Rotary electrical machine stator, rotary electrical machine, compressor, and refrigeration cycle apparatus

Abstract

This rotary electrical machine stator comprises: a cylindrical stator core in which a plurality of slots are provided in the circumferential direction; two-phase or three-phase stator windings which are disposed so as to be layered with respect to each other in the radial direction of the stator core and which each have a plurality of coils that are disposed in the circumferential direction of the stator core and that have a coil end protruding from the stator core in the axial direction; and one or two interphase insulation portions which each are disposed between the coil ends of the stator windings of two phases adjacent to each other in the radial direction in the two-phase or three-phase stator windings. The one or two interphase insulation portions are each disposed so as to correspond to the plurality of coils of the stator winding of a phase disposed on the inner circumference side or the outer circumference side, and are constituted by one or more sheets of interphase insulation paper which each are provided on a per-coil basis so as to cover the coil ends of one or more coils in the circumferential direction. The one or more sheets of interphase insulation paper that constitute at least one of the one or two interphase insulation portions each have, at both ends of the outer-edge side, which is the side on the opposite side from the stator core, protrusion portions which protrude further than the center portion of the outer-edge side.

Description

Rotating electric machine stator, rotating electric machine, compressor, and refrigeration cycle device

[0001] The present disclosure relates to a stator of a rotating electric machine having a stator winding, a rotating electric machine, a compressor, and a refrigeration cycle device.

[0002] Some stators of rotating electric machines (also referred to as electric machine stators) include interphase insulating members (also referred to as end coil insulating portions) arranged between coil ends of stator windings of different phases (see, for example, Patent Document 1). The electric machine stator of Patent Document 1 includes an insulating member formed by connecting two end coil insulating portions arranged on one side and the other side of the axial direction of the stator core via multiple connecting portions arranged in slots. The end coil insulating portions of this insulating member are arranged between phases, between the coil end of the main coil and the coil end of the auxiliary coil arranged on the inner periphery of the main coil, and are arranged at each coil end of the main coil in the circumferential direction.

[0003] Japanese Utility Model Application Publication No. 55-176052

[0004] However, in the electric stator of Patent Document 1, the outer side of the end coil insulation portion, which is the side opposite to the side connected to the multiple connection portions, is linear. As a result, when assembling the electric stator, both circumferential ends of the end coil insulation portion enter into the slots, resulting in insufficient insulation length on both ends, making it difficult to ensure insulation between the coil ends.

[0005] The present disclosure has been made against the background of the above-mentioned problems, and aims to provide a stator of a rotating electric machine, a rotating electric machine, a compressor, and a refrigeration cycle device that make it easy to ensure insulation between coil ends.

[0006] The stator of the rotating electric machine according to the present disclosure comprises: a cylindrical stator core having a plurality of slots formed in the circumferential direction; two- or three-phase stator windings arranged so as to be stacked on top of each other in the radial direction of the stator core, each having a plurality of coils arranged in the circumferential direction of the stator core, the coil ends of the plurality of coils protruding in the axial direction from the stator core; and one or two interphase insulators arranged between the coil ends of the stator windings of each of two radially adjacent phases in the two- or three-phase stator winding, wherein each of the one or two interphase insulators is arranged corresponding to the plurality of coils of the stator winding of a phase arranged on the inner or outer peripheral side, and is made up of one or more sheets of interphase insulating paper each provided to cover the coil ends of one or more coils in the circumferential direction on a coil-by-coil basis, and each of the one or more sheets of interphase insulating paper constituting one or more of the one or two interphase insulators has protrusions at both ends of an outer edge, which is the edge opposite the stator core, that protrude beyond the center of the outer edge.

[0007] A rotating electric machine according to the present disclosure includes the stator of the rotating electric machine described above, and a rotor that is provided inside the stator and rotates by magnetic action.

[0008] In addition, the compressor according to the present disclosure includes the above-mentioned rotating electric machine, a compression mechanism unit driven by the rotating electric machine and compressing refrigerant drawn in from the outside, and a sealed container that houses the rotating electric machine and the compression mechanism unit.

[0009] A refrigeration cycle device according to the present disclosure includes the above compressor, an outdoor heat exchanger, a pressure reducer, and an indoor heat exchanger.

[0010] In the stator of a rotating electric machine, the rotating electric machine, the compressor, and the refrigeration cycle device according to the present disclosure, each of the one or more interphase insulating papers constituting one or more of the one or two interphase insulating parts has protrusions at both ends of the outer edge, which is the edge opposite the stator core, that protrude beyond the center of the outer edge. As a result, even if both circumferential ends of the interphase insulating paper are pushed in during assembly of the stator of the rotating electric machine, the protrusions at both ends of the outer edge prevent the insulation length from becoming insufficient at both ends, making it easier to ensure insulation between the coil ends.

