JP2018078716A - Stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator capable of suppressing interference received by a stator coil while locking an insulating sheet. SOLUTION: A stator 1 according to an embodiment is arranged side by side with an annular ring portion 11 having a central axis C, projecting from an inner peripheral surface 11a of the annular portion toward a central axis C, and arranging the inner peripheral surface 11a. The stator core 10 including the plurality of teeth 12, the cuffs 22 arranged on one end side in the central axis C direction of each teeth 12, and the insertion portion 31 inserted into the slot 15 between the adjacent teeth 12. A coil including a curved portion 32 bent toward one cuffer 22 and an insulating sheet 40 arranged between the insertion portion 31 and the teeth 12 are provided, and the other cuffer 22 is provided with the other. The cuffer 22 is provided on one direction side, and includes a protrusion 23 whose other end in the central axis C direction is located on one end side of the one end side of the insulating sheet 40. [Selection diagram] Fig. 2

Description

  The present invention relates to a stator, for example, a stator having a stator cuff.

  Patent Document 1 describes a stator having a plurality of teeth protruding from the inner peripheral surface of an annular stator toward the center. In the stator of Patent Document 1, a coil passes through a slot between adjacent teeth and is wound around the tooth. In addition, a stator cuff is disposed on the teeth, and the stator cuff has protrusions that protrude into slots on both sides of the teeth so as to sandwich the teeth. The protruding portion locks the insulating sheet disposed in the slot.

JP 2016-144230 A

  If the protrusion of the stator cuff protrudes into the slots at both ends of the teeth as in the stator of Patent Document 1, the coil may interfere with the protrusion when the coil is inserted into the slot.

  The present invention has been made to solve such a problem, and provides a stator capable of suppressing interference received by a coil.

  A stator according to an aspect of the present invention includes an annular ring portion having a central axis, and projects from the inner peripheral surface of the annular portion toward the central axis, along a circumference centered on the central axis. A stator core including a plurality of teeth arranged side by side on the inner peripheral surface, a cuff disposed on one end side in the central axis direction of each of the teeth, and inserted into a slot between the adjacent teeth. A coil including an insertion portion, and a curved portion bent toward the one of the cuff members among the one and the other cuff members facing each other across the slot portion into which the insertion portion is inserted; and the insertion portion; And an insulating sheet disposed between the teeth, and when the direction from the one cuff to the other cuff is the other direction, and the opposite direction is one direction, the other cuff is Of the other Kafusa An end on the other end side in the central axis direction includes a protrusion located on the one end side relative to the end on the one end side in the insulating sheet, and the other cuff on the other direction side The end portion of the tooth coincides with the position of the end portion on the other direction side in the tooth where the one cuff is disposed, or the end portion on the other direction side of the tooth is in the one direction. The end portion on the one-direction side of the other cuff member is located on the one-direction side with respect to the end portion on the one-direction side of the tooth on which the other cuff member is disposed. With such a configuration, a stator capable of suppressing interference received by a coil while locking an insulating sheet is provided.

  According to the present invention, a stator capable of suppressing interference received by a coil while locking an insulating sheet is provided.

(A) is the perspective view which illustrated some stators which concern on embodiment, (b) is an enlarged view of the area | region A shown to (a). It is sectional drawing which illustrated the stator which concerns on embodiment, and is sectional drawing shown by the BB line of FIG.1 (b). It is sectional drawing which illustrated the stator which concerns on a comparative example.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. However, the present invention is not limited to the following embodiment. In addition, for clarity of explanation, the following description and drawings are simplified as appropriate.

  A stator according to an embodiment will be described. The stator of this embodiment constitutes a rotating electrical machine, for example, in combination with a rotor. The rotating electrical machine has at least one function of a motor and a generator. First, the configuration of the stator according to the embodiment will be described.

  FIG. 1A is a perspective view illustrating a part of the stator according to the embodiment, and FIG. 1B is an enlarged view of a region A shown in FIG. FIG. 2 is a cross-sectional view illustrating the stator according to the embodiment, and is a cross-sectional view taken along line BB in FIG.

  As shown in FIGS. 1A and 1B and FIG. 2, the stator 1 includes a stator core 10, a stator cuff 20, a stator coil 30, and an insulating sheet 40. The shape of the stator 1 is, for example, an annular shape. Therefore, the stator 1 has a central axis C. When the stator 1 is combined with the rotor to form a rotating electrical machine, for example, the center axis C coincides with the rotation axis of the rotor.

