JPWO2020170422A1 - Stator, motor and compressor - Google Patents

Abstract

The stator according to the present invention has a hollow cylindrical shape, and has a stator core in which a plurality of slots are arranged at predetermined intervals in the circumferential direction on the inner peripheral side, and a distribution wound through the slots. The windings are concentric with windings, each pole has one phase slot, the same-phase windings have the same number of coils as the number of poles, and half of these coils are on the outer circumference side. It is a coil, and is arranged on the outer peripheral side of the inner peripheral side coil which is the other half of these coils, and the outer peripheral side coil and the inner peripheral side coil are arranged alternately in the circumferential direction. When the adjacent outer peripheral side coil and the inner peripheral side coil are observed, a part of the outer peripheral side coil and a part of the inner peripheral side coil are housed in the same slot, and the said in the same layer. The coil ends of the coils constituting the winding are arranged in an annular shape.

Description

The present invention relates to a stator having a distributed winding winding, an electric motor equipped with the stator, and a compressor equipped with the electric motor.

The compressor used in the refrigeration cycle device includes an electric motor such as a synchronous motor. Further, the electric motor includes a hollow cylindrical stator in which a winding is wound and a rotor arranged on the inner peripheral side of the stator. Concentrated winding is often used for winding the winding of the stator of such an electric motor (see Patent Document 1). This is because the centralized winding can make the coil end smaller and reduce the resistance of the winding as compared with the distributed winding. On the other hand, if the physique of the motor is increased in order to increase the output of the motor as the capacity of the compressor is expanded, the distributed winding may be more advantageous than the 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 used. For this reason, a stator having distributed winding windings is often used in a compressor motor that requires a large capacity.

Japanese Unexamined Patent Publication No. 2008-061443

In recent years, electric motors such as synchronous motors and induction motors are required to be compact and have high performance. Therefore, in order to reduce the size of a high-performance motor equipped with a stator having a distributed winding winding, for example, a wave winding in which a winding is wound around a stator core to form a coil without forming a loop is used. A method has been proposed in which one coil constituting the same phase is arranged in one slot to reduce the coil circumference and the resistance value of the winding.

However, an electric motor using a wave winding winding as a stator has a problem that reliability is lowered. Specifically, when forming a wave winding, the winding is wound in an annular shape to form an annular coil. Then, a plurality of locations on the outer peripheral portion of the annular coil are pushed toward the inner peripheral side to form a star-shaped coil having an uneven shape. The reliability of the wave winding winding may be lowered due to damage to the insulating coating of the winding due to the external force applied to the winding during the formation of the star coil.

The present invention has been made to solve the above-mentioned problems, and it is the first aspect to obtain a stator capable of improving the size and performance of an electric motor and suppressing a decrease in reliability of the electric motor. The purpose of 1. A second object of the present invention is to obtain an electric motor and a compressor provided with such a stator.

The stator according to the present invention has a hollow cylindrical shape, and has a stator core in which a plurality of slots are arranged at predetermined intervals in the circumferential direction on the inner peripheral side, and a distribution wound through the slots. The windings are concentric with windings, each pole has one phase slot, the same-phase windings have the same number of coils as the number of poles, and half of these coils are on the outer circumference side. It is a coil, and is arranged on the outer peripheral side of the inner peripheral side coil which is the other half of these coils, and the outer peripheral side coil and the inner peripheral side coil are arranged alternately in the circumferential direction. When the adjacent outer peripheral side coil and the inner peripheral side coil are observed, a part of the outer peripheral side coil and a part of the inner peripheral side coil are housed in the same slot, and the said in the same layer. The coil ends of the coils constituting the winding are arranged in an annular shape.

Further, the motor according to the present invention includes a stator according to the present invention and a rotor arranged on the inner peripheral side of the stator.

Further, the compressor according to the present invention includes the electric motor according to the present invention and a compression mechanism that compresses the refrigerant by the driving force of the electric motor.

The stator according to the present invention includes a distributed winding winding. Further, by arranging the coils of the windings having the same phase as the stator according to the present invention, the coil end can be miniaturized and the resistance value of the windings can be reduced. Therefore, by using the stator according to the present invention, it is possible to improve the size and performance of the motor. Further, the windings of the stator according to the present invention are concentric windings. When forming a concentric winding, the external force applied when creating a star coil of a wave winding is not required. Therefore, by using the stator according to the present invention, it is possible to suppress a decrease in reliability of the motor.

It is a perspective view for demonstrating the stator which concerns on Embodiment 1 of this invention, and is the perspective view which shows the stator core and a part of windings. It is a perspective view which shows the outer peripheral side coil of the U-phase winding in the stator which concerns on Embodiment 1 of this invention. It is a perspective view which shows the inner peripheral side coil of the U-phase winding in the stator which concerns on Embodiment 1 of this invention. It is a perspective view which shows the outer peripheral side coil and the inner peripheral side coil of the U-phase winding in the stator which concerns on Embodiment 1 of this invention. It is a top view for demonstrating the stator which concerns on Embodiment 1 of this invention, and is the perspective view which shows the stator core and U-phase winding. It is a top view for demonstrating the stator which concerns on Embodiment 1 of this invention, and is the perspective view which shows the stator core, U-phase winding, and V-phase winding. It is a top view for demonstrating the stator which concerns on Embodiment 1 of this invention, and is the perspective view which shows the stator core, U-phase winding, V-phase winding and W-phase winding. It is a perspective view for demonstrating the step of inserting the U-phase winding into the slot of the stator core of the stator which concerns on Embodiment 1 of this invention. It is a perspective view for demonstrating the step of inserting the U-phase winding into the slot of the stator core of the stator which concerns on Embodiment 1 of this invention. It is a perspective view for demonstrating the step of inserting the U-phase winding into the slot of the stator core of the stator which concerns on Embodiment 1 of this invention. It is explanatory drawing for demonstrating the process of forming the winding of a conventional wave winding. It is explanatory drawing for demonstrating the process of forming the winding of the conventional concentric winding. It is a top view of the stator which concerns on Embodiment 1 of this invention. It is a top view of the stator using the conventional concentric winding. It is a figure which shows an example of the connection structure of the stator which concerns on Embodiment 2 of this invention. It is a perspective view for demonstrating an example of the stator which concerns on Embodiment 3 of this invention, and is the perspective view which shows the stator core and a part of windings. It is a perspective view for demonstrating the process of winding and forming the U-phase winding of the stator which concerns on Embodiment 3 of this invention. It is a perspective view for demonstrating the process of winding and forming the U-phase winding of the stator which concerns on Embodiment 3 of this invention. It is a perspective view for demonstrating the process of winding and forming the U-phase winding of the stator which concerns on Embodiment 3 of this invention. It is a perspective view for demonstrating another example of the stator according to Embodiment 3 of this invention, and is the perspective view which shows the stator core and the U-phase winding. It is a perspective view for demonstrating the process of winding and forming the U-phase winding of the stator shown in FIG. It is a perspective view for demonstrating the process of winding and forming the U-phase winding of the stator shown in FIG. It is a figure which shows an example of the connection structure of the stator shown in FIG. It is sectional drawing which shows an example of the electric motor which concerns on Embodiment 4 of this invention. It is a vertical sectional view which shows an example of the compressor which concerns on Embodiment 5 of this invention.

