JP2024056281A - Rotating electric machine armature and rotating electric machine - Google Patents

Abstract

[Problem] To provide an armature for a rotating electric machine that is inexpensive and can simplify production facilities. [Solution] An armature winding 55 includes a plurality of winding groups 55G each formed by connecting a plurality of unit coils 40, each of which is housed in slots 51S spaced apart by an electrical angle of 180 degrees in the circumferential direction and has a pair of legs 41 displaced in the radial direction and a connecting portion 42 connecting one axial end of the legs 41 to each other, and each winding group 55G is wave-wound from the radial inside to the radial outside of an armature core 51, with a first end disposed on one side, either the radial inside or the radial outside, and a second end disposed on the other radial side, forming n winding layers in the radial direction, and assuming that the number of pole slots per phase is K, 2K winding groups are disposed per phase in n/2 winding layers in the radial direction, and the second ends are connected to each other in each phase to form a series winding group 55GS, which is then connected in parallel. [Selected Figure] Figure 1

Description

This application relates to an armature for a rotating electric machine and a rotating electric machine.

Miniaturization is especially required for rotating electrical machines such as automobile motors and generators that are installed in small spaces. Also, to accommodate the increased current of the system, many rotating electrical machines use stator coils in which the coils are connected in parallel for each phase. A rotating electrical machine stator with the following configuration has been disclosed that achieves miniaturization while ensuring the number of coils connected in parallel to accommodate the increased current.

That is, in the stator of a conventional rotating electric machine, the wire has a turn portion that connects the slot-receiving portions arranged in different slots, and the stator winding is formed by wave-winding it around the stator core. The wire arranged at the positions of slots (14) and (15) is connected in succession to form multiple groups. The wire in each group forms a stator winding connected in parallel by continuous wire (see, for example, Patent Document 1).

JP 2009-11148 A (paragraphs [0026] to [0028], Figs. 8 and 9)

In the stator of a conventional rotating electric machine as described above, the stator windings of the multiple groups wired in a wave winding are connected to each other by interweaving a continuous wire material different from the wire material constituting the stator winding, and the stator windings are connected in parallel to achieve a large current and a small size. However, the pitch between the slot-received parts of the wire material used to achieve the parallel connection of the stator windings is different from the pitch between the slot-received parts of the wire material constituting the stator winding. Since wire materials with different structures are used in this way, there are problems in that the number of types of wire material increases, production facilities increase, and there are concerns about increased costs and complicated management.
The present application discloses a technique for solving the above-mentioned problems, and has an object to provide an armature for a rotating electric machine and a rotating electric machine which are inexpensive and can be produced using simplified production facilities.

The armature of a rotating electric machine disclosed in the present application comprises:
an armature core having a plurality of teeth arranged in an annular shape at set intervals and protruding radially inward; and a multi-phase armature winding housed in a plurality of slots formed between adjacent teeth,
In an armature of a rotating electric machine, the number of slots per pole per phase obtained by dividing the total number of slots by the number of phases and the number of magnetic poles of a rotor having a plurality of magnetic poles is an integer K of 2 or more,
The armature winding is
a plurality of winding groups each formed by connecting a plurality of unit coils, each unit coil being housed in the slot spaced circumferentially by an electrical angle of 180 degrees, the unit coil having a pair of legs whose radial positions within the slot are displaced from each other, and a connecting portion connecting one ends of the pair of legs together in the axial direction,
each of the winding groups is wave-wound from the radially inner side to the radially outer side of the armature core, with a first end of the winding group being disposed on one side of the radially inner side or the radially outer side of the armature core, and a second end being disposed on the other radial side;
In each of the slots, n pieces (n is an even number) of the legs of the unit coils are arranged in a row in the radial direction and accommodated, forming n winding layers in the radial direction. If n/2 winding layers are defined in the radial direction, then 2K pieces of the winding group are arranged for each phase in each of the n/2 winding layers,
In each phase, the second ends of the winding groups are connected to each other to form a series winding group, and the series winding groups are connected in parallel.
It is something.
Further, the rotating electric machine disclosed in the present application is
The armature of the rotating electric machine configured as above is used as a stator,
a rotor disposed coaxially with the stator so as to face the stator;
It is something.

The rotating electric machine armature and rotating electric machine disclosed in this application can provide a rotating electric machine armature and rotating electric machine that are inexpensive and can simplify production equipment.

