JP2007274809A - Stator, and rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator capable of regulating movement of a coil to the inside of the coil in the stator diametrical direction of the coil and restraining an increase in the magnetic resistance of the teeth while ensuring ease of insertion of a side part of the coil into a slot, and to provide a rotating electric machine using the stator. <P>SOLUTION: The tooth 5 has engagement recessed portions 7 on side surfaces facing the slot 6 and a larger sectional area in the stator peripheral direction than that of the tip 5a of the tooth 5 over the whole area ranging from the tip 5a to the proximal end part 5b of the tooth 5. Further, the coil 4 has elastic protruding portions 8 projecting into the engagement recessed portions 7 for engagement at such a position as to meet the engagement recessed portions 7, on the side parts 4a of the coil 4. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is a stator comprising a stator core formed by arranging a plurality of teeth protruding inward in the circumferential direction of the stator, and a coil arranged with a coil side inserted in a slot formed between the teeth, And a rotating electric machine using the stator.

  Regarding a rotating electrical machine used as an electric motor or a generator, generally, a stator coil of a rotating electrical machine having a relatively large output often uses a die-wound coil formed in a ring shape of a predetermined shape in advance. Such a die coil is assembled by inserting the pair of coil sides into the slot from the radially inner side of the stator core. On the other hand, after the coil is assembled, a structure is required to prevent the coil side portion inserted into the slot from moving inward in the stator radial direction and interfering with the rotor. However, in the case of using the above-described coil-wound coil, in order to enable the insertion of the coil side into the slot while maintaining the slot occupancy of the coil, the vicinity of the opening at the stator radial inner end of the slot Further, it is impossible to provide a protrusion in the circumferential direction of the stator that hinders insertion of the coil side portion. Therefore, as shown in FIG. 13, grooves 104 extending in the stator axial direction are provided on both side surfaces of the teeth 103 in the vicinity of the opening of the slot 102 of the stator core 101, and the slot wedge 105 is inserted along the groove 104. A configuration that closes the opening of the slot 102 has been used (see, for example, Patent Document 1).

Japanese Patent No. 3514939 (page 3, FIG. 5)

  However, in the above-described configuration, the groove 104 that narrows the width of the teeth 103 in the circumferential direction of the stator 103 is provided in the entire region in the stator axial direction in the vicinity of the tip end portion (the inner end portion in the stator radial direction) of the teeth 103. The groove 104 reduces the cross-sectional area near the tip of the tooth 103 and increases the magnetic resistance. That is, when such a groove 104 is provided, the flow of magnetic flux passing through the inside of the tooth 103 is hindered, and there is a problem that the performance of the rotating electrical machine is degraded as compared with the case where the groove 104 does not exist.

  The present invention has been made in view of the above problems, and its purpose is to ensure the ease of insertion of the coil side portion into the slot while restricting the movement of the coil inward in the stator radial direction, Furthermore, it is providing the stator which can suppress the increase in the magnetic resistance of teeth, and the rotary electricity using the stator.

  In order to achieve the above object, according to the present invention, a stator core having a plurality of teeth protruding inward in the circumferential direction of the stator and a coil side portion inserted in a slot formed between the teeth are arranged. The feature of the stator including the coil is that the tooth includes an engaging recess on a side surface facing the slot, and the stator at the distal end in the entire region from the distal end to the proximal end of the tooth. The stator has a circumferential sectional area that is equal to or greater than the circumferential sectional area, and the coil includes an elastic convex portion that protrudes and engages in the engaging concave portion at a position corresponding to the engaging concave portion of the coil side portion. It is in.

  According to this characteristic configuration, since the elastic convex portion protrudes and engages in the engaging concave portion provided on the side surface of the tooth in a state where the coil side portion of the coil is inserted into the slot, the stator radial direction of the coil Inward movement can be restricted. This eliminates the need to provide a stator circumferential projection for restricting the movement of the coil inward in the radial direction of the stator in the vicinity of the opening of the slot, so that the coil side portion can be easily inserted into the slot. Can do. Further, the teeth are configured to have a stator circumferential cross-sectional area larger than that in the entire region from the tip end portion to the base end portion with the stator circumferential cross-sectional area at the tip end being minimized. An increase in the magnetic resistance of the teeth due to the provision of the engaging recess can be suppressed.

  Specifically, the teeth are formed so that the width in the circumferential direction of the stator becomes wider from the distal end portion toward the proximal end portion, and the engagement recesses are formed on the stator periphery of the distal end portion of the teeth. It is preferable that it is formed so as to be within a widened region wider than the width in the direction.

