JP6996407B2 - Stator coil and stator equipped with it - Google Patents

Description

The present invention relates to a stator coil and a stator.

In Patent Document 1, a first portion in which the coil end of a stator coil having a flat cross section is inclined in the circumferential direction while extending axially from the outer layer of a pair of slots separated by a predetermined pitch, and a pair of slots. A second portion that extends axially from the other inner layer of the coil and tilts in the circumferential direction, and an axial end of the first and second portions that extends radially and is located at the axial end of the coil end. A vehicle alternator composed of a third portion coupled to a portion is disclosed.

In this vehicle alternator, the first part and the third part of the coil end, and the connecting part between the second part and the third part are axially and radially so as to avoid interference between the coil ends. A relief part is provided so that it can bend.

Japanese Unexamined Patent Publication No. 2001-231203

However, in the stator coil of the vehicle alternator described in Patent Document 1, the connecting portion between the first portion and the third portion of each coil end protrudes outward in the radial direction from the first portion. , The third portion protrudes inward in the radial direction from the second portion.

Therefore, in the AC generator for vehicles described in Patent Document 1, the radial width occupied by the coil ends of the stator coils of the second layer and the third layer becomes large, so that the diameter of the stator becomes large. As a result, the diameter of the alternator for vehicles becomes large.

The present invention has been made in view of the above circumstances, and the radial length of the gap provided between the outer coil end layer and the inner coil end layer can be shortened, and the radial length of the stator slot can be shortened. It is an object of the present invention to provide a stator coil and a stator which can shorten the size of the stator and reduce the diameter of the stator.

The present invention is a stator coil composed of a plurality of segment coils provided in a stator in which a plurality of slots are formed in order to achieve the above object, and the segment coils are different slots. Each has a pair of slot accommodating portions and a coil end that connects the pair of slot accommodating portions and projects axially from the pair of slot accommodating portions. It has an inner slot accommodating portion arranged on the radial inner side of the slot and an outer slot accommodating portion arranged on the radial outer side of the slot with respect to the inner slot accommodating portion. The coil end is an inner coil piece that connects a top portion provided at an axial end portion, the top portion and the inner slot accommodating portion, and an outer coil piece that connects the top portion and the outer slot accommodating portion. And, a plurality of the coil ends are arranged so as to be aligned in the circumferential direction to form a coil end layer, and in the coil end layer, the inner coil pieces of the coil ends adjacent to the circumferential direction are said to each other. The outer coil pieces of the coil ends adjacent to each other in the circumferential direction are arranged so as to overlap each other in the axial direction, and two coil end layers are arranged side by side in the radial direction. A set of coil end pairs is formed, the coil end pair is provided at least one pair in the radial direction, and the pair of coil end pairs is arranged on the outer side in the radial direction, and the coil end is provided. An outer coil end layer having a first projecting portion whose top protrudes outward in the radial direction, and an outer coil end layer having a first protrusion in the radial direction, and the top portion of the coil end is arranged inward in the radial direction. It is composed of an inner coil end layer having a second protruding portion protruding to the side.

According to the present invention, the radial length of the gap provided between the outer coil end layer and the inner coil end layer can be shortened, the radial dimension of the stator slot can be shortened, and the diameter of the stator can be reduced. It is possible to provide a stator coil and a stator that can be made smaller.

FIG. 1 is a plan view of a stator according to an embodiment of the present invention as viewed from one side in the axial direction. FIG. 2 is a cross-sectional view of a stator according to an embodiment of the present invention cut in a direction orthogonal to the axial direction. FIG. 3 is a wiring diagram of a stator coil according to an embodiment of the present invention. FIG. 4 is a diagram showing the arrangement of the stator coil according to the embodiment of the present invention in the slot. FIG. 5 is a perspective view of a stator according to an embodiment of the present invention. FIG. 6 is a perspective view showing a U-phase segment coil of the stator coil according to the embodiment of the present invention. FIG. 7 is a plan view showing the arrangement of the segment coil of the stator coil according to the embodiment of the present invention. 8A and 8B are views showing segment coils arranged on the outer side in the radial direction of the stator coil according to the embodiment of the present invention, in which FIG. 8A is a plan view and FIG. 8B is a side view. .. 9A and 9B are views showing segment coils arranged on the inner side in the radial direction of the stator coil according to the embodiment of the present invention, where FIG. 9A is a plan view and FIG. 9B is a side view. .. FIG. 10 is a side view of the coil end of the stator coil according to the embodiment of the present invention. FIG. 11 is a side view of the stator according to an embodiment of the present invention.