1 is a cross-sectional schematic diagram showing a schematic configuration of a rotating electric machine according to a first embodiment; 1 is a perspective view showing a schematic configuration of a stator of a rotating electric machine according to a first embodiment; 1 is a partial perspective view showing a schematic configuration of a stator of a rotating electric machine according to a first embodiment; 2 is a perspective view showing each unit coil constituting the coil of the rotating electric machine according to the first embodiment; FIG. 2 is a schematic cross-sectional view perpendicular to the axial direction of the stator according to the first embodiment; FIG. 6A and 6B are wiring diagrams of the coil according to the first embodiment. FIG. 2 is a wiring diagram of a coil according to the first embodiment. FIG. 11 is a wiring diagram showing another configuration of the coil according to the first embodiment. 1 is a perspective view showing a schematic configuration of a stator of a rotating electric machine according to a first embodiment;

Embodiment 1.
The armature of a rotating electric machine and the rotating electric machine according to the present embodiment 1 will be described below with reference to the drawings. In this specification, the terms "circumferential direction", "radial direction", "axial direction", "inner direction", and "outer direction" refer to the "circumferential direction", "radial direction", "axial direction", "inner direction", and "outer direction" of the armature of the rotating electric machine.

FIG. 1 is a schematic cross-sectional view showing a general configuration of a rotating electrical machine 100 according to a first embodiment.
The rotating electric machine 100 includes a cylindrical housing 70 , a stator 50 as an armature accommodated therein, and a rotor 60 disposed opposite the stator 50 .
The housing 70 has a cylindrical frame 71 with a bottom, and an end plate 72 that closes the opening of the frame 71 .
The stator 50 is fixed to the frame 71 in a fitted state on the radially inner side X1 of the frame 71 .
The rotor 60 is rotatably supported on the radially inner side X1 of the stator 50 by a rotating shaft 74 provided via a bearing 73 in the center of an end plate 72 of the frame 71 .

The rotor 60 is a permanent magnet type rotor including a rotor core 61 fixed to a rotating shaft 74, and a plurality of permanent magnets 62 that are provided on the rotor core 61 and form magnetic poles. The permanent magnets 62 are embedded in the outer circumferential surface of the rotor core 61 at set intervals in the circumferential direction C.
The rotor 60 is not limited to a permanent magnet type rotor, but may be a squirrel-cage rotor in which uninsulated rotor conductors are housed in the slots of the rotor core and both sides in the axial direction Y are short-circuited by short-circuit rings, or a wound rotor in which insulated conductor wires are fitted in the slots of the rotor core, etc.

FIG. 2 is a perspective view showing a schematic configuration of a stator 50 of the rotating electric machine 100 according to the first embodiment.
FIG. 3 is a perspective view taken along the line AA in FIG.
The stator 50 has a stator core 51 as an armature core formed by stacking a plurality of electromagnetic steel plates in the axial direction Y, and multiple-phase coils 55 as an armature winding wound around this stator core 51.

The stator core 51 has a plurality of teeth portions 51T arranged in a ring shape at a set interval in the circumferential direction C and protruding radially inward X1, and an annular yoke portion 51Y connecting the radially outward X2 of these teeth portions 51T.
A groove-shaped slot 51S is formed between each pair of adjacent teeth 51T, and a coil 55 is housed in the slot 51S.

In this embodiment, the total number S of slots 51S is 96, the number of magnetic poles M of the rotor 60 is 8, and the number of phases is 3. The number K of slots per pole per phase obtained by dividing the total number S of slots by the number of phases 3 and the number of magnetic poles M is 4. In this embodiment, the number K of slots per pole per phase is configured to be an integer of 2 or more.

The coil 55 has a joint 46 as a transition portion on the radially outer side X2, which extends in the circumferential direction C. The configurations of the joint 46 and the coil 55 will be described below.
FIG. 4 is a perspective view showing unit coils 40I, 40J, and 40K constituting coil 55 according to the first embodiment.
FIG. 5 is a schematic cross-sectional view of the stator 50 according to the first embodiment, taken along a line perpendicular to the axial direction Y. As shown in FIG.

The coil 55 of the present embodiment is configured to have a plurality of three types of U-shaped unit coils 40I, 40J, and 40K as shown in Fig. 4. In the following description, when there is no need to distinguish between the three types of unit coils 40I, 40J, and 40K, they will be referred to as unit coils 40.
The unit coil 40 is formed by shaping a flat rectangular conductor wire cut to a set length, and has a pair of slot accommodating portions 41 as legs that are accommodated in the slot 51S, and a coil end portion 42 as a connecting portion that connects one end of the pair of slot accommodating portions 41 in the axial direction Y.