  If comprised in this way, even if it is a case where the engagement recessed part is provided in the said side surface of teeth, with respect to the cross-sectional area of the teeth, the stator circumferential direction of the distal end portion in the entire region from the distal end portion to the proximal end portion It can comprise so that a stator circumferential direction cross-sectional area more than a cross-sectional area may be provided. Therefore, an increase in the magnetic resistance of the teeth due to the provision of the engaging recess can be suppressed.

In addition, the present invention is particularly suitable when the coil is a die-wound coil formed in a ring shape with a predetermined shape in advance.
That is, there is no protrusion in the stator circumferential direction for restricting the movement of the coil inward in the radial direction of the stator in the vicinity of the opening of the slot. In addition, the coil side portion can be easily inserted into the slot while ensuring the maximum width of the coil side portion in the stator radial direction.

In addition, the coil includes a sheet member that covers the coil side from the inner side in the stator radial direction, and the elastic convex portion has a part of the sheet member at a position corresponding to the engaging concave portion on the engagement concave portion side. It is preferable that it is formed so as to be bent so as to protrude to the side.
If comprised in this way, the said elastic convex part can be provided by the comparatively simple structure which bends a part of sheet | seat member covered on the said coil side part.

  More specifically, it is preferable that the elastic convex portion is formed by folding back a stator radial direction outer end portion of a portion of the sheet member disposed along the side surface of the teeth.

Moreover, it is preferable that the sheet member is an insulating sheet wound around the coil side portion.
A configuration in which insulation between the coil and the stator core is ensured by winding an insulating sheet around the coil side portion is generally used. Therefore, according to this structure, a new member is not required in order to provide the said elastic convex part, and the said elastic convex part can be comprised at low cost.

  The coil has a configuration in which the coil side portion is resin-molded, and the elastic convex portion is formed to protrude toward the engagement concave portion by the resin mold at a position corresponding to the engagement concave portion. It is preferable.

  If comprised in this way, when the coil side part is resin-molded, the said elastic convex part can also be shape | molded simultaneously. Therefore, a new member or the like is not required to provide the elastic convex portion, and the elastic convex portion can be configured at a low cost.

  The coil is configured by winding a conductive wire around a resin bobbin that is externally fitted to the tooth, and the elastic convex portion is located at a position corresponding to the engagement concave portion on the inner peripheral surface of the resin bobbin. It is preferable that the configuration is provided so as to protrude toward the combined recess.

  If comprised in this way, the elastic convex part provided in the internal peripheral surface of the resin bobbin will protrude and engage in an engagement recessed part by externally fitting a resin bobbin to the teeth of a stator core. Therefore, also when using the coil comprised by winding conducting wire around a resin bobbin, the movement to the stator radial direction inner side of the said coil can be controlled.

  The characteristic configuration of the rotating electrical machine according to the present invention is that it includes a stator having the above-described configurations and a rotor that is held so as to be relatively rotatable with respect to the stator.

  According to this characteristic configuration, it is possible to suppress an increase in the magnetic resistance of the teeth while restricting the movement of the coil inward in the stator radial direction. Therefore, a high-performance rotating electrical machine can be realized.

[First embodiment]
A first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing an overall configuration of a rotating electrical machine 1 according to the present embodiment. The rotating electrical machine 1 is an electric motor that performs input / output of three-phase alternating current of U phase, V phase, and W phase and a synchronous machine that functions as a generator (synchronous motor, synchronous generator). FIG. 2 is a perspective view showing the configuration of the stator 2 of the rotating electrical machine 1. As shown in this figure, the stator 2 includes a coil core 4a in a slot 6 formed between a stator core 3 formed by arranging a plurality of teeth 5 protruding inward in the stator circumferential direction D1 and the teeth 5. And a coil 4 that is inserted and arranged. As shown in FIG. 3 to FIG. 5, the stator 2 is configured to restrict the movement of the coil 4 to the inside of the stator radial direction D <b> 2. An elastic convex portion 8 that engages with the mating concave portion 7 is provided. The present invention is characterized by a configuration for restricting the movement of the coil 4 inward in the stator radial direction D2. Hereinafter, the configuration of each part of the rotating electrical machine 1 will be described in detail.

