CN117083780A

CN117083780A - Stator of motor, compressor and refrigeration cycle device

Info

Publication number: CN117083780A
Application number: CN202180096701.8A
Authority: CN
Inventors: 山城幸宏; 荒井利夫
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2021-04-07
Filing date: 2021-04-07
Publication date: 2023-11-17
Also published as: JPWO2022215189A1; WO2022215189A1; CZ2023370A3

Abstract

A stator of an electric motor, a compressor, and a refrigeration cycle device are provided with: a stator core formed by connecting a plurality of split cores in a circular ring shape, wherein the split cores are provided with a circular arc-shaped back yoke and teeth extending from the circumferential center to the central shaft side in the inner surface of the back yoke; a coil wound around the teeth of the split core; and an insulating member that insulates the split core and the coil, wherein a slot in which the coil is arranged is formed between two adjacent teeth in the stator core, the insulating member having a continuous slot insulating member that is arranged in the slot and covers a surface of an inner peripheral wall of the slot in the stator core, the slot insulating member including a connection coating portion that coats a connection portion that connects the two back yokes in the inner peripheral wall of the slot, wherein a protrusion protruding toward the center axis side is formed only in a central portion in the axial direction or a protrusion protruding toward the outside in the radial direction is formed only at end portions on both sides in the axial direction in the connection coating portion.

Description

Stator of motor, compressor and refrigeration cycle device

Technical Field

The present disclosure relates to a stator of an electric motor, a compressor, and a refrigeration cycle device, and more particularly, to a structure of a stator of an electric motor.

Background

In general, a stator of an electric motor used for a compressor or the like includes a stator core, a coil, and an insulating member that insulates the stator core and the coil. The stator core has a cylindrical back yoke and a plurality of teeth extending from the back yoke toward the center axis side, and the coil is wound around each tooth via an insulating member, and the coil is disposed in a slot formed between adjacent teeth. In a stator of an electric motor, in order to improve the performance of the motor, it is desired to improve the space factor (winding density) of a coil. For this purpose, the following techniques exist: the stator core is constituted by a plurality of arcuate split cores, so that the dead space of the slot is minimized, and the slot is expanded by arranging the plurality of split cores in a straight-line-shaped expanded state during winding, thereby facilitating winding (for example, refer to patent document 1). In patent document 1, in the expanded state of the stator core, the back yokes of adjacent divided cores are connected to each other on the outer peripheral side of their circumferential ends, and a V-shaped gap is formed on the inner peripheral side of the connecting portion. When the plurality of split cores are deformed into a ring shape after winding, the gap on the inner peripheral side of the connecting portion is closed. The stator of the motor of patent document 1 has a bobbin of a coil end portion formed of an insulating resin material and a slot insulating member as insulating members. The slot insulating member is provided with a bent portion for easily obtaining insulation between the stator core and the coil at a portion (hereinafter referred to as a connection coating portion) facing the connection portion of the back yoke. In addition, in order to secure a wider winding area, a sheet-like insulating material is used as the slot insulating member. In the stator of patent document 1, when the plurality of split cores are deformed into a ring shape, the bent portion is formed in a mountain-like shape on the inner side, that is, on the center axis side, in order to prevent the slot insulating member from being sandwiched between the back yokes of the adjacent split cores. The bending portion is formed from one end to the other end in the axial direction at a connection coating portion covering the connection portion of the back yoke.

Patent document 1: japanese patent laid-open No. 9-191588

As shown in patent document 1, when winding wire around teeth, the wire winding nozzle passes through the grooves between the teeth, above the teeth, and below the teeth. Therefore, in the structure in which the bent portion is formed from one end to the other end in the axial direction of the connection coating portion as in the slot insulating member of patent document 1, the bent portion of the connection coating portion may be wound with the wire when the wire winding nozzle performs the direction conversion at the end portion of the tooth during the wire winding. When the slot insulating member winds the wire, the arrangement of the wire is broken, and the space factor (wire density) of the coil in the slot is reduced.

In order to avoid the entanglement of the slot insulating member, if the connecting coating portion of the slot insulating member is formed in a straight shape without providing a bent portion, the structure for maintaining the shape of the connecting coating portion in the expanded state of the stator core is lost, and the shape of the connecting coating portion is unstable. Therefore, even in this case, the slot insulating member may be involved, the arrangement of the windings may be broken, and the space factor of the coil in the slot may be reduced.

Disclosure of Invention

The present disclosure has been made to solve the above-described problems, and an object thereof is to provide a stator of a motor, a compressor, and a refrigeration cycle device, in which a reduction in space factor of a coil due to an arrangement failure of windings is suppressed.

The stator of the motor according to the present disclosure includes: a stator core formed by connecting a plurality of split cores in a circular ring shape, wherein the split cores are provided with a circular arc-shaped back yoke and teeth extending from the circumferential center to the central shaft side in the inner surface of the back yoke; a coil wound around the teeth of the split core; and an insulating member that insulates the split cores and the coils, wherein a slot in which the coils are arranged is formed between two adjacent teeth in the stator core, the insulating member having a continuous slot insulating member that is arranged in the slot and covers a surface of an inner peripheral wall of the slot in the stator core, the slot insulating member including a connection coating portion that covers a connection portion that connects the two back yokes in the inner peripheral wall of the slot, and a protrusion that protrudes toward the center axis side is formed only in a central portion in an axial direction or a protrusion that protrudes toward an outer side in a radial direction is formed only in end portions on both sides in the axial direction.

Further, the compressor according to the present disclosure includes: a motor having a stator of the motor and a rotor provided rotatably with respect to the stator of the motor; and a compression element driven by the motor and compressing the refrigerant.

The refrigeration cycle device according to the present disclosure includes a refrigerant circuit configured by connecting the above-described compressor, the 1 st heat exchanger, the pressure reducing device, and the 2 nd heat exchanger with refrigerant pipes.

According to the present disclosure, the connecting coating portion of the slot insulating member is formed with a protrusion protruding toward the center axis side only in the center portion in the axial direction, or with a protrusion protruding toward the outer side in the radial direction only at the end portions on both sides in the axial direction. In either case, since any of the protruding portions is formed in the connection coating portion of the slot insulating member, the shape of the connection coating portion is stable. In either case, the end portions of the connecting coating portion of the slot insulating member on both axial sides do not have a structure protruding into the slot. Therefore, the winding of the slot insulating member during winding is suppressed, and therefore, a stator of a motor, a compressor, and a refrigeration cycle device in which a reduction in the space factor of the coil due to the arrangement failure of the winding is suppressed can be provided.

