CN112953068B - Rotary electric machine - Google Patents

Abstract

The invention aims to provide a rotary motor capable of realizing the improvement of output and output torque in a mode of restraining the increase of manufacturing cost. In a plurality of slots (12) of a stator core (11), element conductors (leg portions) (42) of a plurality of two-strand-shaped segmented coils (41) are arranged so as to be aligned in the radial direction of the stator core (11), and tip portions (43) of the element conductors (42) are joined to each other to constitute coils (21X) of respective phases. The number of element conductors (42) arranged in each slot (12) is an odd number divided by 2. The bending amount of the tip end part (43) of 1 element conductor (42) in the element conductors (42) arranged in each slot (12) is different from the bending amount of the tip end parts (43) of other element conductors (42).

Description

Rotary electric machine

Technical Field

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

Background

Conventionally, as seen in patent document 1, for example, a rotary electric machine is known that includes a coil having a structure in which a plurality of segment coils formed in a two-strand shape (substantially U-shaped) and composed of conductor wires are connected in series as coils mounted in each phase of a stator core.

In this rotary electric machine, element conductors, which are 2 legs of the segment coil, are inserted from one end side in the axial direction of the stator core into each pair of 2 slots having a constant interval in the circumferential direction of the stator core, among a plurality of slots formed in the inner peripheral portion of the stator core so as to be arranged at a constant interval in the circumferential direction. 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 2 element conductors (leg portions) 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. One element conductor of each segment coil is disposed in one of the 2 slots of each pair at a position near the inner periphery of the stator core, and the other element conductor is disposed in the other slot at a position near the outer periphery of the stator core. In each slot, element conductors of each of the 8 segment coils are inserted so that 4 element conductors are arranged at positions near the outer circumference of the stator core in the radial direction of the stator core and 4 element conductors are arranged at positions near the inner circumference of the stator core in the radial direction of the stator core.

The distal end portion of each element conductor (leg portion) protruding toward the other end side in the axial direction of the stator core is bent in the circumferential direction of the stator core (hereinafter, the distal end portion is referred to as a bent portion). In this case, the bending amounts of the bending portions of the element conductors (the intervals from the straight portions of the element conductors disposed in the slots to the tip end portions of the bending portions (intervals in the circumferential direction of the stator core)) are identical to each other.

Prior art literature

Patent literature

Patent document 1: japanese patent application laid-open No. 2015-23670

Disclosure of Invention

Problems to be solved by the invention

In the rotating electric machine disclosed in patent document 1, 8 element conductors (leg portions of the segment coil) are arranged in each slot, but there are cases where the number of element conductors arranged in each slot is required to be smaller or larger than 8 for the purpose of improving the output (output energy per unit time) or the output torque of the rotating electric machine.

In this case, the number of element conductors arranged in each slot can be changed to various numbers by changing the structure of the stator coil. However, from the viewpoint of suppressing the manufacturing cost of a stator in which a stator coil is assembled to a stator core, it is desirable that a stator having different numbers of element conductors arranged in respective slots can be manufactured without changing the production equipment of a conventional rotating electrical machine as seen in patent document 1.

The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a rotary electric machine capable of achieving an improvement in output and output torque while suppressing an increase in manufacturing cost.

Means for solving the problems

In order to achieve the above object, a rotary electric machine according to the present invention includes:

A stator core formed such that a plurality of slots are arranged in a circumferential direction; and

A multiphase coil mounted to the stator core,

The rotating electric machine includes a plurality of segment coils as constituent elements of coils of respective phases, each of the plurality of segment coils having 2 element conductors and a connecting portion conductor, the 2 element conductors being disposed in 2 slots having a predetermined interval in a circumferential direction of the stator core, one of the 2 slots being disposed at a position closer to an inner circumference in a radial direction of the stator core, and the other slot being disposed at a position closer to an outer circumference in the radial direction; the connecting portion conductor connects the 2 element conductors at a first end side of both ends of the stator core in an axial direction, the coil of each phase is a coil having a structure in which tip ends of the element conductors of the plurality of segment coils are joined to each other in a state in which the tip ends of the element conductors of the plurality of segment coils are bent in the circumferential direction at a second end side of both ends of the stator core in an axial direction,

In each slot of the stator core, a predetermined number of element conductors are arranged in the radial direction, and the predetermined number of element conductors are arranged so that slots in which only element conductors of coils of the same phase among the plurality of phases are arranged and slots in which element conductors of coils of two or more phases are arranged are alternately arranged in the circumferential direction,

It is characterized in that the method comprises the steps of,

The predetermined number, which is the number of element conductors arranged in each slot, is set to an even number obtained by dividing the predetermined number by 2,

The bending amount of 1 element conductor in the circumferential direction of the predetermined number of element conductors in each slot is set to a value different from the bending amount of the tip end portion of the other element conductor in the circumferential direction of the predetermined number of element conductors.

In the present invention, the "bending amount" of the element conductor means a distance in the circumferential direction (circumferential direction of the stator core) between a portion of the element conductor disposed in the slot and the tip end of the element conductor in more detail.

Here, the present inventors have obtained the following findings through various studies: when the predetermined number is an even number (for example, 6 or 10) obtained by dividing the predetermined number by 2, the bending amount of 1 element conductor in the circumferential direction of the predetermined number of element conductors in each slot is set to a value different from the bending amount of the tip end portions of the other element conductors in the circumferential direction of the predetermined number of element conductors, and thus, a plurality of segment coils having the same shape (two-strand shape) as in the related art described in patent document 1 or the like can be used to construct coils of each phase by bonding the tip end portions of the element conductors of the plurality of segment coils to each other.

Thus, the present invention is constructed as described above. In this case, since the coil of each phase can be configured using a plurality of segment coils having the same shape (two-strand shape) as in the conventional art, a large number of conventional production facilities can be utilized without requiring a large change in specifications. For example, conventional machines can be used as a machine for inserting element conductors as leg portions of each segment coil into slots of a stator core, a machine for bending tip portions of the element conductors of the segment coil, and a machine for bonding bent tip portions of the element conductors to each other. Therefore, the stator in which the coils of each phase are assembled to the stator core can be manufactured at low cost.

If the predetermined number is set to be smaller than the conventional number within the range satisfying the above condition, the output (output energy per unit time) of the rotating electrical machine can be set to be higher than the conventional number. Further, if the predetermined number is set to be larger than the conventional one within a range satisfying the above condition, the maximum torque that can be output from the rotating electrical machine can be set to be higher than the conventional one.

Thus, according to the present invention, the output and the output torque can be improved while suppressing an increase in manufacturing cost.

In the present invention, when the predetermined number is defined as X, it is preferable that 1 element conductor out of the predetermined number is the (X/2+1) th element conductor in the radial direction from any one element conductor out of the element conductors located at the outermost periphery and the element conductor located at the innermost periphery.

This enables the joining portions to be arranged so that the distal end portions of the element conductors on the second end side of the stator core can be appropriately joined to each other.

In the present invention, it is preferable that the bending amount of 1 element conductor among the predetermined number of element conductors in the circumferential direction is set to a value at which the bending amount of the tip end portion of the other element conductor among the predetermined number of element conductors in the circumferential direction is short.

Accordingly, the bending angle (bending angle with respect to the axial direction of the stator core) of the 1-element operation can be suppressed to a small angle as compared with the case where the bending amount of the 1-element conductor is set to a long value. Further, the processing unit is used for processing the data, the stress generated in the portion (bent portion) where the 1 element conductor is bent at the second end side of the stator core can be reduced.

In the present invention, it is preferable that, when the coils of the respective phases are constituted by a first coil and a second coil connected in parallel, element conductors of the first coil and element conductors of the second coil are arranged in the slots adjacent in the circumferential direction.

Thus, the coil of each phase can be configured as a coil in which the first coil and the second coil are connected in parallel, and the current that can be supplied to the coil of each phase can be increased.

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 configuration of the stator coil of the rotating electrical machine according to the first embodiment.

Fig. 3 is a diagram showing the arrangement of element conductors constituting coils of respective phases in the first embodiment.

Fig. 4A is a perspective view of the segment coil in the first embodiment when the segment coil is viewed from the connection portion conductor side, fig. 4B is a perspective view of the segment coil when the segment coil is viewed from the tip portion (bent portion) side of the element conductor, and fig. 4C is a view showing a bundle of conductor wires for producing the segment coil.

Fig. 5 is a diagram illustrating the arrangement and connection of element conductors of a segmented coil of each phase coil in the first embodiment.

Fig. 6A is a diagram illustrating 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 connection of element conductors of the part of the U-phase coil.

Fig. 7A is a diagram illustrating arrangement and connection of element conductors of a part of the U-phase coil in the first embodiment, and fig. 7B is a diagram illustrating connection of element conductors of the part of the U-phase coil.

Fig. 8 is a circuit diagram showing the overall circuit configuration of a stator coil of the rotary electric machine according to the second embodiment.

Fig. 9 is a diagram illustrating the arrangement and connection of element conductors of a segmented coil of each phase coil in the second embodiment.

Fig. 10 is a diagram illustrating an arrangement and connection pattern of element conductors of a part of a U-phase coil in the second embodiment.

Fig. 11 is a diagram illustrating a form of connection of element conductors of the coil shown in fig. 10.

Fig. 12 is a diagram illustrating an arrangement and connection pattern of element conductors of a part of the U-phase coil in the second embodiment.

Fig. 13 is a diagram illustrating a form of connection of element conductors of the coil shown in fig. 12.

Fig. 14 is a diagram illustrating the arrangement and connection of element conductors of a segmented coil of each phase coil in the third embodiment.

Fig. 15A is a diagram illustrating a configuration of arrangement and connection of element conductors of a part of a U-phase coil in the third embodiment, and fig. 15B is a diagram illustrating a configuration of connection of element conductors of the part of the U-phase coil.

Fig. 16 is a diagram illustrating the arrangement and connection of element conductors of a segmented coil of each phase coil in the fourth embodiment.