Embodiment 1.
FIG. 1 is a perspective view for explaining a stator according to the first embodiment of the present invention, and is a perspective view showing a stator core and a part of a winding.
Here, the stator 20 according to the first embodiment includes windings for each phase. Therefore, when the motor in which the stator 20 is used is connected to a three-phase AC power supply, FIG. 1 illustrates the winding of one of the three phases. In the first embodiment, the motor in which the stator 20 is used will be described as being connected to a three-phase AC power supply. In the following, each of the three phases will be referred to as a U phase, a V phase and a W phase. Further, as will be described later, the stator 20 according to the first embodiment has a U-phase winding 7, a V-phase winding 8, and a W-phase winding from the outer peripheral side to the inner peripheral side of the stator 20. They are arranged in the order of 9. That is, FIG. 1 illustrates the U-phase winding 7.

The stator 20 includes a stator core 1 having a hollow cylindrical shape. The stator core 1 includes a hollow cylindrical back yoke 1a having a through hole 1d formed in the center thereof. In the motor using the stator 20, the rotor is arranged in the through hole 1d. Further, the stator core 1 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 1d. In other words, each tooth 1b extends along the axial direction of the stator core 1. Further, the teeth 1b are arranged at a predetermined interval in the circumferential direction of the stator core 1. As a result, the slot 1c is formed between the adjacent teeth 1b. That is, each slot 1c is arranged on the inner peripheral side of the stator core 1 at a predetermined interval in the circumferential direction of the stator core 1. The stator core 1 is formed by punching an electromagnetic steel sheet in an annular shape and laminating an annular electromagnetic steel sheet. Further, the inside of each slot 1c is insulated by the slot film 2.

The stator 20 has one slot for each pole and each phase. And the winding of the same phase includes the number of coils equal to the number of poles. Specifically, the U-phase winding 7 has a number of coils equal to the number of poles, the V-phase winding 8 also has a number of coils equal to the number of poles, and the W-phase winding 9 also has a number of poles. It has an equal number of coils. In the first embodiment, the number of slots 1c is 18, and a three-phase, six-pole stator 20 is illustrated. In this case, the U-phase winding 7 includes six coils. Further, these six coils are arranged every three slots. The same applies to the six coils of the V-phase winding 8 and the W-phase winding 9. The pitch of the slot 1c is 360 degrees × 3/18 = 60 degrees in terms of mechanical angle, and the winding coefficient is 1.

FIG. 2 is a perspective view showing an outer peripheral coil of the U-phase winding in the stator according to the first embodiment of the present invention. FIG. 3 is a perspective view showing an inner peripheral coil of the U-phase winding in the stator according to the first embodiment of the present invention. Further, FIG. 4 is a perspective view showing an outer peripheral side coil and an inner peripheral side coil of the U-phase winding in the stator according to the first embodiment of the present invention.
Hereinafter, the details of the U-phase winding 7 will be described with reference to FIGS. 2 to 4 and FIG. 1 described above. Since the configurations of the V-phase winding 8 and the W-phase winding 9 are the same as those of the U-phase winding 7, the description thereof will be omitted. Further, in FIGS. 1 to 4 and the drawings described later in the first embodiment, the crossover wire connecting the coils of the U-phase winding 7, the outlet wire of the U-phase winding 7, and the coil of the V-phase winding 8 The crossing wire connecting the coils, the head wire of the V-phase winding 8, the cross wire connecting the coils of the W-phase winding 9, and the head wire of the W-phase winding 9 are not shown.

The U-phase winding 7 is a distributed winding concentric winding wound through the slot 1c. As described above, the U-phase winding 7 includes six coils. Half of these six coils are the outer coil 3. The other half of these six coils is the inner peripheral coil 4. The outer peripheral coil 3 is arranged on the outer peripheral side of the inner peripheral coil 4. Further, the outer peripheral side coil 3 and the inner peripheral side coil 4 are alternately arranged in the circumferential direction of the stator core 1.

Here, as described above, the six coils of the U-phase winding 7 are arranged every three slots. That is, the outer peripheral side coil 3 and the inner peripheral side coil 4 are alternately arranged every three slots. Therefore, when observing the adjacent outer peripheral side coil 3 and the inner peripheral side coil 4, a part of the outer peripheral side coil 3 and a part of the inner peripheral side 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 them are housed are observed from the inner peripheral side of the stator core 1, the outer peripheral side coil 3 is based on the slot 1c. It is arranged on the side opposite to the inner peripheral side coil 4.

