CN112953069B - Rotating motor - Google Patents

Abstract

We provide a rotating electrical machine that can minimize structural changes to the coils of each phase and increase output. In the plurality of slots (12) of the stator core (11), element conductors (legs) (42) of a plurality of bifurcated segmented coils (41) are arranged in a radial direction of the stator core (11), The coils (21X) of each phase are formed by joining the tip portions (43) of the element conductors (42) to each other. The number (predetermined number) of element conductors (42) arranged in each slot (12) is such that half of the element conductors (42) becomes an even number. The total number of joints between half of the element conductors (42) on the inner circumferential side and the outer circumferential side of each slot (12) and other element conductors (42) is an odd number smaller than the above-mentioned predetermined number.

Description

Rotating motor

Technical field

The present invention relates to a rotating electrical machine including a stator coil mounted on a stator.

Background technique

Conventionally, as seen in Patent Document 1, for example, a rotating electrical machine is known which has a structure in which a plurality of segmented coils formed in a bifurcated shape (substantially U-shaped) and formed of conductor wires are connected in series. The coils are used as coils for each phase assembled in the stator core.

In this rotating electric machine, in a plurality of slots formed in the inner circumferential portion of the stator core so as to be arranged at regular intervals in the circumferential direction, the element conductors serving as the two legs of the segment coil are formed from the axial direction of the stator core. One end side is inserted into each pair of two slots spaced at a certain distance in the circumferential direction of the stator core. Each element conductor penetrates the slot in the axial direction of the stator core and protrudes toward the other end side of the stator core.

In this case, each segment coil is formed such that the two element conductors (legs) have a predetermined interval in the radial direction of the stator core in addition to the interval in the circumferential direction of the stator core. Furthermore, one element conductor of each segment coil is arranged in one of the two slots of each pair at the inner circumference of the stator core, and the other element conductor is arranged in the other element at the outer circumference of the stator core. within a slot. Furthermore, in each slot, four element conductors are arranged along the radial direction of the stator core at a position close to the outer circumference of the stator core, and four element conductors are arranged along the radial direction of the stator core at a position close to the inner circumference of the stator core. In the element conductor mode, insert the element conductors of each of the 8 segmented coils.

In addition, the tip portion of each element conductor (leg portion) protruding toward the other end side in the axial direction of the stator core is bent along the circumferential direction of the stator core (hereinafter, the tip portion is referred to as a bent portion). In this case, the bending amount of the bending portion of each element conductor (the distance from the straight portion of the element conductor arranged in the slot to the tip end of the bending portion (the distance in the circumferential direction of the stator core)) same.

Prior technical documents

patent documents

Patent Document 1: Japanese Patent Application Publication No. 2015-23670

Contents of the invention

Invent the problem to be solved

In addition, it is sometimes desired to further increase the output (output energy per unit time) of the rotating electrical machine. In this case, in order to improve the output of the rotating electric machine, it is considered to reduce the number of turns of the coil per magnetic pole. For example, in a rotating electric machine having a structure as shown in Patent Document 1, it is considered that the number of element conductors arranged in each slot of the stator core is less than eight.

However, when reducing the number of element conductors arranged in each slot, it may be necessary to significantly change the connection form of the element conductors and the structure of necessary components from the conventional structure. This may even prevent the manufacturing cost of the rotating electrical machine from being suppressed.

The present invention was made in view of this background, and an object thereof is to provide a rotating electrical machine that can reduce structural changes of the coils of each phase as much as possible and improve output.

Solutions for solving problems

In order to achieve the above object, the rotating electrical machine of the present invention includes: a stator core in which a plurality of slots are formed in a circumferential arrangement; and multi-phase coils assembled in the stator core, and The rotating electric machine is provided with a plurality of segmented coils as components of the coils of each phase. Each of the plurality of segmented coils has two element conductors and a connection conductor. The two element conductors are respectively arranged on the stator core. There are two slots with a predetermined interval in the circumferential direction, and one of the two slots is arranged at a position closer to the inner circumference in the radial direction of the stator core, and the other slot is arranged at an inner circumference of the stator core. The position near the outer circumference in the radial direction; the connecting portion conductor connects the two element conductors on the first end side of both ends in the axial direction of the stator core, and there are a plurality of coils for each phase. A coil having a structure in which the tip portions of each element conductor of the segmented coil are joined to each other on the second end side of both axial ends of the stator core, and furthermore, in each slot of the stator core, the diameter is A predetermined number of element conductors are arranged upward, and slots are arranged such that only the element conductors of the coils of the same phase among the plural phases are arranged, and the slots of the element conductors of the coils of two or more phases are arranged in the circumferential direction. The predetermined number of element conductors are arranged in an alternating arrangement, and the rotating electrical machine is characterized in that the predetermined number, which is the number of element conductors arranged in each slot, is set to an even number, which is half of the predetermined number. The number of the predetermined number of element conductors arranged in each of the slots is determined by the total number of joints between half of the element conductors near the inner circumference and the element conductors of other slots, and The total number of joints between each of the outer circumferential half of the element conductors and the element conductors of other slots becomes an odd number smaller than half of the predetermined number of element conductors with each of the other slots. Element conductor bonding (first invention).

According to the first invention, it is possible to connect at least two element conductors in parallel with the element conductors of other slots among half of the element conductors located on the inner circumference of each slot (= half of the predetermined number). Furthermore, at least two element conductors among half of the element conductors (= half of the predetermined number) located on the outer periphery of each slot can be connected in parallel with the element conductors of other slots.

As a result, the total number of joints between each of the inner half of the element conductors of each slot and the element conductors of other slots, and the total number of joints between each of the outer half of the element conductors and the element conductors of other slots Compared with the conventional solution in which the total number of joints is equal to half of the predetermined number, the number of turns per magnetic pole of the coil of each phase can be reduced. Furthermore, the output of the rotating electrical machine (output energy per unit time) can be improved compared to the above-mentioned conventional scheme.

In addition, the structure other than the connection structure of the element conductors on the second end side can be the same structure as the conventional one. Therefore, compared with conventional solutions, it is possible to reduce the structural changes of the coils of each phase as much as possible and improve the output.

Furthermore, more existing production equipment can be used without significant specification changes. For example, a conventional machine can be used as a machine for manufacturing each segment coil and a machine for inserting the element conductor as the leg portion of each segment coil into the slot of the stator core. Therefore, a stator in which the coils of each phase are mounted on the stator core can be manufactured at low cost.

In the above-described first invention, the joint portion between each of the inner half of the element conductors of the predetermined number of element conductors arranged in each of the slots and the element conductors of other slots may be The total number is an odd number that is 1 less than half of the prescribed number (second invention)

This makes it possible to limit the number of pairs of parallel-connected element conductors among the predetermined number of element conductors in each slot to a minimum, thereby preventing the connection pattern of the element conductors on the second end side from becoming complicated.

In the above-mentioned first invention or second invention, it is preferable that a pair of two segmented coils adjacent to each other in the radial direction and connected in parallel is provided with the coils of each phase being spaced apart in the circumferential direction. In this way, the element conductors of the plurality of segmented coils of the coils of each phase are joined to each other on the second end side (third invention).

According to this, the two adjacent element conductors on the inner circumference of the pair of segmented coils are connected in parallel, and the two adjacent element conductors on the outer circumference of the pair are connected in parallel. Therefore, the element conductors can be easily joined to each other.