[0011] 7 is a longitudinal cross-sectional view showing a compressor according to a first embodiment. FIG. 1 is a cross-sectional view showing a first passage provided on an outer periphery of the guide frame of FIG. 1. FIG. 1 is a longitudinal cross-sectional view of a rotor of the rotating electric machine of FIG. 1. FIG. 1 is a cross-sectional view of the rotor of the rotating electric machine of FIG. 1. FIG. 1 is a cross-sectional view showing a second passage provided on an outer periphery of the stator of the rotating electric machine of FIG. 1. FIG. 2 is a refrigerant circuit diagram showing a schematic configuration of a refrigeration cycle device according to a first embodiment. FIG. 2 is a cross-sectional view showing an A-A cross section of the stator of the rotating electric machine in the compressor of FIG. 1. FIG. 3 is a diagram showing an arrangement configuration of a plurality of coils of an A-phase stator winding in the stator of the rotating electric machine of FIG. 7, as seen from one side in the axial direction. FIG. 3 is a partial cross-sectional view showing a configuration of a slot portion in the stator of the rotating electric machine according to the first embodiment. FIG. 4 is a longitudinal cross-sectional view showing a slot portion of the stator of the rotating electric machine according to the first embodiment. FIG. 4 is a cross-sectional view schematically showing the relationship between first interphase insulating paper and coils in the stator of the rotating electric machine of FIG. 7. FIG. 5 is a perspective view showing the relationship between first interphase insulating paper and coils in the stator of the rotating electric machine according to the first embodiment. FIG. 5 is a schematic view of the first interphase insulating paper in the stator of the rotating electric machine according to the first embodiment. Fig. 10 is a schematic diagram of second interphase insulating paper in the stator of the rotary electric machine according to embodiment 1. Fig. 11 is a perspective view showing the relationship between first interphase insulating paper and coils in the stator of the rotary electric machine according to embodiment 2. Fig. 12 is a cross-sectional view showing the relationship between first interphase insulating paper and coils in the stator of the rotary electric machine according to embodiment 5, from one side in the axial direction. Fig. 13 is a cross-sectional view showing the relationship between first interphase insulating paper and coils in the stator of the rotary electric machine according to embodiment 6, from one side in the axial direction.

[0012] Hereinafter, embodiments in which a rotating electric machine stator according to the present disclosure is applied to a rotating electric machine, a compressor, and a refrigeration cycle device will be described with reference to the drawings. The present disclosure is not limited to the following embodiments and can be modified in various ways without departing from the spirit and scope of the present disclosure. Furthermore, the present disclosure includes all possible combinations of the configurations shown in the following embodiments. In particular, the combinations of components are not limited to those in the respective embodiments, and components described in one embodiment can be applied to another embodiment. The rotating electric machine, compressor, and refrigeration cycle device shown in the drawings are examples of equipment to which the rotating electric machine stator of the present disclosure can be applied. The rotating electric machine, compressor, and refrigeration cycle device shown in the drawings are not intended to limit the applicable equipment of the present disclosure. In the following, a vertically mounted scroll compressor is shown as an example of a compressor, but a horizontally mounted compressor is also acceptable. In the following description, directional terms (e.g., “up,” “down,” “right,” “left,” “front,” “rear,” etc.) are used as appropriate to facilitate understanding. However, these terms are for illustrative purposes only and do not limit the present disclosure. In addition, in each drawing, the same reference numerals are used to denote the same or equivalent parts, and this is common throughout the specification. Note that in each drawing, the relative dimensions or shapes of each component may differ from those of the actual product.

[0013] Embodiment 1 Fig. 1 is a longitudinal cross-sectional view showing a compressor 100 according to Embodiment 1. The configuration and operation of the compressor 100 will be described with reference to Fig. 1. The compressor 100 is one of the components of a refrigeration cycle used in various industrial machines, such as refrigerators, freezers, air conditioners, refrigeration systems, and water heaters.

[0014] The compressor 100 draws in refrigerant circulating through a refrigeration cycle, compresses it, and discharges it in a high-temperature, high-pressure state. The compressor 100 is provided with a compression mechanism 14 in a sealed container 10, which combines a fixed scroll 1 and an orbiting scroll 2 that revolves (or orbits) relative to the fixed scroll 1. The compressor 100 also is provided with a rotating electric machine 5 in the sealed container 10, which connects the orbiting scroll 2 to a main shaft 6 and drives the orbiting scroll 2. When the compressor 100 is a vertically mounted scroll compressor as shown in FIG. 1 , the compression mechanism 14 is disposed on the upper side and the rotating electric machine 5 is disposed on the lower side within the sealed container 10, for example.

[0015] The fixed scroll 1 is composed of a base plate 1a and plate-shaped spiral teeth 1b, which are spiral protrusions provided on one surface (the lower side in FIG. 1 ) of the base plate 1a. The orbiting scroll 2 is composed of a base plate 2a and plate-shaped spiral teeth 2b, which are spiral protrusions having substantially the same shape as the plate-shaped spiral teeth 1b, provided on one surface (the upper side in FIG. 1 ) of the base plate 2a. The plate-shaped spiral teeth 1b of the fixed scroll 1 and the plate-shaped spiral teeth 2b of the orbiting scroll 2 mesh with each other to form a compression chamber 1f, the volume of which changes relatively.

[0016] The outer periphery of the fixed scroll 1 is fastened to the guide frame 4 with bolts (not shown). A suction pipe 13 is provided on the outer periphery of the base plate 1a of the fixed scroll 1, for introducing refrigerant gas from a suction port 1e through a suction check valve 1g into a compression chamber 1f. A discharge port 1d is formed in the center of the base plate 1a of the fixed scroll 1, for discharging compressed, high-pressure refrigerant gas. The compressed, high-pressure refrigerant gas is then discharged into an upper space 10a within the sealed container 10. The refrigerant gas discharged into the upper space 10a is guided to an oil separation mechanism through a refrigerant flow path 30, as will be described later, and the refrigerant gas from which the oil has been separated is discharged through a discharge pipe 12, completing a refrigeration cycle.

[0017] The orbiting scroll 2 is prevented from rotating by an Oldham mechanism 9, which allows it to revolve (orbit) relative to the fixed scroll 1 without rotating on its axis. A pair of Oldham guide grooves 1c are formed in a substantially straight line on the outer periphery of the base plate 1a of the fixed scroll 1. A pair of fixed-side keys 9a of the Oldham mechanism 9 are engaged with these Oldham guide grooves 1c so as to be able to slide back and forth. Furthermore, a pair of Oldham guide grooves 2c, which are 90 degrees out of phase with the Oldham guide grooves 1c of the fixed scroll 1, are formed in a substantially straight line on the outer periphery of the base plate 2a of the orbiting scroll 2, and a pair of orbiting-side keys 9b of the Oldham mechanism 9 are engaged with these Oldham guide grooves 2c so as to be able to slide back and forth.

