DE112017000121T5 - Winding structure of a stator for a rotating electrical machine - Google Patents

Abstract

In the present invention, in order to provide a winding structure of a stator for a rotary electric machine in whose stator the height of one coil end is kept low, the first two-loop endless coils CA1 to CA4 and the second two-loop endless coils CB1 to B4 become so wherein starting points a7, a5 and a3 of the first two-loop endless coils CA on an outer peripheral side and input points a6, a4 and a2 of the first two-loop endless coils CA on an inner peripheral side, are deviated from each other by six slot pitches in one rotational direction; the points of which are adjacent to each other in a radial direction RCA are respectively connected in series, starting points b7, b5 and b3 of the second two-loop endless coils CB on the outer peripheral side and input points b6, b4 and b2 of the second two-loop endless coils CB on the inner peripheral side whose points are adjacent in a radial direction RCB, i n series are connected, wherein a starting point a1 of the first two-loop endless coil CA1 in an innermost circumference and a starting point b1 of the second two-loop endless coil CB1 are connected in the innermost circumference, wherein an entry point a8 of the first two-loop Continuous coil CA4 is at the outermost circumference a current input point of a single-phase coil, and an input point b8 of the second two-loop endless coil CB4 in the outermost periphery is a current output point of the single-phase coil.

Description

area

The present invention relates to a winding structure of a stator for a rotary electric machine, wherein a height of a coil end can be kept low.

background

Recently, in the automotive industry, a wave winding is used as a main winding method for a square wire. A wave winding using a square wire is formed by coupling a plurality of pine needle-shaped segment conductors. Leading ends on sides which are provided below the leading ends of segment conductors so as to be adjacent to each other in a circumferential direction are closer to each other, are connected, thereby forming a wave form. In a wave winding, there is an advantage that the magnetomotive force can be increased as the number of turns is increased and that the current can be reduced within a range of the voltage saturation.

Note that in Patent Literature 1, conductors formed in waveform are connected by a connection part, thereby configuring a stator winding wire. It should be noted that a connection part is arranged on an upper side of a crank part, i. at an upper part of a ladder.

CITATION

patent literature

Patent Literature 1: Japanese Laid-Open Patent Publication No. 2011-109894

Summary

Technical problem

However, in a wave winding, the number of wire connection points (welding points) is increased as the number of turns increases. In proportion to an increase in the number of turns, a connecting wire is increased. Initially, it makes sense to keep the height of a coil end low by using a square wire. However, a height of a coil end becomes larger due to the increase of a connecting wire. In addition, although a feeding point of each phase may be connected from an outer peripheral side of a stator, a neutral point needs to be connected by extending from an inner peripheral side to the outer peripheral side of the stator. Thus, a coil end becomes high.

The present invention is provided in light of the above and is intended to provide a winding structure of a stator of a rotary electric machine in which a height of a coil end can be kept low.

Solution to the problem

In order to solve the problem and solve the problem, in a winding structure of a stator for a rotary electric machine according to the present invention in the stator, a wave winding of a coil having a predetermined slot pitch with respect to a stator core with a plurality of teeth and a plurality of slots alternately and annularly formed in a circumferential direction, wherein a plurality of two-layered wave winding coils are arranged in a radial direction and each of the two-layered wave winding coils has a first two-loop endless coil in which an entry point and a starting point are formed on the guide part side, and a wave winding is performed by two loops of a coil in the predetermined slot pitch in two columns in the circumferential direction, and a second two-loop endless coil having a same configuration as the first two-loop endless coil, and the ang is arranged to deviate from the first two-loop endless coil by the predetermined slot pitch in the circumferential direction, and the input point and the starting point of the first two-loop endless coil are arranged in the same radial direction, and the input point and the starting point of the second two-loop endless coil are arranged in the same radial direction, and a starting point of the first two-loop endless coil on an outer peripheral side and an input point of the first two-loop endless coil are connected in series on an inner peripheral side and the points in the radial direction to each other wherein an origin of the second two-loop endless coil on the outer peripheral side and an input point of the second two-loop endless coil on the inner peripheral side are connected in series and the dots are adjacent to each other in the radial direction, with a starting point of the first two-loop. Loop endless coil in e in the innermost periphery and a starting point of the second two-loop endless coil are connected in the innermost circumference, wherein an entry point of the first two-loop endless coil at an outermost circumference is a current input point of a single-phase coil, and an input point of the second two-loops - Endless coil in the the outermost circumference is a current output point of the single-phase coil.

Further, in the winding structure of a stator for a rotary electric machine according to the present invention, in the first two-loop endless coil and the second two-loop endless coil, a pine needle-shaped segment conductor is inserted into the slots from the guide part side, and an end part of the segment conductor a coupling of the starting point of the first two-loop endless coil on the outer peripheral side and the entry point of the first two-loop endless coil on the inner peripheral side, wherein the points are adjacent to each other in the radial direction, a coupling of the The output point of the second two-loop endless coil on the outer peripheral side and the input point of the second two-loop endless coil on the inner peripheral side, wherein the points are adjacent in the radial direction, and a coupling of the starting point of the first two-loop endless coil the innermost circumference and the starting point of the second two-loop endless coil are connected in the innermost circumference by a pine needle-shaped segment conductor having a slot insertion part.