Fig. 17A is a diagram illustrating a configuration of arrangement and connection of element conductors of a part of a U-phase coil in the fourth embodiment, and fig. 17B is a diagram illustrating a configuration of connection of element conductors of the part of the U-phase coil.

Fig. 18 is a diagram illustrating the arrangement and connection of element conductors of a segmented coil of each phase coil in the fifth embodiment.

Fig. 19A is a diagram illustrating a configuration of arrangement and connection of element conductors of a part of a U-phase coil in the fifth embodiment, and fig. 19B is a diagram illustrating a configuration of connection of element conductors of the part of the U-phase coil.

Reference numerals illustrate:

A stator core, 12..slots, 21U, 21V, 21W, 31U, 31V, 31 w..coils, 21U1, 21U2, 31U1 to 31U 4..first coils, 21U3, 21U4, 31U5 to 31U 8..second coils, 41..segmented coils, 42..element conductors, 43..bent portions (tip portions of element conductors), 44..connection portion conductors.

Detailed Description

First embodiment

A first embodiment of the present invention will be described below with reference to fig. 1 to 7B. The rotary electric machine of the present embodiment includes a substantially cylindrical stator core 11 disposed 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 in the inner peripheral portion of the stator core 11 so as to be arranged at regular intervals in the circumferential direction of the stator core 11 (the axial direction of the stator core 11). Each slot 12 is formed so as to penetrate the stator core 11 in the axial direction thereof.

As shown in fig. 2, the stator coil 21 is composed of three-phase coils, i.e., a U-phase coil 21U, V-phase coil 21V and a W-phase coil 21W. In the following description, when it is not necessary to distinguish between the U phase, the V phase, and the W phase, the reference numerals of the constituent elements corresponding to any 1 are given "X". For example, 1 coil out of the U-phase coil 21U, V-phase coil 21V and W-phase coil 21W is referred to as a coil 21X. In this case, "X" means any one of U, V, W.

In the present embodiment, the coil 21X of each phase is configured by connecting a coil in which 2 coils 21X1 and 21X2 are connected in series and a coil in which 2 coils 21X3 and 21X4 are connected in series in parallel. The U-phase, V-phase, and W-phase coils 21U, 21V, and 21W have one ends connected to each other at a neutral point 22. The other end of the coil 21X of each phase is connected to a current input/output terminal 23X of an input/output unit for supplying current to the coil 21X for each phase.

Each of the coils 21X1 to 21X4 of each phase includes, as a partial constituent element thereof, a plurality of (a predetermined number of) element conductors 42 respectively arranged in the slot 12 as shown in fig. 3. Each element conductor 42 is a portion corresponding to one of the 2 legs of the segmented coil 41 formed in a two-beam shape (substantially U-shaped), and will be described in detail later.

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

In fig. 3, the axial direction of the stator core 11 is set to be perpendicular to the paper surface, the circumferential direction of the stator core 11 is set to be transverse, the radial direction of the stator core 11 is set to be longitudinal, and each element conductor 42 is described as viewed in the axial direction of the stator core 11. In this case, the element conductors 42 of the coils 21X1 and 21X2 in the coils 21X1 to 21X4 of each phase are indicated by gray, and the element conductors 42 of the coils 21X3 and 21X4 are indicated by white.

In fig. 3, numerals (13U, 66W, etc.) attached to the element conductors 42 indicate the connection order (conduction order) of the element conductors 42 from the current input/output terminal 23X to the neutral point 22, and U, V, W in the numeral indicates which of the U-, V-, and W-phases the element conductor 42 belongs to. The arrangement and connection order of the element conductors 42 shown in fig. 3 are shown in the case of looking from one axial end side (first end side described later) of the stator core 11.

In the present embodiment, the pole pair number (the number of pairs of N and S poles) of the magnetic poles generated by the stator coil 21 is set to 6 pole pairs (12 poles in total), for example. As described above, the number of phases of the stator coil 21 is three, and the coils 21X of each phase are configured by connecting in parallel a coil formed by connecting the coils 21X1 and 21X2 in series and a coil formed by connecting the coils 21X3 and 21X4 in series. The coils 21X1 and 21X2 correspond to the first coil in the present invention, and the coils 21X3 and 21X4 correspond to the second coil in the present invention.

Therefore, in the present embodiment, as shown in fig. 3, the number N of slots per 1 pole is set to n=3×2=6. A total of 72 (=6×12) slots 12 are formed in the stator core 11. In each slot 12, 6 element conductors 42 are arranged in 6 layers aligned in the radial direction of the stator core 11.

In the present embodiment, the coils 21X1 to 21X4 of each phase have 36 element conductors 42 (1 st to 36 th element conductors 42 or 37 th to 72 th element conductors 42). The coils 21X1 to 21X4 of the respective phases are each configured by connecting 36 element conductors 42 inserted into the slots 12 in series so as to be electrically connected in the order of numbers shown in fig. 3.

Since the coils 21X1 and 21X2 of the coils 21X1 to 21X4 of each phase are connected in series, the connection order of the element conductors 42 of the coil 21X1 is denoted by 1 to 36 and the connection order of the element conductors 42 of the coil 21X2 is denoted by 37 to 72 in fig. 3. Similarly, the connection order of the element conductors 42 of the coil 21X3 is denoted by 1 to 36, and the connection order of the element conductors 42 of the coil 21X4 is denoted by 37 to 72.

Hereinafter, a more specific connection structure of the coils 21X1 to 21X4 of each phase will be described in detail. In the following description, the arrangement positions of the 6 element conductors 42 inserted into the slots 12 in the radial direction of the stator core 11 are referred to as a first layer, a second layer, a third layer, and a sixth layer from the inside (inner peripheral side) to the outside (outer peripheral side) in the radial direction of the stator core 11.

A predetermined one of the 2 directions of the clockwise direction and the counterclockwise direction in the circumferential direction of the stator core 11 is referred to as a circumferential positive side, and a direction opposite to the predetermined one is referred to as a circumferential negative side. In the description of the present embodiment, for convenience, the positive side in the circumferential direction is defined as the rightward direction in fig. 3, and the negative side in the circumferential direction is defined as the leftward direction in fig. 3.

In the present embodiment, as shown in fig. 4A, 2 element conductors 42, 42 disposed in 2 slots 12, 12 having a predetermined interval in the circumferential direction of the stator core 11 are formed as 2 leg portions of a segment coil 41 formed of conductor wires formed in a two-strand shape (substantially U-shaped). Hereinafter, the element conductor 42 is sometimes referred to as a leg 42.

In the present embodiment, a bundle of 3 segment coils 41 is produced as 1-group coil units 40 (hereinafter referred to as a segment coil unit 40). Fig. 4A is a perspective view of the segment coil assembly 40 when the segment coil 41 is viewed from the head side (the side of the connecting portion conductor 44 described later).

As shown in fig. 4C, the segmented coil assembly 40 is manufactured by bending a conductor harness in which 3 conductor wires 40a, 40b, 40C are connected in parallel with each other in an insulated manner into a two-strand shape (a substantially U-shape) as shown in fig. 4A. Thereby, each of the 3 conductor wires 40a, 40b, 40c is processed into a segmented coil 41 in a two-strand shape.

Each segment coil 41 formed in a two-beam shape (substantially U-shaped) in this way has 2 leg portions (element conductors) 42, 42 extending linearly parallel to each other and a connecting portion conductor 44 as a portion connecting the base end side ends of the leg portions 42, 42 to each other in an integrated structure.

In this case, the segment coil 41 is formed such that 2 leg portions (element conductors) 42, 42 thereof have a pitch of 5 slots in the circumferential direction of the stator core 11 and have a pitch of 3 layers in the radial direction of the stator core 11. In the present specification, a 1 slot pitch means an interval of 2 slots 12, 12 (an angular difference in the stator core 11 around the axial direction) adjacent to each other in the circumferential direction of the stator core 11, and an n slot pitch means an interval of n times the 1 slot pitch. When the total number of slots 12 is 72, 1 slot pitch corresponds to an angular difference of 5 ° in the axial direction of the stator core 11.

As illustrated in the 10 th slot 12 and the 15 th slot 12 of fig. 5, the 3 segment coils 41 of each segment coil group 40 formed as described above are inserted so that the bundle of 3 legs 42 on one side and the bundle of 3 legs 42 on the other side of the segment coil group 40 penetrate from one end side to the other end side in the axial direction of the stator core 11 toward the pair of 2 slots 12, 12 composed of 1 slot 12 and another slot 12 having a space of 5 slot pitch with respect to the slot 12.

In this case, in the slot 12 (for example, 10 th slot in fig. 5) on one side (circumferential negative side) of the pair of 2 slots 12, 3 leg portions (element conductors) 42 are arranged in the fourth, fifth, and sixth layers on the outer side in the radial direction of the stator core 11, and in the slot 12 (for example, 15 th slot in fig. 5) on the other side (circumferential positive side), 3 leg portions 42 are arranged in the first, second, and third layers on the inner side in the radial direction of the stator core 11.

Thus, 3 legs 42 on one side and 3 legs 42 on the other side of the segment coil group 40 are inserted into each pair of slots 12, 12 constituted by each slot 12 of the stator core 11 and the slots 12 having a pitch of 5 slots in the circumferential direction of the stator core 11 with respect to the slot 12.

As a result, in each slot 12, as shown in fig. 3, 6 element conductors (leg portions) 42 are arranged in 6 layers in the radial direction of the stator core 11. Therefore, the number (=6) of the element conductors 42 arranged in each slot 12 is an even number, which is an odd number, divided by 2 (=3).

The connection conductor 44 of each segment coil 41 is disposed at one end side in the axial direction of the stator core 11. In the following description, one side of the two ends of the stator core 11 in the axial direction, on which the connection conductors 44 of the respective segment coils 41 are arranged, is referred to as a first end, and the opposite side is referred to as a second end.

