CN113454881B

CN113454881B - Stator, motor and compressor

Info

Publication number: CN113454881B
Application number: CN201980091705.XA
Authority: CN
Inventors: 荒井利夫; 矢部浩二
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2019-02-22
Filing date: 2019-02-22
Publication date: 2024-09-06
Anticipated expiration: 2039-02-22
Also published as: WO2020170422A1; JP7113957B2; CZ309363B6; CZ2021374A3; JPWO2020170422A1; CN113454881A

Abstract

The stator of the present invention comprises: a stator core having a hollow cylindrical shape and having a plurality of slots arranged at predetermined intervals in the circumferential direction on the inner circumferential side; and a winding which is a distributed winding wire wound through the slots and is concentric, the number of slots per each pole is 1, the winding of the same phase includes coils of the same number as the number of poles, one half of the coils is an outer circumference side coil and is arranged at a position closer to an outer circumference side than an inner Zhou Cexian coil which is the other half of the coils, the outer circumference side coil and the inner circumference side coil are alternately arranged along the circumferential direction, when the adjacent outer circumference side coil and inner circumference side coil are observed, a part of the outer circumference side coil and a part of the inner circumference side coil are accommodated in the same slot, and coil ends of the coils of the winding constituting the same layer are arranged in a circular ring shape.

Description

Stator, motor and compressor

Technical Field

The present invention relates to a stator having windings with distributed windings, a motor having the stator, and a compressor having the motor.

Background

A compressor used in the refrigeration cycle apparatus includes a motor such as a synchronous motor. The motor includes a hollow cylindrical stator around which a winding is wound, and a rotor disposed on an inner peripheral side of the stator. In many cases, concentrated winding is used in the winding method of the stator winding of such a motor (see patent document 1). This is because the concentrated winding can reduce the coil end and reduce the resistance of the winding compared to the distributed winding. On the other hand, if the motor body size is increased to increase the output of the motor with the increase in the capacity of the compressor, there is a case where distributed winding is more advantageous than concentrated winding. This is because the distributed winding has a higher winding coefficient than the concentrated winding, and the magnetic flux of the rotor can be effectively utilized. Therefore, in motors of compressors requiring a large capacity, stators having windings with distributed winding are often used.

Patent document 1: japanese patent laid-open No. 2008-061443

In recent years, motors such as synchronous motors and induction motors are required to have smaller size and higher performance. In order to achieve miniaturization of a high-performance motor including a stator having windings with distributed winding, for example, the following methods have been proposed: a waveform winding is used in which a coil is wound around a stator core without forming a loop, and one coil constituting the same phase is disposed in one slot, thereby realizing miniaturization of the coil circumference and reduction of the resistance value of the coil.

However, there is a problem that the reliability of a motor using a winding with a wave winding for a stator is lowered. Specifically, when forming a wave-shaped wound winding, the winding is wound in a circular shape to form a circular coil. Then, a plurality of portions of the outer peripheral portion of the annular coil are pressed inward to form a star-shaped coil having a concave-convex shape. The wave winding may have a reduced insulation performance and reduced reliability due to damage to the insulation film of the winding or the like caused by external force applied to the winding when forming the star coil.

Disclosure of Invention

The present invention has been made to solve the above-described problems, and a first object of the present invention is to obtain a stator that can achieve miniaturization and high performance of a motor and can also suppress a decrease in reliability of the motor. A second object of the present invention is to provide a motor and a compressor each including such a stator.

The stator of the present invention comprises: a stator core having a hollow cylindrical shape and having a plurality of slots arranged at predetermined intervals in the circumferential direction on the inner circumferential side; and a winding which is a distributed winding wire wound through the slots and is concentric, the number of slots per each pole is 1, the winding of the same phase has the same number of coils as the number of poles, half of the coils are outer circumference side coils and are arranged at positions closer to the outer circumference side than the inner Zhou Cexian coils which are the other half of the coils, the outer circumference side coils and the inner circumference side coils are alternately arranged along the circumferential direction, when the adjacent outer circumference side coils and inner circumference side coils are observed, a part of the outer circumference side coils and a part of the inner circumference side coils are accommodated in the same slot, and coil ends of the coils of the winding forming the same layer are arranged in a circular ring shape.

The motor of the present invention includes the stator of the present invention and a rotor disposed on an inner peripheral side of the stator.

The compressor of the present invention includes the motor of the present invention, and a compression mechanism for compressing a refrigerant by a driving force of the motor.

The stator of the present invention includes windings with distributed winding. Further, by disposing the coils of the same phase winding as in the stator of the present invention, the coil ends can be miniaturized, and the resistance value of the winding can be reduced. Therefore, by using the stator of the present invention, the motor can be miniaturized and have high performance. The winding of the stator of the present invention is concentric. When forming a concentric winding, no external force is required to be applied when manufacturing a star coil of a wave winding. Therefore, by using the stator of the present invention, the reliability of the motor can be suppressed from decreasing.

Drawings

Fig. 1 is a perspective view illustrating a stator according to embodiment 1 of the present invention, and is a perspective view showing a part of a stator core and a winding.

Fig. 2 is a perspective view showing an outer peripheral side coil of a U-phase winding in the stator according to embodiment 1 of the present invention.

Fig. 3 is a perspective view showing an inner peripheral side coil of a U-phase winding in the stator according to embodiment 1 of the present invention.

Fig. 4 is a perspective view showing an outer peripheral side coil and an inner peripheral side coil of a U-phase winding in a stator according to embodiment 1 of the present invention.

Fig. 5 is a plan view for explaining a stator according to embodiment 1 of the present invention, and is a perspective view showing a stator core and a U-phase winding.

Fig. 6 is a plan view for explaining a stator according to embodiment 1 of the present invention, and is a perspective view showing a stator core, a U-phase winding, and a V-phase winding.

Fig. 7 is a plan view for explaining a stator according to embodiment 1 of the present invention, and is a perspective view showing a stator core, a U-phase winding, a V-phase winding, and a W-phase winding.

Fig. 8 is a perspective view for explaining a process of inserting a U-phase winding into a slot of a stator core of a stator according to embodiment 1 of the present invention.

Fig. 9 is a perspective view for explaining a process of inserting a U-phase winding into a slot of a stator core of a stator according to embodiment 1 of the present invention.

Fig. 10 is a perspective view for explaining a process of inserting a U-phase winding into a slot of a stator core of a stator according to embodiment 1 of the present invention.

Fig. 11 is an explanatory diagram for explaining a conventional step of forming a winding of a wave winding.

Fig. 12 is an explanatory diagram for explaining a conventional process of forming a concentric winding.