Drawings

Fig. 1 is a perspective view showing a structure of a stator of an electric motor according to embodiment 1.

Fig. 2 is a plan view showing the structure of the stator of fig. 1.

Fig. 3 is a perspective view of the split core in the stator of fig. 1, as seen from the inside.

Fig. 4 is a perspective view of the split core in the stator of fig. 1, as seen from the outside.

Fig. 5 is a partial cross-sectional view of the stator of fig. 1.

Fig. 6 is a perspective view of the split stator of the stator of fig. 1, as seen from the inside.

Fig. 7 is an explanatory view showing an expanded state of the stator of fig. 5 before winding.

Fig. 8 is a perspective view of the stator of fig. 1 from the inside in an expanded state before winding of the adjacent split cores to which the insulating member is attached.

Fig. 9 is a perspective view of one of the adjacent split cores 10 of fig. 8, as seen from the outside.

Fig. 10 is a partial structure view of the stator of fig. 1, as seen from the outside, in an expanded state before winding.

Fig. 11 is a sectional view showing a section A-A of the stator of fig. 10.

Fig. 12 is a sectional view showing a section B-B of the stator of fig. 10.

Fig. 13 is a sectional view from above of the split stator of fig. 6.

Fig. 14 is a perspective view showing a positional relationship between the stator and the winding nozzle at the time of winding the stator of fig. 1.

Fig. 15 is a partial structure view of the stator and the winding nozzle of fig. 14, as viewed from the lower side of the split stator.

Fig. 16 is a longitudinal sectional view showing a compressor provided with the stator of fig. 1.

Fig. 17 is a refrigerant circuit diagram showing a refrigeration cycle apparatus including the compressor of fig. 16.

Fig. 18 is a partial structure view of the stator according to embodiment 2, as viewed from the tooth side to the outside in the developed state before winding.

Fig. 19 is a sectional view showing a C-C section of the stator of fig. 18.

Fig. 20 is a sectional view showing a D-D section of the stator of fig. 18.

Detailed Description

Embodiments of the present disclosure will be described below with reference to the drawings. In the drawings, the same or corresponding portions are denoted by the same reference numerals, and description thereof is omitted or simplified as appropriate. The configuration described in each drawing may be changed in shape, size, arrangement, and the like as appropriate.

Embodiment 1

(stator)

Fig. 1 is a perspective view showing a structure of a stator of an electric motor according to embodiment 1. Fig. 2 is a plan view showing the structure of the stator of fig. 1. As shown in fig. 1, the stator 34 has a cylindrical shape. As shown in fig. 2, the stator 34 is composed of a plurality of divided stators 50 arranged in an annular shape in a plan view. Although described below, the stator 34 constitutes the motor 100 together with a rotor provided rotatably with respect to the stator 34 (fig. 16). The central axis O of the stator 34 is shown in fig. 1. Hereinafter, the structure of the stator 34 will be described with the axial direction of the center axis O (arrow Z direction) as the up-down direction of the stator 34.

(split stator 50)

In the example shown in fig. 1, the stator 34 is formed by connecting nine divided stators 50 in an annular shape. As shown in fig. 1, the split stator 50 includes a split core 10, an insulating member 8 provided to the split core 10, and a coil 5 formed of a wire wound around the split core 10.

(split core 10)

Fig. 3 is a perspective view of the split core in the stator of fig. 1, as seen from the inside. Fig. 4 is a perspective view of the split core in the stator of fig. 1, as seen from the outside. As shown in fig. 3, the split core 10 has a plurality of core segments 1. The core sheet 1 is formed of a plate-like member having magnetic properties, and is formed by punching out an electromagnetic steel plate as a soft magnetic material using a die, for example. The plurality of core pieces 1 are stacked in the up-down direction (arrow Z direction) and integrated by caulking or the like, thereby forming a block-shaped split core 10 having a thickness in the up-down direction (arrow Z direction). In the following description, the plurality of split cores 10 in the stator 34 may be collectively referred to as a stator core.

The split core 10 includes an arc-shaped back yoke 10a constituting the outer peripheral portion of the stator 34, teeth 10b extending from the inner surface 10ai of the back yoke 10a toward the center axis O (fig. 1), and shoes 10c provided on both circumferential sides of the distal end portions 10b1 of the teeth 10 b. The back yoke 10a has an outer peripheral surface 10ao which is circular-arc-shaped in a plan view as shown in fig. 4, an inner surface 10ai which is linear in a plan view as shown in fig. 3, and two side surfaces 10as connecting the outer peripheral surface 10ao (fig. 4) and the inner surface 10ai at both ends in the circumferential direction. The divided cores 10 are connected to adjacent divided cores 10 at both ends in the circumferential direction of the back yoke 10 a.

Fig. 5 is a partial cross-sectional view of the stator 34 of fig. 1. As shown in fig. 5, in the adjacent split stator 50, the outer peripheral surface 10ao side of the side surface 10as of the back yoke 10a is connected. Hereinafter, the portions connected to each other in the back yokes 10a of the adjacent split cores 10 are sometimes referred to as connecting portions.

The teeth 10b extend from the circumferential center in the inner surface 10ai of the back yoke 10a toward the center axis O side. In the example shown in fig. 3, the teeth 10b have a constant thickness in the circumferential direction on the back yoke 10a side and the center axis O (fig. 1) side, and the inner surface 10ai of the back yoke 10a is connected at right angles to the side surfaces 10bs of the teeth 10 b. In the present embodiment, the inner surface 10ai of the back yoke 10a and the side surface 10bs of the tooth 10b are connected at right angles, but may be other than at right angles.

As shown in fig. 3, the boot 10c has an inner surface 10ci on the center axis O side and an outer surface 10co (fig. 4) on the back yoke 10a side, and has a tapered end shape. The inner surface 10ci of the shoe 10c is smoothly connected with the inner surface 10bi of the tooth 10b to form the inner surface 10i of the split core 10. The inner surface 10i of the split core 10 has an arc shape.