The stator coil according to the embodiment of the present invention is a stator coil composed of a plurality of segment coils provided in a stator in which a plurality of slots are formed and arranged in the slots, and the segment coils are different. It has a pair of slot accommodating portions, each of which is accommodated in a slot, and a coil end that connects the pair of slot accommodating portions and projects axially from the pair of slot accommodating portions. It has an inner slot accommodating portion arranged on the inner side in the radial direction of the coil and an outer slot accommodating portion arranged on the outer side in the radial direction of the slot from the inner slot accommodating portion, and the coil end is a shaft. It has a top provided at the end in the direction, an inner coil piece connecting the top and the inner slot housing, and an outer coil piece connecting the top and the outer slot housing, with a plurality of coil ends. The coil end layers are arranged so as to be aligned in the circumferential direction to form a coil end layer. The outer coil pieces of the coil ends are arranged so as to overlap each other in the axial direction, and two coil end layers are arranged in the radial direction to form a set of coil end pairs, and at least one pair of coil end pairs is provided in the radial direction. A set of coil end pairs is arranged radially outwardly with an outer coil end layer having a first protruding portion where the top of the coil end projects radially outwardly. It is composed of an inner coil end layer, which is arranged on the inner side of the coil end and has a second protruding portion in which the top of the coil end projects inward in the radial direction.

Thereby, in the stator coil according to the embodiment of the present invention, the radial length of the gap provided between the outer coil end layer and the inner coil end layer can be shortened, and the radial direction of the stator slot can be shortened. The size of the stator can be shortened and the diameter of the stator can be reduced.

Hereinafter, the stator coil and the stator according to the embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the stator 1 according to an embodiment of the present invention is formed in a cylindrical shape and includes a stator coil 10. On the radial inner side of the stator 1, a rotor (not shown) that can rotate relative to the stator 1 is arranged via a predetermined gap. A permanent magnet (not shown) is embedded inside the rotor.

The stator 1 generates a rotating magnetic field that rotates in the circumferential direction by supplying a three-phase alternating current to the stator coil 10. When a rotating magnetic field is generated in the stator 1, this rotating magnetic field acts on the permanent magnets of the rotor to generate torque. In this way, the stator 1 can rotationally drive the rotor by interlinking the generated magnetic flux with the rotor.

The "radial direction" is a direction orthogonal to the direction in which the rotation axis of the rotor extends, and is indicated in the radial direction about the rotation axis of the rotor. The "outer side in the radial direction" is the side far from the rotation axis of the rotor in the radial direction, and the "inner side in the radial direction" is the side closer to the rotation axis of the rotor in the radial direction. That is. Further, the "circumferential direction" indicates a circumferential direction about the rotation axis of the rotor. Further, the "axial direction" indicates a direction in which the rotation axis of the rotor extends.

The stator 1 is formed of a magnetic member having a high magnetic permeability, and is fixed to a motor case (not shown) via a connecting piece (not shown) made of a non-magnetic material in a state of being magnetically shielded. As a result, for example, the generation of leakage flux is suppressed.

As shown in FIG. 2, the stator 1 includes an annular stator core 2 and a plurality of teeth 3 formed at predetermined intervals in the circumferential direction of the stator core 2. The teeth 3 project inward in the radial direction from the stator core 2.

Slots 4, which are groove-shaped spaces, are formed between the teeth 3 adjacent to each other in the circumferential direction. The stator coil 10 corresponding to the U-phase, V-phase, and W-phase of three-phase alternating current is accommodated in the slot 4.

The stator coil 10 is composed of a plurality of segment coils 11. The stator coil 10 is wound around the teeth 3 by distributed winding. The stator coil 10 generates magnetic flux by energization. In this embodiment, 48 slots 4 are formed at equal intervals in the circumferential direction.

In this embodiment, six segment coils 11 are inserted in one slot 4. Each segment coil 11 is arranged in the separated slots 4 so as to straddle the five teeth 3 in the circumferential direction. An insulating paper (not shown) is provided between the segment coil 11 and the slot 4.

As shown in FIG. 3, the stator coil 10 of this embodiment adopts a star connection and is composed of a U-phase winding, a W-phase winding, and a V-phase winding. For the U-phase winding, the W-phase winding, and the V-phase winding, two winding groups consisting of eight windings connected in series are connected in parallel. The eight windings in each winding group make up one winding pair with two windings.

The U-phase winding is the first winding group U1 in which the winding U11a, the winding U12a, the winding U12b, the winding U13a, the winding U13b, the winding U14a, the winding U14b and the winding U11b are connected in series. , Winding U21a, Winding U21b, Winding U22a, Winding U22b, Winding U23a, Winding U23b, Winding U24a and Winding U24b are connected in parallel to a second winding group U2. ing.

