JP6759982B2 - Stator - Google Patents

Description

The present invention relates to a stator using a cassette coil.

Conventionally, as a technology in such a field, there is International Publication No. 2010/007950. In the stator described in this publication, coils are arranged in a distributed winding manner with respect to a plurality of slots of the stator core.

Conventionally, in the structure of a distributed winding stator, if the coil has a round cross section, the coil and wedge are inserted into the motor core at the same time using an insertion jig. The segment coil method is adopted.

International Publication No. 2010/007950

However, in the inserter method, the manufacturing process becomes complicated, and each equipment for winding, inserting, and molding is required. Here, since the equipment required when using the inserter method is large, the cost increases. Furthermore, since it is difficult to position a thin round wire, it is necessary to intervene an operator and complicate the equipment, which increases the cost.

Further, in the segment coil method, since the number of coils is large, the number of coil processing points is large. Further, there is a problem that the cost increases because the number of processes and the number of processing points for transporting, positioning, and inserting the coil are large and the number of processing points at the joint is also large.
The present invention provides a stator structure that ensures desired performance at low cost.

The stator according to the present invention has a plurality of bent portions formed at the coil end in a direction in which the winding end portion connecting the layers of the cassette coil is not arranged, and the bent portion is arranged on the upper side in the stator axial direction. The first cassette coil group including a first cassette coil group composed of cassette coils and a second cassette coil group composed of a plurality of cassette coils whose bent portions are arranged on the lower side in the stator axial direction. The cassette coils forming the cassette coil group and the cassette coils forming the second cassette coil group are alternately arranged so as to enter the turns of the cassette coils of each other.
As a result, the coil itself can be centrally wound and the structure can be distributed winding.

As a result, it is possible to provide a stator that ensures desired performance at low cost.

It is a figure which shows the outline of the stator which concerns on Embodiment 1. FIG. It is a figure of the cassette coil which concerns on Embodiment 1. FIG. It is a figure which showed the state which arranged the 1st cassette coil group on the stator core which concerns on Embodiment 1. FIG. It is a figure which showed the state which arranged the 1st cassette coil group and the 2nd cassette coil group on the stator core which concerns on Embodiment 1. FIG. It is the top view and the sectional view in the circumferential direction of the stator core which concerns on Embodiment 1. FIG. FIG. 5 is an axial sectional view of the stator core according to the first embodiment. It is a figure which showed the state which changed the wiring which concerns on Embodiment 1 and changed the stator structure. It is a figure which shows the 3rd cassette coil which concerns on Embodiment 2. It is the top view and the sectional view in the circumferential direction of the stator core which concerns on Embodiment 2. FIG. It is sectional drawing in the axial direction of the stator core which concerns on Embodiment 2. FIG. It is a figure which shows the 3rd cassette coil which concerns on Embodiment 3. It is the top view and the sectional view in the circumferential direction of the stator core which concerns on Embodiment 3. FIG. FIG. 5 is an axial sectional view of the stator core according to the third embodiment.

Embodiment 1
Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the stator 1 includes a plurality of teeth 21, a stator core 11 having a plurality of slots 22 formed between the plurality of teeth 21 and around which a coil is wound, and a cassette coil assembled and connected to the stator core 11. 12 and. For example, the stator 1 is used to form a three-phase motor having U-phase, V-phase and W-phase.

As shown in FIGS. 2 (a) and 2 (b), the cassette coil 12 is a cassette coil in which a rectangular coil is wound in a single phase or in multiple layers. As the cassette coil 12, two types, a first cassette coil 31 and a second cassette coil 32, are used. For example, the cassette coil 12 is formed in a coil shape by winding a flat wire into a coil and stacking it, and a part of the coil is bent in the stacking direction. This bending will be described in detail later. When the cassette coil 12 is assembled to the stator core 11, the cassette coil 12 is arranged so that the radial direction of the stator core 11 substantially coincides with the stacking direction of the cassette coil 12.

The first cassette coil 31 has a substantially rectangular shape when viewed from the front. When the axis of the annular stator core 11 is arranged so as to extend in the vertical direction in the first cassette coil 31, the winding end portion 31a for connecting the layers is arranged below.