[0018] The Oldham mechanism 9 configured as described above allows the orbiting scroll 2 to perform an orbiting motion (orbiting motion) without rotating on its axis. A hollow cylindrical boss 2d is formed in the center of the surface of the orbiting scroll 2 opposite the surface on which the plate-shaped spiral teeth 2b are formed (the lower side in FIG. 1). An eccentric shaft 6a (orbiting shaft) provided at the upper end of the main shaft 6 is inserted into this boss 2d. A thrust surface 2f is formed on the surface of the base plate 2a of the orbiting scroll 2 opposite the plate-shaped spiral teeth 2b (the lower side in FIG. 1). The thrust surface 2f is capable of sliding and pressure-contacting the thrust bearing 3a of the compliant frame 3. The base plate 2a of the orbiting scroll 2 is provided with a bleed hole 2g penetrating the compression chamber 1f and the thrust surface 2f, allowing refrigerant gas to be extracted and directed to the thrust surface 2f during compression.

[0019] The compliant frame 3 is housed within a guide frame 4. The compliant frame 3 has an upper cylindrical surface 3p and a lower cylindrical surface 3s on its outer periphery. The guide frame 4 has an inner periphery that is provided with an upper cylindrical surface 4c and a lower cylindrical surface 4d, into which the upper cylindrical surface 3p and the lower cylindrical surface 3s of the compliant frame 3 are fitted, respectively. The compliant frame 3 is supported in the radial direction within the guide frame 4 by fitting the upper cylindrical surface 3p with the upper cylindrical surface 4c and the lower cylindrical surface 3s with the lower cylindrical surface 4d. A main bearing 3c and an auxiliary main bearing 3d are provided in the center of the lower cylindrical surface 3s of the compliant frame 3, and these bearings radially support a main shaft 6 that is driven to rotate by a rotor 5a of a rotating electrical machine 5. A communication hole 3e is provided that axially penetrates the outer periphery of the compliant frame 3 from within the surface of the thrust bearing 3a. A thrust bearing opening 3t, which opens at the upper end of the communication hole 3e, is positioned opposite an air bleed hole 2g that penetrates the base plate 2a of the orbiting scroll 2.

[0020] The thrust bearing 3a of the compliant frame 3 has a surface (reciprocating sliding surface) 3b on which the Oldham mechanism annular portion 9c reciprocates and slides. The compliant frame 3 also has a communication hole 3f penetrating from the inner peripheral surface to the outer peripheral surface. The communication hole 3f is formed to communicate the base plate outer peripheral space 2k and the frame upper space 4a with the space inside the Oldham mechanism annular portion 9c. The compliant frame 3 also has an intermediate pressure adjustment valve space 3n between the frame upper space 4a and the boss outer space 2n for accommodating an intermediate pressure adjustment valve 3g, an intermediate pressure adjustment valve holder 3h, and an intermediate pressure adjustment spring 3k, which adjust the pressure in the boss outer space 2n. The intermediate pressure adjustment spring 3k is stored shortened from its natural length.

[0021] In the first embodiment, the compliant frame 3 and the guide frame 4 are configured as separate bodies, but this is not limiting, and both frames may be configured as a single, integrated frame.

[0022] The frame lower space 4b, formed by the inner surface of the guide frame 4 and the outer surface of the compliant frame 3, is divided above and below by ring-shaped seals 7a, 7b. Here, ring-shaped seal grooves for accommodating the ring-shaped seals 7a, 7b are formed in two locations on the inner peripheral surface of the guide frame 4, but these seal grooves may also be formed on the outer peripheral surface of the compliant frame 3. The frame lower space 4b communicates only with the communication hole 3e of the compliant frame 3 and is structured to seal in the refrigerant gas being compressed and supplied through the bleed hole 2g. In addition, the space on the outer periphery of the thrust bearing 3a, surrounded above and below by the base plate portion 2a of the orbiting scroll 2 and the compliant frame 3, i.e., the base plate outer peripheral space 2k, is a low-pressure space of the intake gas atmosphere (suction pressure).

[0023] Fig. 2 is a cross-sectional view showing a first passage 4f provided on the outer periphery of the guide frame 4 of Fig. 1. As shown in Fig. 2, the guide frame 4 is fixed to the sealed container 10 by shrink fitting or welding on its outer periphery. As shown in Figs. 1 and 2, the outer periphery of the guide frame 4 and the fixed scroll 1, i.e., the compression mechanism 14, is provided with a first passage 4f formed by a notch. Refrigerant gas discharged from the discharge port 1d into the upper space 10a of the sealed container 10 flows downward through the first passage 4f into the sealed container 10. The bottom of the sealed container 10 forms an oil reservoir 10b in which refrigerating machine oil 11 is stored.

[0024] The sealed container 10 is provided with a discharge pipe 12 that discharges refrigerant gas to the outside. The first passage 4f is provided on the opposite side of the discharge pipe 12 (the right side in FIG. 1 ). A first discharge passage 4g is provided that communicates from the center of the lower end of the guide frame 4 to the side surface, and the first discharge passage 4g communicates with the discharge pipe 12. A discharge cover 16 having an opening 16b is provided at the lower end of the guide frame 4 so as to surround the lower cylindrical portion (the portion where the lower cylindrical surface 4d is formed). A second discharge passage 16a in the discharge cover 16 is connected to the first discharge passage 4g.