The other end of the slot accommodating portion 41 in the axial direction Y is provided with a bent portion 43 as a protruding portion protruding from within the slot 51S, and a connecting portion 44 as a protruding portion.
The bent portion 43 is a portion that is bent in the circumferential direction C at the axial end face of the stator core 51. The connection portion 44 is a portion that extends from the bent portion 43 in the axial direction Y. The connection portion 44 is electrically connected to the connection portion 44 of another unit coil 40, a power supply portion P connected to a power source, a neutral point N, or a joint 46, as will be described in detail later. For convenience, the connection portion 44 that is connected to the power supply portion P or the neutral point N is indicated as 44PN, and the connection portion that is connected to the joint 46 is indicated as 44J.

Further, the interval between the pair of slot-receiving portions 41 is adjusted so that the pair of slot-receiving portions 41 of each unit coil 40 are respectively received in slots 51S that are spaced apart from each other in the circumferential direction C by 180 electrical degrees.
In addition, the coil end portion 42 is formed with a crank portion 42C that is bent so as to displace the radial positions of the pair of slot accommodating portions 41 relative to each other within the slot 51S when each of the slot accommodating portions 41 is accommodated within the slot 51S.

Of these three types of unit coils 40I, 40J, and 40K, the unit coil 40K is disposed on the radial outside X2 of the stator core 51, and the unit coils 40I and 40J are disposed on the radial inside X1 of the stator core 51. Therefore, the interval between the slot-accommodated portions 41 of the unit coil 40K disposed on the radial outside X2 is configured to be larger than the interval between the slot-accommodated portions 41 of the unit coils 40I and 40J.
Furthermore, among the unit coils 40I, 40J arranged on the radially inner side X1, the connection portion 44PN of the unit coil 40I is configured to be longer than the other connection portions 44 so that it can be connected to a power supply point P or a neutral point N connected to a power source.

As described above, in this embodiment, the stator 50 has 8 poles and a slot number S of 96, with the number of slots per pole per phase K being 4. As shown in the schematic cross-sectional view of the stator 50 in FIG. 5, in one slot 51S, the slot accommodation portions 41 of each unit coil 40 are accommodated in a row in the radial direction X, forming four winding layers in the radial direction X.

Here, the number of winding layers in the slot 51S, n, divided by 2, is defined as n/2 winding layers in the radial direction X. That is, the slot-accommodated portions 41 accommodated in a row in the radial direction X in the slot 51S are numbered 1, 2, 3, and 4 from the radial inside X1 to the radial outside X2. In this case, the layers of the first and second wires can be defined as the first winding layer A, and the layers of the third and fourth wires as the second winding layer B. These n/2 winding layers A and B arranged in the radial direction X will be used in the following explanation.

The connection method of the unit coils 40 constituting the coil 55 will be described below.
As described above, there are three types of unit coils 40I, 40J, and 40K as unit coils 40, but the positions at which these are arranged on the stator core 51 differ depending on the position in the radial direction X on the stator core 51, or the connection configuration to the power supply part P and the neutral point N. However, for the sake of simplicity, in the following description, they will not be distinguished from one another and will be described as unit coils 40.

6A and 6B are connection diagrams of the coil 55 according to the first embodiment.
To simplify the drawing, only the slots 51S that house the coils in the U layer and the coils 55 in the U layer are shown among the U layer, V layer, and W layer. In this drawing, the slots 51S are given the symbols U1 to U32 to distinguish them from one another.
FIG. 7 is a wiring diagram of the coil 55 according to the first embodiment.
For simplicity of illustration, only the coils 55 in the U layer are shown.

The pair of slot-accommodating portions 41 of the unit coil 40 are displaced by one layer in the radial direction X by the crank portion 42C, and the slot-accommodating portions 41 are each accommodated in a slot 51S that is 180 electrical degrees apart.

That is, as shown in Figure 6A, in layer A on the radially inner side X1, a unit coil 40 having one slot-accommodated portion 41 accommodated in the first layer (No. 1) of slot U1 has the other slot-accommodated portion 41 accommodated in the second layer (No. 2) of slot U5.
Similarly, a unit coil 40 having one slot accommodation portion 41 accommodated in the first layer (No. 1) of slot U9 has the other slot accommodation portion 41 accommodated in the second layer (No. 2) of slot U13 (not shown).
Similarly, a unit coil 40 having one slot-received portion 41 received in the first layer (No. 1) of slot U25 has the other slot-received portion 41 received in the second layer (No. 2) of slot U29.