  The direction of the central axis C of the annular stator 1 is referred to as the axial direction. One direction of the axial direction is defined as one end side, and the opposite side from the one end side is defined as the other end side. For example, if the upper side is one end side, the lower side is the other end side. The circumferential direction is a direction along the circumference centered on the central axis C. The radial direction is a direction perpendicular to the central axis C and directed from the circumference centered on the central axis C toward the central axis C.

  1 (a) and 1 (b), the circular stator 1 is shown with a part of a circular arc cut away. Further, only the one end portion of the stator core 10 and the stator cuff 20 are shown, and the other end portion is omitted. Furthermore, in FIG. 1 (a) and (b), the stator coil 30 and the insulating sheet 40 are abbreviate | omitted. In FIG. 2, a part of hatching is omitted so as not to be complicated.

  The stator core 10 includes, for example, a plurality of electromagnetic steel plates including a magnetic material. The stator core 10 has a configuration in which a plurality of electromagnetic steel plates are laminated in the axial direction. Note that the stator core 10 is not limited to a laminate of electromagnetic steel plates, and may be one obtained by pressure-forming magnetic powder with a resin binder. The stator core 10 includes, for example, an annular portion 11 and a plurality of teeth 12.

  The annular portion 11 is an annular member and has a central axis C. A plurality of teeth 12 protrude from the inner peripheral surface 11 a of the annular portion 11 toward the central axis C. The plurality of teeth 12 are arranged radially on the inner peripheral surface 11a along the circumference around the central axis C. For example, the plurality of teeth 12 are arranged at equal intervals along the circumference.

  The teeth 12 have a trapezoidal shape with the central axis C side as an upper side and the annular portion 11 side as a lower side when viewed from one end side in the axial direction. The teeth 12 have a quadrangular prism shape with the trapezoidal shape as the bottom surface and the height in the axial direction. The surface on which the teeth 12 adjacent in the circumferential direction face each other is referred to as a side surface 12a. The side surface 12a has a rectangular shape having a side along the radial direction toward the central axis C and a side along the axial direction.

  The width in the circumferential direction of the teeth 12, that is, the width between the side surfaces 12 a of the teeth 12 is smaller as it is closer to the central axis C. The width of the tooth 12 on the annular portion 11 side is larger than the width of the tooth 12 on the central axis C side.

  A slot 15 is formed between adjacent teeth 12. That is, one of the teeth 12 adjacent to each other with the slot 15 interposed therebetween faces the other tooth 12 with the slot 15 interposed therebetween. The slot 15 is surrounded by the side surface 12a of the tooth 12 in the circumferential direction, and the annular portion 11 side is surrounded by the inner peripheral surface 11a. The opening of the slot 15 as viewed from one end side in the axial direction is a rectangle, for example, a rectangle, opened on the central axis C side.

  As shown in FIG. 1B, the slot 15 may be divided into a plurality of portions in the radial direction. For example, when the slot 15 is viewed from one end side in the axial direction, the slot 15 is divided into portions 15a to 15h in order from the central axis C side of the slot 15 along the radial direction.

  As shown in FIGS. 1A and 1B and FIG. 2, the stator cuff 20 includes, for example, an insulating material. Stator cuff 20 includes, for example, an annular portion 21 and a plurality of cuffs 22. The annular portion 21 is an annular member and has a central axis C. The annular portion 21 is disposed on one end side of the annular portion 11 of the stator core 10. Each cuff member 22 is disposed on one end side in the axial direction of each tooth 12.

  The plurality of cuffs 22 protrude from the inner peripheral surface 21 a of the annular portion 21 toward the central axis C. Accordingly, the plurality of cuffs 22 are arranged radially on the inner peripheral surface 21a along the circumference centered on the central axis C. For example, the plurality of cuffs 22 are arranged at equal intervals along the circumference.