FIG. 5 is a plan view for explaining the stator according to the first embodiment of the present invention, and is a perspective view showing the stator core and the U-phase winding. FIG. 6 is a plan view for explaining a stator according to the first embodiment 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 the first embodiment 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 so that the coil end of the inner peripheral side coil 4 and the coil end of the outer peripheral side coil 3 overlap each other in a plan view. The coil ends of the coils forming the phase winding 7 are arranged in an annular shape. The coil end is a portion of the coil that is not housed in the slot 1c. 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 has the coil end of the inner peripheral coil 4 and the outer peripheral coil in a plan view. It is formed so as to overlap the coil ends of No. 3, and the coil ends of the coils forming the V-phase winding 8 are arranged in an annular 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 has the coil end of the inner peripheral coil 4 and the outer peripheral coil in a plan view. It is formed so as to overlap the coil ends of No. 3, and the coil ends of the coils forming the W-phase winding 9 are arranged in an annular shape.

Subsequently, an example of a step 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 U-phase is inserted into the slot 1c of the stator core 1. Since the process is the same as the step of inserting the winding 7, the description thereof will be omitted.

8 to 10 are perspective views for explaining a step of inserting the U-phase winding into the slot of the stator core of the stator according to the first embodiment of the present invention.
In addition, in FIGS. 8 to 10, in order to distinguish the three outer peripheral side coils 3, each of the three outer peripheral side coils 3 is used as the outer peripheral side first coil 3a, the outer peripheral side second coil 3b, and the outer peripheral side third coil. It is shown as 3c. Similarly, in FIGS. 8 to 10, in order to distinguish the three inner peripheral side coils 4, each of the three inner peripheral side coils 4 is divided into an inner peripheral side first coil 4a, an inner peripheral side second coil 4b, and an inner peripheral side coil 4b. It is shown as the inner peripheral side third coil 4c.

As shown in FIGS. 8 to 10, the coil insertion jig used when inserting the U-phase winding 7 into the slot 1c of the stator core 1 includes a plurality of rod-shaped insertion blades 13. These insertion blades 13 are arranged in an annular shape.

When inserting the U-phase winding 7 into the slot 1c of the stator core 1, first, the electric wire is wound in a winding mold (not shown), and the inner peripheral side first coil 4a, the inner peripheral side second coil 4b, and the inner peripheral side are wound. The third coil 4c is formed. After that, as shown in FIG. 8, the inner peripheral side first coil 4a, the inner peripheral side second coil 4b, and the inner peripheral side third coil 4c are inserted between the insertion blades 13, and the inner peripheral side first coil 4a, The inner peripheral side second coil 4b and the inner peripheral side third coil 4c are arranged.

Next, the winding mold (not shown) is rotated by 3 slots around the plurality of insertion blades 13 arranged in an annular shape. Then, as shown in FIG. 9, the electric wire is wound around a winding mold (not shown) to form the outer peripheral side first coil 3a, the outer peripheral side second coil 3b, and the outer peripheral side third coil 3c. After that, as shown in FIG. 10, the outer peripheral side first coil 3a, the outer peripheral side second coil 3b, and the outer peripheral side third coil 3c are inserted between the insertion blades 13, and the outer peripheral side first coil 3a and the outer peripheral side first coil 3a are inserted. The 2 coils 3b and the 3rd coil 3c on the outer peripheral side are arranged. As a result, the winding formation 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 inserted into the slot 1c. It will be in the state of being placed in the previous position.

Due to the characteristics of the motor, it is desirable that the outer peripheral coil 3 and the inner coil 4 have the same number of turns and the same resistance value. For example, by forming the outer peripheral side coil 3 and the inner peripheral side coil 4 with electric wires having the same diameter and making the outer peripheral side coil 3 and the inner peripheral side coil 4 the same peripheral length, the outer peripheral side coil 3 and the inner peripheral side coil 4 are formed. With 4, the number of turns is the same and the resistance value is the same. Further, for example, by forming one of the outer peripheral side coil 3 and the inner peripheral side coil 4 with an electric wire having a diameter smaller than the other and making the peripheral length shorter than the other, the outer peripheral side coil 3 and the inner peripheral side coil 3 and the inner peripheral side can be formed. The number of turns is the same as that of the coil 4, and the resistance values are the same.

FIG. 11 is an explanatory diagram for explaining a process of forming a conventional wave winding winding. FIG. 11 shows a process until the winding formation of the winding winding of the wave winding is completed.
When forming the winding of the wave winding, first, as shown in FIG. 11A, the electric wire is wound in an annular shape to form the annular coil 10. After that, as shown in FIG. 11B, a plurality of locations on the outer peripheral portion of the annular coil 10 are pushed toward the inner peripheral side to form the star-shaped coil 11 having an uneven shape. As a result, the winding formation of the winding of the wave winding is completed, and the winding is in the state before being inserted into the slot. Since the winding of the wave winding is formed in this way, the insulating coating of the winding is damaged by the external force applied to the winding when the star coil 11 is formed, and the insulation performance is lowered, so that the reliability is lowered. It may end up.

On the other hand, as described above with reference to FIGS. 8 to 10, the U-phase winding 7 according to the first embodiment creates a star-shaped coil 11 of a wave winding winding in the process until the winding formation is completed. No external force is required when doing this. Therefore, the U-phase winding 7 according to the first embodiment can prevent the insulating coating of the winding from being damaged and the insulating performance from being deteriorated. Similarly, the V-phase winding 8 and the W-phase winding 9 according to the first embodiment can prevent the insulating coating of the winding from being damaged and the insulation performance from being deteriorated. That is, it is possible to suppress a decrease in the reliability of the stator 20 and the motor using the stator 20.

Focusing again on FIG. 10, as described above, in FIG. 10, the winding formation 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 of the U-phase winding 7 is completed. And the state where the inner peripheral side coil 4 is arranged at the position before being inserted into the slot 1c is shown. After the outer peripheral side coil 3 and the inner peripheral side coil 4 of the U-phase winding 7 are in the state shown in FIG. 10, the outer peripheral side coil 3 and the inner peripheral side coil 3 and the inner peripheral side are used by using the insertion stripper 14 of the coil insertion jig shown in FIG. The coil 4 is inserted into the slot 1c. Specifically, first, the stator core 1 is arranged above the outer peripheral side coil 3 and the inner peripheral side coil 4. After that, the insertion stripper 14 arranged below the outer peripheral side coil 3 and the inner peripheral side coil 4 is raised, and the outer peripheral side coil 3 and the inner peripheral side coil 4 are pushed up by the insertion stripper 14. As a result, the outer peripheral side coil 3 and the inner peripheral side coil 4 are inserted into the slot 1c. When a part or all of the insertion blade 13 is fixed to the insertion stripper 14 and the outer peripheral side coil 3 and the inner peripheral side coil 4 are pushed up, the insertion blade 13 may be moved together with the insertion stripper 14.