Further, in the first cassette coil 31, the first and second straight portions 31b and 31c form the long side of the rectangular cross section, and the third and fourth straight portions 31d and 31e form the coil end of the short side. are doing. As shown in FIG. 3, when the first cassette coil 31 is assembled to the stator core 11, the third straight line portion 31d is arranged above and the fourth straight line portion 31e is arranged below. Further, when viewed from the center of the stator core 11, the first straight line portion 31b is arranged as the long side on the left side, and the second straight line portion 31c is arranged as the long side on the right side.

Further, since the first and second straight portions 31b and 31c are bent in the product thickness direction, the third straight portion 31d and a part of the first and second straight portions 31b and 31c in the vicinity thereof are formed. , The bent portion 31f is formed. In other words, in the first cassette coil 31, the bent portion 31f is formed at the coil end in the direction in which the winding end portion 31a is not formed. The bending directions of the first and second straight portions 31b and 31c are the same. As shown in FIG. 3, when the first cassette coil 31 is assembled to the stator core 11, the bent portion 31f including the third straight portion 31d is arranged on the upper side in the axial direction of the stator core 11. At this time, the bent portion 31f is arranged so as to be bent in the outer peripheral direction of the stator core 11.

The plurality of first cassette coils 31 are continuously arranged along the annular shape of the stator core 11 to form the first cassette coil group 41. Specifically, the state in which the second straight line portion 31c of the other first cassette coil 31 is arranged adjacent to the first straight line portion 31b of one first cassette coil 31 is continuous. , A plurality of first cassette coils 31 are continuously arranged.

As shown in FIG. 2B, the second cassette coil 32 has a substantially rectangular shape when viewed from the front. When the axis of the annular stator core 11 is arranged so as to extend in the vertical direction in the second cassette coil 32, the winding end portion 32a for connecting the layers is arranged upward.

Further, in the second cassette coil 32, the first and second straight portions 32b and 32c form the long side of the rectangular cross section, and the third and fourth straight portions 32d and 32e form the coil end of the short side. are doing. When the second cassette coil 32 is assembled to the stator core 11, the third straight line portion 32d will be arranged above and the fourth straight line portion 32e will be arranged below. Further, when viewed from the center of the stator core 11, the first straight line portion 32b is arranged as the long side on the left side, and the second straight line portion 32c is arranged as the long side on the right side.

Since the first and second straight portions 32b and 32c are bent in the product thickness direction, they are bent into a part of the first and second straight portions 32b and 32c in the fourth straight portion 32e and its vicinity. The portion 32f is formed. In other words, in the second cassette coil 32, the bent portion 32f is formed at the coil end in the direction in which the winding end portion 32a is not formed. The bending directions of the first and second straight portions 32b and 32c are the same. As a result, as shown in FIG. 4, when the second cassette coil 32 is assembled to the stator core 11, the bent portion 32f including the fourth straight portion 32e is arranged on the lower side in the axial direction of the stator core 11. At this time, the bent portion 32f is arranged so as to bend in the inner peripheral direction of the stator core 11.

The plurality of second cassette coils 32 are continuously arranged along the ring of the stator core 11 to form the second cassette coil group 42. In other words, a plurality of states in which the second straight line portion 31c of another second cassette coil 32 is arranged adjacent to the first straight line portion 32b of one second cassette coil 32 are continuously arranged. The second cassette coil of the above is arranged continuously. The first cassette coil group 41 is arranged on the outer peripheral side of the second cassette coil group 42.

For example, as shown in FIGS. 5A and 6, the first straight line portion 31b, which is the long side of the first cassette coil 31A, is in the turn of the second cassette coil 32A, that is, the second cassette coil. It is arranged so as to enter between the first straight line portion 31b and the second straight line portion 31c of 32A. Similarly, the second straight line portion 31b of the first cassette coil 31A is arranged in the turn of another second cassette coil 32B arranged adjacent to the second cassette coil 32A, that is, adjacent to the second cassette coil 32A. It is arranged so as to be inserted between the first straight line portion 31b and the second straight line portion 31c of another second cassette coil 32B.