As shown in fig. 2, in a state where the plurality of split stators 50 are arranged in a ring shape, both side surfaces 10as of the back yoke 10a of the split core 10 shown in fig. 4 are in contact with the side surfaces 10as of the back yoke 10a of the other two adjacent split cores 10. Hereinafter, a state in which the plurality of divided stators 50 are arranged in a ring shape may be referred to as a stator core closed state.

As shown in fig. 2, slots 6 are formed between adjacent split cores 10 in the stator 34, and coils 5 wound around teeth 10b (fig. 4) are arranged in the slots 6 via insulating members 8. That is, the slot 6 is a space surrounded by the side surfaces 10bs of the teeth 10b facing each other in the adjacent divided cores 10, the outer surfaces 10co of the shoes 10c facing each other, and the inner surfaces 10ai of the adjacent back yokes 10 a. Hereinafter, these surfaces on which the slots 6 are formed in the adjacent split cores 10 are sometimes referred to as slot inner peripheral walls.

(coil 5)

Fig. 6 is a perspective view of the split stator 50 in the stator of fig. 1, as seen from the inside. As shown in fig. 6, the coil 5 is a wire composed of a core wire as a conductor and an insulating coating member covering the core wire. The core wire is made of, for example, copper, aluminum, or an alloy having conductivity. The lead wires constituting the coil 5 are wound around the teeth 10b of the split core 10a plurality of times via the insulating member 8, and the coil 5 has a ring shape long in the up-down direction (arrow Z direction). The coil 5 forms a magnetic pole by winding a wire around the teeth 10 b. Therefore, when a current flows through the wire of the coil, a magnetic flux is generated in each tooth 10 b. The winding wire wound around the teeth 10b (fig. 3) a plurality of times between the back yoke 10a and the shoe 10c is provided with a plurality of layers at the upper end portion of the split stator 50, each layer including a plurality of winding wires arranged in a row.

(insulating part 8)

Fig. 7 is an explanatory diagram showing an expanded state of the stator 34 of fig. 5 before winding. As shown in fig. 7, in the stage of manufacturing the stator 34, winding is performed in a state where the plurality of split cores 10 are arranged in a straight line. Hereinafter, a state in which the plurality of divided cores 10 are arranged in a straight line may be referred to as an expanded state. In the expanded state, V-shaped gaps 10g are formed on the inner surface 10ai side of the side surfaces 10as of the back yoke 10a in the adjacent split cores 10 connected by the connecting portions 10 r.

Fig. 8 is a perspective view from the inside of an expanded state before winding of the adjacent split cores 10 after the insulating member 8 is attached to the stator of fig. 1. Fig. 9 is a perspective view of one of the adjacent split cores 10 of fig. 8, as seen from the outside. As shown in fig. 8, the insulating member 8 insulates the split iron core 10 made of iron or the like and the coil 5 made of copper or the like. The insulating member 8 includes a pair of end surface insulating members 4 attached to the end surfaces of the split cores 10 on both sides in the axial direction (arrow Z direction), and continuous slot insulating members 7 disposed in the slots 6 of the stator core and covering the surfaces of the inner peripheral walls of the slots.

Fig. 10 is a partial structure view of the stator of fig. 1, as seen from the tooth side to the outside in an expanded state before winding. Fig. 11 is a sectional view showing a section A-A of the stator of fig. 10. Fig. 12 is a sectional view showing a section B-B of the stator of fig. 10. The structure of the slot insulating member 7 and the pair of end surface insulating members 4 will be described below with reference to fig. 7 to 12.

(groove insulation Member 7)

As shown in fig. 7, slot insulating members 7 are provided in the respective slots 6 of the stator 34. The slot insulating member 7 secures an insulating distance of a thickness between the coil 5 and the slot inner peripheral wall of the adjacent split core 10, and insulates each other.

As shown in fig. 8, the slot insulating member 7 disposed in each slot 6 is composed of 1 sheet-like insulating material. The slot insulating member 7 may be made of, for example, a PET (polyethylene terephthalate) sheet.

As shown in fig. 7, the slot insulating member 7 seamlessly covers the slot inner peripheral wall of the adjacent split core 10 constituting the slot 6, and the connecting portion 10r of the adjacent split core 10 is also covered by the slot insulating member 7. The slot insulating member 7 includes: a back yoke coating portion 7a for coating the adjacent back yoke 10a in the inner peripheral wall of the groove; two tooth coating portions 7b for coating the two teeth 10b; and two boot wrapping portions 7c wrapping the two boots 10c. Hereinafter, a region of the back yoke coating portion 7a that coats the connecting portion 10r of the adjacent back yoke 10a in the circumferential center is referred to as a connecting coating portion 70 (see fig. 10).

As shown in fig. 8, in the developed state in which the adjacent back yokes 10a are arranged in a straight line, the upper end portion 7a1 and the lower end portion 7a2 of the back yoke cover 7a are arranged along the inner surface 10ai of the back yoke 10a by a set of end surface insulating members 4. However, the structure of the connecting coating portion 70 for directly holding the slot insulating member 7 is not provided in the one set of end surface insulating members 4.

As shown in fig. 12, a protruding portion 71 extending in the axial direction (arrow Z direction) and having a mountain shape on the central axis O side is formed in the coupling coating portion 70 covering the coupling portion 10r in the back yoke coating portion 7a of the slot insulating member 7. As shown in fig. 10, a protrusion 71 having a constant length in the axial direction (arrow Z direction) is formed in the connection coating portion 70 of each slot insulating member 7. The protruding portion 71 having a mountain shape on the center axis O side is formed only in the central portion 70c in the axial direction (arrow Z direction) of the coupling cover 70 of the back yoke cover 7a, and is not formed in the upper end portion 70a and the lower end portion 70b of the coupling cover 70. As shown in fig. 11, in the expanded state of the stator core, the upper end portion 70a and the lower end portion 70b of the coupling cover portion 70, that is, the end portions on both sides in the axial direction (arrow Z direction) of the coupling cover portion 70, have a substantially planar shape along the inner surface 10ai of the back yoke 10 a.

In this way, the shape of the connecting coating portion 70 is stabilized by forming the protruding portion 71 at the axial center portion 70c of the connecting coating portion 70, and a structure protruding into the groove 6 is not provided at the end portion of the connecting coating portion 70. This suppresses the winding of the slot insulating member during winding, and therefore, the arrangement of the winding wires can be suppressed from being damaged.

