JP2012019574A - Salient pole concentration winding stator of electric motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a salient pole concentration winding stator of a electric motor capable of preventing fretting among a plurality of windings of a cross-over part and preventing the peel of coating of the windings.SOLUTION: In a salient pole concentration winding stator of a electric motor, a first cross-over part holding part 41 that holds a cross-over part 15T of a first winding edge 21 side includes a first tangling part 51 and a second tangling part 52. A second cross-over part holding part 42 that holds the cross-over part 15T of a second winding edge 22 side includes a third tangling part 53 and a fourth tangling part 54. Coil abutment parts in the first to fourth tangling parts 51 to 54 have a width in which at least a plurality of windings 15a of a bundle wire 15 can be disposed in parallel longitudinally. In at least part of the coil abutment part, grooves 61, 62, 65, and 66 are provided to separate each winding 15a of the bundle wire 15 for holding them. Between the second tangling part 52 and the first winding edge 21 and between the third tangling part 53 and the second winding edge 22, a twist section 23 is provided in which the parallel direction of the plurality of windings 15a of the bundle wire 15 is twisted from a lamination direction to the longitudinal direction.

Description

  The present invention relates to a salient pole concentrated winding stator of an electric motor mounted on an electric vehicle.

  As a conventional stator of an electric motor or a generator, the stator includes a pair of insulating members mounted so as to cover both ends in the axial direction of the magnetic teeth of the stator core, and one end side of the plurality of windings is connected to the insulating member. Either one of the back surfaces extends to the base side along the longitudinal direction of the magnetic teeth, and is arranged and fixed in a row in the width direction of the magnetic teeth, and the other end of each winding is arranged in the longitudinal direction of the magnetic teeth. Formed by shifting the position sequentially and bending it in the width direction, winding both windings together with a predetermined number of layers together with both insulating members as the core, and electrically connecting the windings in parallel. One having a plurality of stator coils is known (for example, see Patent Document 1).

JP 2004-80902 A

  By the way, in the stator described in the above-mentioned Patent Document 1, since the crossing portions respectively connecting a plurality of coils are constituted by a plurality of windings, fretting due to vibration occurs between the plurality of windings of the crossing portions. As a result, there is a possibility that the coating of the winding is peeled off.

  The present invention has been made in view of the above-described problems, and the object thereof is to prevent fretting between a plurality of windings in a transition portion and to prevent the coating of the windings from being peeled off. An object of the present invention is to provide a salient pole concentrated winding stator for an electric motor.