  Of the one and other cuffs 22 facing each other across the slot 15, one of the cuffs 22 includes a protrusion 23. Of the one and the other cuffs 22 facing each other across the slot 15, the direction from one cuff 22 to the other cuff 22 is the other direction, and the opposite direction is the one direction. In the predetermined portion 15 c of the slot 15, the protruding portion 23 is provided on one side of the other cuff member 22, for example. When the slot 15 is divided into the portions 15a to 15h in order from the central axis C side along the radial direction, the protrusion 23 is formed on the other cuff in the portions 15a, 15c, 15e, and 15g. 22 is provided on one direction side, and the portion 15b, the portion 15d, the portion 15f, and the portion 15h are provided on the other direction side of the one cuff member 22.

  The stator coil 30 is a linear member and includes a conductive member as a material. The stator coil 30 includes an insertion portion 31 inserted into the slot 15. The stator coil 30 includes a curved portion 32 connected to the insertion portion 31 and bent toward the cuff 22. The curved portion 32 is, for example, a portion bent toward one of the cuffs 22 among the one and the other of the cuffs 22 facing each other across the portion of the slot 15 in which the insertion unit 31 is inserted. The curved portion 32 of the stator coil 30 is wound around the cuff 22 and the teeth 12.

  A stator coil 30 having an insertion portion 31 inserted into a predetermined portion of the slot 15, for example, the predetermined portion 15 c, is integrated into one and the other cuffs 22 facing each other with the predetermined portion 15 c interposed therebetween. For example, it is bent toward one of the cuffs 22 side. Accordingly, the stator coil 30 inserted into the predetermined portion 15c does not have the curved portion 32 bent toward the other cuff member 22 side. In the predetermined portion 15c, the bending portion 32 is provided only on one cuff member 22 side.

  When the side on which the bending portion 32 is bent is the other cuff member 22 side, the one cuff member 22 includes a protrusion 23 provided on the other direction side. Thus, the protrusion 23 is provided only on the side opposite to the bent direction of the bending portion 32 of the stator coil 30. Therefore, since the protrusion 23 is not provided in the direction in which the stator coil 30 is bent, the stator coil 30 can be bent while avoiding the protrusion 23 when the stator coil 30 is bent. Thereby, the interference of the stator coil 30 can be avoided.

  In a portion 15d adjacent to the predetermined portion 15c in the radial direction, the curved portion 32 is bent in the direction opposite to the curved portion 32 in the portion 15c. That is, in the portion 15d, the curved portion 32 is provided on the other cuff member 22 side. In this case, the protrusion 23 is provided on the other direction side of the one cuff member 22.

  Thus, the direction in which the bending portion 32 is bent and the cuffer 22 provided with the projection 23 are alternately reversed in the portions 15a to 15h along the radial direction from the central axis C side of the slot 15. Good. That is, in the portion 15 a, the portion 15 c, the portion 15 e, and the portion 15 g, the curved portion 32 is bent toward the one cuff member 22, and the protruding portion 23 is provided on one direction side of the other cuff member 22. In the portion 15b, the portion 15d, the portion 15f, and the portion 15h, the curved portion 32 is bent toward the other cuffer 22 side, and the protruding portion 23 is provided on the other direction side of the one cuffer 22.

  The stator coil 30 having the insertion portion 31 and the bending portion 32 constitutes, for example, a U-phase coil, a V-phase coil, and a W-phase coil.

  The insulating sheet 40 is disposed inside the slot 15. The insulating sheet 40 is, for example, insulating paper having insulating properties. The insulating sheet 40 is not limited to insulating paper, and may be an insulating resin film, resin sheet, or the like. The insulating sheet 40 covers the side surface 12 a of the tooth 12 and is disposed between the insertion portion 31 of the stator coil 30 and the tooth 12. The insulating sheet 40 sandwiches the insertion portion 31 of the coil 30 from one side and the other side in the slot 15. The insulating sheet 40 ensures insulation between the state core 10 and the stator coil 30 in the stator 1.

  An end portion 40 c on one end side in the axial direction of the insulating sheet 40 is located in the vicinity of the end portion 12 c on one end side of the tooth 12. The end 23c on the other end side in the axial direction of the protrusion 23 is located on one end side with respect to the end 40c on the one end side in the axial direction of the insulating sheet 40. Thereby, the projection part 23 can latch the insulating sheet 40.