Similarly, in layer B on the radially outer side X2, the slot accommodation portions 41 of each unit coil 40 are accommodated in slots 51S spaced apart by 180 electrical degrees. To make the drawing easier to understand, the unit coils 40 arranged in layer B are shown by dotted lines.

Then, the connecting portions 44 provided on the tip sides of the bent portions 43 extending from the slots 51S of adjacent unit coils 40 are connected to each other. In this manner, the unit coils 40 are connected in sequence in the circumferential direction C to form one winding group 55G.
In order to simplify the drawing, the connection portion 44 is indicated by a circle.
In order to facilitate understanding of the connection relationship, the left and right ends of the winding group 55G in FIG. 6A are labeled D1, D2, D3, and D4.

In layer A, the winding group 55G is formed by sequentially connecting multiple unit coils 40 to go around the stator core 51 in the circumferential direction C. The connection portion 44 extending from the second layer (No. 2) of slot U29 is connected to the connection portion 44 extending from the third layer (No. 3) of slot U1 in layer B, so that the winding group 55G is displaced radially outward X2 from layer A to layer B. In this way, the winding group 55G is wound in a wave winding method by going around the stator core 51 in the circumferential direction C by two mechanical angles, from the radially inner side X1 to the radially outer side X2 of the stator core 51.

The wound winding group 55G has a connection part 44PN (first end) at one end extending from the first layer (No. 1) of slot U1 on the radial inside X1 of the stator core 51, and a connection part 44J (second end) at the other end extending from the fourth layer (No. 4) of slot U29 on the radial outside X2.

The U layer is made up of a plurality of winding groups 55G. These winding groups 55G are each housed in the slots 51S in a continuous manner in the circumferential direction C. Although not shown in FIG. 6A, the other three winding groups 55G making up the U layer are also arranged in the same manner as above, with their connection parts 44PN (first ends) extending from the first layer (No. 1) of slots U2, U3, and U4, and their connection parts 44J (second ends) at the other ends extending from the fourth layer (No. 4) of slots U30, 31, and 32.

Here, the first layer (No. 1) of the slots U5, U6, U7, and U8 is an empty area, and four winding groups 55G are arranged therein so that, as shown in FIG. 6B, connection portion 44PN (first end portion) at one end extends from the first layer (No. 1) of the slots U5, U6, U7, and U8, and connection portion 44J (second end portion) at the other end extends from the fourth layer (No. 4) of the slots U1, U2, U3, and U4.
Also in FIG. 6B, to facilitate understanding of the connection relationship, the left and right ends of the winding group 55G in FIG. 6B are labeled D7, D8, D9, and D10.

Therefore, in the stator 50 of this embodiment, a total of eight (=2×K) winding groups 55G are arranged, including four winding groups 55G that make two revolutions around the stator core 51 and four winding groups 55G that are housed in slots that are 180 degrees apart in electrical angle from the winding groups 55G. Focusing on each of the winding layers A and B, each of the winding layers A and B has eight (=2×K) winding groups 55G that make one revolution around the stator core 51 in mechanical angle.

Here, the four winding groups 55G in the U layer whose connection parts 44J (second ends) extend from the fourth layer (No. 4) of slots U29, U30, U31, and U32 are defined as the in-phase winding group G1 of the U phase. Also, the winding group 55G in the U layer whose connection parts 44J (second ends) extend from the fourth layer (No. 4) of slots U1, U2, U3, and U4 are defined as the in-phase winding group G2 of the U phase.

As shown in FIG. 7, the connection portions 44J of the in-phase winding groups G1 and G2 are connected by joints 46.
More specifically, between the in-phase winding groups G1 and G2, a connection portion 44J of the in-phase winding group G1 and a connection portion 44J of the in-phase winding group G2, which are located symmetrically in the circumferential direction C with respect to a first wire F1 extending radially through the circumferential center between the in-phase winding groups G1 and G2, are each connected by a joint 46.

There are four joints 46, the same number as the number of slots per pole and phase, K. When the slot pitch is t, the number of poles is M, and the total number of slots is S, the length L of the joints in the circumferential direction C is X×t (where S/M-(K-1)≦X≦S/M+(K-1)).
In this embodiment, the joints 46 have lengths L in the circumferential direction C of 15×t, 13×t, 11×t, and 9×t, respectively.