In order to achieve the above object, the invention according to claim 1
A stator core (for example, a stator core 11 in an embodiment described later);
A bundle wire (for example, a bundle wire 15 in an embodiment described later) in which at least two or more windings (for example, a winding 15a in the embodiment described later) are bundled, and
A winding part (for example, a winding part 20 in an embodiment described later) formed by winding the bundled wire and stacked while the bundled wire is wound in an annular shape, and the bundle of the winding part A first winding end (for example, a first winding end 21 in an embodiment described later) that is a stator outer diameter side end of a wire, and a second winding end that is a stator inner diameter side end of the bundled wire of the winding portion (For example, the second winding end 22 in the embodiment described later), and a coil (for example, the coil 14 in the embodiment described later),
An electric motor in which a split core (for example, a split core 12 in an embodiment described later) formed by using an insulator (for example, an insulator 13 in an embodiment described later) that holds the coil is connected in a plurality of rings. For example, a salient pole concentrated winding stator (for example, a stator 10 in an embodiment described later) of an outer rotor type electric motor 1) in an embodiment described later,
A crossover portion (for example, a crossover portion 15T in the embodiment described later) that connects the first winding end of the coil and the second winding end of a different coil;
The winding portion has a stator radial direction as a stacking direction, and the windings constituting the bundled wire are stacked while being wound along a trunk portion of the insulator (for example, a trunk portion 30 in an embodiment described later). Being
The insulator is
A first transition part holding part (for example, a first transition part holding part 41 in an embodiment described later) that holds the transition part on the first winding end side;
A second transition part holding part that holds the transition part on the second winding end side (for example, a second transition part holding part 42 in an embodiment described later),
The first crossover holding section is
An inclined surface having a mountain shape that is guided from the stator inner diameter side to the stator outer diameter side in the same direction as the winding direction of the coil and has a vertex portion (for example, a vertex portion P in an embodiment described later) on the stator outer diameter side. A first binding portion (for example, a first binding portion 51 in an embodiment described later) having a stator outer diameter side portion of the transition portion (for example, an inclined surface 51a in the embodiment described later). ,
A second binding portion (for example, a first binding portion in an embodiment described later) that is disposed to face the first binding portion and holds a stator inner diameter side portion of the transition portion held by the first transition portion holding portion. 2 binding portions 52),
The second crossover holding section is
A third binding that has an inclined surface (for example, an inclined surface 53a in an embodiment described later) that guides from the stator inner diameter side to the stator outer diameter side in the same direction as the winding direction of the coil, and holds the transition portion. A part (for example, a third binding part 53 in an embodiment described later),
A fourth binding portion (for example, a second binding portion in an embodiment described later) that is disposed opposite to the third binding portion and holds a stator inner diameter side portion of the transition portion held by the second transition portion holding portion. 4 tie portions 54), and
In the first to fourth binding portions, the coil abutting portion with which the coil abuts is arranged such that at least the plurality of windings constituting the bundled wire are arranged in parallel in the front-rear direction when the stator axial direction is the front-rear direction. Has a width that can be placed,
At least a part of the coil contact portion is provided with a groove portion (for example, groove portions 61, 62, 65, 66, 71, 72, 75, 76 in the embodiments described later) for separately holding the windings of the bundle wire. )
Between the groove and the first winding end of the second binding portion, and between the groove and the second winding end of the third binding portion, the plurality of windings of the bundle wire A salient pole concentrated winding stator of an electric motor, characterized in that a twisted portion (for example, a twisted portion 23 in an embodiment described later) in which the parallel direction is twisted from the stacking direction to the front-rear direction is provided.

  According to the first aspect of the present invention, since the groove portion for separating and holding the windings of the bundled wire is provided in at least a part of the coil contact portion, fretting between the plurality of windings of the transition portion is prevented. It is possible to prevent the winding from being peeled off. Further, even when the bundled wire is pulled with a strong tension, the winding is held in the groove portion, so that the winding can be prevented from sliding off from the binding portion. Furthermore, between the groove part of the 2nd binding part and the 1st winding end and between the groove part of the 3rd binding part and the 2nd winding end, the parallel direction of the several coil | winding of a bundle wire is from a lamination direction. Since the twist part twisted to the front-back direction is provided, the twist of the some winding of a bundle wire can be converged.

It is a principal part longitudinal cross-sectional view of the outer rotor type | mold electric motor by which one Embodiment of the salient pole concentrated winding stator which concerns on this invention is employ | adopted. It is a front view of the stator shown in FIG. FIG. 3 is a front view of the stator core shown in FIG. 2. It is a front view of the split core shown in FIG. It is a perspective view of an insulator. It is a front view of an insulator. It is the sectional view on the AA line in FIG. It is the BB sectional view taken on the line in FIG. It is CC sectional view taken on the line in FIG. It is the DD sectional view taken on the line in FIG. It is a front view of the split core of the 1st modification of a salient pole concentrated winding stator. It is the EE sectional view taken on the line in FIG. It is the FF sectional view taken on the line in FIG. It is a front view of the split core of the 2nd modification of a salient pole concentrated winding stator. It is the GG sectional view taken on the line in FIG. It is the HH sectional view taken on the line in FIG. It is the JJ sectional view taken on the line in FIG. It is the KK sectional view taken on the line in FIG.

