JP2018078691A - Stator of rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator core of a rotary electric machine in which adhesion between core plates can be more reliably performed.SOLUTION: Each of core plates 30 layered in an X direction in a stator core 10 has: an inner circumferential side edge having a burr protruding toward one side in the X direction; an outer circumferential side edge having a burr protruding toward the other side in the X direction; inner circumferential side vents 80 having on the opening edges thereof burrs protruding to the other side in the X direction and each being located at a position on one side, in the θ direction, of a tooth 12 with respect to a center α of the tooth 12 and on the inner circumferential side of the tooth 12; outer circumferential side vents 81 having on the opening edges thereof burrs protruding to the one side in the X direction and each being located at a position on a side opposite to the one side, in the θ direction, of the tooth 12 with respect to the center α and on the outer circumferential side than the inner circumferential side vents 80. The core plate 30 in a first condition where the inner circumferential side vents 80 are located on one side in the circumferential direction of the tooth 12 and the core plate 30 in a second state which is the reverse of the first state are alternately arranged in the X direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a stator for a rotating electrical machine.

  Conventionally, as a stator of a rotating electrical machine, there is one described in Patent Document 1. The stator core of this stator includes a plurality of core plates stacked in the thickness direction, and the core plate is formed by punching a magnetic steel sheet. The rotor receiving holes and slots of the core plate are punched from one side in the thickness direction on the inner circumferential side with respect to the die support position of the electromagnetic steel plate, with the outer side of the magnetic steel plate and the other side in the thickness direction supported by the die. It is formed by punching. In that case, the burr | flash which protrudes in the thickness direction other side is produced | generated in the inner peripheral side edge part of an electromagnetic steel plate. Further, the outer peripheral surface of the core plate is punched from one side in the thickness direction on the inner peripheral side with respect to the die support position of the electromagnetic steel plate while the other side in the thickness direction is supported by the die. At that time, a burr protruding on one side in the thickness direction is generated at the outer peripheral side edge of the electromagnetic steel sheet.

  As shown in FIG. 11, that is, a partial cross-sectional view in the axial direction (thickness direction) of the stator core 110 of the conventional example, the stator of this rotating electrical machine has an inner circumferential burr 171 arranged on one axial side (one in the X direction). The core plate 130 in a state of projecting to the side) and the core plate 130 in the state of projecting the burr 171 on the inner peripheral side to the other side in the axial direction are alternately arranged in the axial direction. As a result, the plurality of core plates 130 are laminated so that the inner peripheral burr 171 faces in the axial direction and the outer peripheral burr 173 also faces in the axial direction.

  As shown in FIG. 11, the burr 173 on the outer peripheral side of the two core plates 130 facing the inner peripheral burr 171 is on the side different in the axial direction so as not to block the axial gap between the two core plates 130. Protruding. An outer peripheral side opening 186 that is not blocked by the burr 173 is provided on the outer peripheral side of the axial gap between the two core plates 130 facing the inner peripheral burr 171. Further, the burrs 171 on the inner peripheral side of the two core plates 130 facing the outer side burrs 173 also protrude on different sides in the axial direction so as not to block the axial gap between the two core plates 130. An inner peripheral side opening 185 that is not blocked by the burr 171 is provided on the inner peripheral side of the axial gap between the two core plates 130 facing the outer peripheral burr 173.

  In the stator core 110 of the conventional example, the core plate 130 in a state in which the inner peripheral side burr 171 protrudes on one axial side (X direction one side) and the inner peripheral burr 171 protrudes on the other axial side. By alternately arranging the core plates 130 in the axial direction, the inner and outer openings 185 and 186 are formed. Then, the adhesive material 177 such as varnish can easily enter the gap in the axial direction of the core plate 130 through the inner and outer openings 185 and 186 so that the adjacent core plates 130 can be easily bonded together. I have to.

JP, 2006-032331, A

  In the above-described conventional stator, the outer circumferential burr 173 facing the radial outer circumferential side in the axial gap provided with the inner circumferential opening 185 is closed. Conversely, the inner circumferential side burr 171 is closed by two radially inner circumferential sides facing each other in the axial gap where the outer circumferential side opening 186 is provided. Therefore, when the adhesive material 177 enters from the inner and outer openings 185 and 186 in the directions of the arrows P and Q, the air flowing to the outer and inner circumferences is opposed to the two outer and inner burrs 171 and 173 facing each other. Therefore, it is difficult to escape to the outside, and air reservoirs 174 and 175 are easily formed at the corners on the outer and inner peripheral sides, and the adhesive material 177 may not easily reach the corners.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a stator core for a rotating electrical machine in which an adhesive material can easily spread between adjacent core plates in the axial direction and can more reliably execute bonding between core plates.