FIG. 12 is an explanatory diagram for explaining a process of forming a conventional concentric winding.
The conventional concentric winding, which has 18 slots and is provided in a three-phase, six-pole stator, has three coils 12 in each of the windings of each phase. FIG. 12 shows three coils 12 of a concentric conventional U-phase winding.

When inserting a concentric conventional U-phase winding into a slot of a stator core, first, an electric wire is wound in a winding mold (not shown) to form three coils 12. Then, as shown in FIG. 12, each coil 12 is inserted between the insertion blades 13 arranged in an annular shape. After that, each coil 12 is pushed up by an insertion stripper 14 (not shown), 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 according to the first embodiment use the same coil insertion jig as the conventional one, and the stator core 1 is used. Can be inserted into slot 1c of.

When the outer peripheral side coil 3 and the inner peripheral side coil 4 of the U-phase winding 7 are inserted into the slot 1c and the coil end of the U-phase winding 7 is formed in an annular shape as described above in FIGS. 8 to 10. The state shown in FIG. 5 is obtained. Further, from this state, as described above, when the outer peripheral side coil 3 and the inner peripheral side coil 4 of the V-phase winding 8 are inserted into the slot 1c and the coil end of the V-phase winding 8 is formed in an annular shape, FIG. The state shown in 6 is obtained. Further, from this state, as described above, when the outer peripheral side coil 3 and the inner peripheral side coil 4 of the W phase winding 9 are inserted into the slot 1c, the coil end of the W phase winding 9 is formed in an annular shape. The state shown in 7 is obtained. At least two 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 the stator according to the first embodiment of the present invention. Further, 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 winding of the same phase in a 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 in the plan view of the coil ends of the windings having the same phase is also L. Further, in the stator using the conventional concentric winding, the coil ends of the windings of two phases overlap at the maximum in the radial direction of the stator core. Therefore, in the stator using the conventional concentric winding, the width of the coil end in a plan view is 2 L at the maximum.

On the other hand, in the stator 20 according to the first embodiment, the number of coils of windings having the same phase is double that of the conventional one. Therefore, in the stator 20 according to the first embodiment, the number of turns of the coil of the winding of the same phase is halved, and the width of the coil of the winding of the same phase in a plan view is L / 2. Therefore, in the stator 20 according to the first embodiment, when the axial length of the stator core 1 in the coil of the winding of the same phase is the same as the conventional one, the coil end of the winding of the same phase The width in plan view is L / 2. Further, in the stator 20 according to the first embodiment, the coil ends of the windings of the three phases overlap in the radial direction of the stator core 1. Therefore, in the stator 20 according to the first embodiment, the width of the coil end in a plan view is 3 L / 2. As described above, the stator 20 according to the first embodiment can make the coil end smaller than the stator using the conventional concentric winding. Therefore, the stator 20 according to the first embodiment can reduce the resistance value of the winding as compared with the stator using the conventional concentric winding. That is, the stator 20 according to the first embodiment can be made smaller and have higher performance than the conventional stator using concentric windings.

In addition, when the axial length of the stator core 1 in the coil of the same phase winding is the same as the conventional case, the coil end of the outer peripheral side coil 3 and the coil end of the inner peripheral side coil 4 are fixed. This is a case where the coil ends of the windings of the same phase are overlapped in the axial direction of the iron core 1 and the length of the stator core 1 in the axial direction is L.

As described above, the stator 20 according to the first embodiment has a hollow cylindrical shape, and the stator core 1 and slots in which a plurality of slots 1c are arranged on the inner peripheral side at predetermined intervals in the circumferential direction. It is a distributed winding wound through 1c and has a concentric winding. Further, the stator 20 according to the first embodiment has one per-pole and one-phase slot number, and windings of the same phase include the same number of coils as the number of poles. Further, half of the coils of the windings of the same phase are the outer peripheral side coils 3, and are arranged on the outer peripheral side of the inner peripheral side coils 4 which are the other half of the coils of the windings of the same phase. .. Further, the outer peripheral side coil 3 and the inner peripheral side coil 4 are alternately arranged in the circumferential direction of the stator core 1. Further, when observing the adjacent outer peripheral side coil 3 and the inner peripheral side coil 4, a part of the outer peripheral side coil 3 and a part of the inner peripheral side coil 4 are housed in the same slot 1c and have the same layer. The coil ends of the coils that make up the windings of are arranged in an annular shape.

The stator 20 according to the first embodiment includes windings of distributed winding. Further, by arranging each coil of the winding of the same phase as in the stator 20 according to the first embodiment, the coil end can be miniaturized and the coil circumference can be shortened, so that the resistance value of the winding can be reduced. Can be reduced. Therefore, by using the stator 20 according to the first embodiment, it is possible to improve the size and performance of the motor. Further, the windings of the stator 20 according to the first embodiment are concentric windings. When forming a concentric winding, the external force applied when creating a star coil of a wave winding is not required. Therefore, by using the stator 20 according to the first embodiment, it is possible to suppress a decrease in the reliability of the motor.

Further, since the stator 20 according to the first embodiment can make the coil end smaller than the stator using the conventional concentric winding, the amount of electric wire used can be reduced. Therefore, the stator 20 according to the first embodiment can be manufactured at a lower cost than the stator using the conventional concentric winding.