In the above fourth invention, it is preferable that the two segment coils constituting each pair of the segment coils each include an element conductor closest to the inner circumference in the radial direction, and an element conductor located in the inner circumference of the element conductor. Segmented coils of radially adjacent element conductors (fourth invention).

According to this, each pair of segmented coils connected in parallel is the segmented coil adjacent to the innermost circumferential side in the radial direction. Therefore, the eddy current loss of the coils of each phase can be suppressed as much as possible.

Description of the drawings

FIG. 1 is a diagram showing a stator core of a rotating electrical machine according to an embodiment (first embodiment and second embodiment) of the present invention.

FIG. 2 is a circuit diagram showing the overall circuit structure of the stator coil of the rotating electric machine according to the embodiment.

3 is a perspective view of the segmented coil in the embodiment as viewed from the connecting portion conductor side.

4 is a diagram illustrating the arrangement and connection form of element conductors of the segmented coils of the coils in the first embodiment.

5A is a diagram illustrating the arrangement and connection of element conductors of a part of the U-phase coil in the first embodiment, and FIG. 5B is a diagram illustrating the connection of element conductors of the part of the coil.

6A is a diagram illustrating the arrangement and connection of element conductors of a part of the U-phase coil in the first embodiment, and FIG. 6B is a diagram illustrating the connection of element conductors of the part of the coil.

FIG. 7 is a diagram illustrating the arrangement and connection form of the element conductors of the segmented coils of the coils of each phase in the second embodiment.

8A is a diagram illustrating the arrangement and connection of element conductors of a part of the U-phase coil in the second embodiment, and FIG. 8B is a diagram illustrating the connection of the element conductors of the part of the coil.

9A is a diagram illustrating the arrangement and connection of element conductors of a part of the U-phase coil in the second embodiment, and FIG. 9B is a diagram illustrating the connection of the element conductors of the part of the coil.

FIG. 10 is a diagram illustrating the arrangement and connection form of the element conductors of the segmented coils of the coils of each phase in the third embodiment.

11A is a diagram illustrating the arrangement and connection of element conductors of a part of the U-phase coil in the third embodiment, and FIG. 11B is a diagram illustrating the connection of element conductors of the part of the coil.

12A is a diagram illustrating the arrangement and connection of element conductors of a part of the U-phase coil in the third embodiment, and FIG. 12B is a diagram illustrating the connection of element conductors of the part of the coil.

Explanation of reference symbols:

11...stator core, 12...slot, 21U, 21V, 21W...coil, 41...segmented coil, 42...element conductor, 43...bent part (top part of element conductor), 44...connection conductor.

Detailed ways

[First Embodiment]

1 to 6B, the first embodiment of the present invention will be described below. The rotating electrical machine of this embodiment includes a substantially cylindrical stator core 11 arranged around the rotor 1 and a stator coil 21 mounted on the stator core 11 .

As shown in FIG. 1 , a plurality of slots 12 are formed on the inner circumference of the stator core 11 at regular intervals in the circumferential direction of the stator core 11 (the direction around the axis of the stator core 11 ). Each slot 12 is formed to penetrate the stator core 11 along its axial direction.

As shown in FIG. 2 , the stator coil 21 is composed of three-phase coils: a U-phase coil 21U, a V-phase coil 21V, and a W-phase coil 21W. In the following description, when there is no need to distinguish the U phase, V phase, and W phase, "X" is added to the reference numeral of the component corresponding to any one of them. For example, any one of the U-phase coil 21U, the V-phase coil 21V, and the W-phase coil 21W is referred to as a coil 21X. In this case, "X" means any one of U, V, and W.

In this embodiment, the coil 21X of each phase is configured by connecting in parallel a coil in which two coils 21X1 and 21X2 are connected in series and a coil in which two coils 21X3 and 21X4 are connected in series. Furthermore, one ends of each of the U-phase, V-phase, and W-phase coils 21U, 21V, and 21W are connected to each other at the neutral point 22 . Moreover, the other end of the coil 21X of each phase is connected to the current input/output terminal 23X which serves as the input/output part of the energized current of the coil 21X, respectively, for each phase.

The coils 21X1 to 21X4 of each phase each include a plurality (a predetermined number) of element conductors 42 respectively arranged in the slot 12 as a partial component thereof, as shown in FIG. 4 . Each element conductor 42 is a portion corresponding to one of the two leg portions of the segmented coil 41 formed in a bifurcated shape (approximately U-shaped) as shown in FIG. 3 , details of which will be described later.

Each element conductor 42 is inserted into the slot 12 so as to linearly penetrate the slot 12 along the axial direction of the stator core 11 . Furthermore, the coils 21X1 to 21X4 of each phase are configured by connecting a plurality (a predetermined number) of element conductors 42 in series.

In FIG. 4 , the axial direction of the stator core 11 is the direction perpendicular to the paper surface, the circumferential direction of the stator core 11 is the transverse direction, the radial direction of the stator core 11 is the longitudinal direction, and a part of the entire slot 12 is Each element conductor 42 arranged in the plurality of slots 12 is described as viewed from one end side (first end side to be described later) of the stator core 11 in the axial direction. In addition, in FIG. 4 , for convenience of explanation, the element conductors 42 shown by thick lines and the element conductors 42 shown by thin lines are mixed together and described. These are the same in FIGS. 5A, 6A, 7, 8A, 9A, 10, 11A, and 12A to be described later.

Here, in this embodiment, the number of pole pairs of magnetic poles generated by the stator coil 21 (the number of pairs of N poles and S poles) is, for example, 6 pole pairs (12 poles in total). As described above, the number of phases of the stator coil 21 is three, and the coil 21X of each phase is configured by connecting in parallel the coils in which the coils 21X1 and 21X2 are connected in series and the coils in which the coils 21X3 and 21X4 are connected in series.

Therefore, in this embodiment, the number N of slots per pole is N=3×2=6. Furthermore, a total of 72 (=6×12) slots 12 are formed in the stator core 11 . In addition, in each slot 12 , eight element conductors 42 are arranged in eight layers in an orderly manner in the radial direction of the stator core 11 .

In addition, in this embodiment, the coils 21X1 to 21X4 of each phase have 48 element conductors 42 respectively. Furthermore, the coils 21X1 to 21X4 of each phase are configured by connecting 48 element conductors 42 inserted into the slots 12 in a combination of series connection and parallel connection.

Hereinafter, a more specific connection structure of the coils 21X1 to 21X4 of each phase will be described in detail. It should be noted that in the following description, the arrangement position in the radial direction of the stator core 11 of each of the eight element conductors 42 inserted into each slot 12 will be from the radially inner side (inner circumferential side) of the stator core 11 They are called the first layer, the second layer, ..., and the eighth layer toward the outside (peripheral side).

In addition, a predetermined one of the two directions in the circumferential direction of the stator core 11 , namely the clockwise direction and the counterclockwise direction, is called the circumferential positive side, and the opposite direction to the one direction is called the circumferential negative side. In the description of this embodiment, for convenience, the circumferential positive side is defined as the rightward direction in FIG. 4 , and the circumferential negative side is defined as the leftward direction in FIG. 4 .

In the present embodiment, the two element conductors 42 and 42 arranged in the two slots 12 and 12 with a predetermined interval in the circumferential direction of the stator core 11 are formed into a bifurcated shape (roughly U-shaped) as shown in FIG. 3 The two legs of the segmented coil 41 are formed of conductor wires. Hereinafter, the element conductor 42 may be referred to as the leg portion 42 .