Similarly, the first straight portion 32b of the second cassette coil 32B is arranged so as to enter into the turn of the first cassette coil 31A, and the second straight portion 32c of the second cassette coil 32B is It is arranged so as to enter into the turn of the first cassette coil 31B arranged adjacent to the first cassette coil 31A.

At this time, as shown in FIG. 5B, since the first cassette coil 31 is provided with the bent portion 31f, the third straight portion 31d of the first cassette coil 31 and the second cassette The third straight portion 32d of the coil 32 is arranged without interference.

Here, as shown in FIG. 6, for example, the first straight line portion 31b of the first cassette coil 31B and the second straight line portion 31c of the first cassette coil 31A are arranged adjacent to each other, and the teeth are arranged between them. 21 may or may not be arranged. Similarly, the first straight line portion 31b of the second cassette coil 32B and the first straight line portion 31b of the second cassette coil 32A are arranged adjacent to each other, and the teeth 21 may be arranged between them. , You do not have to place it. The same applies to other parts.

For example, the teeth 21 are arranged between the first straight line portion 31b of the first cassette coil 31A and the second straight line portion 32c of the second cassette coil 32A. Similarly, the teeth 21 are arranged between the second straight line portion 31c of the first cassette coil 31A and the first straight line portion 32b of the second cassette coil 32B. The same applies to other parts.

In other words, in the first cassette coil 31 and the second cassette coil 32, the teeth 21 are arranged between the positions where the linear portions 31b, 31c, 32b, 32c of the different cassette coils are adjacent to each other.

In the above, as shown in FIG. 7A, the stator 1 has been described as being used for the three-phase AC motor, but as shown in FIG. 7B, the connection points between the cassette coils are changed. Thereby, it can be changed to the stator structure of the winding field type motor and the like, and it can be used as any stator.

As a result, the coil itself can be centrally wound to form a stator core having a distributed winding structure.

Embodiment 2
Next, the stator 2 in which the first cassette coil 31 and the third cassette coil 33 are assembled with respect to the stator core 11 will be described. The same components as those of the stator 1 shown in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 8, the third cassette coil 33 is a cassette coil in which a rectangular coil is wound in a single phase or in multiple layers. The third cassette coil 33 has a substantially rectangular shape when viewed from the front. In the third cassette coil 33, when the shaft of the annular stator core 11 is arranged so as to extend in the vertical direction, the winding end portion 33a for connecting the layers is arranged upward.

In the third cassette coil 33, the first and second straight portions 33b and 33c form the long side of the rectangular cross section, and the third and fourth straight portions 33d and 33e form the coil end of the short side. There is. In the case where the third cassette coil 33 is assembled to the stator core 11, the third straight line portion 33d will be arranged above and the fourth straight line portion 33e will be arranged below. Further, when viewed from the center of the stator core 11, the first straight line portion 33b is arranged as the long side on the left side, and the second straight line portion 33c is arranged as the long side on the right side.

Here, since the first and second straight portions 33b and 33c are bent in the product thickness direction, a part of the fourth straight portions 33e and the first and second straight portions 33b and 33c in the vicinity thereof. The bent portion 33f is formed therein. In other words, in the third cassette coil 33, the bent portion 33f is formed at the coil end in the direction in which the winding end portion 33a is not formed. The bending directions of the first and second straight portions 33b and 33c are the same. As a result, when the third cassette coil 33 is assembled to the stator core 11, the bent portion 33f including the fourth straight portion 33e is arranged on the lower side in the axial direction of the stator core 11. At this time, the bent portion 33f is arranged so as to bend in the outer peripheral direction of the stator core 11.

As shown in FIG. 9A, the plurality of first cassette coils 31 are continuously arranged along the annulus of the stator core 11 to form the first cassette coil group 51. Further, the plurality of third cassette coils 33 are continuously arranged along the ring of the stator core 11 to form the second cassette coil group 52. The first cassette coil group 51 is arranged on the outer peripheral side of the second cassette coil group 52.