The distal end portions of the leg portions (element conductors) 42 of the respective segment coils 41 protruding toward the second end side in the axial direction of the stator core 11 are bent in the circumferential direction of the stator core 11 as shown in fig. 4B and 5 so as to be connected to the distal end portions of the other leg portions 42. Hereinafter, the distal end portion of each leg portion 42 thus bent is referred to as a bending portion 43.

Fig. 4B is a perspective view of the segment coil assembly 40 when the segment coil 41 is viewed from the distal end side (the bent portion 43 side) of each leg portion 42. In fig. 5, the bent portion 43 is shown by a broken line.

In this case, in the present embodiment, the plurality of element conductors (leg portions) 42 constituting the coils 21X1 to 21X4 of each phase are connected so that the coils 21X1 to 21X4 of each phase can alternately generate magnetic poles of the N pole and the S pole every 6 slot pitches in the circumferential direction of the stator core 11. Therefore, in the present embodiment, the bending direction of the bending portion 43 of each leg portion 42 of each segment coil 41 connected to the straight portion (portion disposed in the slot 12) in the circumferential direction of the stator core 11 and the bending amount in the circumferential direction (specifically, the interval in the circumferential direction between the straight portion of the leg portion 42 and the tip end of the bending portion 43 connected thereto) are set as follows.

That is, referring to the segment coil groups 40 shown in fig. 4B and 5 (segment coil groups 40 having connection conductors 44 between the 10 th slot 12 and the 15 th slot 12), the bent portions 43 of the legs 42 of the first and third layers of each segment coil group 40 are bent in the circumferential direction of the stator core 11 from the slot 12 in which the straight portions of the legs 42 are arranged toward the same side (the circumferential negative side in fig. 5) as the slot 12 in which the legs 42 of the fourth to sixth layers of the segment coil group 40 are arranged.

The bent portions 43 of the leg portions 42 of the second layer of each segment coil group 40 are bent in the circumferential direction of the stator core 11 from the slots 12 in which the leg portions 42 are arranged toward the side (the circumferential positive side in fig. 5) opposite to the bending direction of the bent portions 43 of the leg portions 42 of the first and third layers.

The bent portions 43 of the leg portions 42 of the fourth and sixth layers of each segment coil group 40 are bent in the circumferential direction of the stator core 11 in the same direction (the circumferential positive side in fig. 5) as the bent portions 43 of the leg portions 42 of the second layer.

The bent portions 43 of the fifth-layer leg portions 42 of each segment coil group 40 are bent in the circumferential direction of the stator core 11 in the same direction (the negative side in the circumferential direction in fig. 5) as the bending direction of the bent portions 43 of the first-layer and third-layer leg portions 42.

As described above, the bent portions 43 of the leg portions 42 of the odd-numbered layers (first, third, and fifth layers) and the bent portions 43 of the leg portions 42 of the even-numbered layers (second, fourth, and sixth layers) of the segment coil assembly 40 are bent in opposite directions in the circumferential direction of the stator core 11. In this case, the bent portions 43 of the leg portions 42 of the third and fourth layers are bent in directions approaching each other.

In the present embodiment, the bending amounts of the bending portions 43 of the leg portions 42 of the segment coil groups 40 (the bending amounts in the circumferential direction of the stator core 11) are equal to each other in the first, second, fifth, and sixth layers, and are equal to each other in the bending amounts of the bending portions 43 of the leg portions 42 of the segment coil groups 40, and are equal to each other in the bending amounts of one half of the 6 slot pitch (that is, the 3 slot pitch interval).

In addition, regarding the bending amounts of the bending portions 43 of the leg portions 42 of the third layer and the fourth layer, the bending amounts of the bending portions 43 of the leg portions 42 of any one of the third layer and the fourth layer, for example, the third layer are the same as the bending amounts of the bending portions 43 of the leg portions 42 of the first layer, the second layer, the fifth layer, and the sixth layer (3 pitch interval).

On the other hand, the bending amount of the bending portion 43 of the leg portion 42 of the other layer (in the present embodiment, the fourth layer) of the third layer and the fourth layer is shorter than the bending amount of the bending portion 43 of the leg portion 42 of each other layer, and is the bending amount of the interval of 2 slot pitch. Therefore, the bending amounts of the bending portions 43 of the leg portions 42 of the third and fourth layers are set so that the sum of the bending amounts matches the interval (interval in the circumferential direction of the stator core 11) between the 3 leg portions 42 (the leg portions 42 of the first to third layers) on one side and the 3 leg portions 42 (the leg portions 42 of the fourth to sixth layers) on the other side of the segment coil group 40, that is, the interval of 5 slot pitches.

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

Next, in order to describe the connection structure between the bent portion 43 of each leg portion 42 and the bent portion 43 of the other leg portion 42 of each segment coil group 40, for convenience of description, 1 segment coil group 40 is focused on, and the segment coil group 40 is referred to as a focused segment coil group 40. Each leg 42 of the eye-segmented coil set 40 is referred to as an eye-leg 42. For example, in fig. 5, the segment coil group 40 having the connection portion conductor 44 between the 10 th slot 12 and the 15 th slot 12 is referred to as an eye segment coil group 40.

In this case, referring to fig. 5, it is apparent that the distal end portion of the bent portion 43 of the eye leg portion 42 of the first layer of the eye segment coil group 40 is adjacent to the distal end portion of the bent portion 43 of the second layer of the leg portion 42 arranged from the slot 12 in which the eye leg portion 42 of the first layer is arranged to the slot 12 having a pitch of 6 slots on the same side (circumferential negative side) as the bent portion 43 (in other words, the leg portion 42 of the second layer of the other segment coil group 40 arranged from the eye segment coil group 40 to the circumferential negative side having a pitch of 6 slots) in the radial direction of the stator core 11. Then, the distal end portions of the bent portions 43 of the eye leg portions 42 of the first layer of the eye-segment coil group 40 and the distal end portions of the bent portions 43 of the leg portions 42 of the second layer of the other segment coil group 40 having a pitch of 6 slots on the circumferential negative side from the eye-segment coil group 40 are joined by welding or the like.

The distal end portions of the bent portions 43 of the eye leg portions 42 of the second layer of the eye segment coil groups 40 are adjacent to the distal end portions of the bent portions 43 of the first layer of the leg portions 42 arranged from the slot 12 in which the eye leg portions 42 of the second layer are arranged to the slot 12 having a pitch of 6 slots on the same side (circumferential positive side) as the bent portions 43 (in other words, the leg portions 42 of the first layer of the other segment coil groups 40 arranged to have a pitch of 6 slots on the circumferential positive side from the eye segment coil groups 40) in the radial direction of the stator core 11. Then, the distal end portions of the bent portions 43 of the eye leg portions 42 of the second layer of the eye segment coil group 40 and the distal end portions of the bent portions 43 of the leg portions 42 of the first layer of the other segment coil group 40 having a pitch of 6 slots on the circumferential positive side from the eye segment coil group 40 are joined by welding or the like.

The distal end portions of the bent portions 43 of the eye-leg portions 42 of the third layer of the eye-segment coil group 40 are adjacent to the distal end portions of the bent portions 43 of the eye-leg portions 42 of the fourth layer of the eye-segment coil group 40 in the radial direction of the stator core 11. Then, the distal ends of the bent portions 43 of the respective eye-leg portions 42 of the third and fourth layers of the eye-segment coil groups 40 are joined to each other by welding or the like.

The distal end portion of the bent portion 43 of the eye leg portion 42 of the fifth layer of the eye segment coil group 40 is adjacent to the distal end portion of the bent portion 43 of the sixth layer of the leg portion 42 arranged from the slot 12 in which the eye leg portion 42 of the fifth layer is arranged to the slot 12 having a pitch of 6 slots on the same side (circumferential negative side) as the bent portion 43 (in other words, the leg portion 42 of the sixth layer of the other segment coil group 40 arranged to have a pitch of 6 slots on the circumferential negative side from the eye segment coil group 40) in the radial direction of the stator core 11. Then, the distal end portion of the bent portion 43 of the eye leg portion 42 of the fifth layer of the eye segment coil group 40 and the distal end portion of the bent portion 43 of the leg portion 42 of the sixth layer of the other segment coil group 40 having a pitch interval of 6 slots from the eye segment coil group 40 to the circumferential negative side are joined by welding or the like.

The distal end portion of the bent portion 43 of the eye leg portion 42 of the sixth layer of the eye segment coil group 40 is adjacent to the distal end portion of the bent portion 43 of the fifth layer of the leg portion 42 arranged from the slot 12 in which the eye leg portion 42 of the sixth layer is arranged to the slot 12 having a pitch of 6 slots on the same side (circumferential positive side) as the bent portion 43 (in other words, the leg portion 42 of the fifth layer of the other segment coil group 40 arranged to have a pitch of 6 slots on the circumferential positive side from the eye segment coil group 40) in the radial direction of the stator core 11. Then, the distal end portion of the bent portion 43 of the eye leg portion 42 of the sixth layer of the eye segment coil group 40 and the distal end portion of the bent portion 43 of the leg portion 42 of the fifth layer of the other segment coil group 40 having a pitch of 6 slots on the circumferential positive side from the eye segment coil group 40 are joined by welding or the like.

In the present embodiment, as described above, the distal end portion of the bent portion 43 of each leg portion (element conductor) 42 of each segment coil group 40 is joined to the distal end portion of the bent portion 43 of the other leg portion 42 of the layer adjacent thereto.

More specifically, the distal ends of the bent portions 43 of the 2 leg portions (element conductors) 42 arranged in the first and second layers of each of the 2 slots 12, 12 having the pitch of 6 slots are joined to each other. In this case, the segment coil groups 40 having the leg portions 42 of the first layer and the segment coil groups 40 having the leg portions 42 of the second layer are mutually different segment coil groups 40 arranged with a pitch of 6 slots in the circumferential direction of the stator core 11.