Here, in this embodiment, a bundle of four segment coils 41 is produced as one set of coil components 40 (hereinafter referred to as the segment coil group 40). Note that FIG. 3 is a perspective view of the segmented coil group 40 when viewed from the head side of the segmented coil 41 (the connection portion conductor 44 side to be described later).

As shown in FIG. 3 , the segmented coil group 40 is produced by bending a conductor harness (not shown) in which four conductor wires are insulated from each other and connected in parallel into a bifurcated shape (approximately U-shaped). As a result, each of the four conductor wires is processed into a bifurcated segmented coil 41 .

Each segmented coil 41 thus formed into a bifurcated shape (approximately U-shaped) has an integral structure with two leg portions (element conductors) 42 and 42 extending linearly in parallel to each other. The connection portion conductor 44 is a portion where the ends on the base end side are connected to each other.

In this case, the segmented coil 41 is formed such that the two leg portions (element conductors) 42 and 42 of the segmented coil 41 are spaced at intervals of 5 slot pitches in the circumferential direction of the stator core 11 . There is an amount of spacing corresponding to 4 layers in the radial direction. It should be noted that in this specification, one slot pitch refers to the interval between any two slots 12 and 12 adjacent to each other in the circumferential direction of the stator core 11 (the distance in the direction around the axis of the stator core 11 Angle difference), n slot pitch refers to the interval n times the 1 slot pitch. When the total number of slots 12 is 72, the pitch of one slot corresponds to an angular difference of 5° in the direction around the axis of the stator core 11 .

The four segment coils 41 of each segment coil group 40 formed as described above are illustrated with respect to the 10th slot 12 and the 15th slot 12 in FIG. 4 . The bundle of four leg portions 42 on one side and the bundle of four leg portions 42 on the other side are inserted into one slot 12 and relative to the stator core 11 so as to penetrate from one end side to the other end side in the axial direction. The slot 12 has a pair of two slots 12 , 12 consisting of other slots 12 spaced apart by a 5-slot pitch.

In this case, in the slot 12 (for example, the slot No. 10 in FIG. 4 ) on the center side (negative side in the circumferential direction) of the two slots 12 , 12 , the four legs The (element conductors) 42 are respectively arranged on the fifth, sixth, seventh and eighth layers on the outer side in the radial direction of the stator core 11, and on the slot 12 on the other side (the positive side in the circumferential direction) (in FIG. 4 (for example, slot No. 15), the four legs 42 are respectively arranged on the first layer, the second layer, the third layer and the fourth layer on the inner side in the radial direction of the stator core 11 .

In this way, into each pair of slots 12 and 12 composed of each slot 12 of the stator core 11 and slots 12 spaced at intervals of 5 slot pitches relative to the slots 12 in the circumferential direction of the stator core 11, The four legs 42 on one side and the four legs 42 on the other side of the segmented coil assembly 40 are inserted.

Accordingly, in each slot 12 , as shown in FIG. 4 , eight element conductors (legs) 42 are arranged in eight layers in the radial direction of the stator core 11 . Therefore, half of the number (=8) of the element conductors 42 arranged in each slot 12 (=8/2=4) is an even number.

In addition, the connection conductor 44 of each segment coil 41 is arranged on one end side of the stator core 11 in the axial direction. In the following description, one side of the two axial ends of the stator core 11 where the connecting portion conductor 44 of each segment coil 41 is arranged is called a first end, and the opposite side is called a second end. In addition, in the following description, when distinguishing the four segmented coils 41 of the segmented coil group 40, there may be a case where the first layer and the fifth layer are respectively provided in the two slots 12. The segmented coil 41 having the two legs 42 arranged on the second layer and the sixth layer is denoted by the reference numeral 41b. The segmented coil 41 having two legs 42 respectively arranged on the third layer and the seventh layer is represented by reference numeral 41c. The segmented coil 41 having the two legs 42 arranged respectively on the fourth layer and the eighth layer is represented by Indicated by reference numeral 41d. Supplementary explanation is as follows. In this embodiment, the arrangement of the leg portions 42 of each segment coil 41 in each slot 12 is the same as the arrangement described in Patent Document 1.

The top end of each leg (element conductor) 42 of each segment coil 41 protruding toward the second end side in the axial direction of the stator core 11 is connected to the top end of the other leg 42 as shown by the dotted line in FIG. 4 . It is bent in the circumferential direction of the stator core 11 or in a direction close to the circumferential direction. Hereinafter, the top end portion of each leg portion 42 bent in this way will be referred to as a bent portion 43.

In this case, in the present embodiment, the coils 21X1 to 21X4 of each phase are connected so that they can alternately generate N poles and S poles every six slot pitches in the circumferential direction of the stator core 11 . A plurality of element conductors (legs) 42 constitute each coil of the coils 21X1 to 21X4 of each phase. Therefore, in the present embodiment, the bending direction of the bending portion 43 connected to the straight portion (the portion arranged in the slot 12 ) of each leg portion 42 of each segment coil 41 in the circumferential direction of the stator core 11 , and the bending amount in the circumferential direction (specifically, the distance in the circumferential direction between the straight portion of the leg portion 42 and the top end of the bent portion 43 connected to the straight portion) is set as follows.

That is, referring to the segmented coil group 40 shown in FIG. 4 (the segmented coil group 40 having the connecting conductor 44 between the tenth slot 12 and the fifteenth slot 12), it can be seen that each segmented coil The bent portions 43 of the leg portions 42 of the first, second and fourth layers of the group 40 are directed from the slot 12 in which the straight portion of the leg portion 42 is arranged toward the third portion in which the segmented coil group 40 is arranged. The slots 12 of the legs 42 of the fifth, sixth and eighth layers are bent on the same side (the circumferential negative side in Figure 4).

In addition, the bent portion 43 of the leg portion 42 of the third layer of each segmented coil group 40 is directed from the slot 12 in which the leg portion 42 is arranged toward the respective leg portions 42 of the first, second and fourth layers. The bending portion 43 is bent on the side opposite to the bending direction (the positive side in the circumferential direction in FIG. 4 ).

In addition, the bent portions 43 of the leg portions 42 of the fifth, sixth and eighth layers of each segmented coil assembly 40 face from the slot 12 in which the leg portion 42 is disposed toward the segmented coil assembly. The slots 12 of the respective legs 42 of the first to fourth layers of 40 are bent on the same side (the positive side in the circumferential direction in FIG. 4 ).

In addition, the bent portion 43 of the leg portion 42 of the seventh layer of each segmented coil group 40 is directed from the slot 12 in which the leg portion 42 is arranged toward the respective leg portions 42 of the fifth, sixth and eighth layers. The bending portion 43 is bent on the opposite side to the bending direction (the negative side in the circumferential direction in FIG. 4 ).

As described above, in this embodiment, the bent portions 43 of the leg portions 42 of the first, second, fourth and seventh layers of each segmented coil group 40 are in contact with the third and fifth layers. The bent portions 43 of the leg portions 42 of the sixth layer and the eighth layer are bent toward opposite sides in the circumferential direction of the stator core 11 .