In this way, the four winding groups 55G constituting the in-phase winding group G1 and the four winding groups 55G constituting the in-phase winding group G2 are connected in series by the joints 46 on the radial outside X2 of the stator core 51, forming four series winding groups 55GS (GS1, GS2, GS3, GS4).

In the four U-phase series winding groups 55GS, the connection parts 44PN of the winding groups 55G that constituted the in-phase winding group G1 are connected to the power supply P. Also, the connection parts 44PN of the winding groups 55G that constituted the in-phase winding group G2 are connected to the neutral point N. As a result, in the U-phase, the four series winding groups 55GS (GS1, GS2, GS3, GS4) are connected in parallel between the power supply P and the neutral point N.

By connecting the unit coils 40 in the same manner for the V and W phases, the series winding groups 55GS constituting the U, V, and W phases are connected in parallel in each phase, forming a three-phase Y connection.

As shown in FIG. 3 , the joint 46 is arranged adjacent to each winding group 55G on the radially outer side X2, and is composed of a U-shaped connecting conductor having a portion extending in the circumferential direction C and a portion extending in the axial direction Y at both ends of the circumferential direction C and connected to each connecting portion 44.
3 shows connection parts 44PN connected to the power supply parts P of the U, V, and W phases, and connection part 44PN connected to the neutral point N. In this manner, a plurality of connection parts 44PN connected to the power supply parts P or the neutral point N are arranged in one location for each phase.

As described above, among the unit coils 40I and 40J arranged on the radially inner side X1, the connection part 44PN of the unit coil 40I is configured to be longer than the other connection parts 44 so that it can be connected to the power supply part P or the neutral point N connected to the power source, and therefore protrudes in the axial direction Y further than the other connection parts 44. This allows the connection part 44PN to be connected to the power supply part P or the neutral point N without interfering with the other connection parts 44.

The reason why the connection portion 44PN connected to the power supply portion P and the neutral point N is disposed on the radially inner side X1 of the stator 50 is that the space on the radially outer side X2 of the stator core 51 can be narrow in an electric motor for driving an automobile or generating electricity. Therefore, by simplifying the structure on the radially outer side X2 of the stator core 51 and configuring the complicated connection structure on the radially inner side X1, ease of mounting on the vehicle body is ensured.
However, even if the connection portion 44PN is disposed on the radially outer side X2 and power is supplied from the radially outer side X2, the effect of this embodiment described later can be obtained.

A stator 50A having a different configuration from the stator 50 described above will be described below.
FIG. 8 is a wiring diagram showing another configuration of the coil 55 according to the first embodiment.
In the above-described stator 50, eight winding groups 55G (=2×K) making one revolution around the stator core 51 are arranged in each of the winding layers A and B. However, as shown in Fig. 8, the number of slots S may be 72, the number of poles is 8, and the number of slots per pole per phase K=3, and six winding groups 55G (=2×K) making one revolution around the stator core 51 may be arranged in each of the winding layers A and B.

In this case, since the number of winding wires in the winding group 55G inserted into the slot 51S is six, the number of layers is n/2, i.e., 6/2=3, and three winding layers A, B, and C are configured in the radial direction X. In addition, in the stator 50A, the joint 46 is disposed on the radially inner side X1, and the power supply point P and the neutral point N are disposed on the radially outer side X2. Thus, in the stator 50A, the connection portion 44PN (first end portion) at one end of the stator core 51 extends from the slot 51S on the radially outer side X2, and the connection portion 44J (second end portion) at the other end extends from the slot 51S on the radially inner side X1. In this way, the winding group 55G is wave-wound while displacing from the winding layer C on the radially outermost side X2 to B to A toward the radially inner side X1.
The connection portions 44J (second ends) are connected on the radially inner side X1 by three joints 46, each of which has a length L in the circumferential direction C of 11×t, 9×t, and 7×t.

A stator 50B having a different configuration from the above-described stator 50 will be described below.
FIG. 9 is a perspective view showing a schematic configuration of a stator 50B of a rotating electric machine according to the first embodiment.
The unit coils 40 are connected in the same manner as the stators 50, 50A described above, but the positions of the three-phase power supply parts P are disposed at mechanical angles of about 120±10 degrees between each phase.
With this configuration, the power supply parts where the voltage is relatively high can be separated from each other, and the insulation capacity required for the coil ends can be reduced. Therefore, the thickness of the insulating coating applied to the winding of the coil 55 can be reduced, and a low-cost stator can be obtained.