Further, the distal ends of the bent portions 43 of the 2 leg portions (element conductors) 42 arranged in the fifth layer and the sixth layer of each of the 2 slots 12, 12 having the pitch of 6 slots are joined to each other. In this case, the segment coil groups 40 having the leg portions 42 of the fifth layer and the segment coil groups 40 having the leg portions 42 of the sixth layer are mutually different segment coil groups 40 arranged with a pitch of 6 slots in the circumferential direction of the stator core 11.

Further, the distal ends of the bent portions 43 of the 2 leg portions (element conductors) 42 arranged in the third and fourth layers of each of the 2 slots 12, 12 having the pitch of 5 slots are joined to each other. In this case, the leg 42 of the third layer and the leg 42 of the fourth layer are included in the leg 42 of the common segment coil group 40.

As described above, the element conductors (legs) 42 disposed in the slots 12 are connected to each other to form the coils 21X1 to 21X4 of the respective phases. For example, the coil 21U1 of the U-phase series-connected coils 21U1, 21U2 is configured by connecting 36 element conductors 42 (element conductors 42 numbered 1 to 36) in series in a pattern shown in fig. 6A and 6B, and the coil 21U2 is configured by connecting 36 element conductors 42 (element conductors 42 numbered 37 to 72) in series in a pattern shown in fig. 7A and 7B. Fig. 6B and 7B show the connection pattern of the element conductors 42 with the lateral direction being the circumferential direction of the stator core 11 and the longitudinal direction being the axial direction of the stator core 11.

In this case, as shown in fig. 6B and 7B, the coils 21U1 and 21U2 are formed such that the wave-shaped winding portions 25 and the double-wound overlap winding portions 26 are alternately arranged at intervals of 6 slot pitches in the circumferential direction of the stator core 11. In this case, the coils 21U1 and 21U2 are configured such that the arrangement position of the wave-shaped winding portion 25 of the coil 21U1 and the arrangement position of the overlap winding portion 26 of the coil 21U2 in the circumferential direction of the stator core 11 overlap each other at intervals of 6 slot pitches, and the arrangement position of the overlap winding portion 26 of the coil 21U1 and the arrangement position of the wave-shaped winding portion 25 of the coil 21U2 overlap each other at intervals of 6 slot pitches.

The U-phase coils 21U3 and 21U4 are also configured in the same manner as the coils 21U1 and 21U 2. In this case, the coil 21U3 is formed at a position offset from the coil 21U1 by a pitch of 1 slot toward the circumferential negative side of the stator core 11. In addition, the coil 21U4 is formed at a position offset from the coil 21U2 by a pitch of 1 slot toward the circumferential positive side of the stator core 11.

The other phase (V-phase, W-phase) coils 21V, 21W than the U-phase are also configured in the same manner as the U-phase coil 21U. In this case, the V-phase coil 21V is formed at a position offset from the U-phase coil 21U by a pitch of 4 slots (corresponding to 120 ° in the electrical angle) in the circumferential direction of the stator core 11, and the W-phase coil 21W is formed at a position offset from the V-phase coil 21V by a pitch of 4 slots (corresponding to 120 ° in the electrical angle) in the circumferential direction of the stator core 11.

In this case, referring to fig. 3, 6A and 7A, slots 12 in which only element conductors 42 of any 1 of the U phase, V phase and W phase are arranged and slots 12 in which element conductors of 2 phases of coils are arranged in each of 3 phases are alternately arranged in the circumferential direction of stator core 11.

The coils 21X1 and 21X2 of the coils 21X1 to 21X4 of each phase are connected in series via, for example, a bridge conductor not shown. The same applies to the connection of the coils 21X3 and 21X 4. The neutral point 22 side end portions of the coils 21X2 and 21X4 are connected to, for example, a conductor plate, not shown, that forms the neutral point 22.

According to the present embodiment described above, since the coil 21X of each phase can be configured using the plurality of segmented coils 41 having the same shape (two-strand shape) as in the conventional art, a large number of conventional production facilities can be utilized without requiring a large change in specifications. For example, conventional machines can be used as a machine for inserting the leg portions (element conductors) 42 of the respective segment coils 41 into the slots 12 of the stator core 11, a machine for bending the tip ends of the leg portions (element conductors) 42 of the segment coils 41, and a machine for joining the bent portions 43 of the leg portions (element conductors) 42 to each other. Therefore, the stator in which the coils 21X of each phase are assembled to the stator core 11 can be manufactured at low cost.

Since the number of element conductors 42 arranged in each slot 12 is 6, the output (output energy per unit time) of the rotating electrical machine can be increased as compared with the case where the number is 8 as in the conventional case.

Second embodiment

Next, a second embodiment of the present invention will be described with reference to fig. 8 to 13. In this embodiment, since only the connection structure of the stator coil is different from that of the first embodiment, the description of the same matters as those of the first embodiment is omitted.

As shown in fig. 8, the stator coil 31 of the present embodiment is configured by three-phase coils, i.e., a U-phase coil 31U, V-phase coil 31V and a W-phase coil 31W. In the present embodiment, the coil 31X (x=u or V or W) of each phase is configured by connecting in parallel a coil in which 4 coils 31X1, 31X2, 31X3, 31X4 are connected in series and a coil in which other 4 coils 31X5, 31X6, 31X7, 31X8 are connected in series. The coils 31X1 to 31X4 correspond to the first coil in the present invention, and the coils 31X5 to 31X8 correspond to the second coil in the present invention.

The U-phase, V-phase, and W-phase coils 31U, 31V, and 31W have one ends connected to each other at a neutral point 32. The other end of each phase coil 31X is connected to a current input/output terminal 33X of an input/output unit for supplying current to the coil 31X for each phase.

Each of the coils 31X1 to 31X8 of each phase includes, as a partial component thereof, a plurality of (a predetermined number of) element conductors 42 respectively arranged in the slot 12 as shown in fig. 9. Each element conductor 42 is a portion corresponding to one leg 42 of the 2 legs of the segmented coil 41 formed in a two-beam shape (substantially U-shaped) as in the first embodiment. Each of the coils 31X1 to 31X8 of each phase is formed by connecting a plurality of (predetermined number of) element conductors (legs) 42 in series.

In the present embodiment, the total number of slots 12 of the stator core 11 and the pole pair number of the magnetic poles generated by the stator coil 31 are the same as those in the first embodiment (72 pole pairs and 6 pole pairs, respectively). The number of the element conductors 42 constituting the coils 31X1 to 31X8 of each phase is 30, for example.

In each slot 12, the element conductors 42 are arranged in a plurality of layers in the radial direction of the stator core 11, as in the first embodiment. However, in the present embodiment, the number of element conductors 42 in each slot 12 is 10, and the 10 element conductors 42 are arranged so as to be aligned in the radial direction of the stator core 11. Therefore, the number (=10) of element conductors 42 arranged in each slot 12 is an even number, which is an odd number, divided by 2 (=5).

Hereinafter, the arrangement positions of the 10 element conductors 42 inserted into the slots 12 in the radial direction of the stator core 11 are referred to as a first layer, a second layer, a third layer, and a fourth layer from the inside (inner peripheral side) to the outside (outer peripheral side) in the radial direction of the stator core 11.

In the present embodiment, as shown in fig. 9, a bundle of 5 segmented coils 41 is produced as a 1-component segmented coil set 40'. The respective segment coils 41 of the segment coil group 40' are formed in a two-strand shape (substantially U-shaped) as in the first embodiment. However, in the present embodiment, each segment coil 41 is formed such that 2 legs (element conductors) 42, 42 thereof have a pitch of 5 slots in the circumferential direction of the stator core 11 and have a pitch of 5 layers in the radial direction of the stator core 11. Therefore, the intervals between the 2 leg portions (element conductors) 42 and 42 of the segment coil 41 according to the present embodiment are the same as those in the first embodiment in the circumferential direction of the stator core 11, but the intervals in the radial direction of the stator core 11 are different from those in the first embodiment.

As exemplified in relation to the 35 th slot 12 and the 40 th slot 12 in fig. 9, the 5 segment coils 41 of each segment coil group 40 'formed as described above are inserted so that the bundles of the 5 legs 42 on one side and the bundles of the 5 legs 42 on the other side of the segment coil group 40' penetrate from one end side (first end side) to the other end side (second end side) in the axial direction of the stator core 11 toward the pair of 2 slots 12, 12 composed of 1 slot 12 and another slot 12 having a space of 5 slot pitch with respect to the slot 12.

In this case, in the slot 12 (35 th slot in fig. 9, for example) on one side (the circumferential negative side) of the pair of 2 slots 12, 5 leg portions (element conductors) 42 are arranged in the sixth to tenth layers on the outer side in the radial direction of the stator core 11, and in the slot 12 (40 th slot in fig. 9, for example) on the other side (the circumferential positive side), 5 leg portions 42 are arranged in the first to fifth layers on the inner side in the radial direction of the stator core 11.

Thus, the 5 leg portions 42 on one side and the 5 leg portions 42 on the other side of the segment coil group 40' are inserted from one end side (first end side) in the axial direction of the stator core 11 into each pair of slots 12, 12 composed of each slot 12 of the stator core 11 and the slots 12 having a pitch of 5 slots in the circumferential direction of the stator core 11 with respect to the slot 12. Thus, in each slot 12, 10 element conductors (leg portions) 42 are arranged in 10 layers in the radial direction of the stator core 11.

The bent portion 43, which is the tip end portion of each leg portion (element conductor) 42 of each segment coil 41 protruding toward the other end side (second end side) in the axial direction of the stator core 11, is bent in the circumferential direction of the stator core 11 as shown in fig. 9 so as to be connected to the bent portion 43 of the other leg portion 42.