Further, in the winding structure of the stator for a rotary electric machine according to the present invention, with m as an integer equal to or greater than 1 and with the number of turns N in the radial direction as N = 2m + 2, a starting point at one Position of the number of turns (N - (2m-1)) and an entry point at a position of the number of turns (N - 2m) in a plurality of first two-loop endless coils through a pine-needle-shaped segment conductor having a slot insertion part connected to each other, and a starting point at a position of the number of turns (N - (2m-1)) and an entry point at a position of the number of turns (N - 2m) in a plurality of second two-loop endless coils through a pine needle-shaped segment conductor having a Slots insert part has, connected to each other.

Further, in the winding structure of the stator for a rotary electric machine according to the present invention, the first two-loop endless coil and the second two-loop endless coil are wound so as to intersect each other in the radial direction at the predetermined slot pitch.

Further, in the winding structure of the stator for a rotary electric machine according to the present invention, three single-phase coils are arranged adjacent in the circumferential direction, and a single star connection is made with one current input point of each of the single-phase coils which is a feeding point of each phase and with one current output point each the single-phase coil, which is a neutral point connection point.

Further, in the winding structure of the stator for a rotary electric machine according to the present invention, the predetermined slot pitch is a value corresponding to the number of slots divided by the number of poles of a rotor.

Further, the slots in the winding structure of the stator for a rotary electric machine according to the present invention have a semi-closed slot shape.

According to the present invention, a starting point of a first two-loop endless coil on an outer peripheral side and an entry point of a first two-loop endless coil on an inner circumferential side whose points are adjacent in a radial direction are connected in series, with a starting point of a second two A loop-end endless coil on the outer peripheral side and an input point of a second two-loop endless coil on the inner peripheral side, the points of which are adjacent to each other in the radial direction are connected in series, wherein a starting point of a first two-loop endless coil at an innermost circumference and a starting point of a second two-loop endless coil at the innermost circumference are connected, wherein an input point of a first two-loop endless coil at an outermost circumference is a current input point of a single-phase coil, and an input point of a second two-loop endless coil at the outermost circumference a current output point of the single-phase coil. With this arrangement, a current input point and a current output point of a single-phase coil are disposed on a side of an outermost circumference of a slot. Thus, it is possible to keep a height of a coil end low on a guide part side and keep a resistance value of a coil low because the circumference of a coil is short.

list of figures

• 1 FIG. 12 is a view illustrating a state in which a wave winding wire in the configuration of a stator for a rotary electric machine is wound around a stator core whose stator is used in a rotary electric machine such as a permanent magnet type rotary electric machine.
• 2 Fig. 15 is a perspective view illustrating a winding state of a first two-loop endless coil.
• 3 Fig. 13 is a view illustrating the first two-loop endless coil extending straight and viewed from a guide part side
• 4 FIG. 12 is a perspective view illustrating a winding state of a case in which the first two-loop endless coil is arranged in an outer circumferential direction. FIG.
• 5 FIG. 12 is a view illustrating a two-layered wave winding coil in which a second two-loop endless coil having the same configuration as the first two-loop endless coil is shifted and arranged by six slot pitches to a rotational direction side, and which extends in a straight line and viewed from the guide part side.
• 6 FIG. 15 is a perspective view illustrating a winding state of the double-layered wave winding coil in which the second two-loop endless coil having the same configuration as the first two-loop endless coil is shifted and arranged at six slot pitches to the rotational direction side.
• 7 FIG. 12 is a cross-sectional view illustrating a winding state of a wave winding coil of a phase. FIG.
• 8th Figure 11 is a view illustrating the coupling between first two-loop endless coils, between second two-loop endless coils and between a first two-loop endless coil and a second two-loop endless coil.
• 9 FIG. 15 is a view illustrating a winding state of a case where the coupling that is in 8th is represented by a pine needle-shaped segment conductor.
• 10 FIG. 15 is a perspective view illustrating a stator for a rotary electric machine whose stator is in the state shown in FIG 9 is shown coupling state and viewed from the guide part side.
• 11 FIG. 15 is a perspective view illustrating the stator for a rotary electric machine when viewed from an opposite side of a guide member. FIG.
• 12 FIG. 15 is a view for describing a coupling state of a housing having an eight-turn configuration using four two-layered wave winding coils. FIG.
• 13 FIG. 14 is a view for describing a coupling state of a case of a four-turn configuration using two two-layer wave winding coils. FIG.
• 14 Fig. 12 is a view for describing a coupling state of a case having a six-turn configuration using three two-layer wave winding coils.
• 15 Fig. 10 is a view for describing a coupling state of a case having a ten-turn configuration using five two-layered wave winding coils.
• 16 Fig. 12 is a view for describing a coupling state of a case having a twelve-turn configuration using six two-layered wave winding coils.
• 17 Fig. 12 is a view for describing a coupling state of a case having a fourteen-turn configuration using seven two-layered wave-winding coils.
• 18 between pine-needle-shaped segment conductors for connecting two-loop endless coils in a first two-loop endless coil and a second two-loop endless coil and a connection relationship between the first two-loop endless coil and the second two-loop endless coil are generalized.
• 19 FIG. 12 is a cross-sectional view of a stator core of a case where a slot has a half-closed slot shape. FIG.