  A stator of a rotating electrical machine according to the present invention includes an annular yoke and a stator core having a plurality of teeth projecting radially inward from the yoke in a circumferentially spaced state, and the stator core has a thickness A plurality of core plates stacked in a direction, the core plate having an inner peripheral side edge portion having a burr protruding on one side in the thickness direction and a burr protruding on the other side in the thickness direction. An outer peripheral side edge and a burr projecting to the other side in the thickness direction are provided on the opening edge, and located on one side of the tooth with respect to the center of the tooth in the circumferential direction, and in the radial direction, An inner peripheral air hole located on the inner peripheral side of the teeth and a burr protruding on one side in the thickness direction are provided at the opening edge, and the teeth are formed with respect to the center of the teeth in the peripheral direction. And an outer peripheral air hole positioned on the outer peripheral side of the inner peripheral air hole in the radial direction, the inner peripheral air hole being the teeth. The core plate in the first state located on one side in the circumferential direction and the state in which the first state is turned over, the inner circumferential air hole being on the other side in the circumferential direction in the teeth The positioned core plates in the second state are alternately arranged in the thickness direction.

  According to the stator core of the rotating electrical machine according to the present invention, the core plate has the inner peripheral side air holes on the inner peripheral side of the teeth, and the outer peripheral side air holes on the outer peripheral side. Therefore, when the adhesive material enters from the outer periphery and the inner peripheral side opening, the air that flows to the inner periphery and the outer peripheral side easily flows out to the outside through the inner peripheral and outer peripheral side air holes, and the air enters when the adhesive material enters. It becomes difficult to collect in the corner of the axial clearance. Therefore, it becomes easy for the adhesive material to spread between the core plates adjacent in the axial direction, and the core plates can be more reliably bonded to each other.

  Further, in the core plate, the inner peripheral air hole and the outer peripheral air hole are provided in regions opposite to each other with respect to the center in the circumferential direction of the teeth, and the inner peripheral air hole is on one side in the circumferential direction of the teeth. The core plate in the first state located at the position 1 and the core plate in the second state in which the inner peripheral side air holes are located on the other circumferential side of the teeth are alternately arranged in the thickness direction. Therefore, in a state where a plurality of core plates are stacked, the inner peripheral air holes do not overlap in the thickness direction, and the outer peripheral air holes also do not overlap in the thickness direction. Therefore, in the two core plates adjacent to each other in the thickness direction, burrs formed at the opening edge of the inner circumferential air hole face the thickness direction and do not block the air flow path. The burr formed at the opening edge does not face the flow path of air by facing the thickness direction. As a result, air can easily flow out to the outside through the inner and outer peripheral air holes, and from this point, the adhesive material can easily reach the corners between the core plates adjacent in the thickness direction.

It is a top view when the stator which concerns on one Embodiment of this invention is seen from the X direction one side. It is a top view when a core plate is seen from the X direction one side. It is a top view which shows a part of (theta) direction in a stator core. It is the sectional view on the AA line of FIG. (A) is a partial cross-sectional view in the axial direction in the middle of forming an inner peripheral edge and an outer peripheral air hole in a magnetic steel sheet, and includes a rotor accommodation hole, a slot, and an outer peripheral air hole. It is a partial sectional view of the axial direction in the middle of forming. (B) is a partial sectional view in the axial direction passing through the central axis of the outer peripheral side air hole in the inner peripheral side edge and the outer peripheral side air hole in the magnetic steel sheet after forming the outer peripheral side air hole. It is a schematic diagram explaining the direction of a press at the time of outer peripheral side air hole formation, and the formation direction of a burr | flash. (A) is a partial cross section of the axial direction in the middle of forming the outer peripheral side edge and the inner peripheral side air hole in the magnetic steel sheet. (B) is a partial sectional view in the axial direction passing through the central axis of the inner peripheral side air hole in the magnetic steel sheet after forming the outer peripheral side edge part and the inner peripheral side air hole. It is an axial sectional view during adhesion material impregnation in a portion where four core plates are laminated in a stator core. FIG. 6 is an axial cross-sectional view during impregnation of an adhesive material in another portion where four core plates are stacked in a stator core. It is a top view of the conventional stator core. FIG. 10 is a part of a cross section taken along line OO in FIG. 10 and corresponds to FIG. 9 in a conventional stator core.

