on the outer peripheral side of the insert member, an additional convex portion protruding radially inward is provided on the inner peripheral side, and a concave portion corresponding to the convex portion is provided at the groove bottom of the circumferential groove. The stator structure of an axial gap type rotating electrical machine according to any one of claims 1 to 3 , wherein the additional convex portion is overlapped in a radial direction with a portion excluding the flange portion of the core. The stator structure of an axial gap type rotating electrical machine according to claim 4 , wherein the additional convex portion is overlapped with the flange portion of the adjacent core in the circumferential direction. The stator structure of an axial gap type rotating electrical machine according to any one of claims 1 to 5 , wherein the insert member is a bus bar that supplies electric power to a coil of the stator. The stator structure of the axial gap rotary electric machine according to claim 1-6, characterized by forming the insert member of a ceramic.

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