Fig. 13 is a plan view of a stator according to embodiment 1 of the present invention.

Fig. 14 is a plan view of a stator using a conventional concentric winding.

Fig. 15 is a diagram showing an example of a connection structure of a stator according to embodiment 2 of the present invention.

Fig. 16 is a perspective view for explaining an example of a stator according to embodiment 3 of the present invention, and is a perspective view showing a part of a stator core and a winding.

Fig. 17 is a perspective view for explaining a process of winding and forming a U-phase winding of a stator according to embodiment 3 of the present invention.

Fig. 18 is a perspective view for explaining a process of winding and forming a U-phase winding of a stator according to embodiment 3 of the present invention.

Fig. 19 is a perspective view for explaining a process of winding and forming a U-phase winding of a stator according to embodiment 3 of the present invention.

Fig. 20 is a perspective view for explaining another example of a stator according to embodiment 3 of the present invention, and is a perspective view showing a stator core and a U-phase winding.

Fig. 21 is a perspective view for explaining a process of winding and forming the U-phase winding of the stator shown in fig. 20.

Fig. 22 is a perspective view for explaining a process of winding and forming the U-phase winding of the stator shown in fig. 20.

Fig. 23 is a diagram showing an example of the connection structure of the stator shown in fig. 20.

Fig. 24 is a cross-sectional view showing an example of a motor according to embodiment 4 of the present invention.

Fig. 25 is a longitudinal sectional view showing an example of a compressor according to embodiment 5 of the present invention.

Detailed Description

Embodiment 1.

Here, the stator 20 of embodiment 1 includes windings for each phase. Therefore, in the case where the motor using the stator 20 is connected to a three-phase ac power source, a winding of one of three phases is illustrated in fig. 1. In embodiment 1, a case where a motor using the stator 20 is connected to a three-phase ac power supply will be described. Hereinafter, the three phases are referred to as a U phase, a V phase, and a W phase, respectively. As will be described later, the stator 20 of embodiment 1 is arranged in the order of the U-phase winding 7, the V-phase winding 8, and the W-phase winding 9 from the outer peripheral side toward the inner peripheral side of the stator 20. That is, fig. 1 illustrates a U-phase winding 7.

The stator 20 includes a hollow cylindrical stator core 1. The stator core 1 includes a hollow cylindrical back yoke 1a having a through hole 1d formed in a central portion thereof. In the motor using the stator 20, a rotor is disposed in the through hole 1 d. The stator core 1 further includes a plurality of teeth 1b protruding from the inner peripheral surface of the back yoke 1a. Each tooth 1b extends along the axial direction of the through hole 1 d. In other words, each tooth 1b extends in the axial direction of the stator core 1. The teeth 1b are arranged at predetermined intervals in the circumferential direction of the stator core 1. Thereby, a slot 1c is formed between adjacent teeth 1b. That is, the slots 1c are arranged at predetermined intervals along the circumferential direction of the stator core 1 on the inner circumferential side of the stator core 1. The stator core 1 is formed by punching out electromagnetic steel plates into an annular shape and stacking the annular electromagnetic steel plates. The inside of each slot 1c is insulated by a slot film 2.

The number of slots per phase per pole of the stator 20 is 1. The same phase winding has the same number of coils as the number of poles. Specifically, the U-phase winding 7 includes a number of coils equal to the number of poles, the V-phase winding 8 also includes a number of coils equal to the number of poles, and the W-phase winding 9 also includes a number of coils equal to the number of poles. In embodiment 1, a stator 20 having 18 slots 1c and 6 poles in three phases is exemplified. In this case, the U-phase winding 7 includes 6 coils. In addition, the 6 coils are configured with 1 coil for every 3 slots. The same applies to the 6 coils of V-phase winding 8 and W-phase winding 9. The pitch of the slots 1c is 360 degrees by 3/18=60 degrees by mechanical angle, and the winding coefficient is 1.

Fig. 2 is a perspective view showing an outer peripheral side coil of a U-phase winding of a stator according to embodiment 1 of the present invention. Fig. 3 is a perspective view showing an inner peripheral side coil of a U-phase winding of a stator according to embodiment 1 of the present invention. Fig. 4 is a perspective view showing an outer peripheral side coil and an inner peripheral side coil of a U-phase winding of a stator according to embodiment 1 of the present invention.

Hereinafter, the U-phase winding 7 will be described in detail with reference to fig. 2 to 4 and fig. 1. The V-phase winding 8 and the W-phase winding 9 have the same configuration as the U-phase winding 7, and therefore, the description thereof is omitted. In fig. 1 to 4 and the drawings described later in embodiment 1, the crossover wire connecting the coils of the U-phase winding 7, the lead wire of the U-phase winding 7, the crossover wire connecting the coils of the V-phase winding 8, the lead wire of the V-phase winding 8, the crossover wire connecting the coils of the W-phase winding 9, and the lead wire of the W-phase winding 9 are omitted.

The U-phase winding 7 is a distributed winding wound through the slot 1c and is a concentric winding. As described above, the U-phase winding 7 includes 6 coils. Half of the above 6 coils are the outer circumferential coils 3. The remaining half of the 6 coils are inner Zhou Cexian turns 4. The outer Zhou Cexian turns 3 are disposed on the outer peripheral side of the inner peripheral side coil 4. The outer Zhou Cexian turns 3 and the inner periphery side coils 4 are alternately arranged in the circumferential direction of the stator core 1.

Here, as described above, 1 coil is arranged for each 3 slots of the 6 coils of the U-phase winding 7. That is, the outer circumference side coils 3 and the inner circumference side coils 4 are alternately arranged every 3 slots. Therefore, when the adjacent outer peripheral coil 3 and inner peripheral coil 4 are viewed, a part of the outer peripheral coil 3 and a part of the inner peripheral coil 4 are housed in the same slot 1c. In other words, when the outer peripheral side coil 3, the inner peripheral side coil 4, and the slot 1c in which a part of these coils are housed are viewed from the inner peripheral side of the stator core 1, the outer peripheral side coil 3 is disposed on the opposite side of the inner peripheral side coil 4 with respect to the slot 1c.

Fig. 5 is a plan view for explaining a stator according to embodiment 1 of the present invention, and is a perspective view showing a stator core and a U-phase winding. Fig. 6 is a plan view for explaining a stator according to embodiment 1 of the present invention, and is a perspective view showing a stator core, a U-phase winding, and a V-phase winding. Fig. 7 is a plan view for explaining a stator according to embodiment 1 of the present invention, and is a perspective view showing a stator core, a U-phase winding, a V-phase winding, and a W-phase winding.