The V-phase winding is the first winding group V1 in which the winding V11a, the winding V12a, the winding V12b, the winding V13a, the winding V13b, the winding V14a, the winding V14b and the winding V11b are connected in series. , Winding V21a, Winding V21b, Winding V22a, Winding V22b, Winding V23a, Winding V23b, Winding V24a and Winding V24b are connected in series to the second winding group V2. ing.

The W-phase winding is the first winding group W1 in which the winding W11a, the winding W12a, the winding W12b, the winding W13a, the winding W13b, the winding W14a, the winding W14b and the winding W11b are connected in series. , Winding W21a, Winding W21b, Winding W22a, Winding W22b, Winding W23a, Winding W23b, Winding W24a and Winding W24b are connected in series to a second winding group W2. ing.

FIG. 3 is a wiring diagram of the stator coil 10 of this embodiment, and shows the wiring method and the electrical phase relationship of each phase winding. As shown in FIG. 3, the W phase and the V phase have substantially the same configuration as the U phase, and are arranged so that the phases of the voltages induced in each are shifted by 120 degrees with respect to the electric angle.

FIG. 4 is a diagram showing the arrangement of the stator coil 10 in the slot 4 according to the wiring diagram shown in FIG. In FIG. 4, the arrangement of the U phase, the V phase, and the W phase is shown in order from the top of the figure, but in reality, these phase windings are overlapped and accommodated in the slot 4.

In each phase winding, the windings arranged adjacent to each other in the circumferential direction form a winding pair in pairs. For example, as shown in FIG. 4, in the first winding group U1 of the U-phase winding, the winding U11a and the winding U11b, the winding U12a and the winding U12b, the winding U13a and the winding U13b, and the winding U14a And the winding U14b form a winding pair, respectively.

Further, in the second winding group U2 of the U-phase winding, the winding U21a and the winding U21b, the winding U22a and the winding U22b, the winding U23a and the winding U23b, and the winding U24a and the winding U24b are wound respectively. It constitutes a line pair. The two windings constituting these winding pairs are wound in different winding directions from each other.

The winding U11a constituting one winding pair and the winding U12a constituting the other winding pair are wound with one slot open. The winding U21a and the winding U21b constituting the winding pair are wound so as to share the slot 4 between the winding U11a and the winding U12a.

The winding U11a and the winding U21a are wound in the same direction. The winding U12a and the winding U21b of the winding vs. U21 are wound in the same direction.

The winding U22a is wound around the winding U21b with one slot open. The winding U12a and the winding U12b are wound so as to share the slot 4 between the winding U21b and the winding U22a.

The winding U12a and the winding U12b are wound in opposite directions. The winding U21b and the winding U22a are wound in opposite directions. The winding U12b and the winding U22a are wound in the same direction. The winding U13a and the winding U22b are wound in the same direction. Other winding pairs are wound in the same way.

In this way, the winding of the first winding group U1 is wound so as to be accommodated in a slot 4 different from the winding of the second winding group U2 having the same phase.

The first winding group V1 and the second winding group V2 of the V phase are shifted by four slots from the first winding group U1 and the second winding group U2 of the U phase, and the first winding is It is wound in the same manner as the group U1 and the second winding group U2.

The first winding group W1 and the second winding group W2 of the W phase are shifted by four slots from the first winding group V1 and the second winding group V2 of the V phase, and the first winding is It is wound in the same manner as the group U1 and the second winding group U2.

Next, the configuration of the stator coil 10 according to the present embodiment will be described with reference to FIGS. 5 to 11.

As shown in FIG. 5, the stator coil 10 has a plurality of segment coils 11. Each segment coil 11 constitutes each winding described above. Therefore, a plurality of segment coils 11 are made into one set, and the one set of segment coils 11 constitutes each of the U-phase winding, the V-phase winding, and the W-phase winding. That is, a plurality of sets of segment coils 11 are provided for a plurality of phases, and in this embodiment, three phases corresponding to the U phase, the V phase, and the W phase.

The segment coil 11 is composed of an edgewise bent flat wire having a rectangular cross section. "Edgewise bending" means bending a flat wire in a direction that makes it difficult to bend, that is, bending the flat wire around the short side of the cross section of the flat wire.

FIG. 6 shows a U-phase segment coil 11 housed in the slot 4 of the stator 1, and is a part of the stator core 2 in the axial direction so that the housed portion of each U-phase segment coil 11 can be visually recognized. Is omitted.

As shown in FIG. 6, the segment coil 11 includes a pair of slot accommodating portions 12 and a coil end 13.

The pair of slot accommodating portions 12 are portions accommodating in different slots 4. The coil end 13 is a portion that connects the pair of slot accommodating portions 12 to each other and projects axially from the pair of slot accommodating portions 12. The coil end 13 is bent in a U shape by edgewise bending, and is exposed to the outside of the slot 4 from one end surface 2a in the axial direction of the stator core 2.