The armature of the rotating electric machine according to the present embodiment configured as described above has:
an armature core having a plurality of teeth arranged in an annular shape at set intervals and protruding radially inward; and a multi-phase armature winding housed in a plurality of slots formed between adjacent teeth,
In an armature of a rotating electric machine, the number of slots per pole per phase obtained by dividing the total number of slots by the number of phases and the number of magnetic poles of a rotor having a plurality of magnetic poles is an integer K of 2 or more,
The armature winding is
a plurality of winding groups each formed by connecting a plurality of unit coils, each unit coil being housed in the slot spaced circumferentially by an electrical angle of 180 degrees, the unit coil having a pair of legs whose radial positions within the slot are displaced from each other, and a connecting portion connecting one ends of the pair of legs together in the axial direction,
each of the winding groups is wave-wound from the radially inner side to the radially outer side of the armature core, with a first end of the winding group being disposed on one side of the radially inner side or the radially outer side of the armature core, and a second end being disposed on the other radial side;
In each of the slots, n pieces (n is an even number) of the legs of the unit coils are arranged in a row in the radial direction and accommodated, forming n winding layers in the radial direction. If n/2 winding layers are defined in the radial direction, then 2K pieces of the winding group are arranged for each phase in each of the n/2 winding layers,
In each phase, the second ends of the winding groups are connected to each other to form a series winding group, and the series winding groups are connected in parallel.
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In this way, the armature winding, which is a coil of the stator, includes a plurality of winding groups each formed by connecting a plurality of unit coils, each unit coil having a pair of legs that are respectively accommodated in slots that are 180 electrical degrees apart and a connecting portion that connects one axial end of the pair of legs together. Since this winding group is wave-wound from the radial inside to the radial outside of the armature core, a first end is disposed on one side of the radial inside or radial outside, and a second end is disposed on the other radial side.
The winding group is configured so that 2K wires are arranged for each phase in n/2 winding layers arranged in the radial direction X. The pair of legs of the unit coil are configured so that their radial positions within the slot are displaced from each other. This makes it possible to form a winding group extending from the radial inside to the radial outside without the need to use a separate wire material with a different configuration from the unit coils that make up the winding group. This makes it possible to minimize the types of unit coils used and also avoids the increase in costs and complication of management that would result from an increase in the types of wire material and an increase in production facilities.
Furthermore, by connecting the series winding groups in each phase, in which the second ends of the winding groups are connected to each other, in parallel, it becomes possible to handle a large current.

In the armature of the rotating electric machine according to the present embodiment configured as described above,
The winding groups are respectively housed in the slots successively in the circumferential direction for each phase, and a plurality of the winding groups of the same phase that are successive in the circumferential direction are defined as a same-phase winding group.
Between the in-phase winding groups, the second ends located at positions circumferentially symmetrical with respect to a first wire extending radially through a circumferential center between the in-phase winding groups are connected to each other by a jumper portion to form the series winding group.
It is something.

In this way, the winding groups are housed in the slots successively in the circumferential direction for each of the phases U, V, and W. The in-phase winding groups of the same phase housed successively in the circumferential direction form a series winding group by connecting, by a jumper portion, second ends of the in-phase winding groups that are located in circumferentially symmetrical positions with respect to the first wire that extends radially through the circumferential center between the in-phase winding groups.
In this way, by forming a series winding group by connecting the second ends of the first wires at positions symmetrical to each other, it is possible to cancel the phase difference in electromotive force between the symmetrical winding groups. Thus, in a parallel circuit in which series winding groups formed by aligning the phase of each winding group with the center of the magnetic pole are connected in parallel, it is possible to suppress circulating current caused by the phase difference.

Furthermore, by forming a series winding group by connecting the second ends of the winding groups that are symmetrical to the first wire, the first ends of the multiple series winding groups that form the in-phase winding group are arranged in one place on the radially inner side or the radially outer side. In other words, since the first ends that are connected to the neutral point or the power supply unit are gathered in one place, parallel connection can be made without complex wiring. In this way, the wiring plate that forms the power supply unit does not become larger, and the wiring coil does not become longer.

In the armature of the rotating electric machine according to the present embodiment configured as described above,
The circumferential spacing between the slots is t,
The total number of the slots of the armature core is S,
If the number of magnetic poles of the rotor is M,
The circumferential length L of the transition portion in each phase is
L = X × t
However, S/M-(K-1)≦X≦S/M+(K-1)
It is composed of
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By configuring the length of the transition section as described above, the second ends of the winding groups located at circumferentially symmetrical positions can be reliably connected to form a series winding group. In this way, circulating current caused by phase difference can be reliably suppressed, providing a high-performance rotating electric machine with suppressed torque ripple.