[0025] The rotating electric machine 5 rotates the main shaft 6 and is composed of a rotor 5a fixed to the main shaft 6, a stator 5b fixed to the sealed container 10, and the main shaft 6, which is a rotating shaft. The rotor 5a is fixed to the main shaft 6 by shrink fitting and is provided inside the stator 5b. When current is applied to the stator 5b, the rotor 5a is driven to rotate by magnetic action, thereby rotating the main shaft 6. The upper end of the main shaft 6 is formed with an eccentric shaft portion 6a that rotatably engages with the swing bearing 2e of the swing scroll 2, and a main shaft balance weight 6f is fixed to the lower side of the eccentric shaft portion 6a by shrink fitting.

[0026] Furthermore, a main shaft portion 6b is formed below the eccentric shaft portion 6a, which rotatably engages with the main bearing 3c and auxiliary main bearing 3d of the compliant frame 3. A counter shaft portion 6c is formed at the lower end of the main shaft 6, which rotatably engages with the counter bearing 8a of the subframe 8. The subframe 8 is provided with an inlet hole 8b through which refrigerant oil 11 flows into an oil reservoir 10b. The rotor 5a of the rotating electrical machine 5 is fixed by shrink-fitting between the counter shaft portion 6c and the main shaft portion 6b. The main shaft 6 is provided with an oil supply passage 6d formed as a hole penetrating in the axial direction, and an oil supply port 6e at the lower end of the oil supply passage 6d is immersed in refrigerant oil 11 stored at the bottom of the sealed container 10. Therefore, refrigerant oil 11 is sucked up from the oil supply port 6e by an oil supply mechanism or pump mechanism provided below the main shaft 6. The upper end of the oil supply passage 6d opens into the boss portion 2d of the orbiting scroll 2, and the sucked-up refrigeration oil 11 flows from the upper end opening of the oil supply passage 6d to the orbiting bearing 2e to lubricate the eccentric shaft portion 6a and the orbiting bearing 2e. In addition, an oil supply hole 6g branching off in the horizontal direction is provided in the oil supply passage 6d, and refrigeration oil 11 is supplied from this oil supply hole 6g to the auxiliary main bearing 3d to lubricate the auxiliary main bearing 3d and the main shaft portion 6b. The oil supply hole for the main bearing 3c is not shown in Figure 1.

[0027] A first balance weight 15a is fixed to the upper end surface of the rotor 5a, and a second balance weight 15b is fixed to the lower end surface at diagonally opposite eccentric positions. Furthermore, within the outer space of the boss portion 2d, the aforementioned main shaft balance weight 6f is fixed to the main shaft 6 below the eccentric shaft portion 6a. These three balance weights offset the imbalance of centrifugal force and moment force that occurs when the orbiting scroll 2 orbits via the eccentric shaft portion 6a of the main shaft 6, thereby achieving static and dynamic balance.

[0028] Furthermore, a first cup-shaped member 17 containing a first balance weight 15a is fixed to the upper end surface of the rotor 5a, and a second cup-shaped member 18 containing a second balance weight 15b is fixed to the lower end surface of the rotor 5a. An upper opening 17a of the first cup-shaped member 17 faces the opening 16b of the discharge cover 16. The second cup-shaped member 18 is attached with its opening facing downward.

[0029] FIG. 3 is a longitudinal cross-sectional view of the rotor 5a of the rotating electric machine 5 of FIG. 1 . FIG. 4 is a transverse cross-sectional view of the rotor 5a of the rotating electric machine 5 of FIG. 1 . As shown in FIGS. 1 , 3 , and 4 , the rotor 5a is provided with a plurality of through-flow passages 5f penetrating in the axial direction. The through-flow passages 5f are provided penetrating the bottoms of the first cup-shaped member 17 and the second cup-shaped member 18, avoiding the positions of the first balance weight 15a and the second balance weight 15b. The first cup-shaped member 17 and the second cup-shaped member 18 are preferably made of a non-magnetic material. The through-flow passages 5f may be formed penetrating the first balance weight 15a and the second balance weight 15b, or may be provided avoiding the positions of the first cup-shaped member 17 and the second cup-shaped member 18. The plurality of through-flow passages 5f are formed symmetrically or point-symmetrically with respect to the axis.

[0030] Fig. 5 is a cross-sectional view showing a second passage 5g provided on the outer periphery of the stator 5b of the rotating electric machine 5 of Fig. 1. As shown in Fig. 1 and Fig. 5, the outer periphery of the stator 5b of the rotating electric machine 5 is fixed to the sealed container 10 by shrink fitting, welding, or the like. The outer periphery of the stator 5b is provided with a second passage 5g formed by a notch. The first passage 4f and the second passage 5g constitute a refrigerant flow path 30 that guides the refrigerant gas discharged from the discharge port 1d to the bottom of the sealed container 10.

[0031] As shown in FIG. 1, a glass terminal 10c is provided on the side surface of the sealed container 10, and the glass terminal 10c and the stator 5b of the rotating electrical machine 5 are connected by a lead wire 5h.

[0032] Next, the operation of the compressor 100 according to the first embodiment will be described. When the compressor 100 is started up or running, refrigerant is drawn into the suction pipe 13 and enters the compression chamber 1f, which is formed by the meshing of the plate-shaped spiral teeth 1b of the fixed scroll 1 and the plate-shaped spiral teeth 2b of the orbiting scroll 2. The orbiting scroll 2, driven by the rotary electric machine 5, reduces the volume of the compression chamber 1f as it orbits eccentrically. This compression stroke increases the pressure of the drawn refrigerant. During this compression stroke, intermediate-pressure refrigerant gas is guided from the bleed hole 2g of the orbiting scroll 2 through the communication hole 3e of the compliant frame 3 to the frame lower space 4b, maintaining an intermediate-pressure atmosphere in this frame lower space 4b.