Description of embodiments

Hereinafter, an embodiment of this invention will be described with reference to the accompanying drawings.

1 FIG. 12 is a view illustrating a state in which a wave winding wire is wound around a stator core during the configuration of a stator for a rotary electric machine whose stator is used in a rotary electric machine such as a permanent magnet type rotary electric machine. As in 1 is shown in a stator core 1 several teeth 2 and several slots 3 annular and regular in a circumferential direction RT formed on an inner peripheral side, which is a side of a region E, in which a rotor is inserted. In 1 , are 48 slots 3 educated. It should be noted that the number of poles of a rotor (not shown) is eight. A rotating electrical machine also has the function of an electric motor and / or a generator. It should be noted that the stator core 1 is formed by laminating a plurality of annular magnetic steel sheets.

In the present embodiment, a winding wire is around the stator core 1 is wound in a wave winding mold with a plurality of segment conductors 10 educated. Both end portions of the pine needle-shaped segment conductors 10 are from a guide part side (feed unit side) 1a in the slots 3 introduced with a predetermined slot spacing in the direction of a central axis AX. A part protruding from a side opposite to the guide part side 1b, that is, a part that protrudes from a slit insertion part of each of the inserted segment conductors 10 protrudes, is bent so that it is in the circumferential direction RT extends, and a leading end 10a of a segment conductor 10 is with a leading end 10a of an adjacent other segment conductor 10 welded. With this welding, a first two-loop endless coil CA1, which is a wave winding wire, is the multiple segment conductor 10 has formed. It should be noted that it is preferable that a winding wire is a square wire, and more particularly a rectangular wire, for keeping a height of a coil end low.

2 FIG. 15 is a perspective view illustrating a winding state of the first two-loop endless coil. FIG. Also 3 (a) FIG. 13 is a view illustrating the first two-loop endless coil CA1 extending straight and viewed from the guide part side 1a. In the first two-loop endless coil CA1, the leading ends 10a of the segment conductors 21 to 28 are connected in series by welding on the side opposite to the guide member 1b side. Both end portions of each of the segment conductors 22 to 24 and 26 to 28 are inserted into the slots 3 introduced at six slot intervals. The segment conductors 22 and 26, 23 and 27 and 24 and 28 are inserted so that they differ from each other by a slot spacing. In addition, the segment conductors 22 to 24 are arranged so that they are separated from each other for six slot spacings. Similarly, the segment conductors 26-28 are arranged to be separated from one another for six slot spacings. The segment conductor 21 is in a connected area EA is disposed and is inserted into the slots 3 at seven slot intervals and separated on the guide part side 1a. The segment conductor 21 has a segment conductor 21a, which has an input point a2 which is a separate end part, and a segment conductor 21b having a starting point a1 which is the other end part. In addition, the segment conductor 25 is in the connected area EA a function for connecting a coil of a first loop to a coil of a second loop, both end portions of which are in the slots 3 introduced at five slot spacings. The segment conductor 25, which is arranged between the segment conductors 24 and 26, is arranged such that it is separated from each of the segment conductors 24 and 26 by six slot spacings.

The welded parts T21 to T28 connect, by welding, leading ends of segment conductors which are adjacent to each other on the side opposite to the guide member 1b side. The welded part T21 connects the segment conductors 21a and 22. The welded part T22 connects the segment conductors 22 and 23. The welded part T23 connects the segment conductors 23 and 24. The welded part T24 connects the segment conductors 24 and 25. The welded part T25 connects the segment conductors 25 and 26 The welded part T26 connects the segment conductors 26 and 27. The welded part T27 connects the segment conductors 27 and 28. The welded part T28 connects the segment conductors 28 and 21b.

A stream coming from the entry point a2 is introduced, flows serially in the segment conductor 21a, the welded part T21 , the segment conductor 22, the welded part T22, the segment conductor 23, the welded part T23, the segment conductor 24, the welded part T24, and the segment conductors 25 in a clockwise direction CW and ends up flowing in a first wave winding at the end of the river. Then, the current flows serially in the segment conductor 25, the welded part T25, the segment conductor 26, the welded part T26, the segment conductor 27, the welded part T27, the segment conductor 28, the welded part T28 and the segment conductor 21b, ending in a second one Wave winding to flow and reaches the starting point a1 , As in 3 (a) As shown, current directions of the conductors arranged in adjacent slots, such as the conductors arranged in a slot position 6 and a slot position 7, are the same.