In this case, the bent portions 43 of the legs 42 of the first and second layers of each segmented coil assembly 40 and the segments having a pitch of 6 slots from the segmented coil assembly 40 to the negative side in the circumferential direction. As for the bent portions 43 of the leg portions 42 of the third layer of the other segmented coil groups 40 , the top ends of the bent portions 43 are bent close to each other in the radial direction of the stator core 11 .

In addition, the bent portions 43 of the leg portions 42 of the eighth layer of each segmented coil group 40 and the third segments of the other segmented coil groups 40 having an interval of 6 slot pitches from the segmented coil group 40 to the positive side in the circumferential direction. Regarding the bent portions 43 of the seven-layered leg portions 42 , the top ends of the bent portions 43 are bent close to each other in the radial direction of the stator core 11 .

Furthermore, regarding the bent portions 43 of the leg portions 42 of the fifth and sixth layers of each segmented coil group 40 and the bent portions 43 of the leg portions 42 of the fourth layer of the segmented coil group 40, The top ends of these bent portions 43 are bent close to each other in the radial direction of the stator core 11 .

In addition, regarding the bending amount of the bending portion 43 of each leg portion 42 of the segmented coil group 40 (the bending amount in the circumferential direction of the stator core 11), in this embodiment, the first to third layers, The bending amounts of the bending portions 43 of the legs 42 of the seventh layer and the eighth layer are all the same, which is consistent with half of the 6-slot pitch (that is, the interval of the 3-slot pitch) or Approximately consistent amount of bend.

In addition, regarding the bending amount of the bending portion 43 of the leg portion 42 of the fourth layer, the fifth layer and the sixth layer, the bending amount of the bending portion 43 of the leg portion 42 of the fourth layer, and the fifth layer and the bending amount of the bending portion 43 of the leg portion 42 of the sixth layer, for example, the bending amount of the bending portion 43 of the leg portion 42 of the fourth layer is the same as that of the first to third layers. The bending amounts of the bending portions 43 of the leg portions 42 of the third layer, the seventh layer, and the eighth layer are substantially the same (an interval of three slot pitches).

On the other hand, the bending amount of the other side (the bending amount of the bending portion 43 of the leg 42 of each of the fifth and sixth layers in this embodiment) is larger than that of the first to third layers and the seventh layer. The bending amount of the bending portion 43 of the leg portion 42 of the eighth layer is short (an interval of three slot pitches) and is consistent or substantially consistent with the interval of two slot pitches.

Therefore, the sum of the bending amounts of the bending portions 43 of the leg portions 42 of the fourth layer and the bending portions of the leg portions 42 of the fifth and sixth layers is set to The segmented coil assembly 40 has four legs 42 on one side (the legs 42 of the first to fourth layers) and four legs 42 on the other side (the legs 42 of the fifth to eighth layers). ) (the distance in the circumferential direction of the stator core 11), that is, the distance between the 5 slot pitches is approximately the same. It should be noted that the bending amount of the bending portion 43 of the leg portion 42 of the fourth layer may be set to be greater than the bending amount of the bending portion 43 of the leg portion 42 of the fifth and sixth layers. short.

The bending direction and the bending amount of the bending portion 43 of each leg portion 42 of each segmented coil group 40 are set as above.

Next, in order to describe the connection structure between the bent portion 43 of each leg 42 of each segmented coil group 40 and the bent portion 43 of the other leg 42 below, for convenience of explanation, attention will be paid to one arbitrary segmented coil. The group 40 is called the segmented coil group 40. In addition, each of the leg portions 42 of the focused segmented coil group 40 is referred to as the focused leg portion 42 . For example, in FIG. 4 , the segmented coil group 40 having the connecting portion conductor 44 between the tenth slot 12 and the fifteenth slot 12 is called the focused segmented coil group 40 .

In this case, referring to FIG. 4 , it can be seen that the top end portions of the bent portions 43 of the respective leg portions 42 of the first and second layers of the segmented coil group 40 are close to each other in the radial direction of the stator core 11 . The insertion slots 12 of the focusing leg portion 42 are arranged in the insertion slots 12 with an interval of 6 slot pitches on the same side (the negative side in the circumferential direction) as the bending portion 43 (in other words, Focus on the top end portions of the bent portions 43 of the third-layer leg portions 42) of other segmented coil groups 40 arranged at intervals of 6 slot pitches toward the negative circumferential direction from the segmented coil group 40 . And the top ends of the bent portions 43 of the three leg portions 42 that are close to each other are joined to each other by welding or the like.

In addition, the top end of the bent portion 43 of the focused leg portion 42 of the third layer of the focused segmented coil group 40 is close to the same side as the bent portion 43 from the slot 12 in which the focused leg portion 42 is arranged. The leg portions 42 of the first layer and the second layer are arranged in the slots 12 with an interval of 6 slot pitches on the circumferential direction positive side) (in other words, looking at the segmented coil group 40 toward the circumferential direction positive side). The top ends of the bent portions 43 of the respective legs 42) of the first layer and the second layer of the other segmented coil groups 40 arranged at intervals. And the top ends of the bent portions 43 of the three leg portions 42 that are close to each other are joined to each other by welding or the like.

In addition, the top end of the bent portion 43 of the focused leg portion 42 of the fourth layer of the focused segmented coil group 40 is close to the bent portions of the focused leg portions 42 of the fifth and sixth layers of the focused segmented coil group 40 . The top end of part 43. And the top ends of the bent portions 43 of the three leg portions 42 that are close to each other are joined to each other by welding or the like.

In addition, the top end of the bent portion 43 of the focused leg portion 42 of the seventh layer of the focused segmented coil group 40 is close to the same side as the bent portion 43 from the slot 12 in which the focused leg portion 42 is arranged. The legs 42 of the eighth layer are arranged in the slots 12 with an interval of 6 slot pitches on the negative side in the circumferential direction (in other words, there are 6 slot pitch intervals from the segmented coil group 40 to the negative side in the circumferential direction). The top end portion of the bent portion 43 of the leg portion 42) of the sixth layer of the other segmented coil group 40 is arranged. And the top ends of the bent portions 43 of the two adjacent leg portions 42 are joined to each other by welding or the like.

In addition, the top end of the bent portion 43 of the focused leg portion 42 of the eighth layer of the focused segmented coil group 40 is close to the same side as the bent portion 43 from the slot 12 in which the focused leg portion 42 is arranged. The leg portions 42 of the seventh layer are arranged in the slots 12 with an interval of 6 slot pitches on the circumferential positive side) (in other words, the other legs 42 of the seventh layer are arranged with an interval of 6 slot pitches from the segmented coil group 40 to the circumferential positive side). The top end of the bent portion 43 of the leg portion 42) of the seventh layer of the segmented coil group 40. And the top ends of the bent portions 43 of the two adjacent leg portions 42 are joined to each other by welding or the like.

In this embodiment, as described above, the top end of the bent portion 43 of each leg portion (element conductor) 42 of each segment coil group 40 and the other leg portions of one or two layers close to the top end portion The top end portion of the bent portion 43 of 42 is joined.

More specifically, the bending of two legs (element conductors) 42 respectively arranged on the first layer and the second layer of one slot 12 of the two slots 12 and 12 having an interval of 6 slots. The top end of the portion 43 is joined to the top end of the bent portion 43 of one leg (element conductor) 42 arranged on the third level of the other slot 12 . In this case, the segmented coil group 40 having the leg portions 42 of the first layer and the second layer and the segmented coil group 40 having the leg portion 42 of the third layer have six plugs in the circumferential direction of the stator core 11 . The segmented coil groups 40 are arranged different from each other at intervals of slot pitch.