[0033] The mixed gas of refrigerant and refrigerating machine oil 11 discharged from the discharge port 1d of the fixed scroll 1 into the upper space 10a of the sealed container 10 after the compression stroke passes through a refrigerant flow path 30 consisting of a first passage 4f provided on the outer periphery of the compression mechanism 14 and a second passage 5g provided on the outer periphery of the stator 5b of the rotating electric machine 5, and is guided to the space below the rotating electric machine 5, i.e., to the bottom of the sealed container 10. The mixed gas is separated during the process of being guided to the bottom of the sealed container 10. The refrigerant gas separated from the refrigerating machine oil 11 enters the interior through an opening of a second cup-shaped member 18 attached to the lower end surface of the rotor 5a of the rotating electric machine 5 and flows into a through-flow passage 5f provided in the rotor 5a. The refrigerant gas from which the refrigerating machine oil 11 has been separated rises inside a first cup-shaped member 17 attached to the upper end surface of the rotor 5a and flows into the discharge cover 16. Furthermore, the refrigerant gas from which the refrigerating machine oil 11 has been separated passes through the second discharge passage 16 a in the discharge cover 16 , the first discharge passage 4 g , and further passes through the discharge pipe 12 to be discharged outside the sealed container 10 .

[0034] Next, a refrigeration cycle apparatus 200, such as an air conditioner, to which the compressor 100 is connected will be described. FIG. 6 is a refrigerant circuit diagram showing a schematic configuration of the refrigeration cycle apparatus 200 according to the first embodiment. The refrigeration cycle apparatus 200 is, for example, an air conditioner to which the compressor 100 is connected. The refrigeration cycle apparatus 200 includes a suction muffler 101 connected to the suction side of the compressor 100, a four-way switching valve 103 connected to the discharge side of the compressor 100 for switching the flow of refrigerant from the compressor 100, an outdoor heat exchanger 104, a pressure reducer 105 such as an electric expansion valve, and an indoor heat exchanger 106, which are sequentially connected via piping to form a refrigeration circuit. In general, in a refrigeration air conditioning system, the indoor heat exchanger 106 is installed in an indoor unit, and the remaining components, the compressor 100, the four-way switching valve 103, the outdoor heat exchanger 104, and the pressure reducer 105, are installed in an outdoor unit.

[0035] For example, in heating operation of the air conditioner, four-way switching valve 103 is connected to the solid line side in Figure 6. High-temperature, high-pressure refrigerant compressed by compressor 100 flows to indoor heat exchanger 106, condenses, and liquefies, and is then throttled by pressure reducer 105 to become a two-phase refrigerant with low temperature and low pressure. The refrigerant then flows to outdoor heat exchanger 104, evaporates, and gasifies before returning to compressor 100 through four-way switching valve 103. In other words, the refrigerant circulates as shown by the solid arrows in Figure 6. Through this circulation, the refrigerant exchanges heat with outside air in outdoor heat exchanger 104, which serves as an evaporator, and the refrigerant sent to outdoor heat exchanger 104 absorbs heat. The refrigerant that has absorbed heat is then sent to indoor heat exchanger 106, which serves as a condenser, where it exchanges heat with indoor air and warms the indoor air.

[0036] In cooling operation, the four-way switching valve 103 is connected to the dashed line side in Figure 6. The high-temperature, high-pressure refrigerant compressed by the compressor 100 flows to the outdoor heat exchanger 104, where it condenses and liquefies. The refrigerant is then throttled by the pressure reducer 105, becoming a two-phase refrigerant with low temperature and low pressure. The refrigerant then flows to the indoor heat exchanger 106, evaporates, and gasifies before returning to the compressor 100 through the four-way switching valve 103. That is, when the operation mode switches from heating to cooling, the indoor heat exchanger 106 changes from a condenser to an evaporator, and the outdoor heat exchanger 104 changes from an evaporator to a condenser. Thus, the refrigerant circulates as shown by the dashed arrows in Figure 6. Through this circulation, the indoor heat exchanger 106, which functions as an evaporator, exchanges heat with the indoor air, absorbing heat from the indoor air and cooling it. The refrigerant that has absorbed heat is then sent to the outdoor heat exchanger 104, which functions as a condenser, where it exchanges heat with the outdoor air and releases heat to the outdoor air.

[0037] Examples of the refrigerant include a fluorine-based refrigerant or a hydrocarbon-based refrigerant with a low global warming potential (GWP). Examples of the refrigerant include a single refrigerant such as R1234yf, R1234ze, R32, or R290, a mixture of two or more of these, or a mixture of any of these with other refrigerants. Examples of the refrigerant include a mixed refrigerant containing R1132(E) or a mixed refrigerant containing R1123. Examples of the refrigerant include a mixed refrigerant containing R516A, R410A, R445A, R444A, R454C, R444B, R454A, R455A, R457A, R459B, R452B, R454B, R447B, R447A, R446A, and R459A.

[0038] Next, the rotating electric machine 5 according to the present disclosure, particularly the stator 5b, will be described in detail. FIG. 7 is a cross-sectional view showing the A-A cross section of the stator 5b of the rotating electric machine 5 in the compressor 100 of FIG. 1. FIG. 8 is a view from one axial direction showing the arrangement of the multiple coils 52a to 52f of the A-phase stator winding 52 in the stator 5b of the rotating electric machine 5 of FIG. 7. That is, in FIG. 8, the B-phase stator winding 53 and the C-phase stator winding 54 shown in FIG. 7 are omitted from the illustration. FIG. 9 is a partial cross-sectional view showing the configuration of the slots sp in the stator 5b of the rotating electric machine 5 according to the first embodiment. FIG. 10 is a vertical cross-sectional view showing the slots sp in the stator 5b of the rotating electric machine 5 according to the first embodiment.