As shown in fig. 5, the U-phase winding 7 provided in the stator core 1 is formed such that the coil end of the inner coil 4 overlaps the coil end of the outer Zhou Cexian turns 3 in a plan view, and the coil ends of the coils constituting the U-phase winding 7 are arranged in a circular shape. The coil end refers to a portion of the coil that is not accommodated in the slot 1 c. Similarly, as shown in fig. 6, the V-phase winding 8 provided on the stator core 1 on the inner peripheral side of the U-phase winding 7 is formed such that the coil end of the inner peripheral side coil 4 overlaps the coil end of the outer Zhou Cexian coil 3 in a plan view, and the coil ends of the coils constituting the V-phase winding 8 are arranged in a circular shape. Similarly, as shown in fig. 7, the W-phase winding 9 provided on the stator core 1 on the inner peripheral side of the V-phase winding 8 is formed such that the coil end of the inner peripheral side coil 4 overlaps the coil end of the outer Zhou Cexian coil 3 in a plan view, and the coil ends of the coils constituting the W-phase winding 9 are arranged in a circular shape.

Next, an example of a process of inserting the U-phase winding 7 into the slot 1c of the stator core 1 will be described. In the step of inserting the V-phase winding 8 into the slot 1c of the stator core 1 and the step of inserting the W-phase winding 9 into the slot 1c of the stator core 1, the same steps as the step of inserting the U-phase winding 7 into the slot 1c of the stator core 1 are omitted.

Fig. 8 to 10 are perspective views for explaining a process of inserting U-phase windings into slots of a stator core of a stator according to embodiment 1 of the present invention.

In fig. 8 to 10, in order to distinguish the 3 outer peripheral coils 3, the 3 outer peripheral coils 3 are respectively shown as an outer peripheral first coil 3a, an outer Zhou Cedi two coils 3b, and an outer Zhou Cedi three coil 3c. Similarly, in fig. 8 to 10, in order to distinguish 3 inner-periphery-side coils 4, 3 inner-periphery-side coils 4 are shown as an inner Zhou Cedi one coil 4a, an inner Zhou Cedi two coil 4b, and an inner-periphery-side third coil 4c, respectively.

As shown in fig. 8 to 10, when the U-phase winding 7 is inserted into the slot 1c of the stator core 1, the coil insertion jig used includes a plurality of rod-shaped insertion blades 13. The insertion blades 13 are arranged in a circular shape.

When inserting the U-phase winding 7 into the slot 1c of the stator core 1, first, the electric wire is wound around a winding die, not shown, to form the inner Zhou Cedi first coil 4a, the inner Zhou Cedi second coil 4b, and the inner peripheral side third coil 4c. Then, as shown in fig. 8, the inner Zhou Cedi first coil 4a, the inner Zhou Cedi second coil 4b, and the inner Zhou Cedi third coil 4c are inserted between the insertion blades 13, and the inner Zhou Cedi first coil 4a, the inner Zhou Cedi second coil 4b, and the inner peripheral side third coil 4c are arranged.

Next, a winding die, not shown, is rotated by 3 slots around a plurality of insertion blades 13 arranged in a circular shape. Then, as shown in fig. 9, the electric wire is wound around a winding die, not shown, to form an outer peripheral side first coil 3a, an outer Zhou Cedi two coils 3b, and an outer Zhou Cedi three coils 3c. Thereafter, as shown in fig. 10, the outer peripheral side first coil 3a, the outer Zhou Cedi second coil 3b, and the outer Zhou Cedi third coil 3c are inserted between the insertion blades 13, and the outer peripheral side first coil 3a, the outer Zhou Cedi second coil 3b, and the outer Zhou Cedi third coil 3c are arranged. This completes the winding of the outer peripheral side coil 3 and the inner peripheral side coil 4 of the U-phase winding 7, and the outer peripheral side coil 3 and the inner peripheral side coil 4 of the U-phase winding 7 are disposed at positions before being inserted into the slot 1 c.

In addition, since the number of turns of the outer Zhou Cexian coil 3 and the inner peripheral side coil 4 is the same in the characteristics of the motor, the resistance values are preferably equal. For example, the outer peripheral coil 3 and the inner peripheral coil 4 are formed of wires having the same diameter, the outer peripheral coil 3 and the inner peripheral coil 4 have the same circumferential length, the number of turns of the outer Zhou Cexian coil 3 and the inner peripheral coil 4 are the same, and the resistance value is the same. For example, one of the outer circumference side coil 3 and the inner circumference side coil 4 is formed of an electric wire having a smaller diameter than the other, and even if the circumference is made shorter than the other, the number of turns of the outer circumference side coil 3 and the inner circumference side coil 4 are the same, and the resistance values are also the same.

Fig. 11 is an explanatory diagram for explaining a conventional step of forming a winding of a wave winding. Fig. 11 shows a process until the winding formation of the winding of the wave winding is completed.

In forming the wave-wound winding, first, as shown in fig. 11 (a), an electric wire is wound in a circular shape to form a circular coil 10. Thereafter, as shown in fig. 11 (b), a plurality of portions of the outer peripheral portion of the annular coil 10 are pressed inward to form a star-shaped coil 11 having a concave-convex shape. Thus, the winding of the winding coil is completed, and the winding coil is inserted into the slot. Since the wave-wound winding is formed in the above-described manner, there are cases where the insulation performance and reliability of the winding are lowered due to damage to the insulation film of the winding or the like by external force applied to the winding when forming the star coil 11.

On the other hand, in fig. 8 to 10, as described above, in the U-phase winding 7 of embodiment 1, no external force is required to be applied when manufacturing the star coil 11 of the wave-wound winding in the process before the completion of winding formation. Therefore, the U-phase winding 7 according to embodiment 1 can suppress damage to the insulating film of the winding and the like, and the insulating performance is reduced. Similarly, the V-phase winding 8 and the W-phase winding 9 according to embodiment 1 can suppress deterioration of insulation performance such as damage of the insulation film of the winding. That is, the stator 20 and the motor using the stator 20 can be suppressed from being degraded in reliability.