For example, as shown in FIG. 10, the first straight line portion 33b of the third cassette coil 33B is arranged so as to enter into the turn of the first cassette coil 31A, and the second straight line portion of the third cassette coil 33B. The portion 33c is arranged so as to enter into the turn of another first cassette coil 31B adjacent to the first cassette coil 31A.

Similarly, the first straight portion 31b of the first cassette coil 31B is arranged so as to enter into the turn of the third cassette coil 33A, and the second straight portion 31c of the first cassette coil 31B is arranged. It is arranged so as to enter into the turn of another third cassette coil 33B adjacent to the third cassette coil 33A. The same applies to other parts.

At this time, as shown in FIG. 9B, since the bent portion 31f is formed in the first cassette coil 31, the third straight portion 31d of the first cassette coil 31 is formed on the upper side of the stator core 11. And the third straight line portion 33d of the third cassette coil 33 do not interfere with each other. Similarly, since the bent portion 33f is formed in the third cassette coil 33, the fourth straight portion 31e of the first cassette coil 31 and the third cassette coil 33 are formed on the lower side of the stator core 11. The fourth straight line portion 33e can be arranged so as not to interfere with each other.

In this way, the bent portions 31f and 33f of the first cassette coil 31 used in the first cassette coil group 51 and the third cassette coil 33 used in the second cassette coil group 52 are in the outer peripheral direction, respectively. It can be assembled to the stator core 11 in a state of being arranged so as to be in a bent state. Therefore, the coil itself can be centrally wound to form a stator having a distributed winding structure.

Embodiment 3
Next, the stator 3 in which the first cassette coil 31, the second cassette coil 32, and the fourth cassette coil 34 are assembled with respect to the stator core 11 will be described. The same components as those of the stator 1 shown in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 11, the fourth cassette coil 34 is a cassette coil in which a rectangular coil is wound in a single phase or in multiple layers. The fourth cassette coil 34 has a substantially rectangular shape when viewed from the front. In the fourth cassette coil 34, when the shaft of the annular stator core 11 is arranged so as to extend in the vertical direction, the winding end portion 34a for connecting the layers is arranged upward.

In the fourth cassette coil 34, the first and second straight portions 34b and 34c form the long side of the rectangular cross section, and the third and fourth straight portions 34d and 34e form the coil end of the short side. There is. When the fourth cassette coil 34 is assembled to the stator core 11, the third straight line portion 34d will be arranged above and the fourth straight line portion 34e will be arranged below. Further, when viewed from the center of the stator core 11, the first straight line portion 34b is arranged as the long side on the left side, and the second straight line portion 34c is arranged as the long side on the right side.

The first and second straight lines 34b and 34c of the fourth cassette coil 34 are formed longer than the first and second straight lines 32b and 32c of the second cassette coil 32, respectively.

Further, since the first and second straight portions 34b and 34c are bent in the product thickness direction, the fourth straight portion 34e and a part of the first and second straight portions 34b and 34c in the vicinity thereof are formed. , The bent portion 34f is formed. In other words, in the fourth cassette coil 34, the bent portion 34f is formed at the coil end in the direction in which the winding end portion 34a is not formed. The bending directions of the first and second straight portions 34b and 34c are the same. As a result, when the fourth cassette coil 34 is assembled to the stator core 11, the bent portion 34f including the fourth straight portion 34e is arranged on the lower side in the axial direction of the stator core 11. At this time, the bent portion 34f is arranged so as to bend in the inner peripheral direction of the stator core 11.

As shown in FIG. 12A, the plurality of first cassette coils 31 are continuously arranged along the ring of the stator core 11 to form the first cassette coil group 61. Further, the plurality of second cassette coils 32 and the plurality of fourth cassette coils 34 are alternately arranged along the annulus of the stator core 11 to form the second cassette coil group 62. The first cassette coil group 61 is arranged on the outer peripheral side of the second cassette coil group 62.

For example, as shown in FIG. 13, the first straight line portion 31b of the first cassette coil 31A is arranged so as to enter into the turn of the second cassette coil 32A, and the second of the first cassette coil 31A. The straight portion 31c is arranged so as to enter the turn of the fourth cassette coil 34A. Further, the first straight portion 31b of the first cassette coil 31B is arranged so as to enter into the turn of the fourth cassette coil 34A, and the second straight portion 31c of the first cassette coil 31B is a second. It is arranged so as to enter the turn of the cassette coil 32A.