In addition, the top end portion of the bent portion 43 of the leg (element conductor) 42 arranged on the seventh layer of one of the two slots 12 having a pitch of 6 slots is connected to the end of the bent portion 43 of the other slot 12 . The top ends of the bent portions 43 of the leg portions (element conductors) 42 arranged in the eighth layer of the slot 12 are joined to each other. In this case, the segmented coil group 40 having the leg portions 42 of the seventh layer and the segmented coil group 40 having the leg portions 42 of the eighth layer have an interval of 6 slot pitches in the circumferential direction of the stator core 11 The segmented coil groups 40 are configured differently from each other.

In addition, the bent portions 43 of the two leg portions (element conductors) 42 respectively arranged on the fifth and sixth layers of one slot 12 of the two slots 12 and 12 having an interval of 5 slots. The top end portion is joined to the top end portion of the bent portion 43 of one leg (element conductor) 42 arranged on the fourth level of the other slot 12 . In this case, the leg portions 42 of the fifth layer and the sixth layer and the leg portion 42 of the fourth layer are the leg portions 42 included in the common segmented coil group 40 .

Furthermore, in this case, the top ends of the bent portions 43 of the leg portions 42 of the first and second layers of each segmented coil group 40 are joined to each other, and the leg portions 42 of the fifth and sixth layers are joined to each other. The top ends of the bent portions 43 are joined to each other. Accordingly, in each segmented coil group 40, the segmented coil 41a including the leg portions 42 of the first and fifth layers is connected in parallel with the segmented coil 41b including the leg portions 42 of the second and sixth layers. connect.

In addition, among the eight element conductors 42 arranged in each slot 12, half of the element conductors 42 on the inner circumference (the element conductors 42 of the first to fourth layers) are each different from the element conductors of the other slots 12. The total number of joints between 42 and the total number of joints between each of the outer half of the element conductors 42 (the element conductors 42 of the fifth to eighth layers) and the element conductors of the other slots 12 is Three odd numbers are one less than half of the total number of element conductors 4 in each slot 12 (=8).

As described above, by connecting the element conductors (legs) 42 arranged in each slot 12 to each other, the coils 21X1 to 21X4 of each phase are configured. For example, among the U-phase coils 21U1 and 21U2 connected in series, the coil 21U1 is configured by connecting 48 element conductors 42 according to the pattern shown in FIGS. 5A and 5B , and the coil 21U2 is configured by connecting the 48 element conductors 42 according to the pattern shown in FIGS. 6A and 6B . The pattern is formed by connecting 48 element conductors 42 . In addition, FIG. 5B and FIG. 6B show the connection pattern of the element conductor 42 with the transverse direction being the circumferential direction of the stator core 11 and the longitudinal direction being the axial direction of the stator core 11 . This is the same in FIG. 8B, FIG. 9B, FIG. 11B, and FIG. 12B which will be described later.

In addition, in FIGS. 5A and 6A , among the U-phase coils 21U1 to 21U4 , the element conductors 42 of the coils 21U1 and 21U2 are shown in gray, and the element conductors 42 of the coils 21U3 and 21U4 are shown in white. In addition, in FIGS. 5A and 6A , the numbers in the reference numerals (13U, etc.) attached to each element conductor 42 indicate the connection sequence (conduction sequence) of the element conductor 42 from the current input/output terminal 23U to the neutral point 22 ), the U in this label indicates that the element conductor 42 belongs to the U phase. This is also the case in FIGS. 8A, 9A, 11A, and 12A to be described later.

As shown in FIGS. 5B and 6B , the coils 21U1 and 21U2 are formed so that the corrugated winding portions 25 and the overlapping winding portions 26 are alternately arranged at intervals of six slot pitches in the circumferential direction of the stator core 11 . In this case, in the overlapping winding part 26 , the two segment coils 41 a and 41 b located closest to the inner circumference of the segment coil group 40 are connected in parallel, and the segment coils 41 a and 41 b are connected in series with the segment coil 41 d. connect.

Therefore, the overlapping winding portion 26 uses a winding portion corresponding to one turn formed by a segment coil obtained by connecting two segment coils 41a and 41b in parallel, and a winding portion corresponding to one turn formed by the segment coil 41d. In essence, a double overlapping winding portion 26 is formed.

In addition, the arrangement position of the waveform winding portion 25 of the coil 21U1 in the circumferential direction of the stator core 11 and the arrangement position of the overlapping winding portion 26 of the coil 21U2 overlap each other within an interval of 6 slot pitches, and the overlap of the coil 21U1 The coils 21U1 and 21U2 are configured such that the arrangement position of the winding portion 26 and the arrangement position of the waveform winding portion 25 of the coil 21U2 overlap each other within a six-slot pitch interval.

The U-phase coils 21U3 and 21U4 are also configured similarly to the above-mentioned coils 21U1 and 21U2. In this case, the coil 21U3 is formed at a position shifted by one slot pitch relative to the coil 21U1 toward the negative side in the circumferential direction of the stator core 11 . In addition, the coil 21U4 is formed at a position shifted by one slot pitch relative to the coil 21U2 toward the positive side in the circumferential direction of the stator core 11 .

Coils 21V and 21W of phases other than the U phase (V phase, W phase) are also configured similarly to the U-phase coil 21U. In this case, the V-phase coil 21V is formed at a position shifted by an interval of 4 slot pitches (corresponding to 120° in electrical angle) in the circumferential direction of the stator core 11 relative to the U-phase coil 21U. The coil 21W is formed at a position shifted by an interval of four slot pitches (corresponding to 120° in electrical angle) in the circumferential direction of the stator core 11 relative to the V-phase coil 21V.

In addition, referring to FIGS. 5A and 6A , it can be seen that the slot 12 in which only the element conductors 42 of any one of the U phase, V phase, and W phase are arranged is different from the slot 12 in which the element conductors of the coils of the two phases are arranged four times each. They are arranged alternately in the circumferential direction of the stator core 11 .

In addition, among the coils 21X1 to 21X4 of each phase, the coils 21X1 and 21X2 are connected in series via a bridge conductor (not shown). The same applies to the connection of coils 21X3 and 21X4. In addition, the end portions of the coils 21X2 and 21X4 on the side of the neutral point 22 are connected to a conductor plate (not shown) that forms the neutral point 22 .

According to the present embodiment described above, among the segmented coils 41 constituting each coil of the coils 21X1 to 21X4 of each phase, there are pairs of the same slots 12 (two slots with an interval of 5 slots pitch). The two segment coils 41a and 41b of the element conductor 42 arranged in the pair of 12 are connected in parallel, so the two segment coils 41a and 41b can be treated as the same segment coil as the single segment coil 41 Each coil constitutes the coils 21X1 to 21X4 of each phase.

Therefore, although the number of element conductors 42 arranged in each slot 12 is eight as described in Patent Document 1, the point in which each magnetic pole is generated at intervals of six slot pitches is different from that described in Patent Document 1. A case where two legs 42 of each of three segment coils 41 are arranged in each pair of two slots 12 with a pitch of 5 slots (in other words, six elements are arranged in each slot 12 The case of conductor 42) is essentially the same.