Referring again to fig. 10, as described above, fig. 10 shows a state in which the winding of the outer peripheral side coil 3 and the inner peripheral side coil 4 of the U-phase winding 7 is completed, and the outer peripheral side coil 3 and the inner peripheral side coil 4 of the U-phase winding 7 are arranged at positions before being inserted into the slot 1c. After the outer peripheral side coil 3 and the inner peripheral side coil 4 of the U-phase winding 7 are brought into the state of fig. 10, the outer peripheral side coil 3 and the inner peripheral side coil 4 are inserted into the slot 1c using the insertion stripper 14 of the coil insertion jig shown in fig. 10. Specifically, first, the stator core 1 is disposed above the outer circumference side coil 3 and the inner circumference side coil 4. Thereafter, the insertion and separation member 14 disposed below the outer peripheral side coil 3 and the inner peripheral side coil 4 is lifted, and the outer peripheral side coil 3 and the inner peripheral side coil 4 are lifted up by the insertion and separation member 14. Thereby, the outer peripheral side coil 3 and the inner peripheral side coil 4 are inserted into the slot 1c. In addition, a part or the whole of the insertion blade 13 may be fixed to the insertion stripper 14, and the insertion blade 13 may be moved together with the insertion stripper 14 when the outer circumference side coil 3 and the inner circumference side coil 4 are lifted up.

Conventional concentric winding windings having 18 slots and three phases provided in a 6-pole stator are provided with 3 coils 12 for each phase. Fig. 12 shows 3 coils 12 of a conventional U-phase winding wound concentrically.

When inserting a conventional U-phase winding wound concentrically into a slot of a stator core, first, an electric wire is wound around a winding die, not shown, to form 3 coils 12. Then, as shown in fig. 12, each coil 12 is inserted between insertion blades 13 arranged in a circular shape. Thereafter, each coil 12 is lifted up by an unillustrated insertion stripper 14, and each coil 12 is inserted into the slot. As described above, the U-phase winding 7, the V-phase winding 8, and the W-phase winding 9 of the stator 20 of embodiment 1 can be inserted into the slot 1c of the stator core 1 using the same coil insertion jig as in the prior art.

As described above, in fig. 8 to 10, when the outer circumference side coil 3 and the inner circumference side coil 4 of the U-phase winding 7 are inserted into the slot 1c, the coil end of the U-phase winding 7 is formed in a circular shape, and the state shown in fig. 5 is obtained. As described above, when the outer circumference side coil 3 and the inner circumference side coil 4 of the V-phase winding 8 are inserted into the slot 1c from this state, the coil end of the V-phase winding 8 is formed in an annular shape, and the state shown in fig. 6 is obtained. As described above, when the outer circumference side coil 3 and the inner circumference side coil 4 of the W-phase winding 9 are inserted into the slot 1c from this state, the coil end of the W-phase winding 9 is formed in an annular shape, and the state shown in fig. 7 is obtained. At least 2 of the U-phase winding 7, the V-phase winding 8, and the W-phase winding 9 may be inserted into the slot 1c at the same time, and the coil ends of these windings may be formed in an annular shape.

Fig. 13 is a plan view of a stator according to embodiment 1 of the present invention. Fig. 14 is a plan view of a stator using a conventional concentric winding.

As shown in fig. 14, in a stator using a conventional concentric winding, the width of the coil of the same phase winding in plan view is L. In other words, in the stator using the conventional concentric winding, the diameter of the coil of the winding of the same phase is L. In this case, in the stator using the conventional concentric winding, the width of the coil end of the same-phase winding in plan view is also L. Further, in the stator using the conventional concentric winding, the coil ends of the windings of at most 2 phases overlap each other in the radial direction of the stator core. Therefore, the width of the coil end of the stator using the conventional concentric winding is 2L at the maximum in plan view.

On the other hand, in the stator 20 of embodiment 1, the number of coils of the same phase winding is 2 times that of the conventional one. Therefore, in the stator 20 of embodiment 1, the number of turns of the coil of the same-phase winding is half of that of the conventional one, and the width of the coil of the same-phase winding in plan view is L/2. Therefore, in the stator 20 of embodiment 1, when the length in the axial direction of the stator core 1 of the coil of the same-phase winding is the same as in the conventional case, the width in plan view of the coil end of the same-phase winding is L/2. In the stator 20 of embodiment 1, the coil ends of the windings of 3 phases overlap each other in the radial direction of the stator core 1. Therefore, in the stator 20 of embodiment 1, the width of the coil end in plan view is 3L/2. As described above, the stator 20 according to embodiment 1 can reduce the coil end compared with a stator using a conventional concentric winding. Therefore, the stator 20 of embodiment 1 can reduce the resistance value of the winding compared to a stator using a conventional concentric winding. That is, the stator 20 of embodiment 1 can achieve a smaller size and higher performance of the motor than a stator using a conventional concentric winding.

In addition, the same case where the length in the axial direction of the stator core 1 of the coil of the same-phase winding is the same as the conventional case is: the coil end of the outer circumferential coil 3 and the coil end of the inner circumferential coil 4 are overlapped in the axial direction of the stator core 1, and the length in the axial direction of the stator core 1 of the coil end of the same phase winding is L.

As described above, the stator 20 of embodiment 1 has a hollow cylindrical shape, and includes the stator core 1 having the plurality of slots 1c arranged at predetermined intervals in the circumferential direction on the inner circumferential side, and the windings wound concentrically and with distributed windings wound through the slots 1 c. The stator 20 of embodiment 1 has 1 slot number per pole per phase, and the windings of the same phase have the same number of coils as the number of poles. Further, one half of the coils of the same phase winding is the outer peripheral side coil 3, and is disposed on the outer peripheral side of the inner peripheral side coil 4 which is the remaining half of the coils of the same phase winding. The outer Zhou Cexian turns 3 and the inner periphery side coils 4 are alternately arranged in the circumferential direction of the stator core 1. When the adjacent outer peripheral coil 3 and inner peripheral coil 4 are viewed, a part of the outer peripheral coil 3 and a part of the inner peripheral coil 4 are housed in the same slot 1c, and coil ends of coils constituting the same layer of windings are arranged in a circular shape.

The stator 20 of embodiment 1 includes windings in which winding wires are distributed. Further, as in the stator 20 of embodiment 1, by disposing the coils of the same phase winding, the coil end portions can be made smaller, and the coil circumference can be shortened, so that the resistance value of the winding can be reduced. Therefore, by using the stator 20 according to embodiment 1, the motor can be miniaturized and have high performance. The windings of the stator 20 of embodiment 1 are concentric windings. When forming the concentric winding, no external force is required to be applied when manufacturing the star coil of the wave winding. Therefore, by using the stator 20 according to embodiment 1, a decrease in reliability of the motor can be suppressed.

In addition, the stator 20 of embodiment 1 can be made smaller in coil end than a stator using a conventional concentric winding, and therefore can also reduce the amount of electric wires used. Therefore, the stator 20 of embodiment 1 can be manufactured at a lower cost than a stator using a conventional concentric winding.