In the armature of the rotating electric machine according to the present embodiment configured as described above,
Each of the unit coils has a protrusion protruding from the slot at the other axial end of the leg,
the unit coil constituting the first end of the winding group is configured so that the length of the protruding portion constituting the first end is longer than the length of the protruding portion of the other unit coils constituting the winding group.
It is something.

This makes it possible to prevent the first end connected to the power supply or neutral point from interfering with the connection of other coils. This allows parallel wiring without complex wiring, and also makes it possible to prevent the first end connected to the high-potential power supply from interfering with the connection of other unit coils.

In the armature of the rotating electric machine according to the present embodiment configured as described above,
The number of slots per pole per phase K is 3 or more,
The number of the series winding groups connected in parallel in each phase is configured to be the same as the number of slots K per pole per phase.
It is something.
In this way, in a stator having a large number of series winding groups, such that the number of slots per pole per phase K is 3 or more, it is possible to simplify the connections which become more complicated as the number of series winding groups increases.

In the armature of the rotating electric machine according to the present embodiment configured as described above,
the first end of the winding group is provided radially inward of the armature core;
It is something.
In this manner, by disposing the first end portion on the radial inside rather than the radial outside of the armature core which has dimensional constraints, it is possible to provide a stator and a rotating electric machine which are easy to mount.

In the armature of the rotating electric machine according to the present embodiment configured as described above,
The first ends of the phases are arranged at intervals of 120 degrees ± 10 degrees in mechanical angle between the phases.
It is something.
In this way, by arranging the first ends connected to the high potential power supply parts at locations offset by approximately 120 degrees in mechanical angle, the high potential power supply parts can be physically separated from each other, and the insulating portion of the coil end part of coil 55 can be made thin.

Although exemplary embodiments are described herein, the various features, aspects, and functions described in the embodiments are not limited to application to a particular embodiment, but may be applied to the embodiments alone or in various combinations.
Therefore, countless modifications not illustrated are expected within the scope of the technology disclosed in this application, including, for example, modifying, adding, or omitting at least one component.

Various aspects of this disclosure are summarized below as appendices.

(Appendix 1)
an armature core having a plurality of teeth arranged in an annular shape at set intervals and protruding radially inward; and a multi-phase armature winding housed in a plurality of slots formed between adjacent teeth,
In an armature of a rotating electric machine, the number of slots per pole per phase obtained by dividing the total number of slots by the number of phases and the number of magnetic poles of a rotor having a plurality of magnetic poles is an integer K of 2 or more,
The armature winding is
a plurality of winding groups each formed by connecting a plurality of unit coils, each unit coil being housed in the slot spaced circumferentially by an electrical angle of 180 degrees, the unit coil having a pair of legs whose radial positions within the slot are displaced from each other, and a connecting portion connecting one ends of the pair of legs together in the axial direction,
each of the winding groups is wave-wound from the radially inner side to the radially outer side of the armature core, with a first end of the winding group being disposed on one side of the radially inner side or the radially outer side of the armature core, and a second end being disposed on the other radial side;
In each of the slots, n pieces (n is an even number) of the legs of the unit coils are arranged in a row in the radial direction and accommodated, forming n winding layers in the radial direction. If n/2 winding layers are defined in the radial direction, then 2K pieces of the winding group are arranged for each phase in each of the n/2 winding layers,
In each phase, the second ends of the winding groups are connected to each other to form a series winding group, and the series winding groups are connected in parallel.
Rotating electric machine armature.

(Appendix 2)
The winding groups are respectively housed in the slots successively in the circumferential direction for each phase, and a plurality of the winding groups of the same phase that are successive in the circumferential direction are defined as a same-phase winding group.
Between the in-phase winding groups, the second ends located at positions circumferentially symmetrical with respect to a first wire extending radially through a circumferential center between the in-phase winding groups are connected to each other by a jumper portion to form the series winding group.
2. An armature for a rotating electric machine according to claim 1.

(Appendix 3)
The circumferential spacing between the slots is t,
The total number of the slots of the armature core is S,
If the number of magnetic poles of the rotor is M,
The circumferential length L of the transition portion in each phase is
L = X × t
However, S/M-(K-1)≦X≦S/M+(K-1)
It is composed of
3. An armature for a rotating electric machine according to claim 2.