Therefore, according to this embodiment, the number of turns (number of windings) of the coil 21X for each phase of each magnetic pole can be substantially reduced compared to the conventional technology found in Patent Document 1. Furthermore, the output of the rotating electric machine can be improved compared to conventional methods.

In addition, the insertion of the leg portions (element conductors) 42 of the segmented coil 41 into the slots 12 so that eight element conductors 42 are arranged in each slot 12 is the same as that found in the above-mentioned Patent Document 1. The connection form of part of the element conductors 42 on the second end side of the stator core 11 is different from what is seen in the above-mentioned Patent Document 1.

Therefore, most of the production equipment and components related to the rotating electrical machine found in Patent Document 1 can be used to manufacture the stator of the rotating electrical machine of this embodiment. Furthermore, the rotating electrical machine of this embodiment can be manufactured at low cost.

In addition, in the present embodiment, the two (a pair) segment coils 41 a and 41 b connected in parallel in the segment coil group 40 are the two segment coils 41 on the innermost circumferential side of the stator core 11 , and therefore are different from the two segment coils 41 on the innermost peripheral side of the stator core 11 . Compared with the structures described in the second embodiment and the third embodiment described below, the eddy current loss can be reduced.

[Second Embodiment]

Next, a second embodiment of the present invention will be described with reference to FIGS. 7 to 9B. It should be noted that this embodiment differs from the first embodiment only in the connection structure of a part of the element conductor 42 constituting the coil 21X of each phase, and therefore the description of the same matters as in the first embodiment will be omitted.

In the first embodiment, the segment coils 41 a and 41 b in each segment coil group 40 are connected in parallel. However, the other two segment coils 41 may be connected in parallel. In this embodiment, for example, as shown in FIG. 7 , the segmented coil group 40 includes the segmented coil 41 b including the element conductor 42 of the second layer and the element conductor 42 of the sixth layer, and the segmented coil 41 b including the element conductor 42 of the third layer. The element conductor 42 and the segment coil 41c including the element conductor 42 of the seventh layer are connected in parallel.

In this case, the bending direction and the bending amount of the bending portion 43 of each leg portion 42 of each segmented coil group 40 are set as follows.

That is, the bent portions 43 of the leg portions (element conductors) 42 of the first, fourth, sixth and seventh layers of each segmented coil group 40 are bent toward the negative side in the circumferential direction in FIG. 7 , The bent portions 43 of the leg portions (element conductors) 42 of the second, third, fifth and eighth layers are bent toward the positive side in the circumferential direction in FIG. 7 . In this case, the bending amount of the bending portion 43 of the leg portion 42 of each of the first to third layers and the sixth to eighth layers is a bending amount that is consistent or substantially consistent with the three-slot pitch interval. quantity.

In addition, the bending amount of any one of the leg portions 42 of the fourth layer and the fifth layer, for example, the bending amount of the bending portion 43 of the leg portion 42 of the fourth layer is equal to 3. The pitch of the slots is at the same or approximately the same bending amount. On the other hand, the bending amount of the leg part 42 of the fifth layer which is the other leg part 42 is shorter than the bending amount of the leg part 42 of the other layer (an interval of 3 slot pitches) and is different from the 2-slot pitch. The pitch intervals are consistent or approximately consistent in the amount of bending. In addition, contrary to the above, the bending amount of the bending part 43 of the leg part 42 of the 4th layer may be set shorter than the bending amount of the leg part 42 of the fifth layer.

Furthermore, the bent portion 43 of the leg (element conductor) 42 arranged on the first level of one slot 12 of the two slots 12 having a pitch of 6, and the bent portion 43 of the other slot 12 As for the bent portions 43 of the two leg portions (element conductors) 42 respectively arranged on the second layer and the third layer of 12, their top ends are bent so as to approach each other. Furthermore, the top ends of the bent portions 43 of the three leg portions 42 are joined to each other. In this case, the segmented coil group 40 having the leg portions 42 of the first layer and the segmented coil group 40 having the leg portions 42 of the second layer and the third layer have 6 pixels in the circumferential direction of the stator core 11 . The segmented coil groups 40 are arranged with different slot pitch intervals.

In addition, the bent portions 43 of the two leg portions (element conductors) 42 are respectively arranged on the sixth and seventh layers of one slot 12 of the two slots 12 having a pitch of 6 slots. , and the bent portion 43 of the leg portion (element conductor) 42 arranged on the eighth layer of the other slot 12, their top ends are bent so as to approach each other. Furthermore, the top ends of the bent portions 43 of the three leg portions 42 are joined to each other. In this case, the segmented coil group 40 having the leg portions 42 of the sixth layer and the seventh layer, and the segmented coil group 40 having the leg portion 42 of the eighth layer have six layers in the circumferential direction of the stator core 11 . The segmented coil groups 40 are arranged with different slot pitch intervals.

In addition, the bent portion 43 of the leg (element conductor) 42 arranged on the fifth level of one slot 12 of the two slots 12 having an interval of 5 slots, and the bent portion 43 of the other slot 12 As for the bent portions 43 of the leg portions (element conductors) 42 arranged in the fourth layer of 12, their top ends are bent so as to approach each other. Furthermore, the top ends of the bent portions 43 of the two leg portions 42 are joined to each other. In this case, the leg portions 42 of the fifth layer and the leg portions 42 of the fourth layer are the leg portions 42 included in the common segmented coil group 40 .

Through the above-mentioned connection structure, the top ends of the bent portions 43 of the leg portions 42 of the second and fourth layers of each segmented coil group 40 are joined to each other, and the respective leg portions 42 of the sixth and seventh layers are joined to each other. The top end portions of the bent portions 43 are joined to each other. As a result, the segmented coils 41a including the leg portions 42 of the second and sixth layers in each segmented coil group 40 and the segmented coils 41a including the leg portions 42 of the third and seventh layers are formed. The segment coils 41b are connected in parallel.

In addition, among the eight element conductors 42 arranged in each slot 12, half of the element conductors 42 on the inner circumference (the element conductors 42 of the first to fourth layers) are each different from the element conductors of the other slots 12. The total number of joints between 42 and the total number of joints between each of the outer half of the element conductors 42 (the element conductors 42 of the fifth to eighth layers) and the element conductors of the other slots 12 is Three odd numbers are one less than half of the total number of element conductors 4 in each slot 12 (=8).

In the present embodiment, as described above, the element conductors (legs) 42 arranged in each slot 12 are connected to each other, thereby forming the coils 21X1 to 21X4 of each phase. For example, among the U-phase coils 21U1 and 21U2 connected in series, the coil 21U1 is configured by connecting 48 element conductors 42 according to the pattern shown in FIGS. 8A and 8B , and the coil 21U2 is configured by connecting the 48 element conductors 42 according to the pattern shown in FIGS. 9A and 9B . The pattern is formed by connecting 48 element conductors 42 .

In this case, as shown in FIGS. 8B and 9B , the coils 21U1 and 21U2 are formed in such a manner that the waveform winding portion 25 and the overlapping winding portion 26 are formed on the stator at intervals of six slot pitches, as in the first embodiment. The iron cores 11 are arranged alternately in the circumferential direction. However, in this embodiment, in the wave winding part 25, the two segment coils 41b and 41c in the segment coil group 40 are connected in parallel. In addition, the overlapping winding part 26 is formed into a double overlapping winding part 26 by using the two segment coils 41a and 41d.