Further, since the stator 20 according to the first embodiment uses concentric windings, there are advantages of wave winding that can shorten the coil circumference and advantages of lap winding that can reduce the size of the coil end. It can also be manufactured at a lower cost than a stator that uses corrugated winding and lap winding windings. Specifically, in order to form a wave winding, in addition to the step of winding the electric wire to form the annular coil 10, the step of forming the star coil 11 is also required. For this reason, the winding device for forming the winding of the wave winding becomes large, and the occupancy rate of the production site increases. Further, the jig for forming the star coil 11 has a complicated structure. Therefore, when the stators having different numbers of slots are manufactured, it is not easy to change the number of jigs for forming the uneven portions of the star coil 11. For this reason, a stator using a wave winding winding becomes expensive.

Further, in order to form a lap winding winding, there is a step of dividing a winding unit in which an electric wire is spirally wound into a predetermined winding quantity. Further, in order to form the winding of the lap winding, it is necessary to arrange the positions of the two coils inserted in the same slot of the stator core with regularity on the outer peripheral side and the inner peripheral side. Therefore, when mounting the coil on the coil insertion jig, it is necessary to arrange all the coils in the same state with regularity. The correction of the coil position when mounting the coil on the coil insertion jig is performed manually or by an expensive winding device equipped with a correction mechanism having a complicated structure. For this reason, a stator using a lap winding winding becomes expensive.

On the other hand, as the stator 20 according to the first embodiment, the conventionally existing concentric winding equipment and jigs can be used as they are. Further, the structure of the jig itself used when winding and forming a concentric coil is simple. Further, it is possible to cope with the difference in the shape of the stator core 1 and the change in the quantity of the slots 1c by replacing inexpensive jigs with a simple structure such as the coil insertion jig described above. The winding machine is versatile enough to support multiple models. Therefore, since the stator 20 according to the first embodiment uses concentric windings, the advantage of the wave winding that can shorten the coil circumference and the advantage of the lap winding that can reduce the size of the coil end. It can also be manufactured at a lower cost than a stator that uses corrugated winding and lap winding windings.

Embodiment 2.
In the second embodiment, an example of the connection structure of each coil of the stator 20 shown in the first embodiment will be described. In the second embodiment, items not particularly described will be the same as those in the first embodiment, and the same functions and configurations as those in the first embodiment will be described using the same reference numerals.

FIG. 15 is a diagram showing an example of the connection structure of the stator according to the second embodiment of the present invention.
As shown in FIGS. 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 have three outer coil 3 and 3, respectively. It is provided with two inner peripheral side coils 4. As shown in FIG. 15, each of the outer peripheral side coils 3 having the same phase is connected to the adjacent outer peripheral side coil 3 by a crossover wire 3f. In other words, each of the outer peripheral side coils 3 having the same phase is connected in series by a crossover wire 3f. Specifically, in each of the outer peripheral side coils 3 of the same phase, the outlet wire of the outer peripheral side first coil 3a and the outlet wire of the outer peripheral side second coil 3b are connected by a crossover wire 3f. In each of the outer peripheral side coils 3 of the same phase, the outlet wire of the outer peripheral side second coil 3b and the outlet wire of the outer peripheral side third coil 3c are connected by a crossover wire 3f.

Further, as shown in FIG. 15, each of the inner peripheral side coils 4 having the same phase is connected to the adjacent inner peripheral side coils 4 by a crossover wire 4f. In other words, each of the inner peripheral side coils 4 having the same phase is connected in series by a crossover wire 4f. Specifically, in each of the inner peripheral side coils 4 having the same phase, the outlet wire of the inner peripheral side first coil 4a and the outlet wire of the inner peripheral side second coil 4b are connected by a crossover wire 4f. There is. In each of the inner peripheral side coils 4 having the same phase, the outlet wire of the inner peripheral side second coil 4b and the outlet wire of the inner peripheral side third coil 4c are connected by a crossover wire 4f.

Further, the outlet wires 3e of the third coil 3c on the outer peripheral side of each phase are short-circuited to form a neutral point 15a. The outlet wires 4d of the first coil 4a on the inner peripheral side of each phase are short-circuited to form a neutral point 15b. In the second embodiment, the outlet wire 3e of the outer peripheral side third coil 3c is the outlet wire at the end of winding of the outer peripheral side third coil 3c. The lead wire 4d of the first coil 4a on the inner peripheral side is a lead wire at the start of winding of the first coil 4a on the inner peripheral side.

Further, the outlet wire 3d of the outer peripheral side first coil 3a and the outlet 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 the power supply via the 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 the U-phase lead wire 16a. It is connected to the power supply via. In the V-phase winding 8, the lead wire 3d of the first coil 3a on the outer peripheral side and the lead wire 4e of the third coil 4c on the inner peripheral side are short-circuited, and the short-circuited portion is connected to the power supply via the V-phase lead wire 16b. It is connected. In the W-phase winding 9, the lead wire 3d of the first coil 3a on the outer peripheral side and the lead wire 4e of the third coil 4c on the inner peripheral side are short-circuited, and the short-circuited portion is connected to the power supply via the W-phase lead wire 16c. It is connected. In the second embodiment, the outlet wire 3d of the outer peripheral side first coil 3a is the outlet wire at the start of winding of the outer peripheral side first coil 3a. The outlet wire 4e of the inner peripheral side third coil 4c is the outlet wire at the end of winding of the inner peripheral side third coil 4c.

As described above, each coil of the stator 20 according to the second embodiment has a three-phase Y connection structure by a two-parallel circuit. A three-phase Y connection by a two-parallel circuit may be described as a 2 // Y connection.

Here, as shown in FIG. 12, the number of slots is 18, and in the conventional concentric winding provided in the three-phase, six-pole stator, each of the windings of each phase is an odd number. It has three coils. Therefore, in the stator using such a conventional concentric winding, each coil has a Y connection structure in which each coil of the same phase is connected in series, or each coil of the same phase is connected in parallel. It has a three-phase Y connection structure with a three-parallel circuit. A three-phase Y connection by a three-parallel circuit may be described as a 3 // Y connection. That is, in the stator using such a conventional concentric winding, there are only two options for the connection structure of each coil.