1. Configuration of Rotating Electric Machine 1 As shown in FIG. 1, the rotating electric machine 1 includes a stator 2, a rotor 11, and a housing 12 in this example. The stator 2 constitutes the armature of the rotating electrical machine 1. The stator 2 is fixed to the inner peripheral surface of the housing 12. The configuration of the stator 2 will be described in detail later. In addition, a rotor 11 as a field magnet provided with a permanent magnet is disposed on the radially inner side of the stator 2 so as to be rotatable relative to the stator 2. As for this rotor 11, the rotating shaft 11a is hold | maintained so that rotation with respect to the housing 12 is possible via the bearing 12a. The housing 12 is formed in a cylindrical shape in which wall portions 12b are provided on both sides in the axial direction. And the bearing 12a is attached to the radial direction center part of the wall part 12b. In the example shown in FIG. 1, one (left side in the figure) wall portion 12 b is separable from the main body portion of the housing 12.

2. Overall Configuration of Stator 2 As shown in FIG. 2, the stator 2 includes a stator core 3 formed by arranging a plurality of teeth 5 projecting toward the inner peripheral side in the stator circumferential direction D <b> 1, and slots formed between the teeth 5. 6 is configured by arranging a plurality of coils 4 in which the coil side portions 4a are inserted in the stator circumferential direction D1.

  The stator core 3 is configured by laminating a plurality of electromagnetic steel plates, and is formed in a substantially cylindrical shape. In addition, a plurality of teeth 5 protruding on the inner peripheral side (inner side of the stator radial direction D2) are arranged on the inner peripheral surface of the stator core 3 at predetermined circumferential intervals. Each tooth 5 is formed in the same cross-sectional shape along the stator axial direction D3. The shape of each tooth 5 will be described in detail later. In this example, 24 teeth 5 are provided on the entire circumference of the stator core 3. Further, a plurality of slots 6 extending in the stator axial direction D <b> 3 are provided between the teeth 5 at intervals corresponding to the width of the teeth 5. Each slot 6 has the same cross-sectional shape and has a predetermined width and depth.

3. Next, the configuration of the coil 4, the teeth 5, and the slot 6, which is the characteristic configuration of the present embodiment, will be described in detail. FIG. 3 is a cross-sectional view showing the arrangement of the coil 4 and the insulating sheet 9 in the slot 6 of the stator 2 according to this embodiment. FIG. 4 is a perspective view showing the shape of the teeth 5 of the stator core 3 according to the present embodiment. FIG. 5 is a perspective view showing the configuration of the coil 4 and the insulating sheet 9. As shown in these drawings, in the present embodiment, the tooth 5 includes an engagement recess 7 on a side surface facing the slot 6 and is disposed in the entire region from the distal end portion 5a to the proximal end portion 5b of the tooth 5. The stator circumferential cross-sectional area of the tip 5a is equal to or larger than the stator circumferential cross-sectional area Sa (see FIG. 4). Moreover, the coil 4 is provided with the elastic convex part 8 which protrudes and engages in the engagement recessed part 7 in the position corresponding to the engagement recessed part 7 of the coil side part 4a.

  Here, as shown in FIGS. 3 and 4, each tooth 5 is formed such that the width w <b> 5 in the stator circumferential direction D <b> 1 becomes wider from the distal end portion 5 a toward the proximal end portion 5 b. That is, in this example, the teeth 5 are formed in a substantially trapezoidal cross section in which the width w5b of the base end portion 5b is wider than the width w5a of the distal end portion 5a except for the portion where the engaging recess 7 is formed.

  And the engagement recessed part 7 is formed in the both sides | surfaces which face the slot 6 of each tooth | gear 5. FIG. In this example, the engagement recess 7 is formed in a substantially wedge shape in cross section. More specifically, the cross-sectional shape of the portion constituting the engaging recess 7 on the side surface of the tooth 5 is formed so as to be substantially L-shaped obliquely with respect to the other portion on the side surface of the tooth 5. . As a result, a stepped portion 7a is formed in the vicinity of the inner end of the engaging recess 7 in the stator radial direction D2. As will be described later, the stepped portion 7a constitutes an abutting surface on which the tip 8a of the elastic convex portion 8 abuts and is locked. In this example, the engagement recess 7 is formed in the same manner in the entire region of the tooth 5 in the stator axial direction D3. That is, the teeth 5 are formed so as to have the same cross-sectional shape at any position in the stator axial direction D3 including the engaging recess 7.