  Hereinafter, an embodiment of a salient pole concentrated winding stator of an electric motor according to the present invention will be described in detail with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

  FIG. 1 is a longitudinal sectional view of an outer rotor type electric motor to which the stator of the present invention is applied. As shown in FIG. 1, the electric motor of the present embodiment is a three-phase, eight-pole outer rotor type electric motor 1, a stator 10 fixed to a motor housing 2 with bolts 3, and a slight gap on the outer peripheral side of the stator 10. And an annular rotor 4 disposed via the.

  In the rotor 4, an annular rotor yoke 6 in which a magnet 6b is embedded in a rotor core 6a formed by laminating electromagnetic steel plates is fixed to an inner peripheral surface 5a of an edge portion of a framed support member 5, and the motor housing 2 is provided. Are fixed to a rotary shaft 8 rotatably supported by ball bearings 7 and 7 fitted inside. The rotor 4 is rotationally driven by a rotating magnetic field generated in the stator 10. A resolver 9 that detects the rotational speed of the rotary shaft 8 is disposed between the base portion 5 b of the support member 5 and the stator 10.

  As shown in FIGS. 2 and 3, the stator 10 includes a stator core 11 and 24 divided cores 12 connected in an annular shape. The stator core 11 is configured by laminating a plurality of electromagnetic steel plates in the stator axial direction, and is formed to project radially from the annular support portion 11a toward the radially outer side, and has 24 teeth 11b arranged in the circumferential direction of the stator. .

  Six convex portions 11c having bolt holes 11d are formed on the inner peripheral surface of the support portion 11a of the stator core 11 at substantially equal intervals in the circumferential direction, and the stator is formed by bolts 3 inserted into the bolt holes 11d. 10 is fastened to the motor housing 2.

  As shown in FIG. 4, the split core 12 is inserted into the teeth 11 b of the stator core 11, and an insulator 13 molded from a synthetic resin having insulating properties, and two coils 15 a and 15 a are bundled on the insulator 13. And a coil 14 formed by winding the bundled wire 15. Thereby, the bundle wire 15 is wound around each tooth 11b of the stator core 11 by salient pole concentrated winding.

  As shown in FIG. 2, the coil 14 includes three U-phase coils 14 u, V-phase coils 14 v, and W-phase coils 14 w, each of which includes eight U-phase coils 14 u, V-phase coils 14 v, W-phase coil 14w is arranged in each tooth 11b of stator core 11 in this order in the circumferential direction of the stator. That is, in-phase coils 14 (for example, U-phase coil 14 u) are routed across other-phase coils 14 (for example, V-phase coil 14 v and W-phase coil 14 w), and the same bundle as in-phase coil 14. They are connected by a crossover portion 15T composed of a line 15.

  In addition, as shown in FIG. 2, each of the eight coils 14 (U phase, V phase, and W phase coils 14u, 14v, and 14w) is composed of one coil group 16 (U phase, V phase, and W). Phase coil groups 16u, 16v, and 16w), and eight coils 14 (U phase, V phase, and W phase coil groups 16u, 16v, and 16w) belonging to each coil group 16 (U phase, V phase, and W phase coil groups 16u, 16v, and 16w). And the W-phase coils 14u, 14v, 14w) are continuously wound around the same bundle wire 15 (U-phase, V-phase, and W-phase bundle wires 15u, 15v, 15w).

  One end of the U-phase bundle wire 15u of the U-phase coil group 16u is connected to the U-phase connection terminal 17u, and one end of the V-phase bundle wire 15v of the V-phase coil group 16v is connected to the V-phase connection terminal 17v. One end of the W-phase bundle wire 15w of the W-phase coil group 16w is connected to the W-phase connection terminal 17w. The other ends of the bundled wires 15u, 15v, 15w of the coil groups 16u, 16v, 16w are connected to the midpoint terminal 18.