In the example shown in fig. 11, the end portions on both axial sides of the connecting coating portion 70 are formed in a substantially planar shape, but another protruding portion may be formed on the end portion of the connecting coating portion 70 so as to be mountain-shaped in the radial direction. As shown in fig. 1, in the state where the stator core is closed, the pair of end surface insulating members 4 of the adjacent split stator 50 are separated from each other at the outer peripheral side of the back yoke coating portion 7 a. Therefore, even when the end of the connection coating portion 70 is formed with another protruding portion having a mountain shape on the radially outer side, the deformation of the stator core is not hindered when the stator core is deformed into a ring shape after winding.

(a set of end insulating parts 4)

As shown in fig. 8, a set of end surface insulating members 4 is provided to each of the split cores 10. The group of end surface insulating members 4 is constituted by an upper end surface insulating member 2 attached to the upper end surface of the split core 10 and a lower end surface insulating member 3 attached to the lower end surface of the split core 10. The upper end surface insulating member 2 secures an insulating distance of a thickness amount between the coil 5 and the upper end surface of the split core 10, and insulates each other. The lower end surface insulating member 3 secures an insulating distance of a thickness between the coil 5 and the lower end surface of the split core 10, and insulates the coil and the split core from each other. The group of end surface insulating members 4 attached to the split cores 10 also function as bobbins for the coils 5.

(Upper terminal insulating part 2)

The upper end surface insulating member 2 includes an outer flange 2a, an inner flange 2b provided radially inward of the outer flange 2a, and a tooth end surface coating portion 2c provided between the outer flange 2a and the inner flange 2b. The upper end surface insulating member 2 further includes: a step portion 2d connecting the tooth end face coating portion 2c and the outer flange 2a; and a bevel portion 2e (fig. 9) connecting the tooth end face coating portion 2c and the inner flange 2b. The outer flange 2a and the inner flange 2b restrict the arrangement of the upper layer winding among the multi-layer windings constituting the coil 5. In addition, the stepped portion 2d and the inclined surface portion 2e (fig. 9) restrict the arrangement of the lower layer winding among the multi-layer windings constituting the coil 5.

The outer flange 2a has a cubic shape, and the lower surface of the outer flange 2a is in contact with the central axis O side of the upper surface of the back yoke 10 a. The outer flange 2a is disposed over the back yoke 10a in such a manner that the inner surface of the outer flange 2a is coplanar with the inner surface 10ai (fig. 3) of the back yoke 10 a. A part of the back yoke coating portion 7a of the slot insulating member 7, specifically, an upper end portion 7a1 of the back yoke coating portion 7a is arranged along lower portions of both circumferential sides in the inner surface of the outer flange 2 a. The circumferential width of the outer flange 2a is shorter than the circumferential width of the back yoke 10a, and the outer flanges 2a of the adjacent split stators 50 are separated from each other.

The inner flange 2b has an inner surface 2bi on the central axis O side and has a substantially rectangular parallelepiped shape having an arc shape. The inner surface 2bi of the inner flange 2b is formed in an arc shape having substantially the same curvature as the inner surface 10i of the split core 10, and the inner flange 2b is disposed on the shoe 10c such that the inner surface 2bi of the inner flange 2b is coplanar with the inner surface 10i of the split core 10. A slit 2b1 is formed in the lower portion of the inner flange 2b on both sides in the circumferential direction. Each slit 2b1 is formed from the inclined surface portion 2e to the side surface of the inner flange 2b in the circumferential direction, and both circumferential sides of each slit 2b1 are open. A part of the boot cover 7c of the slot insulating member 7 is disposed in the slit 2b1. Specifically, the upper end portion of the boot cover 7c is inserted into the slit 2b1 from below, and the position of the upper end portion of the boot cover 7c is regulated.

The tooth end surface coating portion 2c is connected to the lower portion of the outer flange 2a and the lower portion of the inner flange 2 b. The tooth end surface coating portion 2c is formed of, for example, a plate-like member bent in a U shape, and end portions 2c1 on both circumferential sides of the tooth end surface coating portion 2c extend downward. The tooth end surface coating portion 2c covers the upper surface of the tooth 10b and the upper end portions of both side surfaces 10bs (fig. 4) of the tooth 10 b.

The stepped portion 2d is configured to be a rising step from the tooth end surface coating portion 2c toward the outer flange 2 a. That is, the outer diameter increases as the step portion 2d is located closer to the outer flange 2 a. The stepped portion 2d has a substantially U-shape so as to extend along the tooth end surface coating portion 2c, and end portions 2d1 on both circumferential sides of the stepped portion 2d extend downward.

A gap is formed between the end 2d1 of the step 2d and the inner surface of the outer flange 2a, and a portion on the tooth coating portion 7b side of the upper end 7a1 of the back yoke coating portion 7a is disposed in the gap and pressed against the back yoke 10a side of the split core 10. A gap is formed between the end 2d1 of the step 2d and the end 2c1 of the tooth end surface coating portion 2c, and a portion on the back yoke coating portion 7a side of the upper end of the tooth coating portion 7b is disposed in the gap and pressed against the tooth 10b side of the split core 10. In other words, the end 2d1 of the step 2d presses the boundary between the tooth coating portion 7b and the back yoke coating portion 7a of the slot insulating member 7 toward the split core 10. Hereinafter, the end 2d1 of the step 2d may be referred to as a pressing portion.

As shown in fig. 9, the inclined surface portion 2e has a shape inclined so that the outer diameter becomes larger from the tooth end surface coating portion 2c toward the inner flange 2 b. The inclined surface portion 2e has a substantially U-shape so as to extend along the tooth end surface coating portion 2c, and end portions 2e1 on both circumferential sides of the inclined surface portion 2e extend downward. However, in the example shown in fig. 9, the end portion 2e1 extending downward in the inclined surface portion 2e is not provided at a height position where the slit 2b1 is formed so as not to obstruct the insertion of the boot wrapping portion 7c into the slit 2b1 formed in the lower portion of the inner flange 2 b.