  Further, the engaging recess 7 is formed so as to be accommodated in the widened area A wider than the width w5a of the tip 5a of the tooth 5 in the stator circumferential direction D1. Here, specifically, the widened region A is parallel to the widthwise central plane Pc of the tooth 5 passing through the axis O (see FIG. 2) of the stator 2 as shown by hatching in FIG. Thus, it is a region on the outer side in the width direction of the tooth 5 with respect to a virtual surface Pv passing through the edge in the width direction (stator circumferential direction D1) of the tip portion 5a. Then, the engaging recess 7 is formed so that the deepest position of the depth d7 in the stator circumferential direction D1 is located outside the virtual surface Pv in the width direction of the tooth 5 so that it can be accommodated in the widened region A. Is formed. By the way, as described above, the tooth 5 has the width w5b of the base end portion 5b wider than the width w5a of the tip end portion 5a so that the width w5 of the stator circumferential direction D1 increases from the tip end portion 5a toward the base end portion 5b. The cross section is formed in a substantially trapezoidal shape. Therefore, in this example, the engagement recess 7 is provided in the vicinity of the base end portion 5b of the tooth 5 where the widened region A is wide, that is, the stator diameter of the slot 6, so that the depth in the stator circumferential direction D1 can be ensured. It is provided in a region outside the direction D2.

  As described above, the engagement concave portion 7 is formed so as to be accommodated in the widened region A on the base end portion 5b side that is formed wider than the width w5a of the distal end portion 5a of the tooth 5 in the stator circumferential direction D1. The teeth 5 have the same cross-sectional shape at any position in the stator axial direction D3. As a result, the teeth 5 have a stator circumferential cross-sectional area greater than or equal to the stator circumferential cross-sectional area Sa (see FIG. 4) of the front end 5a in the entire region from the front end 5a to the base end 5b. . Therefore, by providing the engagement recess 7, a portion having a small cross-sectional area of the tooth 5 is not formed, and an increase in magnetic resistance of the tooth 5 can be suppressed.

  Here, as shown in FIG. 5, the coil 4 is a die-wound coil configured by winding a conducting wire 41 a plurality of times. The coil 4 includes a pair of coil side portions 4a formed in a straight line and a coil end portion 4b connecting between the pair of coil side portions 4a. As shown in FIG. 2, each coil side portion 4 a is inserted and arranged in the slot 6 of the stator core 3. In this example, one coil side portion 4 a is accommodated in one slot 6. The coil end 4b is arranged so as to protrude from both ends of the stator core 3 in the axial direction D3. In FIG. 2, in order to avoid complexity, only the coil end 4b of some coils 4 is shown, and the other coils 4 show only the cross section. In the entire stator 2, a plurality of (in this example, 12) coils 4 are arranged along the stator circumferential direction D1.

  As shown in FIGS. 3 and 5, the insulating sheet 9 is wound around the coil side 4 a of the coil 4. In this example, the insulating sheet 9 is configured by combining a first insulating sheet 91 and a second insulating sheet 92. That is, the second insulating sheet 92 is formed in a substantially U-shaped cross section and is wound so as to cover a part of the stator radial direction outer side surface and both side surfaces of the coil side portion 4a. The first insulating sheet 91 is formed in a substantially U-shaped cross section having a greater depth in the stator radial direction D2 than the second insulating sheet 92, and covers most of the inner side surface and both side surfaces of the coil side portion 4a in the stator radial direction. It is wound like so. At this time, the side surface portion of the first insulating sheet 91 is disposed so as to cover the outer side of the stator circumferential direction D <b> 1 than the side surface portion of the second insulating sheet 92. The first insulating sheet 91 and the second insulating sheet 92 are preferably temporarily fixed with an adhesive or the like so as not to be separated from each other in the overlapping region of the side surface portions. In this example, the first insulating sheet 91 functions as a sheet member that covers the coil side 4a from the inside of the stator radial direction D2. In addition, as a material of this insulating sheet 9 (the 1st insulating sheet 91 and the 2nd insulating sheet 92), the composite sheet of the 3 layer structure etc. which joined the heat-resistant sheet | seat which used the polyamide resin as a raw material with the adhesive agent etc., for example Can be used.