On the other hand, the stator 20 according to the second embodiment includes six coils in which the windings of each phase are even numbers. Therefore, in the stator 20 according to the second embodiment, a 2 // Y connection structure can be adopted as described above in addition to the conventional connection structure of the stator using concentric windings. .. Therefore, the stator 20 configured as in the second embodiment has an effect that, in addition to the effect shown in the first embodiment, the choice of the connection structure of each coil is increased and the degree of freedom in design is increased. You can also get it.

Embodiment 3.
In the third embodiment, when a plurality of outer peripheral side coils 3 having the same phase are wound and formed, a plurality of outer peripheral side coils 3 are formed without cutting between the outer peripheral side coils 3, and the electric wires are used during the winding formation. A method of forming the crossover line 3f will be described. Similarly, in the third embodiment, when a plurality of inner peripheral side coils 4 having the same phase are wound and formed, a plurality of inner peripheral side coils 4 are formed without cutting between the inner peripheral side coils 4. A method of forming the crossover wire 4f by the electric wire at the time of winding and forming will be described. Further, in the third embodiment, a suitable arrangement of the outlet wires connected to the power supply in the outer peripheral side coil 3 and the inner peripheral side coil 4 will be described. In the third embodiment, items not particularly described are the same as those in the first or second embodiment, and the same reference numerals are used for the same functions and configurations as those in the first embodiment or the second embodiment. Will be described.

FIG. 16 is a perspective view for explaining an example of the stator according to the third embodiment of the present invention, and is a perspective view showing the stator core and a part of the winding.
In the third embodiment, the winding shown in FIG. 16 is a U-phase winding 7.
As shown in FIG. 16, the outer peripheral side first coil 3a and the outer peripheral side second coil 3b are connected by a crossover 3f. The outer peripheral side second coil 3b and the outer peripheral side third coil 3c are connected by a crossover wire 3f. When these crossover wires 3f are formed by winding the outer peripheral side first coil 3a, the outer peripheral side second coil 3b, and the outer peripheral side third coil 3c, the electric wires are not cut between the coils, and each coil is continuous. It is formed by forming in.

Similarly, the inner peripheral side first coil 4a and the inner peripheral side second coil 4b are connected by a crossover wire 4f. The inner peripheral side second coil 4b and the inner peripheral side third coil 4c are connected by a crossover wire 4f. When these crossover wires 4f are formed by winding the inner peripheral side first coil 4a, the inner peripheral side second coil 4b, and the inner peripheral side third coil 4c, the electric wire is not cut between the coils, and each coil is formed. Is formed by continuously forming.
Specifically, the outer peripheral side coil 3 and the inner peripheral side coil 4 are wound and formed as follows.

17 to 19 are perspective views for explaining a process of winding and forming a U-phase winding of a stator according to a third embodiment of the present invention.
The step of forming the winding of the V-phase winding 8 and the W-phase winding 9 is the same as the process of forming the winding of the U-phase winding 7.

As shown in FIG. 17, first, the electric wire is wound in a winding mold (not shown), leaving the electric wire portion to be the lead wire 4d, to form the inner peripheral side first coil 4a. Then, the inner peripheral side first coil 4a is inserted between the insertion blades 13. Next, the winding mold (not shown) is rotated around the plurality of insertion blades 13 arranged in an annular shape. Then, after forming the inner peripheral side first coil 4a, the electric wire is wound in a winding shape (not shown) without cutting the electric wire to form the inner peripheral side second coil 4b. Then, the inner peripheral side second coil 4b is inserted between the insertion blades 13. Next, the winding mold (not shown) is rotated around the plurality of insertion blades 13 arranged in an annular shape. Then, after forming the inner peripheral side second coil 4b, the electric wire is wound in a winding shape (not shown) without cutting the electric wire to form the inner peripheral side third coil 4c. Then, the inner peripheral side third coil 4c is inserted between the insertion blades 13. Finally, after inserting the inner peripheral side third coil 4c between the insertion blades 13, the electric wire is cut, leaving the electric wire portion serving as the lead wire 4e.

Subsequently, as shown in FIGS. 18 and 19, the outer peripheral side first coil 3a, the outer peripheral side second coil 3b, and the outer peripheral side third coil 3c are wound and formed, and these coils are formed between the insertion blades 13. insert. Specifically, the electric wire is wound in a winding mold (not shown) leaving the electric wire portion to be the lead wire 3d to form the first coil 3a on the outer peripheral side. Then, the outer peripheral side first coil 3a is inserted between the insertion blades 13. Next, the winding mold (not shown) is rotated around the plurality of insertion blades 13 arranged in an annular shape. Then, after the outer peripheral side first coil 3a is formed, the electric wire is wound in a winding shape (not shown) without cutting the electric wire to form the outer peripheral side second coil 3b. Then, the outer peripheral side second coil 3b is inserted between the insertion blades 13. Next, the winding mold (not shown) is rotated around the plurality of insertion blades 13 arranged in an annular shape. Then, after forming the outer peripheral side second coil 3b, the electric wire is wound in a winding shape (not shown) without cutting the electric wire to form the outer peripheral side third coil 3c. Then, the outer peripheral side third coil 3c is inserted between the insertion blades 13. Finally, after inserting the third coil 3c on the outer peripheral side between the insertion blades 13, the electric wire is cut, leaving the electric wire portion to be the lead wire 3e. As a result, the outer peripheral side coil 3 and the inner peripheral side coil 4 are arranged as shown in FIG.

In FIG. 18, after the winding formation of the outer peripheral side first coil 3a, the outer peripheral side second coil 3b, and the outer peripheral side third coil 3c is completed, these coils are not yet inserted between the insertion blades 13. It has become. FIG. 18 shows an image of the outer peripheral side first coil 3a, the outer peripheral side second coil 3b, and the outer peripheral side third coil 3c after the winding formation is completed. Actually, as described above, each of the outer peripheral side second coil 3b and the outer peripheral side third coil 3c is inserted between the insertion blades 13 after the winding formation of one coil is completed.