Here is the first two-loop endless coil CA1 in zigzag shape in the slots 3 is wound at six slot intervals and is alternately between a layer L1 on an inner peripheral side and a layer L2 on an outer peripheral side, the layers of which are adjacent in the radial direction, wound. It should be noted that a layer has a winding position in the slots 3 indicates that an inner peripheral side toward an outer peripheral side in series as layers L1 , L2, ... and L8. Because the segment conductors in the stator core 1 are arranged in an arc shape in the circumferential direction, a winding wire of a first loop and a winding wire of a second loop intersect each other on the guide part side 1a and the opposite guide part side 1b.

For example, the segment conductor 27 extending from a layer extends L1 is pulled out to the guide part side 1a, in the circumferential direction, is shifted to a position of a layer L2 on a pine-needle-shaped crown part 27t (see FIG 2 ), further extends in the circumferential direction and enters a layer L2 of a slot at a sixth slot pitch. Similarly, the segment conductor 23, which is arranged to deviate by one slot pitch, is made of one layer L1 pulled out to the guide part side 1a extends in the circumferential direction, becomes a position of a layer L2 on a pine needle-shaped vertex part 23t shifted further extends in the circumferential direction and enters a layer L2 of a slot at a sixth slot spacing. Here, the segment conductor 23 is placed under the segment conductor 27 so as not to leave the layer L1 to the guide part side 1a and until reaching the apex part 23t is pulled out, and is above the segment conductor 27 of the apex part 23t until entry into the layer L2 of the slot of the sixth slot spacing. Each of the apexes 27t and 23t has a chevron shape projecting upward, whereby a deviation for a slot pitch corresponding to a deviation for a slot pitch of the segment conductors 27 and 23 is generated. The apex portions 27t and 23t are displacement points at which the segment conductors 27 and 23 from the layer L1 are shifted to the layer L2 and differ by a slot distance from each other. Thus, an intersection in which the segment conductors 27 and 23 are vertically inverted is performed at positions of the vertices 27t and 23t. With this overlap, a rectangular wire is not twisted and a height at each coil end can be kept low.

4 FIG. 15 is a perspective view showing a winding state of a case in which first two-loop endless coils CA2 to CA4 having the same configuration as the first two-loop endless coil CA1 are arranged in series in an outer peripheral direction. It should be noted that, as in 3 is shown, the first two-loop endless coil CA2 is alternately wound between the layers L3 and L4. In addition, the first two-loop endless coil CA3 is alternately wound between the layers L5 and L6. Moreover, the first two-loop endless coil CA4 is alternately wound between the layers L7 and L8. In this case, the entry points become a2 , a4, a6 and a8 and the starting points a1 , a3, a5 and a7 of the first two-loop endless coils CA (CA1 to CA4) in a connected area EA collected and arranged in a straight line in the radial direction RCA.

Here in 3 (b) are the starting point a7 and the entry point a6, the starting point a5 and the entry point a4, and the starting point a3 and the entry point a2 each connected to each other, whereby a wave winding coil from the input point a8 to the starting point a1 is formed. That is, the first two-loop endless coils CA1 to CA4 are connected by coupling in the connected area EA connected in series. In addition, by this coupling, the current directions of the conductors arranged in the same slot as the conductors in the layers are L1 , L3, L5 and L7 at a slot position 7, the same.

In addition, as in 5 (a), a second two-loop endless coil CB <b> 1 having the same configuration as the first two-loop endless coil CA <b> 1 is arranged so as to be six slot pitches in the clockwise direction CW is moved. With this arrangement, a two-layered wave winding coil in which the second two-loop endless coil CB1 is wound in an empty layer of each slot where the first two-loop endless coil CA1 passes over the two layers L1 and L2 is formed. Here, it is necessary that current directions of conductors disposed in the same slot are wound around the one coil, such as the conductors in the layer L1 and the layer L2 at the slot position 7, are the same. Thus, if the entry point a2 of the first two-loop endless coil CA1 is a current input point, an input point b2 of the second two-loop endless coil CB1 becomes a current output point, and a starting point b1 thereof becomes a current input point. As in 5 (a) As shown, the current directions of the coils in the same slot become the same in this arrangement. It is to be noted that the entry point b2 and the starting point b1 of the second two-loop endless coil CB1 are arranged in a connected area EB, that of the connected area EA shifted by six slot intervals.

Then, as in 5 (b) and 6 That is, similarly to the first two-loop endless coils CA1 to CA4, the second two-loop endless coils CB2 to CB4 having the same configuration as the second two-loop endless coil CB1 are shown in an outer circumferential direction (radial direction RCB). arranged in a row. That is, four two-layered wave winding coils are arranged in the outer circumferential direction. With this arrangement, input points b2, b4, b6 and b8 and output points b1, b3, b5 and b7 of the second two-loop endless coil become CB (CB1 to CB4) are collected in the connected region EB and arranged in a straight line in the radial direction RCB.