  And the elastic convex part 8 is formed in the position corresponding to the engaging recessed part 7 by bending so that a part of insulating sheet 9 may protrude to the engaging recessed part 7 side. In this example, the elastic convex portion 8 is formed by folding back a stator radial direction outer end portion of the first insulating sheet 91 along the side surface of the tooth 5 into a V-shaped cross section. That is, the elastic convex portion 8 is formed so as to protrude or retract in the stator circumferential direction D1 by utilizing the elasticity of the base portion 8b formed by bending the first insulating sheet 91. As shown in FIG. 3, the distal end portion 8 a of the elastic convex portion 8 is brought into contact with and engaged with the stepped portion 7 a of the engaging concave portion 7 while protruding into the engaging concave portion 7. Thereby, it is controlled that the coil side part 4a moves inside the stator radial direction D2. On the other hand, when the coil side portion 4a is inserted into the slot 6, the elastic convex portion 8 can be in a state substantially parallel to the side surface of the coil side portion 4a, so that the coil side portion 4a can be easily inserted into the slot 6. Can do.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. FIG. 6 is a cross-sectional view showing the arrangement of the coil 4, the insulating sheet 9, and the locking sheet member 16 in the slot 6 of the stator 2 according to the present embodiment. FIG. 7 is a perspective view showing the shape of the teeth 5 of the stator core 3 according to this embodiment. FIG. 8 is a perspective view showing configurations of the coil 4, the insulating sheet 9, and the locking sheet member 16. As shown in these drawings, the stator 2 according to the present embodiment is the above in that the elastic convex portion 8 is formed not on the insulating sheet 9 but on the locking sheet member 16 provided outside the insulating sheet 9. Different from the first embodiment. Further, the shape of the engaging recess 7 is also different from the shape of the elastic protrusion 8 formed on the locking sheet member 16. Hereinafter, differences from these first embodiments will be described in detail.

  In the present embodiment, as shown in FIG. 7, the engagement recess 7 is formed in a part of the stator axial direction D <b> 3 on the side surface facing the slot 6 of the tooth 5. That is, as in the first embodiment, the engaging recess 7 is not formed in the entire stator axial direction D3 of the tooth 5, but is formed only in a part of the stator axial direction D3. In this example, the engagement recess 7 is formed at the center of the tooth 5 in the stator axial direction D3. Therefore, the teeth 5 are formed to have different cross-sectional shapes depending on the position in the stator axial direction D3. Such engagement recesses 7 are formed by making the shapes of some of the electromagnetic steel plates laminated to form the stator core 3 different from the shapes of the other electromagnetic steel plates. Can do. That is, in the case of this example, the shape of the number of electrical steel sheets corresponding to the height h7 in the stator axial direction D3 of the engaging recess 7 laminated at the central part in the stator axial direction D3 is changed to other electrical steel sheets. To be different. Specifically, with respect to the electromagnetic steel sheet at the center, a part of the base 5 on the side of the base end 5b of the tooth 5 recedes inward in the width direction of the tooth 5 by the depth d7 (see FIG. 6) of the engaging recess 7. Shape. Other configurations such as the cross-sectional shape of the engaging recess 7 and the arrangement in the stator radial direction D2 are the same as those in the first embodiment.

  As shown in FIGS. 6 and 8, an insulating sheet 9 is wound around the coil side portion 4a of the coil 4, and a locking sheet member 16 is formed from the inner side in the stator radial direction of the coil side portion 4a. It is covered. In this example, the insulating sheet 9 is composed of a single sheet. And this insulating sheet 9 is wound so that the perimeter of the coil side part 4a may be covered, and it is arrange | positioned so that it may overlap with one side surface of the coil side part 4a. Further, it is preferable that the overlapping area of the side surface portions of the insulating sheet 9 is temporarily fixed with an adhesive or the like so as not to be separated from each other.

  The locking sheet member 16 is constituted by a belt-like member formed in a substantially U shape having a large depth in the stator radial direction D2. As a material of the locking sheet member 16, for example, a metal plate, a synthetic resin plate, an insulating sheet similar to the above, or the like can be used. The locking sheet member 16 is disposed so as to cover the coil side 4a around which the insulating sheet 9 is wound from the inside of the stator radial direction D2. Thus, the three sides constituting the substantially U-shape of the locking sheet member 16 are arranged so as to be in contact with the inner side surface and both side surfaces of the coil side portion 4a in the stator radial direction via the insulating sheet 9, respectively. It will be. In this example, the locking sheet member 16 functions as a sheet member in the present invention.