[0039] 7 and 10, the stator 5b includes a cylindrical stator core 51 having a plurality of slots sp formed in the circumferential direction, and three-phase stator windings 52, 53, and 54 arranged so as to be stacked on top of each other in the radial direction of the stator core 51. Each of the three-phase stator windings 52, 53, and 54 has a plurality of coils arranged in the circumferential direction of the stator core 51. Each coil has a coil end protruding from the stator core 51. The stator 5b also includes two interphase insulators arranged between the coil ends of the stator windings of each of two radially adjacent phases.

[0040] The stator 5b is not limited to having the above-described three-phase stator windings 52, 53, and 54, but may have a two-phase stator winding. In a configuration in which the stator 5b has a two-phase stator winding, the stator 5b has one interphase insulation portion.

[0041] Hereinafter, the phases of the three-phase stator windings 52, 53, 54 are defined as phase A, phase B, and phase C. In this case, the two interphase insulators are a first interphase insulator In1 arranged between the coil end of the A-phase stator winding 52 and the coil end of the B-phase stator winding 53, and a second interphase insulator In2 arranged between the coil end of the B-phase stator winding 53 and the coil end of the C-phase stator winding 54. Hereinafter, the coil end of the A-phase stator winding 52 may be referred to as an A-phase coil end 521, the coil end of the B-phase stator winding 53 may be referred to as a B-phase coil end 531, and the coil end of the C-phase stator winding 54 may be referred to as a C-phase coil end 541.

[0042] The stator core 51 is manufactured by laminating multiple electromagnetic steel sheets in the axial direction, and includes a cylindrical core back portion 51a and multiple teeth 51b protruding radially inward from the core back portion 51a. The core back portion 51a and the multiple teeth 51b form multiple slots sp between the teeth 51b. Coils of the stator winding 52 are inserted into these slots sp.

[0043] In this embodiment, the stator 5b has a pole number p and a slot number s (number of slot portions sp) that satisfy the relationship s = 3p, and the number of coils in the stator winding for each phase is s / 3. In the following, the slot number s is defined as 18, and the pole number p is defined as 6.

[0044] 9 and 10 , the stator 5b includes slot cells 55, which are insulating materials arranged in the slots sp between the stator core 51 and the stator windings 52. The stator 5b also includes wedges 56, which are insulating materials arranged in the slots sp on the radially inward opening side of the slots sp. The wedges 56 prevent the stator windings 52 from falling out of the slots sp, i.e., to the inner periphery of the stator core 51.

[0045] 7 and 8, a stator winding 52 is wound around each of the teeth 51b of the stator core 51, for every three slots sp. Specifically, the stator winding 52 is wound around the teeth 51b in a circular shape when viewed from a cross section perpendicular to the axial direction of the stator winding 52. The A-phase stator winding 52 is wound around the outermost periphery of the stator core 51. The B-phase stator winding 53 is wound around the inner periphery of the A-phase stator winding 52, adjacent to the A-phase stator winding 52. The C-phase stator winding 54 is wound around the innermost periphery, i.e., the inner periphery of the B-phase stator winding 53, adjacent to the B-phase stator winding 53.

[0046] The A-phase stator winding 52 has six coils 52a, 52b, 52c, 52d, 52e, and 52f. Similarly, the B-phase stator winding 53 and the C-phase stator winding 54 each have six coils. The arrangement of the multiple coils 52a to 52f will be described later.

[0047] As shown in Fig. 8 , one slot sp in which two coils of the A-phase stator winding 52 are arranged to overlap is provided for every three slots sp. Also, as shown in Fig. 7 , one slot sp in which two coils of the B-phase stator winding 53 are arranged to overlap is provided for every three slots sp, and one slot sp in which two coils of the C-phase stator winding 54 are arranged to overlap is provided for every three slots sp. The position of the slot sp in which two coils are arranged to overlap differs for each phase. That is, for every three slots sp, two A-phase coils are arranged to overlap in one slot sp, two B-phase coils are arranged to overlap in another slot sp, and two C-phase coils are arranged to overlap in the remaining slot sp.

[0048] 7 and 10 , the coil end of the A-phase stator winding 52 (A-phase coil end 521) is located closer to the outer periphery of the stator core 51 than the coil end of the B-phase stator winding 53 (B-phase coil end 531) and the coil end of the C-phase stator winding 54 (C-phase coil end 541). The coil end of the B-phase stator winding 53 is located between the coil end of the A-phase stator winding 52 and the coil end of the C-phase stator winding 54. The coil end of the C-phase stator winding 54 is located closer to the inner periphery of the stator core 51 than the coil end of the B-phase stator winding 53.

[0049] That is, when assembling the stator 5b, the B-phase stator winding 53 is arranged in the slots sp after the A-phase stator winding 52, and the C-phase stator winding 54 is arranged in the slots sp after the B-phase stator winding 53. Also, in Figures 7, 8 and 10, the coil ends of the three-phase stator windings 52, 53, 54 of the stator 5b widen radially outward from the stator core 51 toward the tip. Therefore, when assembling the stator 5b, a process is also carried out in which the coil ends of the three-phase stator windings 52, 53, 54 protruding from the stator core 51 are flattened to form the coil ends that widen outward as described above.