Further, since the stator 20 of embodiment 1 uses concentric windings, it has both the advantage of waveform winding that can shorten the coil circumference and the advantage of overlap winding that can miniaturize the coil end, and can be manufactured at a lower cost than a stator using windings of waveform winding and overlap winding. Specifically, in order to form the wave-wound winding, as described above, a step of forming the star-shaped coil 11 is required in addition to a step of winding the electric wire to form the annular coil 10. Therefore, the winding device forming the wave-shaped winding is enlarged, and the occupancy of the production field is increased. Further, the structure of the jig for forming the star coil 11 is complicated. Therefore, when manufacturing stators having different numbers of slots, it is not easy to perform operations such as changing the number of jigs forming the concave-convex portions of the star coil 11. Therefore, the stator using the wave-wound winding becomes expensive.

In order to form a winding with superimposed windings, the method includes a step of dividing winding units, in which an electric wire is wound in a spiral shape, by a predetermined number of windings. In order to form the winding of the superimposed winding, it is necessary to arrange the positions of 2 coils inserted into the same slot of the stator core regularly on the outer peripheral side and the inner peripheral side. Therefore, the coil-to-coil insertion jig needs to be regularly arranged in the same state together with all the coils. The correction of the coil position when the coil is mounted by inserting the jig into the coil is performed manually or by a costly winding device having a correction mechanism with a complicated structure. Therefore, the stator using the winding wound in an overlapping manner is expensive.

On the other hand, the stator 20 of embodiment 1 can be directly used in a conventionally existing concentric winding device and jig. In addition, the structure of the jig itself used when winding the concentric winding coil is simple. The stator core 1 is different in shape, and can cope with the change in the number of slots 1c by exchanging the clamps with a simple structure such as the coil insertion clamp described above, which is inexpensive. The winding machine has versatility capable of coping with various kinds of machines. Therefore, since the stator 20 of embodiment 1 uses the concentric winding, it has both the advantage of the wave winding that can shorten the coil circumference and the advantage of the overlap winding that can miniaturize the coil end, and can be manufactured at a lower cost than the stator using the wave winding and the overlap winding.

Embodiment 2.

In embodiment 2, an example of the connection structure of each coil of the stator 20 shown in embodiment 1 will be described. In embodiment 2, the same items not described in particular are described with the same reference numerals as those of embodiment 1, and the same functions and structures as those of embodiment 1 are described.

As shown in fig. 1 and 4, when the number of slots 1c is 18, the U-phase winding 7, the V-phase winding 8, and the W-phase winding 9 each include 3 outer peripheral side coils 3 and 3 inner peripheral side coils 4. As shown in fig. 15, the outer peripheral coils 3 of the same phase are connected to the adjacent outer peripheral coils 3 by crossover wires 3 f. In other words, the outer peripheral windings 3 of the same phase are connected in series by the crossover 3f, respectively. Specifically, in each of the outer peripheral coils 3 of the same phase, the lead-out wire of the outer Zhou Cedi coil 3a and the lead-out wire of the outer Zhou Cedi two coils 3b are connected by the crossover wire 3 f. In each of the outer peripheral coils 3 of the same phase, the lead-out wire of the outer Zhou Cedi two coils 3b and the lead-out wire of the outer peripheral side third coil 3c are connected by the crossover wire 3 f.

As shown in fig. 15, the inner-peripheral-side coils 4 of the same phase are connected to the adjacent inner-peripheral-side coils 4 by crossover wires 4 f. In other words, the inner coils 4 of the same phase are connected in series by crossover wires 4 f. Specifically, in each of the inner-periphery-side coils 4 of the same phase, the lead wire of the inner-periphery-side first coil 4a and the lead wires of the inner Zhou Cedi two coils 4b are connected by the crossover wire 4 f. In each of the inner peripheral side coils 4 of the same phase, the lead wire of the inner Zhou Cedi two coils 4b and the lead wire of the inner peripheral side third coil 4c are connected by the crossover wire 4 f.

The lead wires 3e of the outer Zhou Cedi three coils 3c of each phase are short-circuited to each other to form a neutral point 15a. The lead wires 4d of the inner Zhou Cedi a of the respective phases are short-circuited with each other to form a neutral point 15b. In embodiment 2, the lead wire 3e of the outer-peripheral-side third coil 3c is a lead wire from which winding of the outer-peripheral-side third coil 3c is completed. The lead wire 4d of the inner Zhou Cedi a coil 4a becomes a lead wire from which winding of the inner Zhou Cedi a coil 4a starts.

The lead wire 3d of the outer peripheral side first coil 3a and the lead wire 4e of the inner peripheral side third coil 4c of the same phase are short-circuited, and the short-circuited portion is connected to a power supply via a lead wire 16. Specifically, in the U-phase winding 7, the lead wire 3d of the outer peripheral side first coil 3a and the lead wire 4e of the inner peripheral side third coil 4c are short-circuited, and the short-circuited portion is connected to a power supply via the U-phase lead wire 16 a. In the V-phase winding 8, the lead wire 3d of the outer-peripheral-side first coil 3a and the lead wire 4e of the inner-peripheral-side third coil 4c are short-circuited, and the short-circuited portion is connected to a power supply via the V-phase lead wire 16 b. In the W-phase winding 9, the lead wire 3d of the outer-peripheral-side first coil 3a and the lead wire 4e of the inner-peripheral-side third coil 4c are short-circuited, and the short-circuited portion is connected to a power supply via the W-phase lead wire 16 c. In embodiment 2, the lead wire 3d of the outer-peripheral-side first coil 3a serves as a lead wire from which winding of the outer-peripheral-side first coil 3a starts. The lead wire 4e of the inner peripheral side third coil 4c becomes a lead wire at which the winding of the inner Zhou Cedi three coils 4c is completed.

As described above, each coil of the stator 20 according to embodiment 2 has a 3-phase Y-wire structure based on 2 parallel circuits. The 3-phase Y-connection based on 2 parallel circuits is sometimes also described as the 2// Y-connection.

As shown in fig. 12, the conventional concentric winding coil provided in a 6-pole stator with three phases has 18 slots, and the number of windings of each phase is an odd number of 3 coils. Therefore, in a stator using such a conventional concentric winding, each coil has a Y-wire structure in which coils of the same phase are connected in series, or a 3-phase Y-wire structure in which coils of the same phase are connected in parallel, the 3-phase Y-wire structure being based on 3 parallel circuits. The 3-phase Y-connection based on 3 parallel circuits is sometimes also described as 3// Y-connection. That is, in the stator using such conventional concentric winding, the wiring structure of each coil has only two types of options.