  Embodiments according to the present invention will be described below in detail with reference to the accompanying drawings. In the following, when a plurality of embodiments and modifications are included, it is assumed from the beginning that a new embodiment is constructed by appropriately combining these characteristic portions. In the following description and drawings, the R direction represents the radial direction of the stator core 10 (core plate 30), the θ direction represents the circumferential direction of the stator core 10 (core plate 30), and the Z direction represents the stator core 10 ( It represents the axial direction (thickness direction) of the core plate 30). The X direction, the R direction, and the θ direction are orthogonal to each other.

  FIG. 1 is a plan view of a stator 1 according to an embodiment of the present invention when viewed from one side in the X direction, and FIG. 2 is a plan view when the core plate 30 is viewed from one side in the X direction. . In FIGS. 1 and 2, the inner and outer air holes 80 and 81 are exaggerated for easy understanding of the arrangement of the inner and outer air holes 80 and 81.

  As shown in FIG. 1, the stator 1 includes a stator core 10 and a stator coil 20. The stator core 10 is provided with a rotor accommodation hole 15 in the center. The stator core 10 includes an annular yoke 11 and a plurality of teeth 12 protruding inward in the R direction from the yoke 11 with a space therebetween in the θ direction. A slot 13 is provided between the teeth 12 adjacent in the θ direction. Stator coil 20 is wound around teeth 12 through slot 13. A rotor (not shown) is accommodated in the rotor accommodation hole 15.

  The stator core 10 includes a plurality of identically shaped core plates 30 stacked in the X direction. Referring to FIG. 2, each of the plurality of core plates 30 has the same shape, and the core plate 30 protrudes inward in the R direction from the yoke 31 and the yoke 31 in a state spaced from each other in the θ direction. A plurality of teeth 32 are provided. A slot 33 is provided between the teeth 32 adjacent to each other in the θ direction. The plurality of core plates 30 are stacked such that the yoke 31 and the teeth 32 overlap when viewed from the X direction. The yoke 31 includes a plurality of yokes 31 stacked in the X direction, and the tooth 12 includes a plurality of teeth 32 stacked in the X direction. The rotor housing holes 15 of the stator core 10 are formed by the plurality of rotor housing holes 35 overlapping in the X direction of the plurality of core plates 30, and the slots 13 of the stator core 10 are formed by the plurality of slots 33 overlapping in the X direction of the plurality of core plates 30. Is formed.

  As shown in FIG. 2, the core plate 30 has a plurality of pairs of inner circumferential air holes 80 and outer circumferential air holes 81, and the pair of inner circumferential air holes 80 and outer circumferential air holes 81 are in the θ direction. Formed at predetermined intervals. The pair of inner peripheral air holes 80 and outer peripheral air holes 81 are arranged at positions overlapping the teeth 32 when viewed from the R direction. Each of the inner and outer air holes 80 and 81 penetrates the core plate 30 in the X direction. In the state shown in FIGS. 1 and 2, with respect to the pair of inner peripheral air holes 80 and outer peripheral air holes 81, the inner peripheral air holes 80 are teeth with respect to the center α of the teeth 12 (the teeth 32) in the θ direction. 12 (tooth 32) is provided on one side (in the state shown in FIGS. 1 and 2, clockwise in the θ direction), and is provided on the inner peripheral side of the tooth 12 (tooth 32) in the R direction. On the other hand, with respect to the pair of inner circumferential air holes 80 and outer circumferential air holes 81, the outer circumferential air holes 81 are arranged on the one side of the teeth 12 (the teeth 32) with respect to the center α of the teeth 12 (the teeth 32) in the θ direction. Is provided on the opposite side (in the state shown in FIGS. 1 and 2, counterclockwise in the θ direction) and on the outer peripheral side of the inner peripheral air hole 80 in the R direction. More specifically, in the example shown in FIGS. 1 and 2, the outer peripheral air hole 81 is provided in the yoke 11 (yoke 31).