(lower end insulating part 3)

As shown in fig. 8, the lower end surface insulating member 3 has substantially the same structure as the case of vertically symmetrical upper end surface insulating member 2, and has an outer flange 3a, an inner flange 3b, a tooth end surface coating portion 3c, a step portion (not shown), and a slope portion 3e (fig. 9) as in the upper end surface insulating member 2. Further, a slit 3b1 is formed in the inner flange 3b of the lower end surface insulating member 3. However, unlike the case of the outer flange 2a of the upper end surface insulating member 2, a wiring groove 3f is formed in the outer flange 3a of the lower end surface insulating member 3. The wiring groove 3f is provided with a terminal portion of a wire constituting the coil 5.

Fig. 13 is a sectional view from above of the split stator 50 of fig. 6. In fig. 13, the winding order of the plurality of windings constituting the coil 5 is shown. Fig. 14 is a perspective view showing a positional relationship between the stator 34 and the winding nozzle 20 at the time of winding the stator 34 of fig. 1. Fig. 15 is a partial structure view of the stator 34 and the winding nozzle 20 of fig. 14, as viewed from the lower side of the split stator 50. The winding process at the time of manufacturing the stator 34 will be described with reference to fig. 13 to 15.

As shown in fig. 14, the winding process is performed in a state where the slot insulating members 7 are mounted in the slots Zhou Bian and a set of end surface insulating members 4 are mounted on the end surfaces of the split cores 10 on both axial sides. In the winding step, the coil 5 is wound in a state where the plurality of split cores 10 are linearly spread. Specifically, in the winding process, the plurality of split cores 10 to which the insulating member 8 is attached are held by members such as the jigs 21 such that the back yokes 10a thereof are arranged in a straight line. The plurality of winding nozzles 20 are provided at a constant interval, and the coil 5 is wound around the plurality of teeth 10b with the plurality of divided cores 10 held by the jigs 21. By moving the plurality of winding nozzles 20 with respect to the jig 21 in a state of maintaining a constant interval, the wire 5a from each winding nozzle 20 is wound around the tooth 10b corresponding to the winding nozzle 20. At this time, the winding nozzle 20 passes through, above, and below the slots 6 on both sides of the corresponding split core 10.

In the example shown in fig. 13, winding is performed from the step portion 2d side of the upper end surface insulating member 2 on the upper end surface of the split core 10. The first winding is performed at a position in contact with the inner surface of the first step in the step portion 2D of the upper end surface insulating member 2, and the first layer of wire is wound in the tooth end surface coating portion 2c in the direction of arrow D1 from the step portion 2D side toward the inner flange 2 b. After the first layer is wound a predetermined number of times, the second layer of wires is wound in sequence in the direction of arrow D2 toward the outer flange 2 a. The second layer wires are stacked in a staggered positional relationship in such a manner as to be in contact with the adjacent wires in the first layer. After that, the third layer and later layers are similarly wound so as to have a positional relationship in which the wires of the immediately lower layers are alternately stacked. When the winding is completed a predetermined number of times, the terminal end portion of the lead wire 5a is placed in the wiring groove 3f formed in the outer flange 3a of the lower end surface insulating member 3.

In the coil 5, for example, the windings of the lower layers such as the first layer and the second layer are arranged between the step portion 2d and the inclined surface portion 2e in the upper end surface insulating member 2, and the positions in the radial direction are regulated by the step portion 2d and the inclined surface portion 2 e. Specifically, the winding on the outermost flange 2a side of each layer of the lower layer portion is in contact with the inner surface of the step portion 2d, and the winding on the innermost flange 2b side of each layer of the lower layer portion is in contact with the inclined surface portion 2 e. The winding on the outermost flange 2a side of the first layer of windings is in contact with the inner surface of the first step of the step portion 2d, and the winding on the outermost flange 2a side of the second layer of windings is in contact with the inner surface of the second segment formed higher than the first step and on the outer flange 2a side in the step portion 2 d. With this configuration, the windings of the lower layer portion of the coil 5 can be prevented from being separated in the radial direction, and the windings of the lower layer portion of the coil 5 and the windings of the upper layer portion (for example, the third layer or more) can be arranged in an aligned manner.

As shown in fig. 15, since the stator 34 is constituted by a plurality of divided stators 50 divided for each tooth 10b, the width between the teeth 10b is enlarged in the expanded state at the time of winding as compared with when the stator core is closed. Thereby, the width of the winding nozzle 20 can be further increased to wind thicker wires.

As described above, the connecting coating portion 70 of the slot insulating member 7 has no structure protruding into the slot 6 at the end portions of the connecting coating portion 70 on both sides in the axial direction, and is formed in a stable shape by the protruding portion 71. Therefore, the winding of the slot insulating member 7 is suppressed, and the arrangement of the windings is ensured.

As shown in fig. 15, the back yoke coating portion 7a of the slot insulating member 7 is formed in a shape along the inner surface 10ai of the back yoke 10a during winding. Therefore, the connection coating portion 70 is located radially outward of the track of the wire 5a during winding, and therefore the winding-up of the slot insulating member 7 is further suppressed.

As described above, the stator 34 of the motor according to embodiment 1 includes the stator core composed of the plurality of split cores 10 connected in an annular shape, the coil 5, and the insulating member 8 insulating the split cores 10 and the coil 5. Each of the split cores 10 has an arcuate back yoke 10a and teeth 10b extending from the circumferential center of the inner surface 10ai of the back yoke 10a toward the center axis O, and the coil 5 is wound around the teeth 10b of each of the split cores 10. Slots 6 in which coils 5 are arranged are formed between two adjacent teeth 10b in the stator core. The insulating member 8 has a continuous slot insulating member 7 covering the surface of the slot inner peripheral wall in the stator core. The slot insulating member 7 includes a connection coating portion 70, and the connection coating portion 70 coats a connection portion 10r connecting the two back yokes 10a in the slot inner peripheral wall, and a protrusion 71 protruding toward the center axis O side is formed only in a central portion 70c in the axial direction (arrow Z direction) of the connection coating portion 70.

As a result, the shape of the connection coating portion 70 of the slot insulating member 7 is stabilized by the protruding portion 71 provided at the central portion 70c in the axial direction (arrow Z direction), and the connection coating portion 70 is structured such that no protruding portion exists at both end portions in the axial direction. Therefore, the winding of the connection coating portion 70 of the slot insulating member 7 at the time of switching the direction of the end portion of the tooth 10b by the winding nozzle 20 at the time of winding is suppressed, and the winding alignment can be ensured. Thereby, the stator 34 of the motor in which the reduction of the space factor of the coil 5 due to the breakage of the arrangement of the windings is suppressed can be provided.