In this case, in the present embodiment, the plurality of element conductors (leg portions) 42 constituting the coils 31X1 to 31X8 of each phase are connected so that the respective coils 31X1 to 31X8 of each phase can alternately generate magnetic poles of N and S poles every 6 slot pitches in the circumferential direction of the stator core 11. Therefore, in the present embodiment, the bending direction of the bending portion 43 of each leg portion 42 of each segment coil 41 connected to the straight portion (portion disposed in the slot 12) in the circumferential direction of the stator core 11 and the bending amount in the circumferential direction (the interval in the circumferential direction between the straight portion of the leg portion 42 and the tip end of the bending portion 43 connected thereto) are set in the same manner as in the first embodiment.

That is, referring to the segment coil groups 40' shown in fig. 9, the bent portions 43 of the legs 42 of the first, third, and fifth layers of the segment coil groups 40' are bent in the circumferential direction of the stator core 11 from the slots 12 in which the straight portions of the legs 42 are arranged toward the same side (the circumferential negative side in fig. 9) as the slots 12 in which the legs 42 of the sixth to tenth layers of the segment coil groups 40' are arranged.

The bent portions 43 of the leg portions 42 of the second and fourth layers of each segment coil group 40' are bent in the circumferential direction of the stator core 11 from the slots 12 in which the leg portions 42 are arranged toward the side (the circumferential positive side in fig. 9) opposite to the bending direction of the bent portions 43 of the leg portions 42 of the first, third, and fifth layers.

The bent portions 43 of the leg portions 42 of the sixth, eighth, and tenth layers of each segment coil group 40' are bent in the circumferential direction of the stator core 11 in the same direction (the circumferential positive side in fig. 9) as the bent portions 43 of the leg portions 42 of the second and fourth layers.

The bent portions 43 of the leg portions 42 of the seventh and ninth layers of each segment coil group 40' are bent in the circumferential direction of the stator core 11 in the same direction (the circumferential negative side in fig. 9) as the bent direction of the bent portions 43 of the leg portions 42 of the first, third and fifth layers.

As described above, the bent portions 43 of the leg portions 42 of the odd-numbered layers (first, third, fifth, seventh, and ninth layers) and the bent portions 43 of the leg portions 42 of the even-numbered layers (second, fourth, sixth, eighth, and tenth layers) of the segment coil assembly 40' are bent in opposite directions in the circumferential direction of the stator core 11. In this case, the bent portions 43 of the leg portions 42 of the fifth layer and the sixth layer are bent in directions approaching each other.

In the present embodiment, the bending amounts of the bending portions 43 of the leg portions 42 of the segment coil groups 40 '(bending amounts in the circumferential direction of the stator core 11) are equal to each other in the first to fourth layers and the seventh to tenth layers, and are equal to each other in the bending amounts of the bending portions 43 of the leg portions 42 of the segment coil groups 40', and are equal to each other in the bending amounts of half of the 6 slot pitch (that is, 3 slot pitch intervals).

In addition, regarding the bending amounts of the bending portions 43 of the leg portions 42 of each of the fifth layer and the sixth layer, the bending amounts of the bending portions 43 of the leg portions 42 of any one of the fifth layer and the sixth layer, for example, the fifth layer are the same as the bending amounts of the bending portions 43 of the leg portions 42 of each of the first layer to the fourth layer and the seventh layer to the tenth layer (the interval of 3 slot pitches).

On the other hand, the bending amount of the bending portion 43 of the leg portion 42 of the other layer (in the present embodiment, the sixth layer) of the fifth and sixth layers is shorter than the bending amount of the bending portion 43 of the leg portion 42 of each other layer, and is the bending amount of the interval of 2 slot pitch. Therefore, the bending amounts of the bending portions 43 of the leg portions 42 of the fifth layer and the sixth layer are set so that the sum of the bending amounts matches the interval (interval in the circumferential direction of the stator core 11) between the 5 leg portions 42 (the leg portions 42 of the first layer to the fifth layer) on one side and the 5 leg portions 42 (the leg portions 42 of the sixth layer to the tenth layer) on the other side of the segment coil group 40', that is, the interval of 5 slot pitches.

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

The connection of the bent portion 43 of each leg portion 42 of each segment coil group 40' and the bent portion 43 of the other leg portion 42 is performed in the same manner as the first embodiment. Specifically, referring to fig. 9, it is understood that the distal ends of the bent portions 43 of the first-layer leg portions 42 and the distal ends of the bent portions 43 of the third-layer leg portions 42 of one of the 2 slots 12, 12 having a pitch of 6 slots are joined to the distal ends of the bent portions 43 of the second-layer leg portions 42 and the distal ends of the bent portions 43 of the fourth-layer leg portions 42 of the other slot 12 by welding or the like in groups of adjacent layers. In this case, the segment coil groups 40' having the leg portions 42 of the first and third layers and the segment coil groups 40' having the leg portions 42 of the second and fourth layers are mutually different segment coil groups 40' arranged at intervals of 6 slot pitches in the circumferential direction of the stator core 11.

The distal ends of the bent portions 43 of the seventh-layer leg portions 42 and the distal ends of the bent portions 43 of the ninth-layer leg portions 42 of one slot 12 of the 2 slots 12 and 12 having a pitch of 6 slots are joined to the distal ends of the bent portions 43 of the eighth-layer leg portions 42 and the distal ends of the bent portions 43 of the tenth-layer leg portions 42 of the other slot 12 by welding or the like in groups of adjacent layers. In this case, the segment coil groups 40' having the legs 42 of the seventh and ninth layers and the segment coil groups 40' having the legs 42 of the eighth and tenth layers are mutually different segment coil groups 40' arranged at intervals of 6 slot pitches in the circumferential direction of the stator core 11.

Further, the distal ends of the bent portions 43 of the 2 leg portions 42 arranged in the fifth layer and the sixth layer of each of the 2 slots 12, 12 having the interval of 5 slot pitch are joined to each other by welding or the like. In this case, the leg 42 of the fifth layer and the leg 42 of the sixth layer are the legs 42 included in the common segment coil group 40'.

As described above, the element conductors (legs) 42 disposed in the slots 12 are connected to each other to form the coils 31X1 to 31X8 of the respective phases. For example, the coils 31U1 and 31U2 in the U-phase series-connected coils 31U1 to 31U4 are configured by connecting 30 element conductors 42 (element conductors 42 numbered 1 to 30 and element conductors 42 numbered 31 to 60) in series in a pattern as shown in fig. 10 and 11. The coils 31U3 and 31U4 are configured by connecting 30 element conductors 42 (element conductors 42 numbered 61 to 90 and element conductors 42 numbered 91 to 120) in series in a pattern as shown in fig. 12 and 13, respectively.

In fig. 10, gray element conductors 42 of the U phase indicate element conductors of the constituent elements of coils 31U1 to 31U4 in the U phase coil 31U, and white element conductors 42 of the U phase indicate element conductors of the constituent elements of coils 31U5 to 31U8 in the U phase coil 31U.

As shown in fig. 11 and 13, the coils 31U1 to 31U4 are each formed such that the wave-shaped winding portion 35 and the overlapping winding portion 36a or 36b of either one of the 1-fold winding overlapping winding portion 36a and the double-fold winding overlapping winding portion 36b are alternately arranged at intervals of 6 slot pitches in the circumferential direction of the stator core 11, and the 1-fold winding overlapping winding portion 36a and the double-fold winding overlapping winding portion 36b are alternately arranged in the circumferential direction of the stator core 11 with 1 wave-shaped winding portion 35 therebetween.

As shown in fig. 11, the coils 31U1 and 31U2 are configured such that the arrangement position of the 1-fold-wound overlap winding portion 36a of the coil 31U1 in the circumferential direction of the stator core 11 and the arrangement position of the double-wound overlap winding portion 36b of the coil 31U2 continuous in series with the coil 31U1 overlap each other at intervals of 6 slot pitches, and the arrangement position of the 2-fold-wound overlap winding portion 36b of the coil 31U1 and the arrangement position of the 1-fold-wound overlap winding portion 36a of the coil 31U2 overlap each other at intervals of 6 slot pitches.

Similarly, as shown in fig. 13, the coils 31U3 and 31U4 are configured such that the arrangement position of the 1-fold-wound overlap winding portion 36a of the coil 31U3 in the circumferential direction of the stator core 11 and the arrangement position of the 2-fold-wound overlap winding portion 36b of the coil 31U4 continuous in series with the coil 31U3 overlap each other at intervals of 6 slot pitches, and the arrangement position of the 2-fold-wound overlap winding portion 36b of the coil 31U3 and the arrangement position of the 1-fold-wound overlap winding portion 36a of the coil 31U4 overlap each other at intervals of 6 slot pitches.

As is clear from comparison between fig. 11 and 13, the coils 31U1 to 31U4 are configured such that the arrangement positions of the wave-shaped winding portions 35 of the coils 31U1 and 31U2 and the arrangement positions of the overlapping winding portions 36a and 36b of the coils 31U3 and 31U4 overlap each other at intervals of 6 slot pitches in the circumferential direction of the stator core 11, and the arrangement positions of the overlapping winding portions 36a and 36b of the coils 31U1 and 31U2 and the arrangement positions of the wave-shaped winding portions 35 of the coils 31U3 and 31U4 overlap each other.

The U-phase coils 31U5 to 31U8 are also configured in the same manner as the coils 31U1 to 31U 4. In this case, the coils 31U5, 31U6 are each formed at a position offset from the coils 31U1, 31U2 by a pitch of 1 slot toward the circumferential positive side of the stator core 11. The coils 31U7 and 31U8 are formed at positions offset from the coils 31U3 and 31U4 by 1 slot pitch toward the negative side in the circumferential direction of the stator core 11.

The other phase (V-phase, W-phase) coils 31V, 31W except the U-phase are also configured in the same manner as the U-phase coil 31U. In this case, the V-phase coil 31V is formed at a position offset from the U-phase coil 31U by a pitch of 4 slots (corresponding to 120 ° in the electrical angle) in the circumferential direction of the stator core 11, and the W-phase coil 31W is formed at a position offset from the V-phase coil 31V by a pitch of 4 slots (corresponding to 120 ° in the electrical angle) in the circumferential direction of the stator core 11.