After arranging the outer peripheral side coil 3 and the inner peripheral side coil 4 as shown in FIG. 19, the outer peripheral side coil 3 and the inner peripheral side coil 4 are fixed by inserting the outer peripheral side coil 3 and the inner peripheral side coil 4 into the slot 1c as shown in the first embodiment. The child 20 is in the state shown in FIG. In FIG. 16, the outlet wire 3d of the outer peripheral coil 3 and the outlet wire 4e of the inner peripheral coil 4 are arranged in the same slot 1c.

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

FIG. 20 is a perspective view for explaining another example of the stator according to the third embodiment of the present invention, and is a perspective view showing the stator core and the U-phase winding.
In the stator 20 shown in FIG. 16, the outer peripheral side second coil 3b is arranged between the inner peripheral side first coil 4a and the inner peripheral side second coil 4b. On the other hand, in the stator 20 shown in FIG. 20, the outer peripheral side first coil 3a is arranged between the inner peripheral side first coil 4a and the inner peripheral side second coil 4b. Such an outer peripheral side coil 3 and an inner peripheral side coil 4 are formed by winding as follows.

21 and 22 are perspective views for explaining a process of winding and forming the U-phase winding of the stator shown in FIG. 20.
The step of forming the winding of the V-phase winding 8 and the W-phase winding 9 is the same as the process of forming the winding of the U-phase winding 7.

The winding formation 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 shown in FIGS. 17 to 17 except for the arrangement position of the outer peripheral side coil 3 with respect to the inner peripheral side coil 4. It is carried out in the same manner as the step shown in 19. Specifically, in the steps shown in FIGS. 17 to 19, the outer peripheral side second coil 3b was arranged between the inner peripheral side first coil 4a and the inner peripheral side second coil 4b. On the other hand, as shown in FIGS. 21 and 22, in the winding forming step of the outer peripheral side coil 3 in the U-phase winding 7 of the stator 20 shown in FIG. 20, the inner peripheral side first coil 4a and the inner peripheral side first coil 4a are formed. The outer peripheral side first coil 3a is arranged between the two coils 4b.

After arranging the outer peripheral side coil 3 and the inner peripheral side coil 4 as shown in FIG. 22, the outer peripheral side coil 3 and the inner peripheral side coil 4 are fixed by inserting the outer peripheral side coil 3 and the inner peripheral side coil 4 into the slot 1c as shown in the first embodiment. The child 20 is in the state shown in FIG. 120. In FIG. 20, the lead wire 3e of the outer peripheral coil 3 and the lead wire 4d of the inner peripheral coil 4 are arranged in the same slot 1c.

As in the stator 20 according to the third embodiment, the outlet wire of the outer peripheral side coil 3 and the outlet wire of the inner peripheral side coil 4 are arranged in the same slot 1c, so that the following The effect can be obtained.

In the stator 20 shown in FIG. 16, the outlet wire 3d of the outer peripheral side first coil 3a arranged in the same slot 1c as the outlet wire 4e of the inner peripheral side third coil 4c is the outer peripheral side first coil. Of the radial ends of the stator core 1 in 3a, it is arranged at the end 3g on the inner peripheral side third coil 4c side. Further, the outlet wire 4e of the inner peripheral side third coil 4c arranged in the same slot 1c as the outlet wire 3d of the outer peripheral side first coil 3a is the stator core 1 of the inner peripheral side third coil 4c. Of the radial ends, the end 4g on the outer peripheral side first coil 3a side is arranged.

When each coil of the stator 20 shown in FIG. 16 is connected as shown in FIG. 15, 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 connected. The connection work can be performed by regarding it as one outlet line. Therefore, it is possible to reduce the number of insulating parts used in the connection work between the lead wire 3d and the lead wire 4e and the connection portion between the lead wire 3d and the lead wire 4e. Therefore, when the coils of the stator 20 shown in FIG. 16 are connected 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 outlet wire 3e of the outer peripheral side third coil 3c arranged in the same slot 1c as the outlet wire 4d of the inner peripheral side first coil 4a is the outer peripheral side third coil. Of the radial ends of the stator core 1 in 3c, they are arranged at the end 3h on the side opposite to the inner peripheral side first coil 4a side. Further, the outlet wire 4d of the inner peripheral side first coil 4a arranged in the same slot 1c as the outlet wire 3e of the outer peripheral side third coil 3c is the stator core 1 of the inner peripheral side first coil 4a. Of the radial ends, the ends 4h on the side opposite to the outer peripheral side third coil 3c side are arranged.

FIG. 23 is a diagram showing an example of the connection structure of the stator shown in FIG.
When the current capacity of the motor is large, a plurality of coils constituting the same phase may be connected to the power supply by a plurality of lead wires. For example, each coil of the stator 20 shown in FIG. 20 may be connected as shown in FIG. 23. Specifically, the outlet wire 3e of the outer peripheral side third coil 3c and the outlet wire 4d of the inner peripheral side first coil 4a of the same phase may be connected to the power supply with different lead wires 16. In such a 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, so that the lead line 3e and the lead wire 4d are incorrect. It is possible to suppress the connection of the wire 16, and it becomes easy to connect the correct lead wire 16 to the lead wire 3e and the lead wire 4d.

Therefore, when the coils of the stator 20 shown in FIG. 20 are connected as shown in FIG. 23, the workability of assembling the stator 20 is improved, and the stator 20 can be manufactured at low cost. Further, when each coil of the stator 20 shown in FIG. 20 is connected as shown in FIG. 23, the reliability of the stator 20 can be improved. Here, when the outer peripheral side coil 3 and the inner peripheral side coil 4 are composed of electric wires having different diameters, different sizes of currents are supplied to the outer peripheral side coil 3 and the inner peripheral side coil 4. Therefore, it is easy to connect the correct lead wire 16 to the lead wire 3e and the lead wire 4d when the outer peripheral side coil 3 and the inner peripheral side coil 4 are composed of electric wires having different diameters. Especially useful for.

Embodiment 4.
In the fourth embodiment, an example of an electric motor using the stator 20 shown in any one of the first to third embodiments will be introduced. In the fourth embodiment, items not particularly described are the same as those of the first to third embodiments, and the same functions and configurations as those of the first to third embodiments are the same. It will be described using the code of.