  And the elastic convex part 8 is formed in the position corresponding to the engaging recessed part 7 by bending so that a part of locking sheet member 16 may protrude to the engaging recessed part 7 side. In this example, the elastic convex portion 8 is formed by folding back the stator radial direction outer end portion of the portion of the locking sheet member 16 disposed along the side surface of the tooth 5 into a V-shaped cross section. That is, the elastic convex portion 8 is formed so as to protrude or retract in the stator circumferential direction D1 by utilizing the elasticity of the base portion 8b formed by bending the locking sheet member 16. As shown in FIG. 6, the distal end portion 8 a of the elastic convex portion 8 is brought into contact with and engaged with the stepped portion 7 a of the engaging concave portion 7 while protruding into the engaging concave portion 7. Thereby, it is controlled that the coil side part 4a moves inside the stator radial direction D2. On the other hand, when the coil side portion 4a is inserted into the slot 6, the elastic convex portion 8 can be in a state substantially parallel to the side surface of the coil side portion 4a, so that the coil side portion 4a can be easily inserted into the slot 6. Can do.

[Third embodiment]
Next, a third embodiment of the present invention will be described. FIG. 9 is a cross-sectional view showing the arrangement of the coils 4 in the slots 6 of the stator 2 according to this embodiment. FIG. 10 is a perspective view showing the configuration of the coil 4. As shown in these drawings, the stator 2 according to the present embodiment includes the coil side portion 4a of the coil 4 that is resin-molded, and the elastic convex portion 8 is also formed of the resin mold. Different from the embodiment. The configuration of the engaging recess 7 according to this embodiment is the same as the configuration shown in FIG. 7 according to the second embodiment. Hereinafter, differences from the first embodiment will be described in detail.

  As shown in FIGS. 9 and 10, the coil side 4 a of the coil 4 is formed by resin molding so that the coil side 4 a constituting the coil side 4 a is formed into a columnar shape having a substantially rectangular cross section that matches the shape of the slot 6. The bundle is formed by integrally solidifying with a mold resin M. And the elastic convex part 8 is comprised by protrudingly forming the mold resin M to the engagement recessed part 7 side by the resin mold in the position corresponding to the engaging recessed part 7 provided in the teeth 5. FIG. In this example, the elastic convex portion 8 is formed in a rectangular flat plate shape that extends obliquely from both side surfaces of the coil side portion 4a to the inside of the stator radial direction D2. The elastic convex portion 8 is formed so as to protrude or retract in the stator circumferential direction D1 by utilizing the elasticity of the mold resin M in the vicinity of the base portion 8b connected to the side surface of the coil side portion 4a. In addition, this elastic convex part 8 is integrally shape | molded with the same mold resin M simultaneously with the resin molding of the coil side part 4a. As shown in FIG. 9, the distal end portion 8 a of the elastic convex portion 8 is brought into contact with and engaged with the stepped portion 7 a of the engaging recess 7 while protruding into the engaging recess 7. Thereby, it is controlled that the coil side part 4a moves inside the stator radial direction D2.

  Further, on the side of the coil side portion 4a facing the elastic convex portion 8, there is a rectangular concave portion 8c for reducing protrusion from the side surface of the coil side portion 4a when the elastic convex portion 8 is retracted in the stator circumferential direction D1. It is formed by a resin mold. As a result, when the coil side 4a is inserted into the slot 6, the elastic convex portion 8 can be substantially parallel to the side surface of the coil side 4a, so that the coil side 4a can be easily inserted into the slot 6. Can do.

[Fourth embodiment]
Next, a fourth embodiment of the present invention will be described. FIG. 11 is a cross-sectional view showing the arrangement of the coils 4 in the slots 6 of the stator 2 according to this embodiment. FIG. 12 is a perspective view showing the configuration of the coil 4. As shown in these drawings, the stator 2 according to the present embodiment is configured by winding a conducting wire 41 around a resin bobbin 17 in which a coil 4 is fitted around a tooth 5, and an elastic convex portion 8 is formed on the resin bobbin 17. It differs from said 1st embodiment by the point provided in the position corresponding to the engagement recessed part 7 of an internal peripheral surface so that it may protrude to the engagement recessed part 7 side. The configuration of the engaging recess 7 according to this embodiment is the same as the configuration shown in FIG. 7 according to the second embodiment. Hereinafter, differences from the first embodiment will be described in detail.

  As shown in FIGS. 11 and 12, the coil 4 is configured by winding a conducting wire 41 around a resin bobbin 17. The resin bobbin 17 includes a cylindrical bobbin main body 17a having a substantially rectangular cross section, and flange portions 17b provided at both ends of the bobbin main body 17a. The conducting wire 41 is wound around the outer periphery of the bobbin main body 17a. As shown in FIG. 11, the resin bobbin 17 is externally fitted to the tooth 5 in a state where the tooth 5 is inserted into the internal space of the substantially rectangular cross section on the inner peripheral side of the resin bobbin 17. In this example, the portion disposed along the long side of the bobbin main body 17 a constitutes the coil side portion 4 a disposed in the slot 6. Further, the portion disposed along the end side of the bobbin main body 17a constitutes a coil end portion 4b that protrudes from both end portions of the stator core 3 in the axial direction D3.