As shown in FIG. 7, the segment coils 11 are arranged so as to overlap each other in the circumferential direction, and are arranged side by side in two rows in the radial direction. Hereinafter, the segment coil 11 arranged on the outer side in the radial direction is referred to as a segment coil 11A, and the segment coil 11 arranged on the inner side in the radial direction is referred to as a segment coil 11B.

Further, in the following, the segment coil 11A and the segment coil 11B are not distinguished, and when the term is simply referred to as the segment coil 11, both the segment coil 11A and the segment coil 11B are included.

The segment coil 11A and the segment coil 11B are provided for three phases corresponding to the U phase, the V phase, and the W phase, respectively. The currents of each of the U phase, the V phase, and the W phase flow in parallel to the segment coil 11A and the segment coil 11B.

8 (a) and 8 (b) show the segment coil 11A, and FIGS. 9 (a) and 9 (b) show the segment coil 11B. As shown in FIGS. 8 and 9, the shape of the coil end 13 is different between the segment coil 11A and the segment coil 11B. Hereinafter, the coil end of the segment coil 11A is referred to as a coil end 13A, and the coil end of the segment coil 11B is referred to as a coil end 13B.

Further, in the following, the coil end 13A and the coil end 13B are not distinguished, and the term coil end 13 simply includes both the coil end 13A and the coil end 13B.

As shown in FIGS. 8 and 9, the pair of slot accommodating portions 12 of the segment coil 11 have an inner slot accommodating portion 12a arranged on the radial inward side of the slot 4 (see FIG. 7) and an inner slot accommodating portion 12a. It has an outer slot accommodating portion 12b arranged on the radial outer side of the slot 4 with respect to the portion 12a.

In FIGS. 8A and 9A, the lower side shows the inner side in the radial direction and the upper side shows the outer side in the radial direction in the figure. In FIGS. 8 (b) and 9 (b), the front side with respect to the paper surface indicates the inner side in the radial direction, and the back side with respect to the paper surface indicates the outer side in the radial direction.

As shown in FIGS. 8 (a) and 8 (b), the coil end 13A has a top portion 30, an inner coil piece 31, and an outer coil piece 32. The top 30 is provided at the end in the axial direction. The axial end of the coil end 13A means the vicinity of the apex including the apex of the coil end 13A protruding in the axial direction.

The inner coil piece 31 connects the top portion 30 and the inner slot accommodating portion 12a. The outer coil piece 32 connects the top portion 30 and the outer slot accommodating portion 12b.

As shown in FIGS. 9A and 9B, the coil end 13B has a top 40, an inner coil piece 41, and an outer coil piece 42. The top 40 is provided at the end in the axial direction. The axial end of the coil end 13B means the vicinity of the apex including the apex of the coil end 13B protruding in the axial direction.

The inner coil piece 41 connects the top portion 40 and the inner slot accommodating portion 12a. The outer coil piece 42 connects the top portion 40 and the outer slot accommodating portion 12b.

As shown in FIG. 7, the plurality of coil ends 13A are arranged so as to be aligned in the circumferential direction to form the coil end layer 50A. Further, the plurality of coil ends 13B are arranged so as to be aligned in the circumferential direction to form the coil end layer 50B.

As shown in FIGS. 7 and 10, the coil end layer 50A is arranged such that the inner coil pieces 31 of the coil ends 13A adjacent to each other in the circumferential direction overlap each other in the axial direction, and the coil ends 13A adjacent to each other in the circumferential direction. The outer coil pieces 32 are arranged so as to overlap each other in the axial direction.

The coil end layer 50B is arranged so that the inner coil pieces 41 of the coil ends 13B adjacent in the circumferential direction overlap each other in the axial direction, and the outer coil pieces 42 of the coil ends 13B adjacent in the circumferential direction overlap in the axial direction. It is arranged like this.

As shown in FIG. 7, the coil end layers 50A and the coil end layers 50B arranged side by side in the radial direction form a pair of coil end pairs 60. That is, in the stator coil 10 of this embodiment, two coil end layers are arranged in the radial direction to form a set of coil end pairs 60.

The coil end layer 50A is arranged on the outer side in the radial direction with respect to the coil end layer 50B. The coil end layer 50B is arranged on the inner side in the radial direction with respect to the coil end layer 50A. The coil end layer 50A of this embodiment constitutes the outer coil end layer in the present invention. The coil end layer 50B of this embodiment constitutes the inner coil end layer in the present invention.