As in 7 With the arrangement of the above-described first two-loop endless coils CA1 to CA4 and second two-loop endless coils CB1 to CB4, coils in eight layers (FIGS. L1 to L8) are arranged tightly in adjacent two slots such that they are around six Slot spacing in the circumferential direction RT are shifted.

As in 8th In the present embodiment, the starting point a7 and the entry point a6, the starting point a5 and the entry point a4, and the starting point a3 and the entry point are shown a2 connected to each other in the first two-loop endless coils CA1 to CA4, the starting point b7 and the input point b6, the starting point b5 and the input point b4, and the starting point b3 and the input point b2 are connected to each other in the second two-loop endless coils CB1 to CB4 connected, and the starting point a1 The first two-loop endless coil CA1 in an innermost circumference and the starting point b1 of the second two-loop endless coil CB1 in the innermost circumference are connected to each other. With this arrangement, there are current directions of conductors arranged in the same slot in which a coil is wound, such as the conductors in the layer L1 and the layer L2 in the slot position 7, the same. A current input from the input point a8 of the first two-loop endless coil CA4 at an outermost circumference also reaches the starting point a1 of the first two-loop endless coil CA1 and becomes the second two-loop endless coil CB1 at the innermost circumference by coupling the output point a1 and the output point b1 and is output from the input point b8 of the second two-loop endless coil CB4 in the outermost circumference. That is, the first two-loop endless coils CA1 to CA4 ( CA ) and the second two-loop endless coils CB1 to CB4 ( CB ) form an endless shaft winding coil of one phase. In addition, in this case, a current input point and a current output point are arranged with respect to a wave winding coil of a phase on the side of the outermost circumference. For example, in a case where a wave winding coil of a phase has a U phase, a current input point Uin and a current output point UN are at the outermost circumference of each slot 3 arranged.

Then, similar to the single-phase wave winding coil of the U-phase whose coil is in 7 1, a V-phase single-phase winding coil and a W-phase single-phase winding coil are arranged adjacent to empty slots so as to be shifted by two slot pitches in the circumferential direction, whereby a three-phase coil can be generated in a single-star circuit. That means it can, as in 8 (b) 1, a coil in which a U-phase single-phase wave winding coil 30U, a V-phase single-phase wave winding coil 30V, and a W-phase single-phase wave winding coil 30W in a single star connection at a neutral point N are generated. In 8 (b) For example, the current input points Uin, Vin, and Win are U-phase, V-phase, and W-phase input points, respectively, and the current output points UN, VN, and WN are U-phase, V-phase, and W-phase neutral point connection points , Since the current input points Uin, Vin and Win and the current output points UN, VN and WN are at an outermost circumference of each slot 3 are arranged, a three-phase coil can be generated only by connecting the current output points UN, VN and WN.

As in 9 are shown in the present embodiment in the coupling between the starting point a7 and the entry point a6, the starting point a5 and the entry point a4, the starting point a3 and the entry point a2 , the starting point b7 and the entry point b6, the starting point b5 and the entry point b4, the starting point b3 and the entry point b2, and the starting point a1 innermost circumference and starting point b1 at the innermost circumference, pine needle-shaped segment conductors 41, 42, 43, 51, 52, 53, and 60U are respectively used. The segment leader 10 Here, at a vertex portion, it is shifted by one layer to a layer on an outer peripheral side while moving in a clockwise direction CW extends over six slot spacings. On the other hand, each of the segment conductors 41, 42, 43, 51, 52 and 53 is displaced by one layer toward an inner peripheral side at a vertex portion while moving in a clockwise direction CW extends over seven slot intervals. Similar to the segment conductor 10 the segment conductors 41, 42, 43, 51, 52 and 53 are bent so as to be in the circumferential direction RT extend, and whose leading ends are welded. Thus, welding on the guide part side 1a for coupling the two-loop endless coils CA1 to CA4 and coupling the second two-loop endless coils CB1 to CB4 becomes unnecessary. As a result, a height of a coil end on the guide part side 1a can be kept low. It should be noted that the current output points UN, VN and WN, which are the neutral point N can be connected by a three-edged segment conductor.

10 FIG. 15 is a perspective view illustrating the stator for a rotary electric machine from the guide part side 1a. FIG. As in 10 is shown at a coil end 5a on the guide part side 1a, the return of the first two-loop endless coil CA and the second two-loop endless coil CB at the innermost circumference in the U-phase through the pine needle-shaped segment conductor 60U. Similarly, coupling is also performed by pine-arced segment conductors 60V and 60W in the V-phase and the W-phase.

Here, the segment conductors 60U, 60V and 60W couple conductors at slot positions separated by six slot spacings. Since the segment conductors 60U, 60V and 60W connect between the layer L1 There is no displacement in the radial direction, and conductors on both sides, their conductors from the layer L1 at the coil end 5a protrude, are in a clockwise direction CW bent. In this arrangement, there is no interference from an adjacent segment conductor. A ladder leading to one side in a clockwise direction CW is folded back at a position in a counterclockwise direction at a position where a next segment conductor is displaced to an outer peripheral side at a pine needle-shaped tip portion.