  As shown in FIG. 4, the coil 14 is a winding portion 20 in which the bundle wire 15 is laminated while being annularly wound around the insulator 13, and a stator outer diameter side end portion of the bundle wire 15 of the winding portion 20. It has a first winding end 21 and a second winding end 22 that is an end portion on the stator inner diameter side of the bundle 15 of the winding portion 20. Further, the winding portion 20 is laminated while the stator radial direction is the lamination direction, and each winding 15a of the bundle wire 15 is wound along a trunk portion 30 of an insulator 13 described later. Moreover, the said transition part 15T connects the 1st winding end 21 of the coil 14, and the 2nd winding end 22 of the coil 14 from which an in-phase differs.

  As shown in FIGS. 4 to 8, the insulator 13 includes a body part 30 around which the bundled wire 15 is wound, and an outer peripheral side collar part 31 and an inner peripheral side collar part provided at both radial ends of the body part 30. 32, an outer partition wall 33 extending radially outward from one axial end portion of the outer peripheral flange 31, and projecting outward from the outer partition wall 33 in the axial direction, on the first winding end 21 side The first transition part holding part 41 that holds the transition part 15T and the axially one end part of the inner peripheral side collar part 32 are extended outward in the axial direction, and the transition part 15T on the second winding end 22 side is retained. And a second transition part holding part 42.

  The body portion 30 is formed in a cylindrical shape having a rectangular cross section having square holes 30a penetrating in the stator radial direction by walls 34 and 35 facing each other in the stator axial direction and walls 36 and 37 facing each other in the circumferential direction of the stator. . The size of the square hole 30a is slightly larger than the teeth 11b of the stator core 11, and the teeth 11b can be inserted therethrough. A plurality of concave grooves 38 for positioning the two windings 15a and 15a of the bundle wire 15 when the bundle wire 15 is wound are formed in the walls 36 and 37 along the stator axial direction. ing.

  The first crossover holding portion 41 has a mountain shape that guides the bundle wire 15 from the stator inner diameter side to the stator outer diameter side in the same direction as the winding direction of the coil 14 and has the apex portion P on the stator outer diameter side. A first binding portion 51 having an inclined surface 51a and holding the stator outer diameter side portion of the crossover portion 15T, the first binding portion 51 and the first binding portion 51 are arranged to face the stator in the circumferential direction. A second binding portion 52 that has an inclined surface 52a formed in parallel to the inclined surface 51a of the 51 and holds the stator inner diameter side portion of the transition portion 15T held by the first transition portion holding portion 41; A holding groove 55 is formed between the surfaces 51a and 52a and holds the two windings 15a and 15a of the bundle wire 15 in parallel in the stator axial direction. Further, the first binding portion 51 and the second binding portion 52 have a width that allows the two windings 15a and 15a of the bundle wire 15 to be arranged in parallel in the front-rear direction when the stator axial direction is the front-rear direction. Have.

  The second transition part holding part 42 has an inclined surface 53a that guides the bundle wire 15 from the stator inner diameter side to the stator outer diameter side in the same direction as the winding direction of the coil 14, and holds the transition part 15T. The binding portion 53, the third binding portion 53 and the inclined surface 54a that is arranged in parallel with the inclined surface 53a of the third binding portion 53, are arranged opposite to the stator in the circumferential direction. The connecting portion 15T held by the holding portion 42 is formed between the fourth binding portion 54 that holds the stator inner diameter side portion and the inclined surfaces 53a and 54a, and the two windings 15a and 15a of the bundle wire 15 are connected to each other. And holding grooves 56 that are held in parallel in the stator axial direction. Moreover, the 3rd binding part 53 and the 4th binding part 54 have the width | variety in which the two windings 15a and 15a of the bundle wire 15 can be paralleled in a stator axial direction.

  4 and 9, two windings 15a and 15a of the transition portion 15T held by the first transition portion holding portion 41 are provided at the radially outer end portion of the first binding portion 51. Are formed in the stator axial direction. The groove portion 61 is formed between the outer partition wall 33 of the insulator 13 and the intermediate wall 63 erected at the axially intermediate portion of the radially outer end portion of the first binding portion 51, and the groove portion 62 is formed between the intermediate wall 63 and the end wall 64 standing at the axially outer end of the radially outer end of the first binding portion 51.

