JP7000170B2 - Rotating machine stator - Google Patents

Description

The present invention relates to a rotary electric machine stator.

Conventionally, a rotary electric machine used as a motor generator having a function of an electric motor, a generator, or both of these has been known. The rotary electric machine is configured by arranging the rotor inside the stator. The stator includes a stator core having a plurality of teeth extending radially inward from the annular yoke, and a stator coil wound around the teeth. For example, the stator coil has a three-phase coil group of U phase, V phase, and W phase.

Patent Document 1 describes a stator in which a stator coil is assembled to a stator core. The stator coil draws a plurality of lead wires outward in the radial direction from the plurality of coils arranged on the outermost periphery.

Japanese Unexamined Patent Publication No. 2017-108509

In the stator described in Patent Document 1, it is conceivable that the stator coil includes two sets of Y-connected three-phase coils. In this case, one end of each of the three-phase coils is connected by a neutral point bus bar, and the other end of the two in-phase coils is connected to one end of the power line on the power supply side. For this purpose, two lead wires drawn outward in the radial direction of the stator core are formed at the other end of the coil group having the same phase. In this case, since the two leader wires having the same phase are separated from each other in the circumferential direction, the metal member extending in the circumferential direction is sandwiched between the two leader wires and the power wire to connect them. This makes it necessary to weld at least three points, the two welding positions of the two leader wires and the metal member, and the welding positions of the power wire and the metal member.

An object of the rotary electric stator of the present invention is to reduce the number of welding points required for connecting the in-phase coil group and the power line when the stator coil includes two sets of Y-connected three-phase coils. be.

The rotary electric stator according to the present invention includes a stator core having a plurality of teeth extending radially inward from an annular yoke, and two sets of Y-connected three-phase coils, each of which has a plurality of coils. A stator coil having a plurality of coils wound around a tooth and connected in series, and a stator coil provided at the end of the coil group of each phase in each set, and pulled out so as to extend radially outward on the axially outer side of the stator core. A power line on the power supply side connected to the connection end of the lead wire is provided, and at least one of the two lead wires drawn from the coil group having the same phase is radially outward. The connection ends of the two lead wires are welded directly to the power line by being bent at one end to approach the connection end of the other lead wire.

According to the rotary electric stator according to the present invention, when the stator coil includes two sets of Y-connected three-phase coils, it is necessary to sandwich a metal member extending in the circumferential direction between the in-phase coil group and the power line. It disappears. As a result, the welded portion required for connecting the in-phase coil group and the power line is only the connection end of the two lead wires drawn out from the in-phase coil group and the welded portion with the power line. You can reduce the points.

In the rotary electric stator according to the present invention, preferably, the connection ends of the two leader wires extend parallel to the axial direction, and are welded to one end portions parallel to the axial direction of the power wire. ..

According to the above preferred configuration, the welded portion between the connecting end portion of the two leader wires and the one end portion of the power line can be lengthened in the axial direction, so that the welding strength can be increased.

In the rotary electric machine stator according to the present invention, preferably, the two leader wires are bent so as to extend in a direction parallel to the axial direction at the radial outer end portion, whereby the connection end portion is formed. The other leader cannot be bent toward the one leader in the circumferential direction.

According to the above preferred configuration, the machining time of the lead wire of the stator coil can be shortened.

In the rotary electric machine stator according to the present invention, preferably, the two leader wires are bent so as to extend in a direction parallel to the axial direction at the radial outer end portion, whereby the connection end portion is formed. The outer peripheral surface of one end of the power line is formed in a polygonal tubular shape, and the power line and 2 are in a state where the outer peripheral surface of one end of the power line and the connection end of the two lead wires are in surface contact with each other. The connection end of the book is welded.

According to the above preferable configuration, the welding strength between the power line and the two lead wires can be further increased.

According to the rotary electric stator of the present invention, when the stator coil includes two sets of Y-connected three-phase coils, the number of welding points required for connecting the in-phase coil group and the power line can be reduced.