[0050] 7, 8, and 10, the arrangement of the multiple coils in the stator windings 52, 53, and 54 of each phase will be described. Note that while the coils of the A-phase stator winding 52 will be described here, the coils of the B-phase stator winding 53 and the coils of the C-phase stator winding 54 also adopt an arrangement similar to the arrangement of the multiple coils 52a to 52f of the A-phase stator winding 52, except that they are positioned in different slots sp.

[0051] 8, in a slot portion sp where two coils of the A-phase stator winding 52 are arranged to overlap, coils 52a, 52c, and 52e of the A-phase stator winding 52 are arranged on the outer circumferential side of coils 52b, 52d, and 52f of the A-phase stator winding 52. The same is true for the B-phase stator winding 53 and the C-phase stator winding 54.

[0052] 8 and 10 , the ends of the multiple coils 52a to 52f of the A-phase stator winding 52 that protrude in the axial direction from the stator core 51 are A-phase coil ends 521. Similarly, the ends of the multiple coils of the B-phase stator winding 53 that protrude in the axial direction from the stator core 51 are B-phase coil ends 531, and the ends of the multiple coils of the C-phase stator winding 54 that protrude in the axial direction from the stator core 51 are C-phase coil ends 541. In other words, the coil ends are crossover wires that connect the axially extending portions of the coils that are disposed in the slots sp.

[0053] Next, the first interphase insulator In1 and the second interphase insulator In2 will be described in detail. FIG. 11 is a cross-sectional view schematically showing the relationship between the first interphase insulating paper 57 and the coils in the stator 5b of the rotating electric machine 5 of FIG. 7. In FIG. 11, for ease of explanation, the diagonal lines representing the cross sections of the coils are omitted. FIG. 12 is a perspective view showing the relationship between the first interphase insulating paper 57 and the coils in the stator 5b of the rotating electric machine 5 according to the first embodiment. FIG. 13 is a schematic diagram of the first interphase insulating paper 57 in the stator 5b of the rotating electric machine 5 according to the first embodiment. FIG. 14 is a schematic diagram of the second interphase insulating paper 58 in the stator 5b of the rotating electric machine 5 according to the first embodiment.

[0054] As shown in Fig. 11 , first interphase insulating paper 57, which is an insulating material, is arranged between A-phase coil end 521 and B-phase coil end 531. Furthermore, second interphase insulating paper 58, which is also an insulating material, is arranged between B-phase coil end 531 and C-phase coil end 541. In Fig. 11 , first interphase insulating paper 57 is indicated by a dashed line, and second interphase insulating paper 58 is indicated by a two-dot chain line. First interphase insulating paper 57 and second interphase insulating paper 58 are made of, for example, PET film.

[0055] 13 and 14, the first interphase insulating paper 57 and the second interphase insulating paper 58 each have a substantially rectangular shape. As shown in Figures 11 and 12, the circumferential length L1 (see Figure 13) of the first interphase insulating paper 57 is equal to the circumferential length of the two coils, and the circumferential length L2 (see Figure 14) of the second interphase insulating paper 58 is equal to the circumferential length of the two coils.

[0056] 10 to 12 , first interphase insulating paper 57 is arranged at 120-degree intervals to cover two coil ends of the same phase from one radial direction. Specifically, first interphase insulating paper 57 is arranged to cover two A-phase coil ends 521 from the inner circumferential side, i.e., the side of B-phase coil end 531. For simplicity of explanation, FIGS. 11 and 12 show one sheet of first interphase insulating paper 57 covering two coils 52b and 52c of the six coils 52a to 52f of A-phase stator winding 52 shown in FIGS. 7 and 8 , and the coil ends of these two coils 52b and 52c. However, it is defined that one sheet of first interphase insulating paper 57 is similarly arranged for every two coils for the other four coils 52a, 52d, 52e, and 52f. That is, the coil ends of coils 52f and 52a are covered with another sheet of first interphase insulating paper 57, and the coil ends of coils 52d and 52e are covered with yet another sheet of first interphase insulating paper 57.

[0057] That is, the multiple A-phase coil ends 521 and the multiple B-phase coil ends 531 of the stator 5b are insulated by multiple sheets of first interphase insulating paper 57 arranged in a circular shape when viewed from one side in the axial direction. The first interphase insulating paper 57 is supported by being sandwiched between the A-phase coil ends 521 on the outer periphery and the B-phase coil ends 531 on the inner periphery.

[0058] The number of A-phase coil ends 521 covered by one sheet of first interphase insulating paper 57 is not limited to two and may be one, three, or more. That is, the circumferential length L1 of the first interphase insulating paper 57 is set so that the first interphase insulating paper 57 can circumferentially cover one or more coil ends for each coil of the corresponding phase. In FIG. 11 , there are six A-phase coil ends 521, so when the first interphase insulating paper 57 covers one A-phase coil end 521, a total of six sheets of first interphase insulating paper 57 are used. Furthermore, when the first interphase insulating paper 57 covers three A-phase coil ends 521, a total of two sheets of first interphase insulating paper 57 are used.

[0059] That is, the first interphase insulating paper 57 that insulates the multiple A-phase coil ends 521 and the multiple B-phase coil ends 531 may be one or more sheets, and the above-mentioned first interphase insulating portion In1 is made up of one or more sheets of first interphase insulating paper 57.

[0060] Circumferentially adjacent first interphase insulating papers 57 are arranged so that they overlap each other at both circumferential ends so that there are no gaps between the first interphase insulating papers 57. Note that in a configuration in which the coils of each phase are arranged at intervals in the circumferential direction, specifically in a configuration in which there are slots sp in which the A-phase coil is not arranged, there are portions in the circumferential direction where the first interphase insulating paper 57 is not required. In such cases, circumferentially adjacent first interphase insulating papers 57 may be arranged at a distance. In other words, it is sufficient that each A-phase coil end 521 is covered from one circumferential end to the other with a single first interphase insulating paper 57, and a portion (the circumferential end of the A-phase coil end 521) may be doubly covered with this first interphase insulating paper 57 and another first interphase insulating paper 57.