The stator coil 10 of this embodiment has a configuration in which one set of coil end pairs 60 is provided in the radial direction, but a configuration in which a plurality of sets of coil end pairs 60 are provided in the radial direction may be provided. As a method of increasing the number of coil end pairs 60, for example, by adding one coil end layer to each of the inner side and the outer side in the radial direction with respect to the coil end pair 60 of this embodiment, the second set The first method of forming the above coil end pairs and the second method of arranging the coil end pairs on the inner side or the outer side in the radial direction with respect to the coil end pair 60 of this embodiment are be.

In both the first method and the second method, an even number of coil end layers is formed. Therefore, if two coil end layers adjacent to each other in the radial direction are used as a set of coil end pairs, the present invention is used. Is applicable.

The coil end pair 60 has a first projecting portion 61 projecting outward in the radial direction and a second projecting portion 62 projecting inward in the radial direction. The first protruding portion 61 and the second protruding portion 62 project toward opposite sides in the radial direction.

As shown in FIG. 8A, the first protruding portion 61 is provided on the top portion 30 of the coil end 13A provided on the outer side in the radial direction. The first protruding portion 61 is formed so that the top portion 30 of the coil end 13A protrudes outward in the radial direction by flatwise bending. Flatwise bending means bending a flat wire in a direction in which it is easy to bend, that is, bending the long side of the cross section of the flat wire as an axis.

The top portion 30 of the coil end 13A has a first bent portion 71 and a second bent portion 72. The first bent portion 71 is bent outward from the inner coil piece 31 in the radial direction and is connected to one end 61a in the circumferential direction of the first protruding portion 61. The second bent portion 72 is bent outward from the outer coil piece 32 in the radial direction and is connected to the other end 61b in the circumferential direction of the first protruding portion 61.

As shown in FIG. 9A, the second protruding portion 62 is provided on the top 40 of the coil end 13B provided on the inner side in the radial direction. The second protruding portion 62 is formed so that the top portion 40 of the coil end 13B protrudes inward in the radial direction by flatwise bending.

The top 40 of the coil end 13B has a third bent portion 73 and a fourth bent portion 74. The third bent portion 73 bends inward in the radial direction from the inner coil piece 41 and is connected to one end 62a in the circumferential direction of the second protruding portion 62. The fourth bent portion 74 bends inward in the radial direction from the outer coil piece 42 and is connected to the other end 62b in the circumferential direction of the second protruding portion 62.

In the stator coil 10 of this embodiment, the coil end 13A constituting the coil end layer 50A and the coil end 13B constituting the coil end layer 50B are set to dimensions that satisfy the following relationships, respectively.

As shown in FIG. 8A, in the coil end 13A, the diameter between the radial inner end surface 31a of the inner coil piece 31 and the radial inner end surface 61c of the first protruding portion 61. The dimension in the direction is D1, and the dimension in the radial direction of the inner coil piece 31 is W1.

As shown in FIG. 9A, in the coil end 13B, the diameter between the radial outer end surface 42a of the outer coil piece 42 and the radial outer end surface 62c of the second protruding portion 62. The dimension in the direction is D2, and the dimension in the radial direction of the outer coil piece 42 is W2.

In the stator coil 10 of this embodiment, when the above-mentioned dimensions are D1, W1, D2, and W2, respectively, the coil end 13A and the coil end 13B satisfy the relationship of "D1> W1 and D2> W2". The dimensions are set.

As a result, in the stator coil 10 of this embodiment, as described later, a first gap G1 and a second gap G2 are formed in the coil end layer 50A and the coil end layer 50B, respectively.

Therefore, in the coil end layer 50A, the radial inner end surface 61c of the first protruding portion 61 of one coil end 13A adjacent to the circumferential direction and the inner coil piece 31 of the other coil end 13A are radially in the coil end layer 50A. It becomes easy to avoid contact with the end surface 31b on the outer side of the.

In the coil end layer 50B, the radial outer end surface 62c of the second protruding portion 62 of one coil end 13B adjacent in the circumferential direction and the radial inner side of the outer coil piece 42 of the other coil end 13B. It becomes easy to avoid contact with the end surface 42b on the side.

As shown in FIG. 7, in the coil end layer 50A, between the first protruding portion 61 of one coil end 13A of the coil ends 13A adjacent in the circumferential direction and the inner coil piece 31 of the other coil end 13A. Is formed with a first gap G1.

In the coil end layer 50B, there is a second gap G2 between the second protrusion 62 of one coil end 13B of the coil ends 13B adjacent in the circumferential direction and the outer coil piece 42 of the other coil end 13B. Is formed.

The first gap G1 and the second gap G2 are arranged so as to overlap each other in the axial direction with respect to the slot 4. Therefore, in the stator coil 10 of this embodiment, the following effects can be obtained in the insulating step of applying the varnish after arranging each segment coil 11 in the stator core 2. In the above-mentioned insulation step, varnish is applied to each segment coil 11 from above the coil end 13 with the stator core 2 standing vertically so that the coil end 13 faces upward.