  And the elastic convex part 8 is provided in the position corresponding to the engagement recessed part 7 of the internal peripheral surface 17c of the resin bobbin 17 so that it may protrude to the engagement recessed part 7 side. In this example, the elastic convex portion 8 is formed in a rectangular flat plate shape that extends obliquely inward from the two surfaces facing the stator circumferential direction D1 on the inner circumferential surface 17c of the resin bobbin 17 in the stator radial direction D2. ing. The elastic convex portion 8 is formed so as to protrude or retract in the stator circumferential direction D1 by utilizing the elasticity of the resin in the vicinity of the base portion 8b connected to the inner peripheral surface 17c of the resin bobbin 17. The elastic convex portion 8 is integrally formed with the same resin simultaneously with the formation of the resin bobbin 17. Then, as shown in FIG. 11, the distal end portion 8 a of the elastic convex portion 8 is brought into contact with the stepped portion 7 a of the engaging concave portion 7 in a state of protruding into the engaging concave portion 7 and is locked. Thereby, it is controlled that the coil 4 moves inside the stator radial direction D2.

  Further, on the inner peripheral surface 17c side of the resin bobbin 17 facing the elastic convex portion 8, a rectangular concave portion for reducing the protrusion from the inner peripheral surface 17c when the elastic convex portion 8 is retracted in the stator circumferential direction D1. 8c is formed of a resin mold. As a result, when the resin bobbin 17 is externally fitted to the tooth 5, the elastic convex portion 8 can be substantially parallel to the inner peripheral surface 17 c, so that the resin bobbin 17 can be easily externally fitted to the tooth 5. .

[Other Embodiments]
(1) In each of the above-described embodiments, as shown in FIG. 3, the engaging recesses 7 on both sides in the width direction of the tooth 5 are all wider than the width w5a in the stator circumferential direction D1 of the tip portion 5a of the tooth 5. The case where it is formed so as to be within the widened area A has been described. However, the configuration of the engagement recess 7 is not limited to this. That is, even in the case where the engagement recess 7 is provided, the stator circumference is equal to or greater than the stator circumferential direction sectional area Sa (see FIG. 4) of the tip 5a in the entire region from the tip 5a to the base 5b of the tooth 5. If the directional cross-sectional area is provided, an increase in the magnetic resistance of the teeth 5 can be suppressed. Therefore, for example, even when the depth of either one of the engagement recesses 7 on both sides in the width direction of the tooth 5 is increased and the depth is entered from the widened region A to the inside in the width direction of the tooth 5, What is necessary is just to form the depth of the other engagement recessed part 7 so shallowly. Moreover, it is also preferable to arrange the engaging recesses 7 formed on both side surfaces of one tooth 5 at different positions in the stator radial direction D2. If comprised in these, the stator circumferential direction cross-sectional area in each position of the stator radial direction D2 can be ensured more than the stator circumferential direction cross-sectional area Sa of the front-end | tip part 5a of the teeth 5, and the magnetic resistance of the teeth 5 can be ensured. The increase can be suppressed.

(2) In the first and second embodiments described above, a case where the elastic convex portion 8 is formed by folding back the outer end portion in the stator radial direction of the insulating sheet 9 or the locking sheet member 16 as a sheet member will be described. did. However, the structure of the elastic convex part 8 is not limited to this. That is, forming the elastic convex portion 8 by bending a part of the sheet member, for example, in a mountain shape at a position corresponding to the engaging concave portion 7 is also one preferred embodiment. Similarly, in the third and fourth embodiments described above, it is also one of the preferred embodiments that the elastic convex portion 8 formed of resin is formed into a mountain-shaped convex shape.

(3) In said 3rd embodiment, the case where the elastic convex part 8 was formed with the mold resin M used for a resin mold was demonstrated. However, the structure of the elastic convex part 8 is not limited to this. For example, the elastic convex portion 8 is a member different from the mold resin M such as a metal plate, and the elastic convex portion 8 is coiled by performing resin molding of the coil side portion 4a in a state where the elastic convex portion 8 is disposed in the mold. It is one of the preferred embodiments that it is formed integrally with 4a. Similarly, in the fourth embodiment, the elastic convex portion 8 is a member different from the resin of the resin bobbin 17 and is integrally formed when the resin bobbin 17 is molded. .