  As shown in FIGS. 4 and 10, the two windings 15 a and 15 a of the transition portion 15 </ b> T held by the second transition portion holding portion 42 are disposed at the radially inner end portion of the fourth binding portion 54. Are formed in the stator 65 in the direction of the stator shaft. The groove portion 65 is formed between a part of the inner peripheral side flange portion 32 of the insulator 13 and an intermediate wall 67 erected at the axially intermediate portion of the radial inner end portion of the fourth binding portion 54. The groove portion 66 is formed between the intermediate wall 67 and the end wall 68 erected at the axially outer end portion of the radially inner end portion of the fourth binding portion 54.

  Further, as shown in FIG. 4, between the second binding portion 52 and the first winding end 21 of the coil 14 and between the third binding portion 53 and the second winding end 22 of the coil 14, A twist portion 23 is provided in which the parallel winding direction of the two windings 15a, 15a of the bundle wire 15 is twisted from the stacking direction to the front-rear direction.

  As described above, according to the stator 10 of the present embodiment, the two windings 15a and 15a of the transition portion 15T held by the first transition portion holding portion 41 are connected to the first binding portion 51 by the stator shaft. Groove portions 61 and 62 that are separated and held in the direction are formed, and the two windings 15a and 15a of the transition portion 15T held by the second transition portion holding portion 42 are formed on the fourth binding portion 54 in the stator. Since the groove portions 65 and 66 that are separated and held in the axial direction are formed, fretting between the two windings 15a and 15a of the transition portion 15T can be prevented, and the coating of the winding 15a can be peeled off. Can be prevented. Even when the bundled wire 15 is pulled with a strong tension, the winding 15a is held in the grooves 61, 62, 65, 66, so that the winding 15a slides down from the tangled portions 51, 54. Can be prevented.

  Further, according to the stator 10 of the present embodiment, the bundle wire 15 is between the second binding portion 52 and the first winding end 21 and between the third binding portion 53 and the second winding end 22. Since the twisted portion 23 in which the parallel direction of the two windings 15a and 15a is twisted from the stacking direction to the front-rear direction is provided, the twisting of the two windings 15a and 15a of the bundle 15 can be converged.

  As a first modification of the present embodiment, the end walls 64 and 68 of the first binding portion 51 and the fourth binding portion 54 may be deleted as shown in FIGS. According to this modified example, the mold for molding the insulator 13 can be simplified, and the resin material can be reduced, so that the manufacturing cost can be reduced.

  Further, as a second modification of the present embodiment, as shown in FIGS. 14 to 16, the second binding portion 52 is also held by the first transition portion holding portion 41 as in the case of the first binding portion 51. Grooves 71 and 72 for separating and holding the two windings 15a and 15a of the transition portion 15T in the stator axial direction may be formed. The groove 71 is formed between the outer partition wall 33 of the insulator 13 and the intermediate wall 73 erected at the intermediate portion in the axial direction of the second binding portion 52, and the groove 72 is connected to the intermediate wall 73 and the second binding. It is formed between the end wall 74 erected at the axially outer end portion of the portion 52.

  As shown in FIGS. 14, 17, and 18, similarly to the fourth binding portion 54, the third binding portion 53 also has the connecting portion 15 </ b> T held by the second connecting portion holding portion 42. Grooves 75 and 76 for separating and holding the two windings 15a and 15a in the stator axial direction may be formed. The groove portion 75 is formed between a part of the inner peripheral side flange portion 32 of the insulator 13 and the intermediate wall 77 standing at the axially intermediate portion of the third binding portion 53, and the groove portion 76 is It is formed between the wall 77 and the end wall 78 erected at the axially outer end of the third binding portion 53.