In addition, similarly to the first embodiment, the arrangement position of the waveform winding portion 25 of the coil 21U1 and the arrangement position of the overlapping winding portion 26 of the coil 21U2 in the circumferential direction of the stator core 11 are mutually spaced within a six-slot pitch interval. The coils 21U1 and 21U2 are formed so that the arrangement position of the overlapping winding portion 26 of the coil 21U1 and the arrangement position of the waveform winding portion 25 of the coil 21U2 overlap each other within a six-slot pitch interval.

The U-phase coils 21U3 and 21U4 are also configured similarly to the above-mentioned coils 21U1 and 21U2. In this case, the coil 21U3 is formed at a position shifted by one slot pitch relative to the coil 21U1 toward the negative side in the circumferential direction of the stator core 11 . In addition, the coil 21U4 is formed at a position shifted by one slot pitch relative to the coil 21U2 toward the positive side in the circumferential direction of the stator core 11 .

Coils 21V and 21W of phases other than the U phase (V phase, W phase) are also configured similarly to the U-phase coil 21U. In this case, the V-phase coil 21V is formed at a position shifted by an interval of 4 slot pitches (corresponding to 120° in electrical angle) in the circumferential direction of the stator core 11 relative to the U-phase coil 21U. The coil 21W is formed at a position shifted by an interval of four slot pitches (corresponding to 120° in electrical angle) in the circumferential direction of the stator core 11 relative to the V-phase coil 21V.

It should be noted that among the coils 21X1 to 21X4 of each phase, the connection of the coils 21X1 and 21X2, the connection of the coils 21X3 and 21X4, and the connection between the coils 21X2 and 21X4 and the neutral point 22 are the same as in the first embodiment. conduct.

In addition, referring to FIGS. 8A and 9A , it can be seen that the slot 12 in which only the element conductor 42 of any one of the U phase, V phase, and W phase is arranged is different from the slot 12 in which the element conductors of the coils of the two phases are arranged four times each. The slots 12 are alternately arranged in the circumferential direction of the stator core 11 .

According to the present embodiment described above, by connecting the two segment coils 41 b and 41 c of each segment coil group 40 in parallel, the two segment coils 41 b and 41 c can be regarded as equivalent to the single segment coil 41 The segmented coils are processed to form each coil of the coils 21X1 to 21X4 of each phase. Therefore, this embodiment can also achieve the same effects as those of the first embodiment.

[Third Embodiment]

Next, a third embodiment of the present invention will be described with reference to FIGS. 10 to 12B. It should be noted that this embodiment differs from the first embodiment only in the connection structure of a part of the element conductor 42 constituting the coil 21X of each phase, and therefore the description of the same matters as in the first embodiment will be omitted.

In this embodiment, for example, as shown in FIG. 10 , the segment coil 41 c including the element conductor 42 of the third layer and the element conductor 42 of the seventh layer in the segment coil group 40 and the segment coil 41 c including the element conductor 42 of the fourth layer are The element conductor 42 and the segment coil 41d including the element conductor 42 of the eighth layer are connected in parallel.

In this case, the bending direction and the bending amount of the bending portion 43 of each leg portion 42 of each segmented coil group 40 are set as follows.

That is, the bent portions 43 of the leg portions (element conductors) 42 of the first, third, fourth and sixth layers of each segmented coil group 40 are bent toward the negative side in the circumferential direction in FIG. 10 , The bent portions 43 of the leg portions (element conductors) 42 of the second, fifth, seventh, and eighth layers are bent toward the positive side in the circumferential direction in FIG. 10 . In this case, the bending amount of the bending portion 43 of the leg portion 42 of each of the first layer, the second layer, and the sixth to eighth layers is a bending amount that is consistent or substantially consistent with the three-slot pitch interval. quantity.

In addition, regarding the bending amount of the bending portion 43 of the leg portion 42 of the third layer, the fourth layer and the fifth layer, the bending amount of the bending portion 43 of the leg portion 42 of the fifth layer, and the third layer and the bending amount of the bending portion 43 of the respective leg portion 42 of the fourth layer. For example, the bending amount of the respective leg portion 42 of the third layer and the fourth layer. The bending amount of the portion 43 is substantially the same as the bending amount (an interval of three slot pitches) of the bending portions 43 of the leg portions 42 of the first layer, the second layer, and the sixth to eighth layers.

On the other hand, the other bending amount (in this embodiment, the bending amount of the bending portion 43 of the leg portion 42 of the fifth layer) is larger than the bending amount of the bending portion 43 of the leg portion 42 of the other layer. (The interval of 3-slot pitch) is short, and the bending amount is consistent or approximately the same as the interval of 2-slot pitch. It should be noted that contrary to the above, the bending amount of the bending portion 43 of the leg portion 42 of the third layer and the fourth layer may be set to be shorter than the bending amount of the leg portion 42 of the fifth layer.

Furthermore, the bent portion 43 of the leg (element conductor) 42 arranged on the first level of one slot 12 of the two slots 12 having a pitch of 6, and the bent portion 43 of the other slot 12 As for the bent portions 43 of the two leg portions (element conductors) 42 arranged in the second layer of 12, their top ends are bent so as to approach each other. Furthermore, the top ends of the bent portions 43 of the two leg portions 42 are joined to each other. In this case, the segmented coil group 40 having the leg portions 42 of the first layer and the segmented coil group 40 having the leg portions 42 of the second layer have an interval of 6 slot pitches in the circumferential direction of the stator core 11 The segmented coil groups 40 are configured differently from each other.

In addition, the bent portions 43 of the two leg portions (element conductors) 42 are respectively arranged on the seventh and eighth layers of one slot 12 of the two slots 12 and 12 having an interval of 6 slots. , and the bent portion 43 of one leg (element conductor) 42 arranged on the sixth layer of the other slot 12, their top ends are bent so as to approach each other. Furthermore, the top ends of the bent portions 43 of the three leg portions 42 are joined to each other. In this case, the segmented coil group 40 having the leg portions 42 of the seventh layer and the eighth layer and the segmented coil group 40 having the leg portion 42 of the sixth layer have six plugs in the circumferential direction of the stator core 11 . The segmented coil groups 40 are arranged different from each other at intervals of slot pitch.

In addition, the bent portion 43 of one leg (element conductor) 42 arranged on the fifth level of one of the two slots 12 and 12 having an interval of 5 slots, and the bent portion 43 of the other one The bent portions 43 of the two leg portions (element conductors) 42 arranged on the third and fourth levels of the slot 12 are bent so that their top ends are close to each other. Furthermore, the top ends of the bent portions 43 of the three leg portions 42 are joined to each other. In this case, the leg portions 42 of the fifth layer and the leg portions 42 of the third and fourth layers are the leg portions 42 included in the common segmented coil group 40 .

Through the above-described connection structure, the top ends of the bent portions 43 of the leg portions 42 of the third and fourth layers of each segmented coil group 40 are joined to each other, and the top portions of the leg portions 42 of the seventh and eighth layers are joined to each other. The top end portions of the bent portions 43 are joined to each other. Therefore, in each segmented coil group 40, the segmented coil 41c including the leg portions 42 of the third layer and the seventh layer and the segment including the leg portions 42 of the fourth layer and the eighth layer are formed. Coil 41d is connected in parallel.