In the stator coil 10 of the present embodiment, when the varnish adhering to the top 30 and the top 40 of the coil end 13 is dropped in the insulation step, the dropped varnish drops the varnish on the axial end surface 2a of the stator core 2 and the shaft of the teeth 3. It is easy to enter the slot 4 instead of the end face 3a in the direction.

Therefore, in the stator coil 10 of the present embodiment, varnish is dropped and fixed on the end surface 2a of the stator core 2 and the end surface 3a of the teeth 3, and the immobilized varnish obstructs the flow of cooling air to the coil end 13. It can be prevented.

Next, the connection portion 80 of the stator coil 10 of this embodiment will be described with reference to FIGS. 1, 5, 6 and 11.

As shown in FIG. 5, the stator coil 10 is a plurality of connection-side coil ends 15 having the same phase among the segment coils 11 constituting the U-phase windings, the V-phase windings, and the W-phase windings. It has a connection portion 80 for connecting the two.

As shown in FIGS. 5 and 6, the connection side coil end 15 is exposed to the outside of the slot 4 from the other end surface 2b in the axial direction of the stator core 2. The connection side coil end 15 is a coil end provided on the opposite side in the axial direction with respect to the coil end 13.

The connection portion 80 includes an outer connection portion 80A provided on the outer side in the radial direction and an inner connection portion 80B provided on the inner side in the radial direction. The connection portion 80 includes a pair of connection slot accommodating portions 82, a connection first coil end 83, and a connection second coil end 84.

The pair of wiring slot accommodating portions 82 are accommodated in different slots 4. The connection first coil end 83 connects the pair of connection slot accommodating portions 82 to each other, and projects axially from the pair of connection slot accommodating portions 82.

As shown in FIG. 1, each connection first coil end 83 is arranged so that adjacent connection first coil ends 83 partially overlap each other in the circumferential direction. Further, as shown in FIG. 11, the first coil end 83 for each connection is exposed to the outside of the slot 4 (see FIG. 6) from one end surface 2a in the axial direction of the stator core 2 in the axial direction. The two first coil ends 83 for wiring are arranged so as to overlap each other. The connection first coil end 83 of the present embodiment constitutes the connection coil end in the present invention.

As shown in FIG. 6, the second coil end 84 for connection is exposed to the outside of the slot 4 from the other end surface 2b in the axial direction of the stator core 2. The connection second coil end 84 is a coil end provided on the opposite side in the axial direction with respect to the connection first coil end 83.

Here, as shown in FIG. 10, when the segment coil 11 is arranged in the slot 4 of the stator 1, the height of the coil end 13 protruding in the axial direction from one end surface 2a in the axial direction of the stator core 2 The height is set to H1.

As shown in FIG. 11, when the segment coil 11 is arranged in the slot 4 of the stator 1, the first coil end 83 for connection that protrudes axially from one end surface 2a in the axial direction of the stator core 2 The height is different for the first coil end 83 for connection that overlaps in the axial direction. The height of the connection first coil end 83 on the side closer to the end surface 2a of the connection first coil ends 83 overlapping in the axial direction is set to H2, and the height of the connection first coil end 83 on the side far from the end surface 2a. The wiring is set to H3.

In this embodiment, the dimensions of the first coil end 83 for connection and the coil end 13 are set so that the heights H2 and H3 of the first coil end 83 for connection are equal to or less than the height H1 of the coil end 13. There is. In this embodiment, the height H3 of the first coil end 83 for wiring on the side far from the end surface 2a is the same as the height H1 of the coil end 13.

As a result, since the first coil end 83 for wiring does not protrude in the axial direction from the coil end 13, the axial dimension of the stator coil 10 can be shortened, and the axial length of the stator 1 can be shortened. can.

As shown in FIGS. 6 and 11, the first coil end 83 for wiring has a bent portion 83a formed by flatwise bending. The connection first coil end 83 is offset radially outward with respect to the connection slot accommodating portion 82 by the bending portion 83a. Therefore, the stator 1 of the present embodiment has a radial direction capable of accommodating the connection slot accommodating portion 82 located on the inner side in the radial direction with respect to the first coil end 83 for connection located on the outer side in the radial direction. It suffices if the slot 4 is formed up to the position of. Therefore, in the stator 1 of the present embodiment, it is not necessary to form the slot 4 in the radial direction in accordance with the radial position of the first coil end 83 for connection, and the radial length of the slot 4 is reduced. be able to. As a result, the diameter of the stator 1 becomes smaller.