In this case, referring to fig. 10 and 12, slots 12 in which only element conductors 42 of any 1 of the U phase, V phase, and W phase are arranged and slots 12 in which element conductors of 2 phases of coils are arranged 3 by 3 are alternately arranged in the circumferential direction of stator core 11.

The coils 31X1 and 31X2 of the coils 31X1 to 31X8 of each phase are connected in series via, for example, a bridge conductor not shown. The same applies to the connection of the coils 31X2 and 31X3, the connection of the coils 31X3 and 31X4, the connection of the coils 31X5 and 31X6, the connection of the coils 31X6 and 31X7, and the connection of the coils 31X7 and 31X 8. The neutral point 32 side end portions of the coils 31X4 and 31X8 are connected to, for example, a conductor plate, not shown, that forms the neutral point 32.

According to the present embodiment described above, since the coil 31X of each phase can be configured using the plurality of segmented coils 41 having the same shape (two-strand shape) as in the conventional art, a large number of conventional production facilities can be utilized without requiring a large change in the specifications as in the first embodiment. Therefore, the stator in which the coils 31X of each phase are assembled to the stator core 11 can be manufactured at low cost.

Since the number of element conductors 42 arranged in each slot 12 is 10, the maximum output torque that can be output by the rotating electrical machine can be increased as compared with the case where the number is 8 as in the conventional case.

Third embodiment

Next, a third embodiment of the present invention will be described below with reference to fig. 14, 15A and 15B. In this embodiment, since only the connection structure of the stator coil is different from that of the first embodiment, the description of the same thing as that of the first embodiment is omitted.

In the present embodiment, 4 coils 21X1 to 21X4 constituting the U-phase coil 31U, V phase coil 31V and the W-phase coil 31W are each constituted by connecting the segment coils 41 in series as in the first embodiment. However, in the present embodiment, a part of the connection form of the bent portions 43 of the respective segment coils 41 constituting the coils 21X1 to 21X4 of each phase is different from that of the first embodiment.

This connection mode will be specifically described with reference to fig. 14. In this description, as in the first embodiment, for convenience, an arbitrary 1-segment coil group 40 (a group of 4 segment coils 41 arranged in the radial direction of the stator core 11) is referred to as a focused segment coil group 40, and each leg 42 of the focused segment coil group 40 is referred to as a focused leg 42. For example, in fig. 14, a segment coil group 40 having a connection conductor 44 between the 10 th slot 12 and the 15 th slot 12 is referred to as an eye segment coil group 40.

As is clear from fig. 14, in the present embodiment, the bent portions 43 of the respective eye-leg portions 42 of the first, fourth, and sixth layers of the eye-segment coil groups 40 are bent toward the circumferential negative side of the stator core 11, and the bent portions 43 of the respective eye-leg portions 42 of the second, third, and fifth layers are bent toward the circumferential positive side of the stator core 11 (the bending direction is opposite to the bent portions 43 of the respective eye-leg portions 42 of the first, fourth, and sixth layers).

In this case, the bending amounts of the bending portions 43 of the eye-leg portions 42 of the first to third layers, the fifth layer, and the sixth layer (bending amounts in the circumferential direction of the stator core 11) are each half of the 6 slot pitch (=3 slot pitch), but the bending amount of the bending portions 43 of the eye-leg portions 42 of the fourth layer is a bending amount of 4 slot pitches that is larger than the bending amounts of the bending portions 43 of the other layers.

The distal end portion of the bent portion 43 of the eye leg portion 42 of the first layer is joined to the distal end portion of the bent portion 43 of the leg portion 42 of the second layer disposed in the slot 12 having a pitch of 6 slot pitch on the same side (circumferential negative side) as the bent portion 43 from the slot 12 in which the eye leg portion 42 of the first layer is disposed by welding or the like.

The distal end portion of the bent portion 43 of the second-layer eye leg portion 42 is joined to the distal end portion of the bent portion 43 of the first-layer leg portion 42 disposed in the slot 12 having a pitch of 6 slot pitch on the same side (circumferential positive side) as the bent portion 43 from the slot 12 in which the second-layer eye leg portion 42 is disposed by welding or the like.

The distal end portion of the bent portion 43 of the eye leg portion 42 of the third layer is joined to the distal end portion of the bent portion 43 of the leg portion 42 of the fourth layer disposed in the slot 12 having a 7-slot pitch interval on the same side (circumferential positive side) as the bent portion 43 from the slot 12 in which the eye leg portion 42 of the third layer is disposed by welding or the like.

The distal end portion of the bent portion 43 of the eye leg portion 42 of the fourth layer is joined to the distal end portion of the bent portion 43 of the leg portion 42 of the third layer disposed in the slot 12 having a 7-slot pitch interval on the same side (circumferential negative side) as the bent portion 43 from the slot 12 in which the eye leg portion 42 of the fourth layer is disposed by welding or the like.

The distal end portion of the bent portion 43 of the eye leg portion 42 of the fifth layer is joined to the distal end portion of the bent portion 43 of the leg portion 42 of the sixth layer disposed in the slot 12 having a pitch of 6 slot pitch on the same side (circumferential positive side) as the bent portion 43 from the slot 12 in which the eye leg portion 42 of the fifth layer is disposed by welding or the like.

The distal end portion of the bent portion 43 of the eye leg portion 42 of the sixth layer is joined to the distal end portion of the bent portion 43 of the leg portion 42 of the fifth layer disposed in the slot 12 having a pitch of 6 slot pitch on the same side (circumferential negative side) as the bent portion 43 from the slot 12 in which the eye leg portion 42 of the sixth layer is disposed by welding or the like.

In the present embodiment, as described above, the distal end portion of the bent portion 43 of each leg portion (element conductor) 42 of each segment coil group 40 is joined to the distal end portion of the bent portion 43 of the other leg portion 42 of the layer adjacent thereto.

As described above, the element conductors (legs) 42 disposed in the slots 12 are connected to each other to form the coils 21X1 to 21X4 of the respective phases. For example, the coil 21U1 of the U-phase series-connected coils 21U1, 21U2 is configured as a coil in which the element conductors 42 are connected in series in a pattern as shown in fig. 15A and 15B. In fig. 15A, the gray element conductor 42 of the U phase indicates the element conductor of the constituent element of the coil 21U1 or 21U2 in the coil 21U of the U phase, and the white element conductor 42 of the U phase indicates the element conductor of the constituent element of the coil 31U3 or 21U4 in the coil 21U of the U phase.

As shown in fig. 15B, the coil 21U1 is formed such that a portion 51 (hereinafter, referred to as a first mixed portion 51) in which the 1-fold-wound overlap winding portion and the wave-shaped winding portion are mixed and the 1-fold-wound overlap winding portion 52 are alternately arranged at intervals of 6 slot pitches in the circumferential direction of the stator core 11. The coil 21U2 connected in series with the coil 21U1 is configured in such a manner that, like the coil 21U1, the first mixed-presence portions and the 1-rewound overlapped winding portions are alternately arranged at intervals of 6 slot pitches in the circumferential direction of the stator core 11, the arrangement position of the first mixed-presence portions of the coil 21U2 overlaps the arrangement position of the overlapped winding portions 52 of the coil 21U1, and the arrangement position of the overlapped winding portions of the coil 21U2 overlaps the arrangement position of the first mixed-presence portions 51 of the coil 21U1, which is not shown.

The U-phase coils 21U3 and 21U4 are also configured in the same manner as the coils 21U1 and 21U 2. In this case, the coil 21U3 is formed at a position offset from the coil 21U1 by a pitch of 1 slot toward the circumferential negative side of the stator core 11. In addition, the coil 21U4 is formed at a position offset from the coil 21U2 by a pitch of 1 slot toward the circumferential positive side of the stator core 11.

The other phase (V-phase, W-phase) coils 31V, 31W except the U-phase are also configured in the same manner as the U-phase coil 31U. In this case, the V-phase coil 31V is formed at a position offset from the U-phase coil 31U by a pitch of 4 slots (corresponding to 120 ° in the electrical angle) in the circumferential direction of the stator core 11, and the W-phase coil 31W is formed at a position offset from the V-phase coil 31V by a pitch of 4 slots (corresponding to 120 ° in the electrical angle) in the circumferential direction of the stator core 11.

In this case, slots 12 in which only element conductors 42 of any 1 of the U phase, V phase, and W phase are arranged and slots 12 in which element conductors of 2 phases of coils are arranged 3 by 3 are alternately arranged in the circumferential direction of stator core 11.

The present embodiment is the same as the first embodiment except for the matters described above. The present embodiment can also provide the same effects as those of the first embodiment.

Fourth embodiment

Next, a fourth embodiment of the present invention will be described with reference to fig. 16, 17A and 17B. Note that, since this embodiment is different from the first embodiment only in the connection structure of the stator coil, the description of the same items as those of the first embodiment is omitted.

In the present embodiment, 4 coils 21X1 to 21X4 constituting the U-phase coil 31U, V phase coil 31V and the W-phase coil 31W are each constituted by connecting the segment coils 41 in series as in the first embodiment. However, in the present embodiment, a part of the connection form of the bent portions 43 of the respective segment coils 41 constituting the coils 21X1 to 21X4 of each phase is different from that of the first embodiment.

This connection mode will be specifically described with reference to fig. 16. In this description, as in the first embodiment, for convenience, an arbitrary 1-segment coil group 40 (a group of 4 segment coils 41 arranged in the radial direction of the stator core 11) is referred to as a focused segment coil group 40, and each leg 42 of the focused segment coil group 40 is referred to as a focused leg 42. For example, in fig. 16, a segment coil group 40 having a connection conductor 44 between the 10 th slot 12 and the 15 th slot 12 is referred to as an eye segment coil group 40.