As in 10 is illustrated in the present embodiment in the coil end 5a On the guide part side 1a, welding is unnecessary, and the current input points Uin, Vin and Win and the current output points UN, VN and WN are arranged in the outermost circumference. Thus, it is possible to have a connection wiring of a neutral point N (Current output point UN) or a wiring to a power source (current input point Uin) on an outer side in the radial direction of the coil end 5a perform and a height of the coil end 5a keep low.

Also, the first two-loop endless coil CA and the second two-loop endless coil CB connected by the shortest segment conductor 60U on the inner peripheral side. The first two-loop endless coils CA1 to CA4 and the second two-loop endless coils CB1 to CB4 are also connected by the shortest segment conductors 41 to 43 and 51 to 53. Thus, a circumference of a coil becomes short and a resistance of the coil can be kept low.

In addition, as in 11 shown, a welding or insulation coating only at one coil end 5b performed on the guide part side 1b opposite side. Thus, a work process becomes easy and the insulation quality can be improved.

When the above-described coupling of the single-phase winding coil of a U-phase 30U is summarized, the coupling of the first two-loop endless coils CA1 to CA4 and the coupling of the second two-loop endless coils CB1 to CB4 in an in 12 performed manner shown. It should be noted that the wave winding coils 30V and 30W are similarly executed. In the single-phase wave winding coil of a U-phase 30U, the first two-loop continuous coils are CA (CA1 to CA4) and the second two-loop endless coils CB (CB1 to CB4) connected in series. The current input point Uin is connected to the input point a8 of the first two-loop endless coil CA4 arranged in the layer L8. The starting point a7 of the first two-loop continuous coil CA4 whose point is located in the layer L7 and the input point a6 of the first two-loop endless coil CA3 whose point is located in the layer L6 are connected to each other through the pine needle-shaped conductor 41 connected. The starting point a5 of the first two-loop endless coil CA3 whose point is located in the layer L5, and the input point a4 of the first two-loop endless coil CA2 whose point is located in the layer L4 are interconnected by the pine needle-shaped segment conductor 42 connected. The starting point a3 of the first two-loop endless coil CA2, whose point is located in the layer L3, and the input point a2 The first two-loop endless coil CA1 whose point is located in the layer L2 is connected to each other through the pine-needle-shaped segment conductor 43. Then the starting point a1 the first two-loop endless coil CA1 whose point in the layer L1 and the starting point b1 of the second two-loop endless coil CB1 whose point is in the layer L1 is interconnected by the pine needle-shaped segment conductor 60U.

The input point b2 of the second two-loop endless coil CB1 disposed in the layer L2 and the starting point b3 of the second two-loop endless coil CB2 disposed in the layer L3 are connected to each other by the pine-branched segment conductor 53. The entry point b4 of the second two-loop endless coil CB2 whose point is located in the layer L5, and the starting point b5 of the second two-loop endless coil CB3 whose point is located in the layer L4 are connected to each other by the pine-needle-shaped segment conductor 52 connected. The input point b6 of the second two-loop endless coil CB3 whose point is located in the layer L6 and the starting point b7 of the second two-loop endless coil CB4 whose point is located in the layer L7 are connected to each other through the pine needle-shaped segment conductor 51 connected. Then, the entry point b8 of the second two-loop endless coil CB4 whose point is located in the layer L8 is connected to the current output point UN.

In the single-phase wave winding coil of a U-phase 30U described above, the first two-loop continuous coils CA1 to CA4 and the second two-loop continuous coils CB1 to CB4 which are eight (eight turns) two-loop endless coils, used. Such as in 13 to 17 can be four turns, six turns, ten Turns, twelve turns and fourteen turns are used in a similar way.

18 Here is a view in which a connection relationship between pine needle-shaped segment conductors for connecting two-loop endless coils in the first two-loop endless coil described above CA and the second two-loop endless coil CB generalized. With regard to the number of turns N ( N indicates the number of layers and the number of turns) N / 2 two-loop endless coil wave windings wound in two adjacent layers in a wave winding are arranged adjacent in the radial direction. With regard to the number of turns N has the first two-loop endless coil CA N / 2 first two-loop endless coils CA1 to CA (N / 2). With regard to the number of turns N has the second two-loop endless coil CB N / 2 second two-loop endless coils CB1 to CB (N / 2). In addition, the first two-loop endless coil CA and the second two-loop endless coil CB arranged so that they differ from each other by six slot spacings.

entry points a2 , a4, ..., a (N-6), a (N-4), a (N-2) and a (N) corresponding to the entry points a2 and the like of the first two-loop endless coil CA are in layers ( N - 2m), ( N - 2 (m - 1)), ..., ( N - 6), ( N -4), ( N - 2 ) and ( N ) and arranged on straight lines extending radially from the central axis AX. starting points a1 , a3, ..., a (N-7), a (N-5), a (N-3) and a (N-1) corresponding to the starting point a1 and the like of the first two-loop endless coil CA are in layers ( N - (2m + 1)), ( N - (2m - 1)), ..., ( N - 7), ( N - 5), ( N - 3 ) and ( N - 1 ) and arranged on the straight lines extending radially from the central axis AX. Note that m is an integer equal to or greater than 1 and N is N = 2m + 2.