In the stator 1 of the present embodiment, the height from the end surface 2a of the stator core 2 to the bent portion 83a is from the end surface 2a to the first protruding portion 61 of the coil end 13A provided on the outer side in the radial direction. It is preferable that the bent portion 83a is formed at a position lower than the height. In this case, the first protruding portion 61 of the coil end 13A and the bent portion 83a of the first coil end 83 for connection can be arranged so as to be overlapped in the axial direction. Therefore, in the stator 1 of the present embodiment, the slot accommodating portion 12 of the segment coil 11A arranged on the outer side in the radial direction and the connecting slot accommodating portion 82 of the connecting portion 80 can be arranged close to each other in the radial direction. Therefore, the radial length of the slot 4 can be reduced. As a result, the diameter of the stator 1 becomes smaller.

As described above, in the stator coil according to the present embodiment, the top portion 30 of the coil end 13A provided on the outer side in the radial direction is provided with the first protruding portion 61 protruding outward on the radial direction. A second protruding portion 62 that projects inward in the radial direction is provided on the top 40 of the coil end 13B provided on the inner side in the radial direction.

As described above, in the stator coil according to the present embodiment, since the first protruding portion 61 and the second protruding portion 62 project toward the opposite sides in the radial direction, the coil end layers arranged side by side in the radial direction. The 50A and the coil end layer 50B can be arranged close to each other.

Therefore, in the stator coil according to the present embodiment, the gap between the inner coil piece 31 of the coil end 13A constituting the coil end layer 50A and the inner coil piece 41 of the coil end 13B constituting the coil end layer 50B. Can be made smaller. Further, in the stator coil according to the present embodiment, the gap between the outer coil piece 32 of the coil end 13A and the outer coil piece 42 of the coil end 13B can be reduced.

As a result, in the stator coil according to the present embodiment, the radial dimension of the slot 4 of the stator 1 can be shortened, and the diameter of the stator 1 can be reduced.

Further, in the stator coil according to the present embodiment, since the first protruding portion 61 is provided on the top 30 of the coil end 13A, when a plurality of coil ends 13A are arranged side by side in the circumferential direction, they are adjacent to each other in the circumferential direction. A first gap G1 can be formed between the first protruding portion 61 of one coil end 13A and the inner coil piece 31 of the other coil end 13A.

Further, in the stator coil according to the present embodiment, since the second protruding portion 62 is provided on the top 40 of the coil end 13B, when a plurality of coil ends 13B are arranged side by side in the circumferential direction, they are adjacent to each other in the circumferential direction. A second gap G2 can be formed between the second protruding portion 62 of one coil end 13B and the outer coil piece 42 of the other coil end 13B.

As described above, since the stator coil according to the present embodiment has the first gap G1 and the second gap G2 in the coil end layer 50A and the coil end layer 50B, interference between the segment coils 11 is suppressed. As a result, it is possible to prevent the insulating film formed on the segment coil 11 from deteriorating. As a result, the stator coil according to the present embodiment can suppress insulation failure in the segment coil 11.

Further, since the stator coil according to the present embodiment has a first gap G1 and a second gap G2 in the coil end layer 50A and the coil end layer 50B, the stator coil has a first gap G1 and a second gap G2. It is possible to easily pass a cooling air for cooling the segment coil 11 or an ATF (Automatic Transmission Fluid). Therefore, the stator coil according to this embodiment can enhance the heat dissipation effect.

Further, in the stator coil according to the present embodiment, the inner diameter surface of the coil end layer 50A and the outer diameter surface of the coil end layer 50B are substantially arcuate when viewed from the axial direction, and their curvatures are substantially matched with each other. There is. Specifically, the inner diameter surface of the inner coil piece 31 of each coil end 13A constituting the coil end layer 50A and the outer diameter surface of the outer coil piece 42 of each coil end 13B constituting the coil end layer 50B are substantially abbreviated. It is arcuate and has the same curvature.

Therefore, the stator coil according to the present embodiment is for insulating the gap between the inner diameter surface of the coil end layer 50A and the outer diameter surface of the coil end layer 50B, that is, each coil end 13A and each coil end 13B. The insulation distance, which is the radial length of the gap, can be set to be constant, and the radial dimension of the slot 4 can be shortened.

Further, since the stator coil according to the present embodiment can shorten the radial dimension of the slot 4 as described above, the distance for connecting the connection portions of the coil ends 13 is shortened, and the connection work can be facilitated. can.

In this embodiment, a flat wire having a rectangular cross section is used as the segment coil 11, but the segment coil 11 is not limited to this, and a round wire having a circular cross section may be used as the segment coil 11.

Although embodiments of the present invention have been disclosed, it will be apparent to those skilled in the art that modifications may be made without departing from the scope of the invention. All such modifications and equivalents are intended to be included in the following claims.