  According to this modification, the two windings 15a and 15a of the transition portion 15T held by the first transition portion holding portion 41 are arranged in the stator axial direction on the first binding portion 51 and the second binding portion 52. The groove portions 61 and 62 and the groove portions 71 and 72 to be held separately are formed, respectively, and the crossover portion 15T held by the second crossover portion holding portion 42 in the third binding portion 53 and the fourth binding portion 54. The groove portions 65 and 66 and the groove portions 75 and 76 for separating and holding the two windings 15a and 15a in the stator axial direction are formed, respectively. Therefore, the flute between the two windings 15a and 15a of the transition portion 15T is formed. Tinging can be further prevented, and the winding 15a can be further prevented from being peeled off.

In addition, this invention is not limited to what was illustrated to the said embodiment, In the range which does not deviate from the summary of this invention, it can change suitably.
For example, in the said embodiment, the groove part which isolate | separates and hold | maintains two windings of a bundle wire is formed in the 1st binding part and the 4th binding part, or the 1st-4th binding part. However, a groove part may be formed only in the 2nd binding part and the 4th binding part.

1 Outer rotor type electric motor 10 Stator (salient pole concentrated winding stator)
DESCRIPTION OF SYMBOLS 11 Stator core 12 Divided core 13 Insulator 14 Coil 15 Bundled wire 15a Winding 15T Transition part 20 Winding part 21 First winding end 22 Second winding end 23 Twist part 30 Body part 41 First transition part holding part 42 Second transition part Holding portion 51 First binding portion 51a Inclined surface 52 Second binding portion 53 Third binding portion 53a Inclined surface 54 Fourth binding portion 61 Groove portion 62 Groove portion 65 Groove portion 66 Groove portion 71 Groove portion 72 Groove portion 75 Groove portion 76 Groove portion P vertex Part

Claims (1)

A stator core;
A bundled wire in which at least two or more windings are bundled;
A winding portion that is formed by winding the bundle wire and is stacked while the bundle wire is wound in an annular shape, and a first winding that is an end portion on the stator outer diameter side of the bundle wire of the winding portion A coil having an end and a second winding end that is a stator inner diameter side end of the bundled wire of the winding portion;
A split core formed using an insulator that holds the coil is a salient pole concentrated winding stator of an electric motor that is connected in a plurality of rings,
A crossover connecting the first winding end of the coil and the second winding end of the different coil;
The winding part has a stator radial direction as a lamination direction, and the windings constituting the bundle wire are laminated while being wound along a body part of the insulator,
The insulator is
A first transition part holding part that holds the transition part on the first winding end side;
A second transition part holding part that holds the transition part on the second winding end side,
The first crossover holding section is
In the same direction as the winding direction of the coil, it has a mountain-shaped inclined surface that is guided from the stator inner diameter side to the stator outer diameter side and has a vertex on the stator outer diameter side. A first binding portion that holds the side portion;
A second binding portion that is disposed opposite to the first binding portion and holds the stator inner diameter side portion of the transition portion held by the first transition portion holding portion;
The second crossover holding section is
A third binding portion that has an inclined surface that leads from the stator inner diameter side to the stator outer diameter side in the same direction as the winding direction of the coil, and holds the transition portion;
A fourth binding portion that is disposed opposite to the third binding portion and that holds the stator inner diameter side portion of the transition portion held by the second transition portion holding portion;
In the first to fourth binding portions, the coil abutting portion with which the coil abuts is arranged such that at least the plurality of windings constituting the bundled wire are arranged in parallel in the front-rear direction when the stator axial direction is the front-rear direction. Has a width that can be placed,
At least a part of the coil contact portion is provided with a groove portion that separates and holds the windings of the bundle wire,
Between the groove and the first winding end of the second binding portion, and between the groove and the second winding end of the third binding portion, the plurality of windings of the bundle wire A salient pole concentrated winding stator of an electric motor, characterized in that a twisted portion in which a parallel direction is twisted from the stacking direction to the front-rear direction is provided.

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