  When the side where the curved portion 32 is bent is the one cuffer 22 side, the end 22b on the other direction side of the one cuffer 22 is the end on the other direction side of the tooth 12 where the one cuffer 22 is disposed. It is in agreement with the position of 12b, or it is located in one direction side rather than the edge part 12b of the other direction side in the teeth 12. FIG. Thereby, since the projection part 23 is not provided in one cuff member 22, interference with the stator coil 30 and the stator cuff member 20 can be suppressed.

  In the other cuff member 22, the end portion 22 b on one side of the portion excluding the protruding portion 23 coincides with the position of the end portion 12 b on one side in the tooth 12 where the other cuff member 22 is disposed, or The tooth 12 is located on the other direction side than the end portion 12b on the one direction side. However, the other cuff member 22 includes a protrusion 23 on one side. Therefore, the end portion 23b on the one-direction side of the other cuff member 22 is positioned on the one-direction side with respect to the end portion 12b on the one-direction side of the tooth 12 on which the other cuff member 22 is disposed. Thereby, the projection part 23 can latch the insulating sheet 40.

  When the positional relationship between the end portions 22b and 23b of the cuff member 22 is viewed from one end side in the axial direction, the following is obtained. That is, in one and the other cuffs 22 facing each other across the slot 15, the end 22 b on the other side of the one cuff 22 is within the surface of one end of the tooth 12 where the one cuff 22 is disposed. positioned. In the other cuff 22, an end 22 b on one side of the portion excluding the protruding portion 23 is located in a surface on one end of the tooth 12 on which the other cuff 22 is disposed. However, the other cuff member 22 includes a protrusion 23 on one side. Therefore, the end portion 23 b on one side of the other cuff member 22 is located in the opening of the slot 15 on the one direction side of the other cuff member 22.

  Next, operation | movement of the stator 1 of this embodiment is demonstrated. For example, the case where the stator 1 is used as the stator 1 of a motor will be described. When used in a generator, instead of rotating the rotor with electric energy, the rotor is rotated to generate electric energy.

  The insulating sheet 40 is disposed in the slot 15 between the adjacent teeth 12. Then, the insertion portion 31 of the stator coil 30 is inserted into the slot 15 in which the insulating sheet 40 is disposed. Further, the stator coil 30 is bent toward the cuff member 22 where the projections 23 are not provided to form the curved portion 32. Then, the U-phase coil, the V-phase coil, and the W-phase coil of the stator coil 30 are connected to each other.

  A rotor provided with a permanent magnet is arranged in the interior surrounded by the annular stator 1 so as to coincide with the central axis C. The phase is shifted to the U-phase coil, V-phase coil, and W-phase coil of the stator coil 30 of the stator 1, for example, a sine wave current is passed. As a result, a magnetic field equivalent to an annular magnet is generated in the stator core 10. The stator core 10 generates a rotating magnetic field by continuing to pass a sine wave current. Therefore, the rotor rotates with repulsive force and attractive force received from the rotating magnetic field of the stator 1. At this time, the insulating sheet 40 insulates between the teeth 12 and the stator coil 30. The protrusion 23 provided on the cuff member 22 locks the insulating sheet 40. In this way, the stator 1 can be used as the stator 1 of the motor.

The effect of the stator 1 of this embodiment is demonstrated.
In the stator 1 of the present embodiment, for example, the stator coil 30 is bent on one cuffer 22 side of the one and other cuffers 22 facing each other across the slot 15, and the protrusion 23 is formed on the other cuffer 22 side. Is provided. Therefore, the end portion 23b on the one-direction side of the other cuff member 22 is positioned on the one-direction side with respect to the end portion 12b on the one-direction side of the tooth 12 on which the other cuff member 22 is disposed. Thereby, the projection part 23 can latch the insulating sheet 40 and can suppress the position shift of the insulating sheet 40.

  For example, the protrusion 23 prevents the insulating sheet 40 from being pulled into the slot 15 when the stator coil 30 is inserted into the slot 15. Further, the protrusion 23 suppresses the insulating sheet 40 disposed inside the slot 15 from falling out of the slot 15.

  On the other hand, for example, Japanese Patent Application Laid-Open No. 2008-283801 describes that irregularities are formed on the side surfaces of the teeth, that is, the inner peripheral surface of the slot, and irregularities are also formed on the surface of the insulating paper. . In addition, it is described that the unevenness of the surface of the insulating paper is engaged with the unevenness of the inner peripheral surface of the slot to prevent the displacement of the insulating paper.