(4) In the above embodiments, the case where the rotating electrical machine 1 is a synchronous machine has been described as an example. However, the present invention can also be suitably used when the rotating electrical machine is an induction machine such as an induction motor or an induction generator.

  The present invention can be applied to a stator of a rotating electrical machine used as an electric motor or a generator, and a rotating electrical machine using the stator.

Sectional drawing which shows the whole structure of the rotary electric machine which concerns on embodiment of this invention. The perspective view which shows the structure of the stator of the rotary electric machine which concerns on embodiment of this invention. It is sectional drawing which shows arrangement | positioning of the coil in the slot which concerns on 1st embodiment of this invention, and an insulating sheet. The perspective view which shows the shape of the teeth of the stator core which concerns on 1st embodiment of this invention. The perspective view which shows the structure of the coil and insulating sheet which concern on 1st embodiment of this invention. Sectional drawing which shows arrangement | positioning of the coil in the slot which concerns on 2nd embodiment of this invention, an insulating sheet, and the sheet | seat member for latching The perspective view which shows the shape of the teeth of the stator core which concerns on 2nd embodiment of this invention. The perspective view which shows the structure of the coil which concerns on 2nd embodiment of this invention, an insulating sheet, and the sheet | seat member for latching. Sectional drawing which shows arrangement | positioning of the coil in the slot which concerns on 3rd embodiment of this invention. The perspective view which shows the structure of the coil which concerns on 3rd embodiment of this invention. Sectional drawing which shows arrangement | positioning of the coil in the slot which concerns on 4th embodiment of this invention The perspective view which shows the structure of the coil which concerns on 4th embodiment of this invention. Sectional drawing which shows the structure of the stator which concerns on background art

Explanation of symbols

1: Rotating electric machine 2: Stator 3: Stator core 4: Coil 4a: Coil side 41: Conductor 5: Teeth 5a: Teeth tip 5b: Teeth proximal end 6: Slot 7: Engaging recess 8: Elastic convex 9: Insulating sheet 91: First insulating sheet (sheet member)
11: Rotor 16: Locking sheet member (sheet member)
17: Resin bobbin A: Widened region D1: Stator circumferential direction D2: Stator radial direction Sa: Stator circumferential direction cross-sectional area w5: Teeth width w5a: Teeth tip width

Claims (9)

A stator comprising a stator core formed by arranging a plurality of teeth protruding inward in the circumferential direction of the stator, and a coil having a coil side inserted in a slot formed between the teeth,
The tooth includes an engagement recess on a side surface facing the slot, and has a stator circumferential cross-sectional area that is equal to or greater than the stator circumferential cross-sectional area of the distal end in the entire region from the distal end to the proximal end of the tooth. Prepared,
The said coil is provided with the elastic convex part which protrudes and engages in the said engagement recessed part in the position corresponding to the said engagement recessed part of the said coil side part. The teeth are formed such that the width in the circumferential direction of the stator increases from the distal end toward the proximal end.
2. The stator according to claim 1, wherein the engagement recess is formed so as to be accommodated in a widened region wider than a width of the tip end portion of the teeth in a circumferential direction of the stator.   The stator according to claim 1 or 2, wherein the coil is a die-wound coil formed in a ring shape having a predetermined shape in advance. The coil includes a sheet member that covers the coil side from the inside in the stator radial direction,
The said elastic convex part is formed by bending so that a part of said sheet | seat member may protrude to the said engaging recessed part side in the position corresponding to the said engaging recessed part. Stator.   5. The stator according to claim 4, wherein the elastic convex portion is formed by folding back a radially outer end portion of the stator in a portion of the sheet member that is disposed along the side surface of the tooth.   The stator according to claim 4 or 5, wherein the sheet member is an insulating sheet wound around the coil side portion. The coil has a resin-molded side of the coil,
The stator according to any one of claims 1 to 3, wherein the elastic convex portion is formed to protrude toward the engaging concave portion by the resin mold at a position corresponding to the engaging concave portion. The coil is configured by winding a conductive wire around a resin bobbin that is externally fitted to the teeth,
The said elastic convex part is provided in the position corresponding to the said engagement recessed part of the internal peripheral surface of the said resin bobbin so that it may protrude to the said engagement recessed part side. Stator.   A rotating electrical machine comprising the stator according to any one of claims 1 to 8 and a rotor held so as to be relatively rotatable with respect to the stator.

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