The insulating member 8 has a pair of end surface insulating members 4 attached to end surfaces on both sides in the axial direction (arrow Z direction) of the split core 10. This makes it possible to insulate the upper end surface and the lower end surface of the split core 10 from the coil 5 and to limit the vertical position of the slot insulating member 7.

In addition, the stator core has shoes 10c protruding from both ends in the circumferential direction in the tip end portions 10b1 of the teeth 10 b. The slot insulating member 7 includes a boot covering portion 7c, and the boot covering portion 7c covers the boot 10c in the slot inner peripheral wall. Slits (slits 2b1 and slits 3b 1) are formed in the pair of end-face insulating members 4, and the slits fix the end portions on both sides in the axial direction in the boot covering portion 7 c.

This makes it possible to suppress the loosening of the shoe coating portion 7c of the slot insulating member 7 along the shoe 10c of the split core 10, and to suppress the winding-up of the shoe coating portion 7c during winding. Therefore, the arrangement failure of the winding wires can be more reliably suppressed.

In addition, the slot insulating member 7 includes: a back yoke coating portion 7a coating the back yoke 10a in the inner peripheral wall of the groove; and a tooth coating portion 7b coating the teeth 10b in the inner peripheral wall of the groove. A pressing portion (an end 2d1 of the step 2 d) that presses the boundary portion between the tooth coating portion 7b and the back yoke coating portion 7a in the slot insulating member 7 toward the split core 10 is formed in one end insulating member (the upper end insulating member 2) of the pair of end insulating members 4.

This makes it possible to maintain the shape of the slot insulating member 7 so that the tooth coating portions 7b and the back yoke coating portions 7a follow the split cores 10, and to suppress the winding of the tooth coating portions 7b and the back yoke coating portions 7a during winding. Therefore, the arrangement failure of the winding wires can be more reliably suppressed.

< Rotary compressor >)

Fig. 16 is a longitudinal sectional view showing a compressor provided with the stator of fig. 1. Hereinafter, a rotary compressor 300 to which the stator 34 described above is applied will be described with reference to fig. 16. The rotary compressor 300 is used for an air conditioner, for example, and includes a closed container 307, a compression element 301 disposed in the closed container 307, and a motor 100 for driving the compression element 301. The motor 100 is configured by the stator 34 and the rotor 33 provided rotatably with respect to the stator 34.

The compression element 301 compresses the refrigerant. The compression element 301 has: a cylinder block 302 having a cylinder chamber 303; a shaft 37 rotated by the motor 100; and a rotary piston 304 fitted to the shaft 37. The compression element 301 further has: a vane (not shown) dividing the cylinder chamber 303 into a suction side of the refrigerant and a compression side of the refrigerant; and an upper frame 305 and a lower frame 306 for inserting the shaft 37 and closing the axial end face of the cylinder chamber 303. An upper exhaust muffler 308 is attached to the upper frame 305, and a lower exhaust muffler 309 is attached to the lower frame 306. The refrigerant is discharged into the internal space of the sealed container 307 through the upper discharge muffler 308 and the lower discharge muffler 309.

The closed container 307 is a cylindrical container having a lid portion and a bottom portion. A glass terminal 311 is fixed to a lid portion of the sealed container 307. Refrigerating machine oil (not shown) for lubricating the sliding parts of the compression element 301 is stored in the bottom of the sealed container 307. The shaft 37 is rotatably held by an upper frame 305 and a lower frame 306 serving as bearing portions. The rotary piston 304 eccentrically rotates in a cylinder chamber 303 inside the cylinder block 302. The shaft 37 has an eccentric shaft portion, and the rotary piston 304 is fitted in the eccentric shaft portion.

The stator 34 of the motor 100 is assembled into the sealed container 307 by press-fitting, welding, or the like, and is fixed to the inner peripheral surface of the sealed container 307. Power is supplied to the coil 5 of the stator 34 via the glass terminal 311. The rotor 33 of the motor 100 includes a permanent magnet 35 and a rotor core 36, and a shaft hole is formed in the center of the rotor core 36. The shaft 37 is fixed to the shaft hole of the rotor 33. In the motor 100, a rotor is disposed inside the stator 34, and a shaft 37 is disposed along a central axis O (fig. 1) of the stator 34 by being inserted into a shaft hole of the rotor 33.

Further, a receiver 310 for storing the refrigerant gas is mounted outside the closed vessel 307. A suction pipe 313 connected to the accumulator 310 is fixed to the closed vessel 307, and the refrigerant gas is supplied from the accumulator 310 to the cylinder 302 in the closed vessel 307 via the suction pipe 313. A discharge pipe 312 for discharging the refrigerant to the outside is provided in the lid portion of the sealed container 307.

Next, the operation of the rotary compressor 300 will be described. The refrigerant gas supplied from the accumulator 310 is supplied into the cylinder chamber 303 of the cylinder block 302 through the suction pipe 313. When the motor 100 is driven by energization of an inverter (not shown) to rotate the rotor 33, the shaft 37 rotates together with the rotation of the rotor 33. Then, the rotary piston 304 fitted to the shaft 37 eccentrically rotates in the cylinder chamber 303, and the refrigerant is compressed in the cylinder chamber 303. The refrigerant compressed in the cylinder chamber 303 passes through the upper discharge muffler 308 or the lower discharge muffler 309, and further rises through a wind hole or the like (not shown) of the rotor core 36 in the sealed container 307. The refrigerant that has risen in the sealed container 307 is discharged from the discharge pipe 312.

In the motor 100 having the stator 34, the plurality of split cores 10 are in a developed state in which they are arranged in a straight line during winding. Therefore, at the time of winding, the width of the slot 6 formed between the teeth 10b is wider than the width of the slot 6 in a state where the plurality of divided cores 10 are closed in a ring shape, so that the width of the winding nozzle 20 can be widened, and a thick winding wire can be wound. This can improve the motor efficiency of the motor 100 and increase the output. Therefore, by applying the motor 100 to the rotary compressor 300, the operation efficiency of the rotary compressor 300 can be improved, and the output can be increased.