FIG. 24 is a cross-sectional view showing an example of the electric motor according to the fourth embodiment of the present invention. FIG. 24 is a cross-sectional view of the motor 30 cut in a virtual plane parallel to the center of rotation of the rotor 31.
The electric motor 30 includes a stator 20 shown in any one of the first to third embodiments, and a rotor 31 rotatably arranged on the inner peripheral side of the stator 20. At the center of the rotor 31, a through hole 31a to which the output shaft is fixed is formed along the center of rotation of the rotor 31. The electric motor 30 is, for example, a synchronous electric motor in which the rotor 31 is provided with a permanent magnet. When a current is passed through the U-phase winding 7, the V-phase winding 8 and the W-phase winding 9 of the stator 20, a magnetic field is generated, and the magnetic field generates a rotational torque in the rotor 31. As a result, the rotor 31 rotates.

As described above, the electric motor 30 according to the fourth embodiment includes the stator 20 shown in any of the first to third embodiments. Therefore, the electric motor 30 can be made smaller and have higher performance, and the deterioration of reliability can be suppressed.

Embodiment 5.
In the fifth embodiment, an example of the compressor using the motor 30 shown in the fourth embodiment will be introduced. In the fifth embodiment, items not particularly described are the same as those of the first to fourth embodiments, and the same functions and configurations as those of the first to fourth embodiments are the same. It will be described using the code of.

FIG. 25 is a vertical cross-sectional view showing an example of the compressor according to the fifth embodiment of the present invention.
The compressor 40 includes the electric motor 30 shown in the fourth embodiment and the compression mechanism 41. The electric 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. Further, the compressor 40 includes a closed container 43. The electric motor 30, the compression mechanism 41, and the drive shaft 42 are housed in the closed container 43.

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

The compression mechanism 41 according to the fifth embodiment is a twin rotary type compression mechanism, but the type of the compression mechanism 41 is arbitrary. Various known compression mechanisms such as a single rotary 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 the fifth embodiment includes the electric motor 30 shown in the fourth embodiment. Therefore, the compressor 40 can be made smaller and have higher performance, and can suppress a decrease in reliability.

Further, as shown in FIG. 13, the stator 20 of the motor 30 has a small gap formed between the coil ends of the coils. Therefore, in the collection of coil ends of each coil, the wall on the inner diameter side has a cylindrical shape. Therefore, the flow of the refrigerant passing between the stator 20 and the rotor 31 becomes smooth. The performance of the compressor 40 according to the fifth embodiment is also improved by improving the flow of the refrigerant passing between the stator 20 and the rotor 31.

1 Fixture iron core, 1a back yoke, 1b teeth, 1c slot, 1d through hole, 2 slot film, 3 outer peripheral side coil, 3a outer peripheral side first coil, 3b outer peripheral side second coil, 3c outer peripheral side third coil, 3d Exit line, 3e Exit line, 3f crossover line, 3g end, 3h end, 4 inner circumference side coil, 4a inner circumference side first coil, 4b inner circumference side second coil, 4c inner circumference side third coil 4d outlet wire, 4e outlet wire, 4f crossover wire, 4g end, 4h end, 7U phase winding, 8V phase winding, 9W phase winding, 10 annular coil, 11 star coil , 12 coil, 13 insertion blade, 14 insertion stripper, 15a neutral point, 15b neutral point, 16 lead wire, 16a U phase lead wire, 16b V phase lead wire, 16c W phase lead wire, 20 stator, 30 electric motor , 31 rotator, 31a through hole, 40 compressor, 41 compression mechanism, 42 drive shaft, 43 closed container, 44 suction pipe, 45 discharge pipe.

Claims (8)

It has a hollow cylindrical shape, and has a stator core with multiple slots arranged on the inner circumference side at specified intervals in the circumferential direction.
Concentric windings with distributed windings wound through the slots,
With
The number of slots for each pole and each phase is 1,
The windings of the same phase have as many coils as there are poles.
Half of these coils are outer peripheral coils and are located on the outer peripheral side of the inner peripheral coil, which is the other half of these coils.
The outer peripheral coil and the inner coil are alternately arranged in the circumferential direction.
When observing the adjacent outer peripheral side coil and the inner peripheral side coil, a part of the outer peripheral side coil and a part of the inner peripheral side coil are housed in the same slot.
The coil ends of the coils constituting the windings of the same layer are stators arranged in an annular shape. The stator according to claim 1, wherein the outer peripheral coil and the inner coil have the same number of turns and the same resistance value. The winding of the same phase includes a plurality of the outer peripheral side coils and a plurality of the inner peripheral side coils.
Each of the outer peripheral side coils is connected to the adjacent outer peripheral side coil by a crossover.
The stator according to claim 1 or 2, wherein each of the inner peripheral side coils is connected to the adjacent inner peripheral side coil by a crossover. The outer peripheral coil and the inner coil are provided with a lead wire.
The stator according to any one of claims 1 to 3, wherein the outlet wire of the outer peripheral coil and the outlet wire of the inner peripheral coil are arranged in the same slot. The outlet wire of the outer peripheral side coil is arranged at the end portion on the inner peripheral side coil side of the radial end portions of the stator core in the outer peripheral side coil.
The stator according to claim 4, wherein the outlet wire of the inner peripheral coil is arranged at the end of the inner coil on the outer peripheral side coil side among the radial ends. The outlet wire of the outer peripheral side coil is arranged at the end portion of the outer peripheral side coil in the radial direction of the stator core, which is opposite to the end portion on the inner peripheral side coil side. ,
4. The outlet wire of the inner peripheral side coil is arranged at the end portion of the inner peripheral side coil in the radial direction opposite to the end portion on the outer peripheral side coil side. Stator described in. The stator according to any one of claims 1 to 6 and the stator.
A rotor arranged on the inner peripheral side of the stator and
Motor equipped with. The motor according to claim 7 and
A compression mechanism that compresses the refrigerant by the driving force of the motor,
Compressor equipped with.

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