Similarly, in the turn of the first cassette coil 31A, the second straight line portion 32c of the second cassette coil 32A and the first straight line portion 34b of the fourth cassette coil 34A are arranged so as to enter. ing. Within the turn of the first cassette coil 31B, the second straight line portion 32c of the fourth cassette coil 34A and the first straight line portion 34b of the second cassette coil 32B are arranged so as to enter. The same applies to other parts.

Here, the second cassette coil 32 and the fourth cassette coil 34 forming the second cassette coil group 62 have bent portions 32f and 34f that bend in the inner peripheral direction of the stator core 11, respectively. .. Since the first and second straight portions 34b and 34c of the fourth cassette coil 34 are formed longer than the first and second straight portions 32b and 32c of the second cassette coil 32, the stator core 11 The bent portions 32f and 34f that are bent in the inner peripheral direction of the above are arranged in a vertically displaced state so as not to interfere with each other.

As shown in FIG. 12B, since the bent portion 31f is formed in the first cassette coil 31, the bent portion 31f is formed on the upper side of the stator core 11 with respect to the third straight portion 31d of the first cassette coil 31. , The third straight line portion 32d of the second cassette coil 32 and the third straight line portion 34d of the fourth cassette coil do not interfere with each other. Similarly, since the bent portion 32f is formed in the second cassette coil 32 and the bent portion 34f is formed in the fourth cassette coil 34, the first cassette coil 31 is formed on the lower side of the stator core 11. The fourth straight line portion 32e of the second cassette coil 32 and the fourth straight line portion 34e of the fourth cassette coil 34 can be arranged in a state where they do not interfere with the fourth straight line portion 31e.

Therefore, the first cassette coil group in which the coil end arranged above the stator core 11 is bent and the second cassette coil group in which the coil end arranged below the stator core 11 is bent are provided in the stator core 11. When assembling, it can be arranged in a state where interference of each coil wire is avoided.

As a result, the coil itself can be centrally wound to form a stator core having a distributed winding structure. Since the cassette coil is used, the manufacturing process can be simplified and the cost can be reduced as compared with the conventional distributed winding structure such as the inserter method and the segment coil method. Therefore, it is possible to provide a stator that ensures desired performance at low cost.

The present invention is not limited to the above embodiment, and can be appropriately modified without departing from the spirit.

1 Stator 2 Stator 3 Stator 11 Stator core 12 Cassette coil 21 Teeth 22 Slot 31 First cassette coil 31a Winding end 31b First straight line 31c Second straight section 31d Third straight section 31e Fourth straight section 31f Bending portion 32 Second cassette coil 32a Winding end portion 32b First straight portion 32c Second straight portion 32d Third straight portion 32e Fourth straight portion 32f Bending portion 33 Third cassette coil 33a Winding End 33b First straight line 33c Second straight line 33d Third straight line 33e Fourth straight line 33f Bending 34 Fourth cassette coil 34a Winding end 34b First straight line 34c Second Straight line portion 34d Third straight line portion 34e Fourth straight line portion 34f Bending portion 41 First cassette coil group 42 Second cassette coil group 51 First cassette coil group 52 Second cassette coil group 61 First cassette Coil group 62 Second cassette coil group

Claims (1)

A bending portion is formed at the coil end in the direction in which the winding end portion connecting the layers of the cassette coil is not arranged, and the bent portion is composed of a plurality of cassette coils arranged on the upper side in the stator axial direction. 1 cassette coil group and
A plurality of cassette coils in which the bent portion is arranged on the lower side in the stator axial direction and formed short in the stator axial direction, and a plurality of cassette coils in which the bent portion is arranged on the lower side in the stator axial direction and formed long in the stator axial direction. A second cassette coil group composed of a cassette coil and a second cassette coil group formed by alternately and continuously arranging the cassette coils is provided.
A stator in which the cassette coils constituting the first cassette coil group and the cassette coils forming the second cassette coil group are alternately arranged so as to enter the turns of the cassette coils of each other.

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