The motor 100 having the stator 34 is not limited to the rotary compressor 300 described above, and may be applied to other types of compressors.

< refrigeration cycle device >)

Fig. 17 is a refrigerant circuit diagram showing a refrigeration cycle apparatus 400 including the compressor of fig. 16. A refrigeration cycle apparatus 400 including the rotary compressor 300 will be described below with reference to fig. 17. Hereinafter, the configuration of the refrigeration cycle apparatus 400 will be described with reference to the refrigeration cycle apparatus 400 as an air conditioner.

As shown in fig. 17, the refrigeration cycle apparatus 400 includes: a refrigerant circuit including the above-described rotary compressor 300; and a control unit 406 for controlling the operation of the refrigeration cycle apparatus 400. The refrigerant circuit is formed by connecting the rotary compressor 300, the four-way valve 401, the 1 st heat exchanger 402, the pressure reducing device 403, and the 2 nd heat exchanger 404 with refrigerant pipes 405. The 2 nd heat exchanger 404 is provided, for example, in an indoor space that is a space to be air-conditioned, and the 1 st heat exchanger 402 is provided, for example, in an outdoor space. The control unit 406 is configured by, for example, a microcomputer or the like, and controls the operations of the four-way valve 401 and the rotary compressor 300. The four-way valve 401 switches the flow direction of the refrigerant.

Next, the operation of the refrigeration cycle apparatus 400 will be described. The rotary compressor 300 compresses the sucked refrigerant to be a high-temperature and high-pressure gas refrigerant and sends the gas refrigerant. In the 1 st connection state shown by a solid line in fig. 17, the four-way valve 401 causes the refrigerant sent from the rotary compressor 300 to flow to the 1 st heat exchanger 402. When the four-way valve 401 is in the 1 st connection state, the 1 st heat exchanger 402 functions as a condenser. The 1 st heat exchanger 402 exchanges heat between the refrigerant sent from the rotary compressor 300 and air (for example, outdoor air) and sends the heat. In the 1 st heat exchanger 402, the refrigerant condenses and liquefies by radiating heat to the air. The pressure reducing device 403 expands the liquid refrigerant sent from the 1 st heat exchanger 402 and sends the expanded liquid refrigerant as a low-temperature low-pressure liquid refrigerant. When the four-way valve 401 is in the 1 st connected state, the 2 nd heat exchanger 404 functions as an evaporator. The 2 nd heat exchanger 404 exchanges heat between the low-temperature low-pressure liquid refrigerant sent from the pressure reducing device 403 and air (for example, air in the air-conditioning target space) and sends the exchanged heat. In the 2 nd heat exchanger 404, the refrigerant evaporates and gasifies by being sucked from the air. At this time, in the 2 nd heat exchanger 404, the air heat-exchanged with the refrigerant is cooled. The cooled air is supplied to the space to be air-conditioned (for example, an indoor space) by a blower (not shown), and the space to be air-conditioned is cooled. The gas refrigerant sent from the 2 nd heat exchanger 404 is sent to the rotary compressor 300 through the four-way valve 401, and is compressed again in the rotary compressor 300. Thereafter, the same cycle is repeated.

When the four-way valve 401 is in the 2 nd connected state shown by the broken line in fig. 17, the refrigerant sent from the rotary compressor 300 is sent to the 2 nd heat exchanger 404, and the 2 nd heat exchanger 404 functions as a condenser and the 1 st heat exchanger 402 functions as an evaporator. Thus, when the four-way valve 401 is in the 2 nd connection state, the air-conditioning target space is heated.

As described above, the compressor (rotary compressor 300) according to the present disclosure includes: an electric motor 100 having a stator 34 and a rotor 33 provided rotatably with respect to the stator 34; and a compression element 301 that is driven by the motor 100 and compresses the refrigerant. Thus, in the compressor (rotary compressor 300), the operation efficiency can be improved and the output can be increased.

The refrigeration cycle apparatus 400 according to the present disclosure includes a refrigerant circuit configured by connecting a compressor (rotary compressor 300), a 1 st heat exchanger 402, a pressure reducing device 403, and a 2 nd heat exchanger 404 with refrigerant pipes 405. Thus, since the refrigeration cycle apparatus 400 includes the rotary compressor 300 having an increased output, the operation efficiency can be improved, and the energy efficiency can be improved.

The refrigeration cycle apparatus 400 including the rotary compressor 300 is not limited to the above-described air conditioner. The refrigerant circuit of the refrigeration cycle apparatus 400 is not limited to the above-described refrigerant circuit, and can be appropriately modified. For example, the four-way valve 401 may be omitted in the refrigeration cycle apparatus 400.

Embodiment 2

Fig. 18 is a partial structure view of the stator according to embodiment 2, as viewed from the tooth side to the outside in the developed state before winding. Fig. 19 is a sectional view showing a C-C section of the stator of fig. 18. Fig. 20 is a sectional view showing a D-D section of the stator of fig. 18. In the stator 34 of embodiment 2, the structure of the connection coating portion 70 in the back yoke coating portion 7a of the slot insulating member 7 is different from that in the stator 34 of embodiment 1. The points of difference between the stator 34 of embodiment 2 and the case of embodiment 1 will be described below with reference to fig. 18 to 20.

In embodiment 1 described above, as shown in fig. 10 to 12, the protruding portion 71 protruding toward the axial direction is formed in the central portion 70c of the connection coating portion 70 of the slot insulating member 7, and the protruding portion 71 is not formed at the end portions of both axial sides of the connection coating portion 70. As shown in fig. 18, in the stator 34 of embodiment 2, as in the case of embodiment 1, a protruding portion 72 is formed in the coupling coating portion 70 in the back yoke coating portion 7a of the slot insulating member 7. However, in the stator of embodiment 2, the direction in which the protruding portion 72 provided in the axial center portion 70c protrudes and the position in which the protruding portion 72 is provided are different from those in the case of embodiment 1.