On the other hand, in the stator 20 of embodiment 2, each of the windings of each phase has an even number of 6 coils. Therefore, in the stator 20 of embodiment 2, a 2// Y connection structure can be adopted as described above in addition to the connection structure of the stator using the conventional concentric winding. Therefore, the stator 20 configured as in embodiment 2 has an effect of increasing the degree of freedom in design by increasing options of the connection structure of each coil in addition to the effect shown in embodiment 1.

Embodiment 3.

In embodiment 3, a method of forming a plurality of outer peripheral coils 3 by winding a plurality of outer peripheral coils 3 of the same phase without cutting each outer peripheral coil 3, and forming a crossover 3f by an electric wire at the time of winding will be described. Similarly, in embodiment 3, a method of forming a plurality of inner peripheral side coils 4 by forming crossover wires 4f by electric wires at the time of winding a plurality of inner peripheral side coils 4 of the same phase without cutting the space between the inner peripheral side coils 4 will be described. In embodiment 3, a preferred arrangement of the lead wires connected to the power supply in the outer-periphery-side coil 3 and the inner-periphery-side coil 4 will be described. In embodiment 3, the same functions and structures as those in embodiment 1 or embodiment 2 will be described with the same reference numerals as those in embodiment 1 or embodiment 2, except that items not specifically described are the same as those in embodiment 1 or embodiment 2.

In embodiment 3, the winding shown in fig. 16 is U-phase winding 7.

As shown in fig. 16, the outer peripheral side first coil 3a and the outer Zhou Cedi both coils 3b are connected by a crossover 3 f. The outer Zhou Cedi two-coil 3b and the outer Zhou Cedi three-coil 3c are connected by a crossover 3 f. When the outer peripheral first coil 3a, the outer Zhou Cedi second coil 3b, and the outer peripheral third coil 3c are wound, these crossover wires 3f are formed continuously without cutting the electric wire between the coils.

Similarly, the inner Zhou Cedi first coil 4a and the inner Zhou Cedi second coil 4b are connected by a crossover wire 4 f. The inner Zhou Cedi two-coil 4b and the inner Zhou Cedi three-coil 4c are connected by a crossover wire 4 f. These crossover lines 4f are formed by: when the inner Zhou Cedi first coil 4a, the inner Zhou Cedi second coil 4b, and the inner peripheral side third coil 4c are wound, the coils are continuously formed without cutting the electric wire between the coils.

Specifically, the outer peripheral side coil 3 and the inner peripheral side coil 4 are wound as described below.

Fig. 17 to 19 are perspective views for explaining a process of winding and forming a U-phase winding of a stator according to embodiment 3 of the present invention.

The step of winding the V-phase winding 8 and the W-phase winding 9 is similar to the step of winding the U-phase winding 7.

As shown in fig. 17, first, an electric wire portion to be the lead wire 4d is left, and the electric wire is wound around a winding die, not shown, to form the inner Zhou Cedi coil 4a. Then, the inner peripheral side first coil 4a is inserted between the insertion blades 13. Next, a winding die, not shown, is rotated around a plurality of insertion blades 13 arranged in a circular shape. After the inner Zhou Cedi first coil 4a is formed, the electric wire is wound around a winding die, not shown, without cutting the electric wire, to form an inner Zhou Cedi second coil 4b. Furthermore, the inner Zhou Cedi two coils 4b are inserted between the insertion blades 13. Next, a winding die, not shown, is rotated around a plurality of insertion blades 13 arranged in a circular shape. Then, after the inner Zhou Cedi two coils 4b are formed, the electric wire is wound around a winding die, not shown, without cutting the electric wire, to form the inner Zhou Cedi three coils 4c. Further, the inner peripheral side third coil 4c is inserted between the insertion blades 13. Finally, after the inner peripheral side third coil 4c is inserted between the insertion blades 13, the electric wire portion serving as the lead wire 4e is left and the electric wire is cut.

Next, as shown in fig. 18 and 19, the outer peripheral side first coil 3a, the outer Zhou Cedi two coils 3b, and the outer Zhou Cedi three coils 3c are wound, and these coils are inserted between the insertion blades 13. Specifically, the electric wire portion serving as the lead wire 3d is left, and the electric wire is wound around a winding die, not shown, to form the outer-peripheral-side first coil 3a. Then, the outer peripheral side first coil 3a is inserted between the insertion blades 13. Next, a winding die, not shown, is rotated around a plurality of insertion blades 13 arranged in a circular shape. After the outer Zhou Cedi a coil 3a is formed, the electric wire is wound around a winding die, not shown, without cutting the electric wire, to form an outer peripheral side second coil 3b. Then, the outer Zhou Cedi two coils 3b are inserted between the insertion blades 13. Next, a winding die, not shown, is rotated around a plurality of insertion blades 13 arranged in a circular shape. After the outer Zhou Cedi two coils 3b are formed, the electric wire is wound around a winding die, not shown, without cutting the electric wire, to form an outer peripheral side third coil 3c. Then, the outer peripheral side third coil 3c is inserted between the insertion blades 13. Finally, after the outer peripheral side third coil 3c is inserted between the insertion blades 13, the electric wire portion to be the lead-out wire 3e is left and the electric wire is cut. As a result, the outer peripheral side coil 3 and the inner peripheral side coil 4 are arranged as shown in fig. 19.

In fig. 18, after the winding of the outer peripheral side first coil 3a, the outer Zhou Cedi two coils 3b, and the outer peripheral side third coil 3c is completed, these coils are not inserted between the blades 13. Fig. 18 is a view showing an image after the completion of winding of the outer peripheral side first coil 3a, the outer Zhou Cedi two coils 3b, and the outer peripheral side third coil 3 c. In fact, as described above, each of the outer Zhou Cedi two coils 3b and the outer peripheral side third coil 3c is inserted between the insertion blades 13 after the completion of winding formation of one coil.

As shown in fig. 19, after the outer peripheral side coil 3 and the inner peripheral side coil 4 are arranged, as shown in embodiment 1, the outer peripheral side coil 3 and the inner peripheral side coil 4 are inserted into the slot 1c, whereby the stator 20 is in the state shown in fig. 16. In fig. 16, the lead wire 3d of the outer peripheral side coil 3 and the lead wire 4e of the inner peripheral side coil 4 are disposed in the same slot 1c.

The phase of the outer circumferential coil 3 with respect to the inner circumferential coil 4 may be different from that of fig. 16 with the axial center of the stator core 1 as the rotation center.