It is a perspective view which shows a part in the circumferential direction of the rotary electric machine stator of embodiment of this invention. It is a perspective view which shows the state which the U-shaped coil wire is inserted into the slot of the stator core of the rotary electric machine stator. It is a figure which shows the state which each phase coil group of the stator coil of a rotary electric machine stator is connected. It is an enlarged perspective view which looked at the part A of FIG. 1 from a different direction with a part omitted. FIG. 5 is a perspective view showing a state in which two lead wires of two U-phase coil groups are connected to a power line in a rotary electric machine stator of a comparative example, partly omitted. It is a figure corresponding to FIG. 4 in the rotary electric machine stator of another example of embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The shapes, materials, and numbers described below are examples for explanation and can be appropriately changed according to the specifications of the rotary electric machine stator. In the following, the equivalent elements will be described with the same reference numerals in all the drawings. In addition, in the explanation in the text, the reference numerals described earlier shall be used as necessary.

In the following drawings and description of the embodiment, R indicates the radial direction of the rotary electric machine stator, θ indicates the circumferential direction of the rotary electric machine stator, and Z indicates the axial direction of the rotary electric machine stator. The tangential directions of R, Z, and θ are orthogonal to each other.

FIG. 1 is a perspective view showing a part of the rotary electric machine stator 10 of the embodiment in the circumferential direction. Hereinafter, the rotary electric machine stator 10 will be referred to as a stator 10. As shown in FIG. 1, the stator 10 includes a stator core 12 and a stator coil 20.

FIG. 2 is a perspective view showing a state in which the U-shaped coil wire 26 is inserted into the slot 15 of the stator core 12. The stator core 12 is an annular magnetic component, and is configured by, for example, laminating a plurality of silicon steel plates (electromagnetic steel plates) in the axial direction Z. The stator core may be formed by pressure molding a resin binder and a magnetic material powder.

The stator core 12 has a yoke 13 which is annularly arranged on the outer peripheral side, and a plurality of teeth 14 extending in the radial direction R from the inner peripheral surface of the yoke 13. The plurality of teeth 14 are arranged at intervals in the circumferential direction θ. A slot 15 which is a groove is formed between two adjacent teeth 14.

Returning to FIG. 1, the stator coil 20 includes two sets of three-phase stator coils 21 and 22. The first set of three-phase stator coils 21 has U, V, and W three-phase coil groups 23u, 23v, and 23w extending in a spiral shape. The second set of three-phase stator coils 22 has U, V, and W three-phase coil groups 24u, 24v, and 24w extending spirally. Each of the U, V, and W three-phase coil groups 23u, 24u, 23v, 24v, 23w, and 23w is inserted into the slot 15 and is inserted into the plurality of teeth 14 so as to straddle the plurality of teeth 14 (FIG. 2). It is wound. In the following, the first set of three-phase coil groups 23u, 23v, 23w are collectively referred to as the three-phase coil group 23, and the second set of three-phase coil groups 24u, 24v, 24w are collectively referred to. It may be described as a three-phase coil group 24. In FIG. 1, an annular stator cuffer 50 is arranged at the other end of the stator core 12 in the axial direction (upper end of FIG. 1). The stator cuffer 50 has a plurality of radial R pillars 51 that overlap the plurality of teeth 14 of the stator core 12, and the radial R inner end and the radial R outer end of the plurality of pillars 51 are inner rings (FIG. FIG. Not shown), connected by an outer ring 52. In the stator, the stator cuffer may be omitted.

Each of the U, V, and W three-phase coil groups 23 and 24 is formed by connecting a plurality of segment coils 25 in series. Each segment coil 25 is formed of a plurality of substantially U-shaped coil wires 26 shown in FIG.

The coil wire 26 is formed in a U shape by covering the intermediate portion in the length direction of the conductor wire 27, which is a rectangular wire having a rectangular cross section, with the insulating film 28, and exposing both ends of the conductor wire 27 from the insulating film 28. To. FIG. 2 shows a case where only two U-shaped coil wires 26 are inserted into the slot 15, but the same applies to the other coil wires.

When forming each segment coil 25 (FIG. 1), a plurality of coil wires 26 arranged in the radial direction R (FIG. 1) straddle the axial Z one end surface (lower end surface of FIG. 2) of the plurality of teeth 14. Then, the plurality of coil wires 26 are inserted into the two slots 15 located on both sides of the plurality of teeth 14. At this time, the protruding portion, which is the end portion of the pair of leg portions of the coil wire 26, is projected from the other end surface (upper end surface in FIG. 1) of the stator core 12 in the axial direction. Then, after the protruding portions of the plurality of coil wires 26 are bent in the circumferential direction, the tip portions of the protruding portions of the coil wires 26 overlapped in the radial direction R so that the plurality of coil wires 26 are connected to form a spiral. Is welded by laser welding or the like. At this time, in the coil wire 26, the exposed portion of the conductor strand 27 is welded. As a result, each segment coil 25 is wound around the plurality of teeth 14 so as to straddle the plurality of teeth 14. Further, each of the U, V, and W three-phase coil groups 23 and 24 is formed in an annular shape by connecting the ends of the plurality of segment coils 25.