Then in the first two-loop endless coil CA the starting point a (N-1) in the layer ( N - 1 ) and the entry point a (N-2) in the layer ( N - 2 ), the starting point a (N-3) in the layer ( N - 3 ) and the entry point a (N-4) in the layer ( N - 4), the starting point a (N - 5) in the layer ( N 5) and the entry point a (N-6) in the layer (FIG. N - 6), ..., and the starting point a (N - (2m - 1)) = a3 in the layer ( N - (2m - 1)) and the entry point a (N - 2m) = a2 in the layer ( N - 2m) in each case connected by pine needle-shaped segment conductors.

Similarly, the entry points b2, b4, ..., b (N-6), b (N-4), b (N-2), and b (N) corresponding to the entry point b2 and the like of the second two loops are the same -Endlosspule CB in the layers ( N - 2m), ( N -2 (m - 1)), ..., ( N - 6), ( N - 4), ( N - 2 ) and ( N ), and are arranged on the straight lines extending radially from the center axis AX. Starting points b1, b3, ..., b (N-7), b (N-5), b (N-3) and b (N-1) corresponding to the starting point b1 and the like of the second two-loop endless coil CB are in the layers ( N - (2m + 1)), ( N - (2m - 1)), ..., ( N -7), ( N - 5), ( N - 3 ) and ( N - 1 ), and are arranged on the straight lines extending radially from the center axis AX.

Then in the second two-loop endless coil CB the starting point b (N-1) in the layer ( N - 1 ) and the entry point b (N-2) in the layer ( N - 2 ), the starting point b (N-3) in the layer ( N - 3 ) and the entry point b (N-4) in the layer ( N - 4), the starting point b (N - 5) in the layer ( N 5) and the entry point b (N-6) in the layer (FIG. N - 6), ..., and the starting point b (N - (2m - 1)) = b3 in the layer ( N - (2m - 1)) and the entry point b (N - 2m) = b2 in the layer ( N - 2m) are interconnected by pine-tree-shaped segment conductors.

That is, with m as an integer equal to or greater than 1 and the number of turns N in the radial direction as N = 2m + 2 the starting point is a (N - (2m - 1)) in the layer ( N - (2m - 1)) at a position of the number of turns ( N - (2m - 1)) and the entry point a (N - 2m) in the layer ( N - 2m) at a position of the number of turns ( N - 2m) are through a pine-needle-shaped segment conductor in the first two-loop endless coil CA connected with each other. Also in the second two-loop endless coil CB is the starting point b (N - (2m - 1)) in the layer ( N - (2m - 1)), ie a position of the number of turns ( N - (2m - 1)) and the entry point b (N - 2m) in the layer ( N - 2m), ie a position of the number of turns ( N - 2m), are connected by a pine needle-shaped segment conductor. Then, the starting point is a (N - (2m + 1)) of the first two-loop endless coil CA and the starting point b (N- (2m + 1)) of the second two-loop endless coil CB whose points in the layer ( N - (2m + 1)), ie a position of the number of turns ( N - (2m + 1)) are interconnected by a pine needle shaped segment conductor.

In any case, the starting point a1 the first two-loop endless coil CA and the starting point b1 of the second two-loop endless coil CB at the innermost circumference, and the current input point Uin and the current output point UN are arranged at the outermost circumference.

It should be noted that in the present embodiment, as in 19 shown the slots 3 a semi-closed slot shape with flange portions which extend in the circumferential direction from the front ends of the teeth 2 extend out. With this arrangement, a magnetic flux loss on an inner peripheral surface of the stator core 1 be counteracted. Even in a case of an open slot shape without a flange part, it is necessary to fit on a leading end part of a tooth 2 to provide a notch to a wedge on the innermost peripheral side of a slot 3 to keep. However, in a case of the half-closed slot shape, it is not necessary to provide a notch because a key is stuck with a flange part.

In addition, in the embodiment described above, the 48 annular slots 3 formed, the number of poles of the rotor is eight and the first two-loop endless coil CA and the second two-loop endless coil CB are formed so that they are shifted by six slot intervals from each other. However, in a case where the number of slots is Ns and the number of poles of a rotor is Np, a first two-loop endless coil must be used CA and a second two-loop endless coil CB generally only shifted from each other by (Ns / Np) slot spacings.