The stator 20 shown in fig. 16 has an outer Zhou Cedi two-coil 3b arranged between an inner circumference side first coil 4a and an inner Zhou Cedi two-coil 4 b. In contrast, the stator 20 shown in fig. 20 has an outer Zhou Cedi coil 3a arranged between an inner circumference side first coil 4a and an inner Zhou Cedi two coils 4 b. Such an outer peripheral side coil 3 and an inner peripheral side coil 4 are wound as follows.

Fig. 21 and 22 are perspective views for explaining a process of winding the U-phase winding of the stator shown in fig. 20.

The winding of the outer peripheral side coil 3 and the inner peripheral side coil 4 in the U-phase winding 7 of the stator 20 shown in fig. 20 is performed in the same manner as in the steps shown in fig. 17 to 19 except for the arrangement position of the outer peripheral side coil 3 with respect to the inner peripheral side coil 4. Specifically, in the steps shown in fig. 17 to 19, the outer Zhou Cedi two coils 3b are arranged between the inner Zhou Cedi one coil 4a and the inner Zhou Cedi two coils 4 b. On the other hand, as shown in fig. 21 and 22, in the winding formation step of the outer peripheral coil 3 in the U-phase winding 7 of the stator 20 shown in fig. 20, the outer coil Zhou Cedi a is arranged between the inner Zhou Cedi one coil 4a and the inner Zhou Cedi two coils 4 b.

After the outer peripheral side coil 3 and the inner peripheral side coil 4 are arranged as shown in fig. 22, the outer peripheral side coil 3 and the inner peripheral side coil 4 are inserted into the slot 1c as shown in embodiment 1, whereby the stator 20 is in the state shown in fig. 20. In fig. 20, the lead wire 3e of the outer peripheral side coil 3 and the lead wire 4d of the inner peripheral side coil 4 are disposed in the same slot 1c.

As in the stator 20 of embodiment 3, the lead wires of the outer Zhou Cexian turns 3 and the lead wires of the inner-peripheral-side coil 4 are arranged in the same slot 1c, whereby the following effects can be obtained.

In the stator 20 shown in fig. 16, the lead wires 4e of the inner third coil 4c and the lead wires 3d of the outer first coil 3a disposed in the same slot 1c are disposed at the inner Zhou Cedi three-coil 4 c-side end 3g of the radial end portions of the stator core 1 in the outer first coil 3a. The lead wire 3d of the outer peripheral side first coil 3a and the lead wire 4e of the inner peripheral side third coil 4c disposed in the same slot 1c are disposed at the outer Zhou Cedi coil 3a side end 4g of the radial direction end of the stator core 1 in the inner peripheral side third coil 4 c.

When the coils of the stator 20 shown in fig. 16 are wired as shown in fig. 15, the lead wires 3d of the outer peripheral side first coil 3a and the lead wires 4e of the inner Zhou Cedi three coils 4c of the same phase can be regarded as one lead wire to perform the wiring operation. Therefore, the insulating member used in the connection between lead wire 3d and lead wire 4e and the connection between lead wire 3d and lead wire 4e can be reduced. Therefore, when the coils of the stator 20 shown in fig. 16 are wired as shown in fig. 15, the workability of assembling the stator 20 is improved, and the stator 20 can be manufactured at low cost.

In the stator 20 shown in fig. 20, the lead wire 4d of the inner Zhou Cedi one coil 4a and the lead wire 3e of the outer peripheral side third coil 3c arranged in the same slot 1c are arranged at an end 3h on the opposite side of the inner Zhou Cedi one coil 4a side from among the radial ends of the stator core 1 in the outer peripheral side third coil 3 c. The lead wire 3e of the outer third coil 3c and the lead wire 4d of the inner first coil 4a disposed in the same slot 1c are disposed at an end 4h on the opposite side of the outer Zhou Cedi three coils 3c side from among the radial end portions of the stator core 1 in the inner first coil 4 a.

When the current capacity of the motor is large, a plurality of coils constituting the same phase may be connected to a power supply through a plurality of wires. For example, each coil of the stator 20 shown in fig. 20 may be wired as shown in fig. 23. Specifically, the lead wire 3e of the outer Zhou Cedi coil 3c and the lead wire 4d of the inner-peripheral first coil 4a of the same phase may be connected to a power supply through different leads 16. In this case, by configuring the stator 20 as shown in fig. 20, the distinction between the lead wire 3e and the lead wire 4d becomes clear, and therefore, it is possible to suppress the erroneous lead wire 16 from being connected to the lead wire 3e and the lead wire 4d, and to easily connect the correct lead wire 16 to the lead wire 3e and the lead wire 4 d.

Therefore, when the coils of the stator 20 shown in fig. 20 are wired as shown in fig. 23, the workability of assembling the stator 20 is improved, and the stator 20 can be manufactured at low cost. In addition, when the coils of the stator 20 shown in fig. 20 are wired as shown in fig. 23, the reliability of the stator 20 can be improved. Here, when the outer peripheral coil 3 and the inner peripheral coil 4 are made of wires having different diameters, currents having different magnitudes are supplied to the outer peripheral coil 3 and the inner peripheral coil 4. Therefore, it is easy to connect the correct lead wire 16 to the lead wire 3e and the lead wire 4d, which is particularly useful when the outer peripheral coil 3 and the inner peripheral coil 4 are constituted by electric wires having different diameters.

Embodiment 4.

In embodiment 4, an example of an electric motor using the stator 20 according to any one of embodiments 1 to 3 will be described. In embodiment 4, items not specifically described are described with the same reference numerals as those in any of embodiments 1 to 3, and functions and structures similar to those in any of embodiments 1 to 3 are described with the same reference numerals.

Fig. 24 is a cross-sectional view showing an example of a motor according to embodiment 4 of the present invention. Fig. 24 is a cross-sectional view of the motor 30 cut off on an imaginary plane parallel to the rotation center of the rotor 31.

The motor 30 includes the stator 20 according to any one of embodiments 1 to 3, and the rotor 31 rotatably disposed on the inner peripheral side of the stator 20. A through hole 31a for fixing the output shaft is formed along the rotation center of the rotor 31 at the center of the rotor 31. The motor 30 is, for example, a synchronous motor having a rotor 31 provided with permanent magnets. When a current flows through the U-phase winding 7, V-phase winding 8, and W-phase winding 9 of the stator 20, a magnetic field is generated, and torque is generated in the rotor 31 by the magnetic field. Thereby, the rotor 31 rotates.

As described above, the motor 30 according to embodiment 4 includes the stator 20 according to any one of embodiments 1 to 3. Therefore, the motor 30 can be reduced in size and improved in performance, and also can be suppressed from being reduced in reliability.