(Appendix 4)
Each of the unit coils has a protrusion protruding from the slot at the other axial end of the leg,
the unit coil constituting the first end of the winding group is configured so that the length of the protruding portion constituting the first end is longer than the length of the protruding portion of the other unit coils constituting the winding group.
4. The armature of a rotating electric machine according to claim 1 .

(Appendix 5)
The number of slots per pole per phase K is 3 or more,
The number of the series winding groups connected in parallel in each phase is configured to be the same as the number of slots K per pole per phase.
5. The armature of a rotating electric machine according to claim 1 .

(Appendix 6)
the first end of the winding group is provided radially inward of the armature core;
6. The armature of a rotating electric machine according to claim 1 .

(Appendix 7)
The first ends of the phases are arranged at intervals of 120 degrees ± 10 degrees in mechanical angle between the phases.
7. The armature of a rotating electric machine according to claim 1 .

(Appendix 8)
The rotating electric machine armature according to any one of Supplementary Note 1 to Supplementary Note 7 is used as a stator,
A rotating electric machine comprising: a rotor arranged coaxially with the stator so as to face the stator.

40 unit coil, 41 slot receiving portion (leg portion),
42 coil end portion (connection portion), 46 joint (crossover portion),
50, 50A, 50B Stator (armature), 51 Stator core (armature core),
51T teeth portion, 51S slot, 55 coil (armature winding),
55G winding group, 55GS series winding group, 60 rotor, 100 rotating motor.

Claims (8)

an armature core having a plurality of teeth arranged in an annular shape at set intervals and protruding radially inward; and a multi-phase armature winding housed in a plurality of slots formed between adjacent teeth,
In an armature of a rotating electric machine, the number of slots per pole per phase obtained by dividing the total number of slots by the number of phases and the number of magnetic poles of a rotor having a plurality of magnetic poles is an integer K of 2 or more,
The armature winding is
a plurality of winding groups each formed by connecting a plurality of unit coils, each unit coil being housed in the slot spaced circumferentially by an electrical angle of 180 degrees, the unit coil having a pair of legs whose radial positions within the slot are displaced from each other, and a connecting portion connecting one ends of the pair of legs together in the axial direction,
each of the winding groups is wave-wound from the radially inner side to the radially outer side of the armature core, with a first end of the winding group being disposed on one side of the radially inner side or the radially outer side of the armature core, and a second end being disposed on the other radial side;
In each of the slots, n pieces (n is an even number) of the legs of the unit coils are arranged in a row in the radial direction and accommodated, forming n winding layers in the radial direction. If n/2 winding layers are defined in the radial direction, then 2K pieces of the winding group are arranged for each phase in each of the n/2 winding layers,
In each phase, the second ends of the winding groups are connected to each other to form a series winding group, and the series winding groups are connected in parallel.
Rotating electric machine armature. The winding groups are respectively housed in the slots successively in the circumferential direction for each phase, and a plurality of the winding groups of the same phase that are successive in the circumferential direction are defined as a same-phase winding group.
Between the in-phase winding groups, the second ends located at positions circumferentially symmetrical with respect to a first wire extending radially through a circumferential center between the in-phase winding groups are connected to each other by a jumper portion to form the series winding group.
2. The armature for a rotating electric machine according to claim 1. The circumferential spacing between the slots is t,
The total number of the slots of the armature core is S,
If the number of magnetic poles of the rotor is M,
The circumferential length L of the transition portion in each phase is
L = X × t
However, S/M-(K-1)≦X≦S/M+(K-1)
It is composed of
3. The armature for a rotating electric machine according to claim 2. Each of the unit coils has a protrusion protruding from the slot at the other axial end of the leg,
the unit coil constituting the first end of the winding group is configured so that the length of the protruding portion constituting the first end is longer than the length of the protruding portion of the other unit coils constituting the winding group.
4. The armature for a rotating electric machine according to claim 3. The number of slots per pole per phase K is 3 or more,
The number of the series winding groups connected in parallel in each phase is configured to be the same as the number of slots K per pole per phase.
The armature for a rotating electric machine according to any one of claims 1 to 4. the first end of the winding group is provided radially inward of the armature core;
The armature for a rotating electric machine according to any one of claims 1 to 4. The first ends of the phases are arranged at intervals of 120 degrees ± 10 degrees in mechanical angle between the phases.
The armature for a rotating electric machine according to any one of claims 1 to 4. The armature of a rotating electric machine according to any one of claims 1 to 4 is used as a stator,
A rotating electric machine comprising: a rotor arranged coaxially with the stator so as to face the stator.