LIST OF REFERENCE NUMBERS

2 1

STATORKERN ZAHN

3

SLOT

1A

GUIDE PART PAGE

1B

PAGE THAT FACES THE GUIDE PART

5a, 5b

COIL END

10

21, 21a, 21b, 22 to 28, 41 to 43, 51 to 53, 60U, 60V,

60W

SEGMENT LADDER

23t,

27t PIECE PIECE

a1,

a3, a5, a7, a9, a11, a13, b1, b3, b5, b7, b9, b11, b13 STARTING POINT

a2,

a4, a6, a8, a10, a12, a14, b2, b4, b6, b8, b10, b12,

b14

INPUT POINT

CA,

CA1 TO CA4 FIRST TWO-GRINDING END SPOOL

CB,

CB1 TO CB4 SECOND TWO-LOOP END SPOOL

CW

DIRECTION IN CLOCKWISE

EA,

EB CONNECTED AREA

L1

UP TO L14 LAYER

N

STAR POINT

RT

SCOPE DIRECTION

RCA,

RCB RADIAL DIRECTION

T21

UP TO T28 WELDED PART

Claims (7)

A winding structure of a stator for a rotary electric machine, in the stator of which a wave winding of a coil having a predetermined slot pitch with respect to a stator core having a plurality of teeth and a plurality of slots formed alternately and annularly in a circumferential direction is performed; wherein a plurality of two-layer wave winding coils are arranged in a radial direction and each of the two-layer wave winding coils has a first two-loop endless coil in which an entry point and a departure point are formed on a guide part side, and a wave winding of two loops of a coil in the predetermined one Slot pitch is performed in two columns in the circumferential direction, and a second two-loop endless coil, which has a same configuration as the first two-loop endless coil, and which is arranged so that they from the first two-loop endless coil deviates the predetermined slot pitch in the circumferential direction, and wherein the input point and the starting point of the first two-loop endless coil are arranged in the same radial direction and the input point and the starting point of the second two-loop endless coil are arranged in the same radial direction, and wherein a starting point of the first two-loop endless coil on an outer peripheral side and an input point of the first two-loop endless coil on an inner peripheral side are connected in series and the points are adjacent to each other in the radial direction, with a starting point of the second two-loop An endless coil on the outer peripheral side and an input point of the second two-loop endless coil on the inner peripheral side are connected in series and the points in the radial direction adjacent to each other, wherein a starting point of the first two-loop endless coil in an innermost circumference and a starting point of the second two-loop endless coil in the innermost circumference, wherein an input point of the first two-loop endless coil at an outermost circumference is a current input point of a single-phase coil, and an input point of the second two-loop endless coil at the outermost circumference Current output point of the single-phase coil is. Winding structure of a stator for a rotating electric machine Claim 1 . wherein in the first two-loop endless coil and the second two-loop endless coil, a pine needle-shaped segment conductor is inserted into the slots from the guide part side, and wherein an end part of the segment conductor is welded on a side opposite to the guide part side, and wherein coupling of the segment conductor Starting point of the first two-loop endless coil on the outer peripheral side and the input point of the first two-loop endless coil on the inner peripheral side, wherein the points are adjacent to each other in the radial direction, coupling the output point of the second two-loop endless coil on the outer peripheral side and the input point of the second two-loop endless coil on the inner peripheral side, the dots being adjacent in the radial direction, and coupling the output point of the first two-loop endless coil in the innermost periphery and the output point of the second two-loop endless coil in the innermost Circumference through a pine needle-shaped segment conductor, which has a slot insertion part, are interconnected. Winding structure of a stator for a rotating electric machine Claim 1 or Claim 2 in which, with m as an integer equal to or greater than 1 and with the number of turns N in the radial direction N = 2m + 2, a starting point at a position of the number of turns (N - (2m - 1)) and an entry point at a position of the number of turns (N-2m) in a plurality of first two-loop endless coils is connected to each other through a pine-needle-shaped segment conductor having a slot insertion part, and a starting point at a position of the number of turns (FIG. N - (2m - 1)) and an entry point at a position of the number of turns (N - 2m) in a plurality of second two-loop endless coils are interconnected by a pine-needle-shaped segment conductor having a slot insertion part. Winding structure of a stator for a rotating electrical machine according to one of Claims 1 to 3 wherein the first two-loop endless coil and the second two-loop endless coil are wound so as to intersect each other in the radial direction at the predetermined slot pitch. Winding structure of a stator for a rotating electrical machine according to one of Claims 1 to 4 wherein three single-phase coils are arranged adjacent in the circumferential direction, and wherein a single star connection is made with a current input point of each of the single-phase coils which is a feeding point of each phase and a current output point of each of the single-phase coils which is a neutral point connection point. Winding structure of a stator for a rotating electrical machine according to one of Claims 1 to 5 wherein the predetermined slot spacing is a value corresponding to the number of slots divided by the number of poles of a rotor. Winding structure of a stator for a rotating electrical machine according to one of Claims 1 to 5 wherein the slots have a semi-closed slot shape.

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