  However, in this method, a process for forming irregularities on the surface of a straight roll-shaped insulating paper must be added, which increases the number of manufacturing processes. In addition, since the structure for engaging the teeth and the unevenness of the insulating paper is complicated, molding is difficult.

  JP 2013-162562 A discloses that insulating paper is formed in a cylindrical shape, one cross-sectional width is made larger than the slot width, and the other width is made smaller than the slot width. It is described that no cuffs are provided.

  However, this method requires a complicated structure for preventing the insulating paper from coming out of the slot, which increases the number of manufacturing steps. In addition, since stress is applied to the insulating paper in the slot, the insulating paper may be torn, which may cause insulation failure. Thus, in the prior art, since the shape of the insulating paper is complicated, it is difficult to form and the manufacturing process increases.

  In the present embodiment, the projection 23 is formed on the cuff member 22. Therefore, since the structure for preventing the insulation sheet 40 from falling off can be simplified, the cost of the manufacturing process can be reduced.

  The protrusion 23 is provided on the cuff 22 opposite to the curved portion 32 where the stator coil 30 is bent, out of the cuffs 22 facing each other across the slot 15. And it is not provided in the cuff member 22 on the curved portion 32 side. Therefore, interference with the curved portion 32 of the stator coil 30 can be suppressed. Therefore, the stator coil 30 can be sufficiently bent toward the cuff member 22 side.

  FIG. 3 is a cross-sectional view illustrating a stator according to a comparative example. In the stator 101 shown in FIG. 3, the protrusions 23 are provided on both of the cuffs 22 facing each other with the slot 15 interposed therebetween. As in the comparative example shown in FIG. 3, when the projections 23 are provided on both of the cuffs 22 that are opposed to each other across the slot 15, the projections 23 of the cuffer 22 on the side where the stator coil 30 is bent become the stator coil 30. Would cause excessive bending stress in the stator coil 30.

  On the other hand, in this embodiment, the projection 23 is provided only on the cuff 22 on the side opposite to the curved portion 32 where the stator coil 30 is bent, and is not provided on the cuff 22 on the curved portion 32 side. As a result, when the stator coil 30 is inserted into the slot 15, the stator coil 30 can be bent while avoiding the protrusion 23. Therefore, even when the protrusion 23 for locking the insulating sheet 40 is provided, Interference can be suppressed.

  The embodiment according to the present invention has been described above. However, the present invention is not limited to the above-described configuration, and modifications can be made without departing from the technical idea of the present invention.

DESCRIPTION OF SYMBOLS 1,101 Stator 10 Stator core 11 Ring part 11a Inner peripheral surface 12 Teeth 12a Side surface 12b End part 12c End part 15 Slots 15a, 15b, 15c, 15d, 15e, 15f, 15g, 15h Part 20 Stator cuff 21 In the annular part 21a Peripheral surface 22 Cuffs 22b End 23 Projection 23b End 23c End 30 Stator coil 31 Insertion part 32 Bending part 40 Insulating sheet 40c End part C Center axis

Claims (1)

An annular ring portion having a central axis, and projecting from the inner peripheral surface of the annular portion toward the central axis, are arranged along the inner peripheral surface along a circumference centered on the central axis. A stator core including a plurality of teeth;
Cuffs disposed on one end side in the central axis direction of each of the teeth;
The insertion part inserted into the slot between the adjacent teeth, and the one and the other cuffs facing each other across the slot part where the insertion part is inserted were bent toward the one cuff. A coil including a bending portion;
An insulating sheet disposed between the insertion portion and the teeth;
With
When the direction from the one cuff to the other cuff is the other direction, and the opposite direction is one direction,
The other cuff is provided on one side of the other cuff, and the end on the other end side in the central axis direction is located on the one end side with respect to the end on the one end side in the insulating sheet. Part
The end portion on the other direction side of the one cuff link coincides with the position of the end portion on the other direction side of the tooth where the one cuff member is disposed, or the end portion on the other direction side of the tooth. Located on the one direction side from the end,
The end portion on the one-direction side in the other cuff is positioned on the one-direction side with respect to the end portion on the one-direction side in the teeth where the other cuff is disposed.
Stator.

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