1 Fixture 2 Fixture core 2a, 2b End face 3 Teeth 4 Slot 10 Fixture coil 11, 11A, 11B Segment coil 12 Slot accommodating part 12a Inner slot accommodating part 12b Outer slot accommodating part 13, 13A, 13B Coil end 15 Connection side Coil end 30 Top 31 Inner coil piece 31a, 31b End face 32 Outer coil piece 40 Top 41 Inner coil piece 42 Outer coil piece 42a, 42b End face 50A Coil end layer (outer coil end layer)
50B coil end layer (inner coil end layer)
60 Coil end pair 61 1st protrusion 61a One end 61b The other end 61c End face 62 Second protrusion 62a One end 62b The other end 62c End face 71 First bend 72 Second bend 73 Third bend 74 Fourth bend 80 Connection Part 80A Outer connection part 80B Inner connection part 82 Connection slot accommodating part 83 First coil end for connection (coil end for connection)
83a Bent part G1 first gap G2 second gap

Claims (6)

A stator coil composed of a plurality of segment coils provided in a stator in which a plurality of slots are formed and arranged in the slots.
The segment coil is
A pair of slot compartments that are housed in different slots,
It has a coil end that connects the pair of slot accommodating portions and projects axially from the pair of slot accommodating portions.
The pair of slot accommodating portions
An inner slot accommodating portion arranged on the inner side in the radial direction of the slot,
It has an outer slot accommodating portion arranged on the radial outer side of the slot with respect to the inner slot accommodating portion.
The coil end is
The top provided at the end in the axial direction and
An inner coil piece connecting the top and the inner slot accommodating portion,
It has an outer coil piece that connects the top and the outer slot accommodating portion.
A plurality of the coil ends are arranged so as to be aligned in the circumferential direction to form a coil end layer.
The coil end layer is
The inner coil pieces of the coil end adjacent to the circumferential direction are arranged so as to overlap each other in the axial direction, and the outer coil pieces of the coil end adjacent to the circumferential direction are arranged so as to overlap each other in the axial direction. Has been
Two coil end layers are arranged in the radial direction to form a set of coil end pairs.
At least one pair of coil end pairs is provided in the radial direction.
The pair of coil ends is
An outer coil end layer that is disposed on the radial outer side and has a first protrusion such that the top of the coil end projects outward in the radial direction.
A fixation characterized in that it is disposed inwardly in the radial direction and is composed of an inner coil end layer having a second protrusion such that the top of the coil end projects inward in the radial direction. Child coil. The top of the outer coil end layer of the coil end is
A first bent portion that is bent outward from the inner coil piece in the radial direction and connected to one end in the circumferential direction of the first protruding portion.
It has a second bent portion that bends outward from the outer coil piece toward the outer side in the radial direction and is connected to the other end in the circumferential direction of the first protruding portion.
The top of the inner coil end layer of the coil end has
A third bent portion that bends inward in the radial direction from the inner coil piece and is connected to one end in the circumferential direction of the second protruding portion.
The first aspect of the present invention is characterized by having a fourth bent portion that is bent inward in the radial direction from the outer coil piece and connected to the other end in the circumferential direction of the second protruding portion. The stator coil described. The segment coil is composed of a flat wire.
The radial dimension of the outer coil end layer between the radial inner end face of the inner coil piece and the radial inner end face of the first protrusion is D1, said. The radial dimension of the inner coil piece is W1.
The radial dimension of the inner coil end layer between the radial outer end face of the outer coil piece and the radial outer end face of the second protrusion is D2, said. When the radial dimension of the outer coil piece is W2,
The stator coil according to claim 1 or 2, wherein D1> W1 and D2> W2 are satisfied. In the outer coil end layer, a first gap is formed between the first protruding portion of one coil end of the coil ends adjacent in the circumferential direction and the inner coil piece of the other coil end. Coil,
In the inner coil end layer, a second gap is formed between the second protrusion of one coil end of the coil ends adjacent in the circumferential direction and the outer coil piece of the other coil end. Coil,
The fixing according to any one of claims 1 to 3, wherein the first gap and the second gap are arranged so as to overlap the slot in the axial direction. Child coil. Having a plurality of phases of the segment coil,
The segment coil of each phase is connected by a connection part connecting a plurality of coil ends of the same phase.
The connection part is
A plurality of wiring slot accommodating portions accommodated in the slot,
It has a pair of connection slot accommodating portions accommodated in different slots, and has a connection coil end protruding axially from the pair of connection slot accommodating portions.
When the segment coil is arranged in the slot, the height of the connection coil end protruding axially from the axial end face of the stator of the coil end protruding axially from the end face. The stator coil according to any one of claims 1 to 4, wherein the dimensions of the connection coil end and the coil end are set so as to be equal to or lower than the height. A stator comprising the stator coil according to any one of claims 1 to 5.

Images