As is clear from fig. 16, in the present embodiment, the bent portions 43 of the respective eye-leg portions 42 of the second, fourth, and fifth layers of the eye-segment coil groups 40 are bent toward the circumferential negative side of the stator core 11, and the bent portions 43 of the respective eye-leg portions 42 of the first, third, and sixth layers are bent toward the circumferential positive side of the stator core 11 (the bending direction is opposite to the bent portions 43 of the respective eye-leg portions 42 of the second, fourth, and fifth layers).

In this case, the bending amounts of the bending portions 43 of the eye-leg portions 42 of the first to third layers, the fifth layer, and the sixth layer (bending amounts in the circumferential direction of the stator core 11) are each half of the 6 slot pitch (=3 slot pitch), but the bending amount of the bending portions 43 of the eye-leg portions 42 of the fourth layer is a bending amount of 4 slot pitches that is larger than the bending amounts of the bending portions 43 of the other layers.

The distal end portion of the bent portion 43 of the first-layer eye leg portion 42 is joined to the distal end portion of the bent portion 43 of the second-layer leg portion 42 disposed in the slot 12 having a pitch of 6 slot pitch on the same side (circumferential positive side) as the bent portion 43 from the slot 12 in which the first-layer eye leg portion 42 is disposed, by welding or the like.

The distal end portion of the bent portion 43 of the second-layer eye leg portion 42 is joined to the distal end portion of the bent portion 43 of the first-layer leg portion 42 disposed in the slot 12 having a pitch of 6 slot pitch on the same side (circumferential negative side) as the bent portion 43 from the slot 12 in which the second-layer eye leg portion 42 is disposed by welding or the like.

The distal end portion of the bent portion 43 of the eye leg portion 42 of the third layer is joined to the distal end portion of the bent portion 43 of the leg portion 42 of the fourth layer disposed in the slot 12 having a 7-slot pitch interval on the same side (circumferential positive side) as the bent portion 43 from the slot 12 in which the eye leg portion 42 of the third layer is disposed by welding or the like.

The distal end portion of the bent portion 43 of the eye leg portion 42 of the fourth layer is joined to the distal end portion of the bent portion 43 of the leg portion 42 of the third layer disposed in the slot 12 having a 7-slot pitch interval on the same side (circumferential negative side) as the bent portion 43 from the slot 12 in which the eye leg portion 42 of the fourth layer is disposed by welding or the like.

The distal end portion of the bent portion 43 of the eye leg portion 42 of the fifth layer is joined to the distal end portion of the bent portion 43 of the leg portion 42 of the sixth layer disposed in the slot 12 having a pitch of 6 slot pitch on the same side (circumferential negative side) as the bent portion 43 from the slot 12 in which the eye leg portion 42 of the fifth layer is disposed by welding or the like.

The distal end portion of the bent portion 43 of the eye leg portion 42 of the sixth layer is joined to the distal end portion of the bent portion 43 of the leg portion 42 of the fifth layer disposed in the slot 12 having a pitch of 6 slot pitch on the same side (circumferential positive side) as the bent portion 43 from the slot 12 in which the eye leg portion 42 of the sixth layer is disposed by welding or the like.

In the present embodiment, as described above, the distal end portion of the bent portion 43 of each leg portion (element conductor) 42 of each segment coil group 40 is joined to the distal end portion of the bent portion 43 of the other leg portion 42 of the layer adjacent thereto.

As described above, the element conductors (legs) 42 disposed in the slots 12 are connected to each other to form the coils 21X1 to 21X4 of the respective phases. For example, the coil 21U1 of the U-phase series-connected coils 21U1, 21U2 is configured as a coil obtained by connecting element conductors 42 in series in a pattern as shown in fig. 17A and 17B. In fig. 17A, the gray element conductor 42 of the U phase indicates the element conductor of the constituent element of the coil 21U1 or 21U2 in the coil 21U of the U phase, and the white element conductor 42 of the U phase indicates the element conductor of the constituent element of the coil 31U3 or 21U4 in the coil 21U of the U phase.

As shown in fig. 17B, the coil 21U1 is formed such that a portion 54 (hereinafter, referred to as a second mixed portion 54) where the overlapped winding portion of 1-fold winding and the wave-shaped winding portion protruding toward the first end side in the axial direction of the stator core 11 are mixed, and a portion 55 (hereinafter, referred to as a third mixed portion 55) where the overlapped winding portion of 1-fold winding and the wave-shaped winding portion protruding toward the second end side in the axial direction of the stator core 11 are mixed are alternately arranged at intervals of 6 slot pitches in the circumferential direction of the stator core 11. The coil 21U2 connected in series with the coil 21U1 is configured in such a manner that the second mixed existence portions and the third mixed existence portions are alternately arranged at intervals of 6 slot pitches in the circumferential direction of the stator core 11, the arrangement position of the second mixed existence portions of the coil 21U2 overlaps the arrangement position of the third mixed existence portions 55 of the coil 21U1, and the arrangement position of the third mixed existence portions of the coil 21U2 overlaps the arrangement position of the second mixed existence portions of the coil 21U1, similarly to the coil 21U1, and this is not shown.

The U-phase coils 21U3 and 21U4 are also configured in the same manner as the coils 21U1 and 21U 2. In this case, the coil 21U3 is formed at a position offset from the coil 21U1 by a pitch of 1 slot toward the circumferential negative side of the stator core 11. In addition, the coil 21U4 is formed at a position offset from the coil 21U2 by a pitch of 1 slot toward the circumferential positive side of the stator core 11.

The other phase (V-phase, W-phase) coils 31V, 31W except the U-phase are also configured in the same manner as the U-phase coil 31U. In this case, the V-phase coil 31V is formed at a position offset from the U-phase coil 31U by a pitch of 4 slots (corresponding to 120 ° in the electrical angle) in the circumferential direction of the stator core 11, and the W-phase coil 31W is formed at a position offset from the V-phase coil 31V by a pitch of 4 slots (corresponding to 120 ° in the electrical angle) in the circumferential direction of the stator core 11.

In this case, slots 12 in which only element conductors 42 of any 1 of the U phase, V phase, and W phase are arranged and slots 12 in which element conductors of 2 phases of coils are arranged 3 by 3 are alternately arranged in the circumferential direction of stator core 11.

The present embodiment is the same as the first embodiment except for the top described above. The present embodiment can also provide the same effects as those of the first embodiment.

Fifth embodiment

Next, a fifth embodiment of the present invention will be described with reference to fig. 18, 19A and 19B. Note that, since this embodiment is different from the first embodiment only in the connection structure of the stator coil, the description of the same items as those of the first embodiment is omitted.

In the present embodiment, 4 coils 21X1 to 21X4 constituting the U-phase coil 31U, V phase coil 31V and the W-phase coil 31W are each constituted by connecting the segment coils 41 in series as in the first embodiment. However, in the present embodiment, a part of the connection form of the bent portions 43 of the respective segment coils 41 constituting the coils 21X1 to 21X4 of each phase is different from that of the first embodiment.

The connection mode will be specifically described with reference to fig. 18. In this description, as in the first embodiment, for convenience, an arbitrary 1-segment coil group 40 (a group of 4 segment coils 41 arranged in the radial direction of the stator core 11) is referred to as a focused segment coil group 40, and each leg 42 of the focused segment coil group 40 is referred to as a focused leg 42. For example, in fig. 18, the segment coil group 40 having the connection portion conductor 44 between the 10 th slot 12 and the 15 th slot 12 is referred to as an eye segment coil group 40.

As is clear from fig. 18, in the present embodiment, the bent portions 43 of the respective second, third and sixth layers of the eye-segment coil groups 40 are bent toward the circumferential negative side of the stator core 11, and the bent portions 43 of the respective first, fourth and fifth layers of the eye-segment coil groups 42 are bent toward the circumferential positive side of the stator core 11 (the bending direction is opposite to the bent portions 43 of the respective second, third and sixth layers of the eye-segment coil groups 42).

In this case, the bending amounts of the bending portions 43 of the eye-leg portions 42 of the first to third layers, the fifth layer, and the sixth layer (bending amounts in the circumferential direction of the stator core 11) are each half of the 6 slot pitch (=3 slot pitch), but the bending amounts of the bending portions 43 of the eye-leg portions 42 of the fourth layer are each a bending amount of 2 slot pitches smaller than the bending amounts of the bending portions 43 of the other layers.

The distal end portion of the bent portion 43 of the first-layer eye leg portion 42 is joined to the distal end portion of the bent portion 43 of the second-layer leg portion 42 disposed in the slot 12 having a pitch of 6 slot pitch on the same side (circumferential positive side) as the bent portion 43 from the slot 12 in which the first-layer eye leg portion 42 is disposed, by welding or the like.

The distal end portion of the bent portion 43 of the second-layer eye leg portion 42 is joined to the distal end portion of the bent portion 43 of the first-layer leg portion 42 disposed in the slot 12 having a pitch of 6 slot pitch on the same side (circumferential negative side) as the bent portion 43 from the slot 12 in which the second-layer eye leg portion 42 is disposed by welding or the like.

The distal end portion of the bent portion 43 of the eye leg portion 42 of the third layer is joined to the distal end portion of the bent portion 43 of the leg portion 42 of the fourth layer disposed in the slot 12 having a pitch of 5 slot pitches on the same side (circumferential negative side) as the bent portion 43 from the slot 12 in which the eye leg portion 42 of the third layer is disposed by welding or the like. In other words, the distal end portion of the bent portion 43 of the eye leg portion 42 of the third layer of the eye-segment coil group 40 and the distal end portion of the bent portion 43 of the eye leg portion 42 of the fourth layer are joined.

The distal end portion of the bent portion 43 of the eye leg portion 42 of the fifth layer is joined to the distal end portion of the bent portion 43 of the leg portion 42 of the sixth layer disposed in the slot 12 having a pitch of 6 slot pitch on the same side (circumferential positive side) as the bent portion 43 from the slot 12 in which the eye leg portion 42 of the fifth layer is disposed by welding or the like.