  FIG. 3 is a plan view showing a part of the stator core 10 in the θ direction. The inner and outer air holes 80 and 81 drawn in dotted lines in FIG. 3 are the inner and outer air holes 80 and 81 of the invisible core plate 30 adjacent to the visible core plate 30 in the X direction. Show. As shown in FIG. 3, in the stator 1, the inner peripheral side air hole 80 is in a state in which the first state core plate 30 is located on one side of the θ direction in the tooth 12 and the first state is turned over. The core plates 30 in the second state in which the inner peripheral side air holes 80 are located on the other side in the θ direction in the teeth 12 are alternately arranged in the X direction.

  4 is a cross-sectional view taken along line AA in FIG. 4 to 9 and FIG. 11, the burrs are exaggerated for easy understanding. As shown in FIG. 4, the core plate 30 has a burr 71 projecting on one side in the X direction (the lower side in the drawing of FIG. 4) at the inner peripheral side edge facing the rotor accommodation hole 35, and the outer peripheral side air A burr 72 projecting to one side in the X direction is provided at the opening edge of the hole 81. Further, the core plate 30 has a burr 73 protruding to the other side in the X direction (upper side in the drawing of FIG. 4) at the outer peripheral side edge, and protrudes to the other side in the X direction at the opening edge of the inner peripheral side air hole 80. Burr 74 is provided.

  These burrs 71 to 74 are generated due to the core plate 30 being manufactured by punching a magnetic steel sheet. Hereinafter, the manufacturing method of the core plate 30 is demonstrated using FIGS. FIG. 5A is a partial cross-sectional view in the axial direction in the middle of forming the inner peripheral side edge 90 (see FIG. 2) and the outer peripheral side air hole 81 in the electromagnetic steel sheet 41, and accommodates the rotor. 7 is a partial cross-sectional view in the axial direction in the middle of forming a hole 35, a slot 33, and an outer peripheral air hole 81. FIG. 5B is a partial cross-sectional view in the axial direction passing through the central axis of the outer peripheral side air hole 81 in the electromagnetic steel plate 41 after the inner peripheral side edge 90 and the outer peripheral side air hole 81 are formed. FIG. 6 is a schematic diagram for explaining the press direction and the burr forming direction when the outer peripheral air hole 81 is formed.

  As shown in FIG. 5A, when the inner peripheral edge 90 and the outer peripheral air hole 81 are formed in the electromagnetic steel plate 41, punches are formed on the front side surface (one side surface) 41a in the X direction of the electromagnetic steel plate 41. (Movable type) 51 is made to face, and the back side surface (the other side surface) 41b in the X direction of the electromagnetic steel plate 41 is supported by a die (fixed type) 52. The punch 51 is provided with an outer peripheral air hole forming portion 51a extending in the X direction at a position overlapping the outer peripheral air hole 81 forming position when viewed from the X direction. A concave portion 52a capable of accommodating the distal end side of the outer peripheral air hole forming portion 51a is provided at a location overlapping the forming portion 51a in the X direction. By punching the electromagnetic steel plate 41 with the punch 51 in the direction indicated by the arrow F from the front side surface 41a side, the rotor housing hole 35 and the outer peripheral side air hole 81 are formed. As shown in FIG. 5B, after punching out the electromagnetic steel sheet 41 with the punch 51, the inner peripheral side edge (the rotor receiving hole 35 and the edge of the slot 33) 90 of the electromagnetic steel sheet 41 supported by the die 52. A burr 71 is generated by shearing, and a burr 72 is generated at the opening edge of the outer peripheral air hole 81 by shearing. The burrs 71 and 72 protrude from the back side surface 41b of the electromagnetic steel plate 41 to one side in the X direction (the lower side in FIG. 5). As shown in FIG. 6, when the outer peripheral air hole 81 is formed, a force from the front side to the back side indicated by the arrow G acts on the electromagnetic steel plate 41 with a press. As a result, a burr 72 protruding to one side in the X direction (the lower side in FIG. 6) is generated in the outer peripheral air hole 81.

  Next, a method of forming the outer peripheral side edge 91 (see FIG. 2) and the inner peripheral side air hole 80 in the electromagnetic steel sheet 41 will be described. FIG. 7A is a partial cross-sectional view in the axial direction in the middle of forming the outer peripheral side edge 91 and the inner peripheral side air hole 80 in the electromagnetic steel sheet 41. FIG. 7B is a partial cross-sectional view in the axial direction passing through the central axis of the inner peripheral air hole 80 in the electromagnetic steel sheet 41 after the outer peripheral edge 91 and the inner peripheral air hole 80 are formed. .