FIG. 3 is a diagram showing a state in which the phase coil groups 23 and 24 of the stator coil 20 are connected. In the three-phase stator coils 21 and 22 of each set, the segment coils 25 (FIG. 1) are electrically connected in series in each of the three phases U, V, and W, so that the coil groups 23 and 24 of the respective phases are connected. Is formed. One ends of the coils 23 and 24 of each phase are Y-connected by being connected at the neutral point C, which is the neutral point bus bar. The neutral point bus bar is arranged, for example, at the outer peripheral end of the stator core 12, although the specific structure is not shown. FIG. 3 shows a state in which two sets of three-phase stator coils 21 and 22 are connected at a common neutral point C, but two sets of three-phase stator coils may have different neutral points. ..

Further, as shown in FIG. 1, the lead wires 30u, 30v, and 30w of the first set are provided at the other ends of the coil group 23 of the first set of three phases. At the other end of each of the second set of three-phase coil groups 24, the second set of lead wires 31u, 31v, 31w are provided. In the following, the first set of leader wires 30u, 30v, 30w are collectively referred to as a three-phase leader wire 30, and the second set of leader wires 31u, 31v, 31w are collectively referred to as a three-phase leader wire. It may be described as 31.

In each of the lead wires 30 and 31, the portion of the other end of the coil group 23 and 24 of each set drawn out from the axial Z other end (upper end in FIG. 1) of the stator core 12 in each phase is radially R. It is formed by being pulled out so as to extend outward. One ends of the power lines 40u, 40v, 40w connected to the power supply side are connected to the connection end portions 32, 33 provided at the radial R outer end portions of the lead wires 30 and 31. One end of the power lines 40u, 40v, 40w is formed in a columnar shape. In the following, the power lines 40u, 40v, and 40w may be collectively referred to as the power line 40. Each connection end portion 32, 33 is a portion formed at the radial R outer end portion of each lead wire 30, 31 and extending in a direction parallel to the axial direction Z.

At this time, of the two leader wires 30 and 31 drawn from the in-phase coil groups 23 and 24, one leader wire 30 approaches the connection end portion 33 of the other leader wire 31 at the radial outer end portion. Can be bent into. On the other hand, of the two leader wires 30 and 31 drawn from the in-phase coil groups 23 and 24, the other leader wire 31 is not bent toward the one leader wire 30 in the same phase in the circumferential direction. Then, the connecting ends 32, 33 of the two lead wires 30 and 31 of the same phase are directly welded to one end of a columnar column parallel to the axial direction Z of the power line 40.

FIG. 4 is an enlarged perspective view of part A of FIG. 1 as viewed from a different direction with a part omitted. Hereinafter, the U-phase coil groups 23u and 24u will be basically described. The two lead wires 30u and 31u provided at the other ends of the two sets of U-phase coils 23u and 24u are adjacent to each other with a gap in the circumferential direction θ of the stator core 12 (FIG. 1). It extends outward from the other end in the axial direction toward the radial R outside of the stator core 12. The connecting ends 32 and 33 of the two leader wires 30u and 31u extend in a direction parallel to the axial direction Z. One of the two leader wires 30u and 31u is located at substantially the same position in the radial direction R as the connection end portion 33 of the other leader wire 31u, and is on the peripheral side of the connection end portion 33 of the other leader wire 31u. It is bent at a substantially right angle to one side in the direction (lower left side in FIG. 4) and extends in the circumferential direction θ. One end of one lead wire 30u extending in the circumferential direction θ is bent at a substantially right angle in the vicinity of the connection end 33 of the other lead wire 31u so as to face a direction parallel to the axial direction Z.