Embodiment 5.

In embodiment 5, an example of a compressor using the motor 30 shown in embodiment 4 will be described. In embodiment 5, the same items not described in particular as those in any of embodiments 1 to 4 will be described with the same reference numerals as those in any of embodiments 1 to 4, and the same functions and structures as those in any of embodiments 1 to 4 will be described.

The compressor 40 includes the motor 30 and the compression mechanism 41 shown in embodiment 4. The motor 30 and the compression mechanism 41 are connected by a drive shaft 42 fixed to the rotor 31. The drive shaft 42 is an output shaft fixed to the through hole 31a of the rotor 31 shown in fig. 24. The compressor 40 further includes a closed vessel 43. The motor 30, the compression mechanism 41, and the drive shaft 42 are housed in a sealed container 43.

When a current flows through the U-phase winding 7, V-phase winding 8, and W-phase winding 9 of the stator 20, a magnetic field is generated, and torque is generated in the rotor 31 by the magnetic field. Whereby the rotor 31 rotates. The driving force of the motor 30 is transmitted to the compression mechanism 41 via a driving shaft 42 fixed to the rotor 31 and rotating together with the rotor 31. The compression mechanism 41 sucks the refrigerant into the interior by the driving force of the motor 30, and compresses the sucked refrigerant. Specifically, when the driving force of the motor 30 is transmitted to the compression mechanism 41, the refrigerant is sucked into the compression mechanism 41 through the suction pipe 44. The sucked refrigerant is compressed by the compression mechanism 41, and then discharged from the compression mechanism 41 into the closed casing 43. The discharged refrigerant passes between the stator 20 and the rotor 31, and the like, and then flows out of the compressor 40 from the discharge pipe 45.

The compression mechanism 41 of embodiment 5 is a double-rotary type compression mechanism, but the type of the compression mechanism 41 is arbitrary. Various known compression mechanisms such as a single-rotation type compression mechanism, a scroll type compression mechanism, and a screw type compression mechanism can be used as the compression mechanism 41.

As described above, the compressor 40 according to embodiment 5 includes the motor 30 according to embodiment 4. Therefore, the compressor 40 can be made smaller and higher in performance, and the reliability can be suppressed from decreasing.

As shown in fig. 13, the gap between the coil ends of the coils of the stator 20 of the motor 30 is reduced. Therefore, the coil ends of the coils are gathered so that the inner diameter side wall becomes cylindrical. Therefore, the flow of the refrigerant passing between the stator 20 and the rotor 31 becomes smooth. By improving the flow of refrigerant passing between the stator 20 and the rotor 31, the performance of the compressor 40 of embodiment 5 is improved.

Description of the reference numerals

Stator core; back yoke; teeth; slot; through holes; slot film; a peripheral side coil; a first coil on the outer peripheral side; outer Zhou Cedi two coils; third coil on outer circumference side; 3d. lead out wire; 3e. lead out wire; bonding wire; end part; end part; inner circumference side coil; an inner circumference side first coil; inner Zhou Cedi two coils; a third coil on the inner peripheral side; 4d. lead out wire; 4e. lead out wire; crossover wire; end part; end part; u-phase winding; v phase winding; w-phase winding; annular coil; star coil; a coil; inserting the leaf; inserting a stripper member; neutral point; neutral point; wires; U.S. U. a phase conductor; v.16 b. a phase conductor; w.16 c. a phase conductor; a stator; a motor; a rotor; through holes; 40. compressor; compression mechanism; drive shaft; sealing the container; 44. an inhalation tube; 45. discharge tube.

Claims

1. A stator, comprising:

A stator core having a hollow cylindrical shape and having a plurality of slots arranged at predetermined intervals in the circumferential direction on the inner circumferential side; and

A winding which is a distributed winding wire wound through the slot and is a concentric winding wire,

The number of slots per phase per pole is 1,

The windings of the same phase are provided with the same number of coils as the number of poles,

One half of the coils is an outer peripheral side coil and is disposed on the outer peripheral side of the inner Zhou Cexian turns which are the remaining half of the coils,

The outer circumference side coils and the inner circumference side coils are alternately arranged along the circumferential direction,

When the adjacent outer circumference side coil and inner circumference side coil are observed, a part of the outer circumference side coil and a part of the inner circumference side coil are accommodated in the same slot,

The windings provided in the same phase of the stator core are formed such that coil ends of the inner circumference side coils overlap with coil ends of the outer circumference side coils in a plan view, and coil ends of the coils constituting the windings in the same phase are arranged in a circular shape.

2. The stator as claimed in claim 1, wherein,

The number of turns of the outer circumference side coil and the number of turns of the inner circumference side coil are the same and the resistance values are the same.

3. A stator according to claim 1 or 2, characterized in that,

The winding of the same phase includes a plurality of outer circumference side coils and a plurality of inner circumference side coils,

The outer Zhou Cexian circles are respectively connected with the adjacent outer Zhou Cexian circles through a crossover wire,

The inner Zhou Cexian circles are respectively connected with the adjacent inner Zhou Cexian circles through a crossover wire.

4. A stator according to claim 1 or 2, characterized in that,

The outer circumference side coil and the inner Zhou Cexian coil are provided with lead wires,

The lead wire of the outer peripheral side coil and the lead wire of the inner peripheral side coil are disposed in the same slot.

5. The stator as claimed in claim 4, wherein,

The lead wire of the outer peripheral side coil is arranged at the inner peripheral side coil side end portion among the radial direction end portions of the stator core of the outer peripheral side coil,

The lead wire of the inner peripheral side coil is disposed at the outer peripheral side end portion among the radial direction end portions of the inner peripheral side coil.

6. The stator as claimed in claim 4, wherein,

The lead wire of the outer peripheral side coil is arranged at an end portion of the outer peripheral side coil on the opposite side of the end portion of the stator core in the radial direction from the end portion of the inner peripheral side coil,

The lead wire of the inner peripheral side coil is disposed at an end portion of the radial direction of the inner peripheral side coil opposite to an end portion of the outer peripheral side coil.

7. The stator according to claim 3, wherein the stator is formed of a plurality of pieces,

8. The stator as claimed in claim 7, wherein,

9. The stator as claimed in claim 7, wherein,

10. An electric motor, comprising:

The stator of any one of claims 1-9; and

And a rotor disposed on an inner peripheral side of the stator.

11. A compressor is characterized by comprising:

The motor of claim 10; and

And a compression mechanism for compressing the refrigerant by the driving force of the motor.