  When the outer peripheral side edge portion 91 and the inner peripheral side air hole 80 are formed, as shown in FIG. 7A, the punch 61 is opposed to the front side surface 41 a of the electromagnetic steel plate 41, and the rear side surface of the electromagnetic steel plate 41. 41b is supported by the die 62. The die 62 is provided with an inner peripheral air hole forming portion 62a extending in the X direction at a position overlapping the inner peripheral air hole 80 forming position when viewed from the X direction. A concave portion 61a capable of accommodating the tip end side of the inner circumferential air hole forming portion 62a is provided at a location overlapping the side air hole forming portion 62a in the X direction. Then, when the electromagnetic steel sheet 41 is punched out from the front side surface 41a side by the punch 61 in the direction indicated by the arrow H, the outer peripheral side edge portion 91 and the inner peripheral side air hole 80 are formed. On the outer peripheral side edge 91 of the electromagnetic steel sheet 41 punched by the punch 61, a burr 73 is generated by shearing. Further, a burr 74 is generated by shearing at the opening edge of the inner peripheral air hole 80. The burrs 73 and 74 protrude from the front side surface 41a of the electromagnetic steel plate 41 to the other side in the X direction (upper side in FIG. 7).

  The core plate 30 is manufactured by punching the electromagnetic steel plate 41 described with reference to FIGS. In that case, it is possible to perform the punching process with the punch 61 after the punching process with the punch 51 first, or to perform the punching process with the punch 51 after performing the punching process with the punch 61 first. It is also possible.

  After the core plate 30 is manufactured, the plurality of core plates 30 are stacked in the X direction so that the first state and the second state appear alternately in the X direction without removing the burrs 71 to 74. . Then, an adhesive material such as resin (for example, varnish) is impregnated between the laminated core plates 30 to bond the core plates 30 adjacent in the X direction.

  8 and 9 are cross-sectional views in the axial direction during the impregnation of the adhesive material in the portion where the four core plates 30 are laminated in the stator core 10. FIG. 10 is a plan view of a conventional stator core 110, and FIG. 11 is a part of a cross section taken along the line OO of FIG. 10, corresponding to FIG.

  8 is a cross-sectional view taken along the line BB in FIG. 3, and a cross section of the two core plates 30 positioned on the lower side in the paper of FIG. The figure is a cross-sectional view taken along the line CC of FIG. 9 is a cross-sectional view taken along the line DD in FIG. 3 and is a cross-sectional view of the two core plates 30 positioned on the lower side in the paper of FIG. The figure is a cross-sectional view taken along the line EE of FIG. 8 corresponds to the uppermost core plate 30 shown in FIG. 3, and the uppermost core plate 30 shown in FIG. 3 corresponds to the core plate 30 disposed second from the top. Hereinafter, the adhesive material impregnation operation and the function and effect in the stator core 10 will be described with reference to FIGS.

  As shown in FIG. 11, in the conventional stator core 110, the radially outer circumferential side in the axial gap where the inner circumferential opening 185 is provided is closed by two opposed outer burrs 173, and conversely, the outer circumferential opening 186. The radially inner peripheral side of the axial clearance in which is provided is closed by two inner peripheral burrs 171 facing each other. Therefore, when the adhesive material 177 is impregnated and moved from the outer peripheral side to the inner peripheral side through the outer peripheral side opening 186 in the direction of arrow P, the air that is pushed out by the adhesive material 177 and flows to the inner peripheral side is impregnated. The two inner peripheral burrs 171 facing each other may be difficult to come out. Then, an air reservoir 174 may be generated on the inner peripheral side of the axial gap between the two core plates 130, and the adhesive material 177 may not easily reach the inner peripheral corner. Further, when the adhesive material 177 moves from the inner peripheral side to the outer peripheral side via the inner peripheral side opening 185 in the arrow Q direction, the air that is pushed out by the adhesive material 177 and flows to the outer peripheral side is The burr 173 may make it difficult to come out to the outside. Then, an air reservoir 175 may be generated on the outer peripheral side of the axial gap between the two core plates 130, and the adhesive material 177 may not easily reach the outer peripheral corner.