Then, the planar side surface 32a of the connection end portion 32 of one leader wire 30u and the planar side surface 33a of the connection end portion 33 of the other leader wire 31u are arranged at a substantially right angle. At the same time, the outer peripheral surface of one end of the columnar column parallel to the axial direction Z of the U-phase power line 40u comes into line contact with these planar side surfaces 32a and 33a, respectively. In this state, the connection ends 32 and 33 of the two U-phase lead wires 30u and 31u and one end of the U-phase power line 40u are welded by TIG welding, laser welding or the like. At this time, each of the side surfaces 32a and 33a of the connection ends 32 and 33 of the two leader wires 30u and 31u and one end of the power line 40u are welded at two positions shown by points P1 and P2 in FIG. can do. It should be noted that the connection ends 32 and 33 of the two leader wires 30u and 31u and the power line 40u may be welded to each other in one portion surrounded by a frame indicated by Q in FIG. In the above, the connection portion of the two lead wires 30u and 31u of the U phase has been described, but the same applies to the connection portion of the two lead wires 30v, 31v, 30W and 31w (FIG. 1) of the V phase and the W phase. Is.

According to the above-mentioned stator 10, when the stator coil 20 includes two sets of Y-connected three-phase coil groups 23 and 24, the same-phase coil groups 23 and 24 and the power lines 40u, 40v and 40w rotate around the stator coil 20. There is no need to pinch a metal member that extends in the direction θ. As a result, the welded portion required for connecting the in-phase coil groups 23 and 24 and the power line 40 becomes the connection end portions 32 and 33 of the two lead wires 30 and 31 drawn from the in-phase coil groups 23 and 24. , Only the welded part with the power line 40. Therefore, the number of welding points required for connecting the in-phase coils 23 and 24 and the power line 40 can be reduced to two or one in each phase.

Further, the connection end portions 32 and 33 of the two lead wires 30 and 31 having the same phase extend in parallel with the axial direction Z, respectively, and are welded to one end portion parallel to the axial direction Z of the power line 40, respectively. As a result, the welded portion between the connecting ends 32, 33 of the two lead wires 30 and 31 and one end of the power line 40 can be lengthened in the axial direction Z, so that the welding strength can be increased.

Further, the two leader wires 30 and 31 having the same phase are bent so as to extend in the direction parallel to the axial direction Z at the outer end portion in the radial direction R to form the connecting end portions 32 and 33. Of the two leader wires 30 and 31 of the same phase, the other leader wire 31 is not bent toward the one leader wire 30 in the circumferential direction θ. As a result, the machining time of the lead wires 30 and 31 of the stator coil 20 can be shortened. Therefore, the productivity, reliability, and product value of the stator 10 can be improved.

FIG. 5 is a perspective view showing a state in which two lead wires 37u and 38u of two U-phase coil groups 35u and 36u are connected to a power line 40u in a stator of a comparative example. .. In the comparative example, two lead wires 37u and 38u drawn from the two U-phase coil groups 35u and 36u and adjacent to each other in the circumferential direction θ have diameters outside the axial Z other end (upper end in FIG. 5) of the stator core 12. Direction R extends outward. Then, at the radial R outer end portion of the portion of the two leader wires 37u and 38u extending outward in the radial direction, the connection end portion is bent at a substantially right angle so as to face the direction parallel to the axial direction Z. 39a and 39b are formed. A rectangular parallelepiped metal member 43 extending in the circumferential direction is sandwiched between one end of the power line 40u parallel to the axial direction Z and the connecting ends 39a and 39b of the two lead wires 37u and 38u.

In such a comparative example, two welding positions of the two lead lines 37u and 38u and the metal member 43 (the portion surrounded by the alternate long and short dash lines S1 and S2 in FIG. 5), and the power line 40u and the metal member 43 are used. It is necessary to weld at least three points at the welding position (the portion surrounded by the alternate long and short dash line S3 in FIG. 5). As a result, the welding work becomes complicated and the welding time becomes long. Further, since the metal member 43 is required, the number of parts increases, which causes an increase in cost. According to the embodiments shown in FIGS. 1 to 4 above, such inconvenience can be eliminated.