The distal end portion of the bent portion 43 of the eye leg portion 42 of the sixth layer is joined to the distal end portion of the bent portion 43 of the leg portion 42 of the fifth layer disposed in the slot 12 having a pitch of 6 slot pitch on the same side (circumferential negative side) as the bent portion 43 from the slot 12 in which the eye leg portion 42 of the sixth layer is disposed by welding or the like.

In the present embodiment, as described above, the distal end portion of the bent portion 43 of each leg portion (element conductor) 42 of each segment coil group 40 is joined to the distal end portion of the bent portion 43 of the other leg portion 42 of the layer adjacent thereto.

As described above, the element conductors (legs) 42 disposed in the slots 12 are connected to each other to form the coils 21X1 to 21X4 of the respective phases. For example, the coil 21U1 of the U-phase series-connected coils 21U1, 21U2 is configured as a coil in which the element conductors 42 are connected in series in a pattern as shown in fig. 19A and 19B. In fig. 19A, the gray element conductor 42 of the U phase indicates the element conductor of the constituent element of the coil 21U1 or 21U2 in the coil 21U of the U phase, and the white element conductor 42 of the U phase indicates the element conductor of the constituent element of the coil 31U3 or 21U4 in the coil 21U of the U phase.

As shown in fig. 19B, the coil 21U1 is formed such that a portion 57 (hereinafter, referred to as a fourth mixed portion 57) in which the 1-fold-wound overlapped winding portion and the wave-shaped winding portion are mixed and the 1-fold-wound overlapped winding portion 58 are alternately arranged at intervals of 6 slot pitches in the circumferential direction of the stator core 11. The coil 21U2 connected in series with the coil 21U1 is configured in such a manner that the fourth mixed existence portion and the overlapping portion of 1 re-winding are alternately arranged at intervals of 6 slot pitches in the circumferential direction of the stator core 11, the arrangement position of the fourth mixed existence portion of the coil 21U2 overlaps the arrangement position of the overlapping portion 58 of the coil 21U1, and the arrangement position of the overlapping portion of the coil 21U2 overlaps the arrangement position of the fourth mixed existence portion 57 of the coil 21U1, similarly to the coil 21U1, which is not shown.

The U-phase coils 21U3 and 21U4 are also configured in the same manner as the coils 21U1 and 21U 2. In this case, the coil 21U3 is formed at a position offset from the coil 21U1 by a pitch of 1 slot toward the circumferential negative side of the stator core 11. In addition, the coil 21U4 is formed at a position offset from the coil 21U2 by a pitch of 1 slot toward the circumferential positive side of the stator core 11.

The other phase (V-phase, W-phase) coils 31V, 31W except the U-phase are also configured in the same manner as the U-phase coil 31U. In this case, the V-phase coil 31V is formed at a position offset from the U-phase coil 31U by a pitch of 4 slots (corresponding to 120 ° in the electrical angle) in the circumferential direction of the stator core 11, and the W-phase coil 31W is formed at a position offset from the V-phase coil 31V by a pitch of 4 slots (corresponding to 120 ° in the electrical angle) in the circumferential direction of the stator core 11.

In this case, slots 12 in which only element conductors 42 of any 1 of the U phase, V phase, and W phase are arranged and slots 12 in which element conductors of 2 phases of coils are arranged 3 by 3 are alternately arranged in the circumferential direction of stator core 11.

The present embodiment is the same as the first embodiment except for the matters described above. The present embodiment can also provide the same effects as those of the first embodiment.

In the first, third, fourth, and fifth embodiments in which 6 element conductors 42 are arranged in each slot 12, the bending amount of the bending portion 43 of the element conductor 42 of the fourth layer (bending amount of 2 slot pitch) is smaller than the bending amount of the bending portion 43 of the element conductor 42 of the other layer (bending amount of 3 slot pitch) in the first and fifth embodiments. On the other hand, in the third and fourth embodiments, the bending amount of the bending portion 43 of the element conductor 42 of the fourth layer (bending amount of 4 slot pitch) is longer than the bending amount of the bending portion 43 of the element conductor 42 of the other layer (bending amount of 3 slot pitch).

Therefore, when the interval from the second end of the stator core 11 to the tip end portion of each bent portion 43 (interval in the axial direction of the stator core 11) is set to be constant, the bending angle of the bent portion between the linear portion of the element conductor 42 of the fourth layer and the bent portion 43 (bending angle with respect to the axial direction of the stator core 11 (direction of the linear portion of the element conductor 42)) can be smaller in the first and fifth embodiments than in the third and fourth embodiments. Therefore, in the first and fifth embodiments, compared with the third and fourth embodiments, stress generated in the bent portion between the straight portion and the bent portion 43 of the element conductor 42 of the fourth layer can be reduced.

In the above-described embodiments, the case where the number of pole pairs generated by the stator coil 21 is 6 was described as an example, but the number of pole pairs may be other than 6. With this, the total number of slots 12 and the intervals between the linear portions of the 2 element conductors (leg portions) 42, 42 of each segment coil 41 in the circumferential direction of the stator core 11 can be changed to intervals different from 5 slot pitches.

In the first and fifth embodiments, the bending amount of the bending portion 43 of the element conductor 42 of the fourth layer of the segment coil assembly 40 is made shorter than the bending amount of the bending portion 43 of the element conductor 42 of the other layer, but the bending amount of the bending portion 43 of the element conductor 42 of the third layer may be made shorter than the bending amount of the bending portion 43 of the element conductor 42 of the other layer instead of the element conductor 42 of the fourth layer.

In the third and fourth embodiments, the bending amount of the bending portion 43 of the element conductor 42 of the fourth layer of the segment coil assembly 40 is made longer than the bending amount of the bending portion 43 of the element conductor 42 of the other layer, but the bending amount of the bending portion 43 of the element conductor 42 of the third layer may be made longer than the bending amount of the bending portion 43 of the element conductor 42 of the other layer instead of the element conductor 42 of the fourth layer.

In the second embodiment, the bending amount of the bending portion 43 of the element conductor 42 of the sixth layer of the segment coil assembly 40' is made shorter than the bending amount of the bending portion 43 of the element conductor 42 of the other layer, but the bending amount of the bending portion 43 of the element conductor 42 of the fifth layer may be made shorter than the bending amount of the bending portion 43 of the element conductor 42 of the other layer instead of the element conductor 42 of the sixth layer.

In the second embodiment, the bending amount of the bending portion 43 of the element conductor 42 of the sixth layer of the segment coil assembly 40' is made shorter than the bending amount of the bending portion 43 of the element conductor 42 of the other layer, but for example, a configuration may be adopted in which the bending amount of the bending portion 43 of the element conductor 42 of the fifth layer or the sixth layer is made longer than the bending amount of the bending portion 43 of the element conductor 42 of the other layer.

The coils of the respective phases may be configured to have a mirror image relationship (mirror image relationship in the circumferential direction of the stator core 11) with the coils of the first to fifth embodiments (the coils of the respective phases may be configured in a manner such that the positive and negative sides in the circumferential direction of the stator core 11 are inverted with the coils of the respective first to fifth embodiments).

The number of element conductors 42 disposed in each slot 12 is not limited to 6 or 10, and may be, for example, 14 or more (however, the number obtained by dividing 2 may be an odd number).

Claims (4)

1. A rotating electrical machine is provided with:

A stator core formed such that a plurality of slots are arranged in a circumferential direction; and

A multiphase coil mounted to the stator core,

The rotating electric machine includes a plurality of segment coils as constituent elements of coils of respective phases, each of the plurality of segment coils having 2 element conductors and a connecting portion conductor, the 2 element conductors being disposed in 2 slots having a predetermined interval in a circumferential direction of the stator core, one of the 2 slots being disposed at a position closer to an inner circumference in a radial direction of the stator core, and the other slot being disposed at a position closer to an outer circumference in the radial direction; the connecting portion conductor connects the 2 element conductors at a first end side of both ends of the stator core in an axial direction, the coil of each phase is a coil having a structure in which tip ends of the element conductors of the plurality of segment coils are joined to each other in a state in which the tip ends of the element conductors of the plurality of segment coils are bent in the circumferential direction at a second end side of both ends of the stator core in an axial direction,

In each slot of the stator core, a predetermined number of element conductors are arranged in the radial direction, and the predetermined number of element conductors are arranged so that slots in which only element conductors of coils of the same phase among the plurality of phases are arranged and slots in which element conductors of coils of two or more phases are arranged are alternately arranged in the circumferential direction,

It is characterized in that the method comprises the steps of,

The predetermined number, which is the number of element conductors arranged in each slot, is set to an even number obtained by dividing the predetermined number by 2,

The bending amount of the tip end portion of 1 element conductor in the circumferential direction of the predetermined number of element conductors in each slot is set to a value different from the bending amount of the tip end portion of the other element conductors in the circumferential direction,

The bending amount is the circumferential interval between the portion of the element conductor disposed in the slot and the tip of the tip portion of the element conductor.

2. The rotating electrical machine according to claim 1, wherein,

When the predetermined number is defined as X, 1 element conductor out of the predetermined number is an element conductor that is (X/2+1) th in the radial direction from any one element conductor out of the element conductors out of the predetermined number that is located at the outermost periphery and the element conductor that is located at the innermost periphery.

3. The rotating electrical machine according to claim 1 or 2, wherein,

The bending amount of the tip end portion of 1 element conductor in the predetermined number of element conductors in the circumferential direction is set to a value shorter than the bending amount of the tip end portion of the other element conductors in the predetermined number of element conductors in the circumferential direction.

4. The rotating electrical machine according to claim 1 or 2, wherein,

The coils of the respective phases are constituted by a first coil and a second coil connected in parallel, and element conductors of the first coil and element conductors of the second coil are arranged in the slots adjacent in the circumferential direction.