In addition, among the eight element conductors 42 arranged in each slot 12, half of the element conductors 42 on the inner periphery (the element conductors 42 of the first to fourth layers) are different from the element conductors 42 of the other slots 12. The total number of joints between each of the outer half of the element conductors 42 (the element conductors 42 of the fifth to eighth layers) and the element conductors of the other slots 12 is smaller than that of each of the joints. The three elements that are less than half of the total number of element conductors 4 (=8) in the slot 12 are regarded as an odd number.

In the present embodiment, as described above, the element conductors (legs) 42 arranged in each slot 12 are connected to each other, thereby forming the coils 21X1 to 21X4 of each phase. For example, among the U-phase coils 21U1 and 21U2 connected in series, the coil 21U1 is configured by connecting 48 element conductors 42 according to the pattern shown in FIGS. 11A and 11B , and the coil 21U2 is configured by connecting the 48 element conductors 42 according to the pattern shown in FIGS. 12A and 12B . The pattern is formed by connecting 48 element conductors 42 .

In this case, as shown in FIGS. 11B and 12B , the coils 21U1 and 21U2 are formed in the stator core at intervals of 6 slot pitches, with the waveform winding portion 25 and the overlapping winding portion 26 being formed in the same manner as in the first embodiment. 11 are arranged alternately in the circumferential direction. However, in this embodiment, in the overlapping winding part 26, the two segment coils 41c and 41d in the segment coil group 40 are connected in parallel, and the segment coils 41c and 41d are connected in series with the segment coil 41a. Therefore, the overlapping winding part 26 is substantially formed as a double overlapping winding part 26 similarly to the first embodiment.

In addition, similarly to the first embodiment, the arrangement position of the waveform winding portion 25 of the coil 21U1 and the arrangement position of the overlapping winding portion 26 of the coil 21U2 in the circumferential direction of the stator core 11 are mutually separated within an interval of 6 slot pitches. The coils 21U1 and 21U2 are formed so that the arrangement positions of the overlapping winding portion 26 of the coil 21U1 and the arrangement positions of the waveform winding portion 25 of the coil 21U2 overlap each other within a six-slot pitch interval.

The U-phase coils 21U3 and 21U4 are also configured similarly to the above-mentioned coils 21U1 and 21U2. In this case, the coil 21U3 is formed at a position shifted by an interval of one slot pitch relative to the coil 21U1 toward the negative side in the circumferential direction of the stator core 11 . In addition, the coil 21U4 is formed at a position shifted by one slot pitch relative to the coil 21U2 toward the positive side in the circumferential direction of the stator core 11 .

Coils 21V and 21W of phases other than the U phase (V phase, W phase) are also configured similarly to the U-phase coil 21U. In this case, the V-phase coil 21V is formed at a position shifted by an interval of 4 slot pitches (corresponding to 120° in electrical angle) in the circumferential direction of the stator core 11 relative to the U-phase coil 21U. The coil 21W is formed at a position shifted by an interval of four slot pitches (corresponding to 120° in electrical angle) in the circumferential direction of the stator core 11 relative to the V-phase coil 21V.

In addition, the connection of the coils 21X1 and 21X2 among the coils 21X1 to 21X4 of each phase, the connection of the coils 21X3 and 21X4, and the connection between the coils 21X2, 21X4 and the neutral point 22 are the same as in the first embodiment. conduct.

11A and 12A , it can be seen that the slot 12 in which only the element conductor 42 of any one of the U phase, the V phase, and the W phase is arranged is different from the slot 12 in which the element conductors of the coils of the two phases are arranged four times each. The slots 12 are alternately arranged in the circumferential direction of the stator core 11 .

According to the present embodiment described above, by connecting the two segment coils 41 c and 41 d of each segment coil group 40 in parallel, the two segment coils 41 c and 41 d can be regarded as equivalent to a single segment coil 41 The segmented coils are processed to form each coil of the coils 21X1 to 21X4 of each phase. Therefore, this embodiment can also achieve the same effects as those of the first embodiment.

In each embodiment described above, the case where the number of pole pairs generated by the stator coil 21 is six has been described as an example, but the number of pole pairs may be other than six. In addition, along with this, the total number of slots 12 can be changed, and the spacing in the circumferential direction of the stator core 11 between the linear portions of the two element conductors (legs) 42 and 42 of each segment coil 41 can be changed to be equal to that of the five slots. Groove pitches vary at intervals.

In addition, in each of the above-described embodiments, the case where two adjacent segment coils 41 in the segment coil group 40 are connected in parallel is exemplified. However, the segmented coils 41 in the segmented coil group 40 that are separated in the radial direction of the stator core 11 may also be connected in parallel to each other. For example, the segment coil 41a and the segment coil 41c or 41d may be connected in parallel. However, from the viewpoint of easy connection between the top ends of the bent portions 43 on the second end side of the stator core 11 , it is preferable to connect the adjacent segment coils 41 to each other in parallel.

In addition, the number of element conductors 42 arranged in each slot 12 is not limited to eight, and may be, for example, 12 or more.

Claims (4)

1. A rotating electrical machine having: a stator core in which a plurality of slots are formed in a circumferential arrangement; and multi-phase coils, which are assembled on the stator core, Furthermore, the rotating electrical machine includes a plurality of segmented coils as components of the coils of each phase. Each of the plurality of segmented coils has two element conductors and a connecting portion conductor, and the two element conductors are respectively arranged at respective locations. There are two slots at predetermined intervals in the circumferential direction of the stator core, and one of the two slots is arranged at an inner circumferential position in the radial direction of the stator core, and the other slot is The slot is arranged at a position close to the outer circumference in the radial direction; the connection conductor connects the two element conductors on the first end side of both ends in the axial direction of the stator core, The coils of each phase are coils having a structure in which the top ends of the element conductors of the plurality of segmented coils are joined to each other on the second end side of both ends in the axial direction of the stator core, Furthermore, a predetermined number of element conductors are arranged in each slot of the stator core in the radial direction, and the slots in which only the element conductors of the coils of the same phase among the plural phases are arranged are arranged, and the slots in which two element conductors are arranged are arranged. The predetermined number of element conductors are arranged in such a manner that the slots of the element conductors of the coils of the above phases are alternately arranged in the circumferential direction, The characteristics of the rotating electrical machine are that, The predetermined number, that is, the number of element conductors arranged in each of the slots, is set to an even number that is half of the predetermined number, Among the predetermined number of element conductors arranged in each of the slots, half of the element conductors on the inner circumference have a total number of joints between each of the element conductors of other slots, and half of the element conductors on the outer circumference The total number of joints between each of the element conductors and the element conductors of other slots is an odd number smaller than half of the predetermined number of element conductors that are respectively joined to the element conductors of other slots. 2. The rotating electrical machine according to claim 1, characterized in that, The total number of joints between each of the inner circumferential half of the element conductors of the predetermined number of element conductors arranged in each slot and the element conductors of other slots is less than half of the predetermined number. An odd number of 1. 3. The rotating electrical machine according to claim 1 or 2, characterized in that, The coils of each phase are provided with a segmented coil pair of two segmented coils adjacent in the radial direction and connected in parallel with each other at certain intervals in the circumferential direction. The element conductors of the segmented coils are joined to each other on the second end side. 4. The rotating electrical machine according to claim 3, characterized in that, The two segment coils constituting each pair of segment coils each include an element conductor closest to the inner circumference in the radial direction and an element conductor adjacent to the element conductor in the radial direction. Segmented coil.