  On the other hand, in the stator core 10, as shown in FIG. 8, when the adhesive material 77 moves in the direction of arrow I from the outer peripheral side to the inner peripheral side through the outer peripheral side opening 86 during the impregnation of the adhesive material 77. After the air that has been pushed out and flows to the inner peripheral side flows in the axial gap between the core plates 30 adjacent to each other in the X direction through the inner peripheral air hole 80 in the directions indicated by arrows J and K, It flows out to the outside, and it becomes difficult to generate an air reservoir on the inner peripheral side of the axial gap between the core plates 30. Conversely, as shown in FIG. 9, when the adhesive material 77 moves from the inner peripheral side to the outer peripheral side through the inner peripheral side opening 85 in the direction of arrow L, it is pushed out by the adhesive material 77 and flows to the outer peripheral side. After the air flows in the axial gap between the core plates 30 adjacent to each other in the X direction through the outer peripheral air holes 81 in the directions indicated by arrows M and N, the air flows out to the outside, and the shaft between the core plates 30 Air pockets are less likely to be generated on the outer peripheral side of the directional gap. Therefore, the adhesive material 77 can easily reach the corners in the R direction between the core plates 130 adjacent in the axial direction, and the core plates 30 can be bonded to each other more reliably.

  Furthermore, in the core plate 30, an inner peripheral air hole 80 and an outer peripheral air hole 81 are provided in regions opposite to each other with respect to the center in the circumferential direction of the tooth 32, and the inner peripheral air hole 80 is further provided. The first state core plate 30 located on one side in the circumferential direction of the teeth 32 and the second state core plate 30 in which the inner circumferential air holes 80 are located on the other circumferential side of the teeth 32 are in the X direction. Are alternately arranged. Therefore, in a state where the plurality of core plates 30 are stacked, the inner peripheral air hole 80 does not overlap in the X direction, and the outer peripheral air hole 81 does not overlap in the X direction. Therefore, the burr 74 formed at the opening edge of the inner peripheral air hole 80 faces the X direction and does not block the air flow path, and the burr 72 formed at the opening edge of the outer peripheral air hole 81 The air flow path is not blocked by facing the X direction. As a result, it becomes easy for air to smoothly flow out to the outside through the inner and outer air holes 80 and 81, and from this point, the adhesive material 77 can easily reach the corners between the core plates 30 adjacent in the X direction. .

  The present invention is not limited to the above-described embodiment and its modifications, and various improvements and modifications can be made within the matters described in the claims of the present application and their equivalent ranges.

  For example, in the above embodiment, the case where the outer peripheral side air hole 81 is provided in the yoke 31 has been described. However, the outer peripheral side air hole only needs to be provided on the outer peripheral side rather than the inner peripheral side air hole, and is provided on the teeth. May be. The core plate may be provided with through holes for venting air in addition to the inner and outer peripheral air holes. When the core plate has N teeth (N is an integer), 2N holes are provided in the core plate. A larger number of air vent holes (including inner and outer air holes) may be provided.

  DESCRIPTION OF SYMBOLS 1 Stator, 10 Stator core, 11 York, 12 Teeth, 30 Core plate, 71, 72, 73, 74 Burr, 80 Inner peripheral side air hole, 81 Outer peripheral side air hole, 90 Inner peripheral side edge, 91 Outer peripheral side edge , X Thickness direction, θ circumferential direction, R radial direction, α teeth center.

Claims (1)

An annular yoke, and a stator core having a plurality of teeth protruding radially inward from the yoke in a circumferentially spaced state;
The stator core includes a plurality of core plates stacked in a thickness direction,
The core plate is
An inner peripheral edge having a burr protruding on one side in the thickness direction;
An outer peripheral side edge portion having a burr protruding on the other side in the thickness direction;
A burr projecting to the other side in the thickness direction is provided at an opening edge, and is located on one side of the tooth with respect to the center of the tooth in the circumferential direction, and on the inner circumferential side of the tooth in the radial direction. An inner peripheral air hole located;
A burr projecting to one side in the thickness direction is provided at the opening edge, and is located on the opposite side of the tooth from the one side with respect to the center of the tooth in the circumferential direction, and in the radial direction, the inner An outer peripheral air hole located on the outer peripheral side of the peripheral air hole, and
The core plate in the first state in which the inner peripheral side air hole is located on one side of the circumferential direction in the teeth, and the state in which the first state is turned over, A stator of a rotating electrical machine in which the core plates in a second state located on the other side in the circumferential direction in the teeth are alternately arranged in the thickness direction.

Images