FIG. 6 is a diagram corresponding to FIG. 4 in the stator of another example of the embodiment. In another configuration shown in FIG. 6, the power line 41u is a polygonal cylinder having two flat surface portions 42a and 42b whose outer peripheral surfaces at one end are adjacent at right angles by processing a columnar portion at one end. It is formed in a shape. The two adjacent flat surfaces 42a and 42b on the outer peripheral surface of one end of the power line 41u are in surface contact with the planar side surfaces 32a and 33a of the connecting ends 32 and 33 of the two lead wires 30u and 31u. .. In this state, one end of the power line 41u and the connection ends 32 and 33 of the two lead wires 30u and 31u are welded. In the above, the connection portion of the lead wire of the U phase has been described, but the same applies to the V phase and the W phase. As a result, the contact portion between one end of the power line 41u and the connection ends 32 and 33 of the lead wires 30u and 31u is in a surface contact state, and the welding strength can be further increased. In this example, other configurations and operations are the same as those of the embodiments of FIGS. 1 to 4.

Although not shown, in each of the above embodiments, both of the two leader wires having the same phase are bent at substantially right angles in the directions facing each other in the circumferential direction so as to be closer to the connection end of the leader wire on the other side. May be.

Further, in the above, the case where the stator coil is formed by a plurality of segment coils formed by bending a plurality of U-shaped coil wires and then connecting the stator coils has been described. On the other hand, the configuration of the present invention is applied when the stator coil is formed by bending a plurality of circular wire conductors having a circular cross section to include two sets of Y-connected three-phase coils. You may.

Further, in the above, the case where the stator coil includes two sets of Y-connected three-phase coils and each coil group has a plurality of coils connected in series has been described. On the other hand, the stator coil may include three or more sets of n sets of Y-connected three-phase coils, and each coil group may have a plurality of coils connected in series. In this case, the (n-1) lead wires may be bent so as to approach the connection end of the one lead wire so that the n leader wires of the same phase are concentrated in one.

10 rotary electric machine stator (stator), 12 stator core, 13 yoke, 14 teeth, 15 slots, 20 stator coil, 21,22 3-phase stator coil, 23u, 23v, 23w, 24u, 24v, 24w coil group, 25 segment coil, 26 coil wire, 27 conductor wire, 28 insulation film, 30u, 30v, 30w, 31u, 31v, 31w lead wire, 32,33 connection end, 32a, 33a side surface, 35u, 36u coil group, 37u, 38u lead wire , 39a, 39b connection end, 40u, 40v, 40w, 41u power line, 42a, 42b flat surface, 43 metal member, 50 stator cuff, 51 pillar, 52 outer ring.

Claims (2)

A stator core with multiple teeth extending radially inward from the annular yoke,
A stator coil comprising two sets of Y-connected three-phase coils, each of which has a plurality of coils wound around the plurality of teeth and connected in series.
A power line on the power supply side, which is provided at the end of the coil group of each phase in each set and is connected to the connection end of the lead wire drawn out so as to extend radially outward on the axially outer side of the stator core. Equipped with
Of the two leaders drawn radially outward along the axial end face of the stator core from the radial outer end of the coil in the same phase coil group, one of the leaders is the radial outer end. The other connecting end of the two leaders is bent closer to the connecting end of the other lead wire so that the connecting end of the two leaders is directly welded to the power line.
The connecting ends of the two leader wires extend parallel to the axial direction, respectively.
The connection end of the one lead wire is welded to a portion of one end parallel to the axial direction of the power line, which faces the circumferential direction of the stator core.
The connecting end of the other lead wire is welded to the radially opposed portion of the stator core of the one end of the power line.
Rotary machine stator. A stator core with multiple teeth extending radially inward from the annular yoke,
A stator coil comprising two sets of Y-connected three-phase coils, each of which has a plurality of coils wound around the plurality of teeth and connected in series.
A power line on the power supply side, which is provided at the end of the coil group of each phase in each set and is connected to the connection end of the lead wire drawn out so as to extend radially outward on the axially outer side of the stator core. Equipped with
Of the two leaders drawn from the in-phase coil group, at least one of the leaders is bent at the radial outer end to approach the connecting end of the other leader. The connecting ends of the two leader wires are welded directly to the power line.
The two lead wires are bent so as to extend in a direction parallel to the axial direction at the outer end portion in the radial direction to form the connection end portion, and the outer peripheral surface of one end portion of the power line is a polygonal cylinder. The power line and the two connection ends are welded in a state in which the outer peripheral surface of one end of the power line and the connection end of the two lead wires are in surface contact with each other.
Rotary machine stator.

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