As shown in fig. 19, a protruding portion 72 extending in the axial direction (the arrow Z direction) and protruding radially outward is formed in the coupling coating portion 70 covering the coupling portion 10r in the back yoke coating portion 7a of the slot insulating member 7. As shown in fig. 18, two protruding portions 72 having a constant length in the axial direction (arrow Z direction) are formed in the connection coating portion 70 of each slot insulating member 7. The protruding portion 72 protruding radially outward is formed only at the upper end portion 70a and the lower end portion 70b of the coupling cover portion 70 of the back yoke cover portion 7a, but is not formed at the central portion 70c in the axial direction (arrow Z direction) of the coupling cover portion 70. As shown in fig. 20, in the expanded state, the central portion 70c in the axial direction (arrow Z direction) of the coupling cover 70 has a substantially planar shape along the inner surface 10ai of the back yoke 10 a.

As described above, the stator 34 of the motor according to embodiment 2 includes the stator core composed of the plurality of split cores 10 connected in an annular shape, the coil 5, and the insulating member 8 insulating the split cores 10 and the coil 5. Each of the split cores 10 has an arcuate back yoke 10a and teeth 10b extending from the circumferential center of the inner surface 10ai of the back yoke 10a toward the center axis O, and the coil 5 is wound around the teeth 10b of each of the split cores 10. Slots 6 in which coils 5 are arranged are formed between two adjacent teeth 10b in the stator core. The insulating member 8 has a continuous slot insulating member 7 covering the surface of the slot inner peripheral wall in the stator core. The slot insulating member 7 includes a connection coating portion 70, and the connection coating portion 70 coats a connection portion 10r connecting the two back yokes 10a in the slot inner peripheral wall, and a protruding portion 72 protruding radially outward is formed only at both side ends in the axial direction (arrow Z direction) in the connection coating portion 70.

As a result, the shape of the connection coating portion 70 of the slot insulating member 7 is stabilized by the protruding portions 72 protruding radially outward provided at the end portions on both sides in the axial direction (in the arrow Z direction), and the structure protruding into the slot 6 is not provided at the end portions on both sides in the axial direction and the central portion 70 c. Therefore, in embodiment 2 as well, similarly to embodiment 1, the winding of the connection coating portion 70 of the slot insulating member 7 at the time of switching the direction of the end portion of the tooth 10b by the winding nozzle 20 is suppressed, and the winding alignment can be ensured. Thereby, the stator 34 of the motor in which the reduction of the space factor of the coil 5 due to the arrangement failure of the windings is suppressed can be provided.

The stator 34 of embodiment 2 can be applied to the rotary compressor 300 as in the case of embodiment 1, and in this case, the operation efficiency can be improved and the output can be increased in the rotary compressor 300. In addition, as in the case of embodiment 1, a compressor (rotary compressor 300) to which the stator 34 of embodiment 2 is applied may be applied to the refrigeration cycle apparatus 400. In this case, the energy efficiency in the refrigeration cycle apparatus 400 can be improved.

Further, the embodiments may be appropriately modified or omitted. For example, in embodiments 1 and 2, the case where the stator 34 is constituted by nine divided stators is described, but the number of divided stators constituting the stator 34 is not limited to this.

Description of the reference numerals

Core sheet; upper end surface insulating member; an outer flange; inner flange; slit 2b 1; 2bi. Tooth end face coating; 2c1. Step part; end 2d 1; 2e. inclined plane; end 2e 1; a lower face insulating member; an outer flange; inner flange; slit 3b 1; tooth end face coating; 3e. inclined plane; wiring grooves; end face insulating member; coil; wires; groove; a slot insulating member; back yoke wrapping; tooth coating; boot wrap; insulation component; dividing the core; back yoke; teeth; boots; gap @ 10 g; inner surface; a joint; 20. a winding nozzle; clamp; a rotor; a stator; permanent magnet; rotor core; shaft; dividing the stator; joining the coating; 71. the protrusions; 72. the protrusions; a motor; rotary compressor; compression element; cylinder block; cylinder chamber; rotary piston; upper frame; lower frame; sealing the container; upper discharge muffler; lower discharge muffler; a reservoir; 311. Discharge tube; inhalation tube; refrigeration cycle apparatus; 401. a four-way valve; a first heat exchanger; 403. a pressure relief device; 2 nd heat exchanger; refrigerant tubing; control part; central axis.

Claims

1. A stator of an electric motor, wherein,

the stator of the motor is provided with:

a stator core formed by connecting a plurality of split cores in a circular ring shape, wherein the split cores are provided with a circular arc-shaped back yoke and teeth extending from the circumferential center to the central shaft side in the inner surface of the back yoke;

a coil wound around the teeth of the split core; and

an insulating member for insulating the split cores and the coils,

slots in which the coils are arranged are formed between two adjacent teeth in the stator core,

the insulating member has a continuous slot insulating member disposed in the slot and covering a surface of an inner peripheral wall of the slot in the stator core,

the slot insulating member includes a connecting coating portion that coats a connecting portion of the slot inner peripheral wall that connects the two back yokes,

the connecting coating portion is formed with a protrusion protruding toward the center axis side only at a central portion in the axial direction, or with a protrusion protruding toward the radial outside only at both end portions in the axial direction.

2. The stator of an electric motor according to claim 1, wherein,

the insulating member has a set of end face insulating members attached to end faces on both sides in the axial direction in the split core.

3. The stator of an electric motor according to claim 2, wherein,

the stator core has shoes protruding from both ends in a circumferential direction in the tip end portions of the teeth,

the slot insulating member includes a boot wrapping portion wrapping the boot in the slot inner peripheral wall,

slits are formed in the one set of end-face insulating members, and fix end portions of the boot wrapping portion on both sides in the axial direction.

4. The stator of an electric motor according to claim 2 or 3, wherein,

the slot insulating member includes: a back yoke coating portion that coats the back yoke in the groove inner peripheral wall; and a tooth coating portion for coating the teeth in the inner peripheral wall of the groove,

a pressing portion is formed on at least one end face insulating member of the pair of end face insulating members, and presses a boundary portion between the tooth coating portion and the back yoke coating portion in the slot insulating member toward the split core side.

5. A compressor, wherein,

the compressor is provided with:

an electric motor having the stator of the electric motor according to any one of claims 1 to 4, and a rotor provided so as to be rotatable with respect to the stator of the electric motor; and

a compression element driven by the motor and compressing the refrigerant.

6. A refrigeration cycle apparatus, wherein,

the compressor according to claim 5, the 1 st heat exchanger, the pressure reducing device, and the 2 nd heat exchanger are connected by refrigerant pipes.