[0061] 10 and 11, second interphase insulating paper 58 is arranged at 120-degree intervals so as to cover two coil ends of the same phase from one radial direction. Specifically, second interphase insulating paper 58 is arranged so as to cover two B-phase coil ends 531 from the inner circumferential side, i.e., the side of C-phase coil end 541. For the sake of simplicity, FIG. 11 shows one sheet of second interphase insulating paper 58 covering two of the six coils of B-phase stator winding 53 shown in FIG. 7 and the B-phase coil ends 531 of those two coils; however, it is defined that one sheet of second interphase insulating paper 58 is arranged for every two coils for the other four coils as well.

[0062] That is, the multiple B-phase coil ends 531 and the multiple C-phase coil ends 541 of the stator 5b are insulated by multiple sheets of second interphase insulating paper 58 arranged in a circular shape when viewed from one side in the axial direction. The second interphase insulating paper 58 is supported by being sandwiched between the B-phase coil ends 531 on the outer periphery and the C-phase coil ends 541 on the inner periphery.

[0063] The number of B-phase coil ends 531 covered by one sheet of second interphase insulating paper 58 is not limited to two and may be one, three, or more. That is, the circumferential length L2 of the second interphase insulating paper 58 is set so that the second interphase insulating paper 58 can circumferentially cover one or more coil ends for each coil of the corresponding phase. In FIG. 11 , there are six B-phase coil ends 531, so when the second interphase insulating paper 58 covers one B-phase coil end 531, a total of six sheets of second interphase insulating paper 58 are used. Furthermore, when the second interphase insulating paper 58 covers three B-phase coil ends 531, a total of two sheets of second interphase insulating paper 58 are used.

[0064] That is, the second interphase insulating paper 58 that insulates the multiple B-phase coil ends 531 and the multiple C-phase coil ends 541 may be one or more sheets, and the above-mentioned second interphase insulating portion In2 is made up of one or more sheets of second interphase insulating paper 58.

[0065] Circumferentially adjacent second interphase insulating papers 58 are arranged so that they overlap each other at both circumferential ends so that there are no gaps between the second interphase insulating papers 58. However, in a configuration in which the coils of each phase are arranged at intervals in the circumferential direction, specifically in a configuration in which there is a slot portion sp in which the C-phase coil is not arranged, there are also portions in the circumferential direction where second interphase insulating paper 58 is not required, and therefore it is not necessary to provide second interphase insulating paper 58 in those portions. In other words, it is sufficient for each B-phase coil end 531 to be covered from one circumferential end to the other with a single second interphase insulating paper 58, and a portion (the circumferential end of the B-phase coil end 531) may be doubly covered with this second interphase insulating paper 58 and another second interphase insulating paper 58.

[0066] 11 and 12, first interphase insulating paper 57 insulating A-phase coil end 521 from B-phase coil end 531 was arranged so as to cover two A-phase coil ends 521, i.e., corresponding to the outer peripheral A-phase coil, but it may also be arranged so as to cover two B-phase coil ends 531, i.e., corresponding to the inner peripheral B-phase coil. Also, in the example of Fig. 11, second interphase insulating paper 58 insulating B-phase coil end 531 from C-phase coil end 541 was arranged so as to cover two B-phase coil ends 531, i.e., corresponding to the outer peripheral B-phase coil, but it may also be arranged so as to cover two C-phase coil ends 541, i.e., corresponding to the inner peripheral C-phase coil.

[0067] 10 to 13, first interphase insulating paper 57 has protrusions 57b that protrude beyond the center of outer side 57a at both ends of outer side 57a, which is the side of first interphase insulating paper 57 opposite to stator core 51. Also, as shown in Figures 10 to 12 and 14, second interphase insulating paper 58 has protrusions 58b that protrude beyond the center of outer side 58a at both ends of outer side 58a, which is the side of second interphase insulating paper 58 opposite to stator core 51.

[0068] 10 to 14, the functions of the first interphase insulating paper 57 and the second interphase insulating paper 58 in the stator 5b of the rotating electric machine 5 of this embodiment will be described. Hereinafter, the first interphase insulating paper 57 and the second interphase insulating paper 58 will not be particularly distinguished from each other, and may be simply referred to as interphase insulating paper.

[0069] In this embodiment, each interphase insulating paper is arranged to cover two coil ends of a phase located on either the inner or outer circumferential side. The ends of the interphase insulating paper covering the two coil ends are prone to sagging due to the lack of supporting coil ends. As described above, the interphase insulating paper of the present disclosure is configured with protrusions 57b, 58b at both ends of the outer edges 57a, 58a, which protrude beyond the centers of the outer edges 57a, 58a. With this configuration, even if the ends of the outer edges 57a, 58a of the interphase insulating paper get between the coil ends of radially adjacent phases during assembly of the stator 5b, the protrusions 57b, 58b make it easier to ensure insulation between the coil ends.

[0070] For example, if both ends of the inner edge 57 d of the first interphase insulating paper 57, which is the edge facing the stator core 51, enter into the slots sp in which the A-phase stator windings 52 are disposed, there is a concern that the insulation length between the A-phase coil end 521 and the B-phase coil end 531 at both ends of the outer edge 57 a of the first interphase insulating paper 57 may be insufficient. However, in the present disclosure, because protrusions 57 b are provided at both ends of the outer edge 57 a of the first interphase insulating paper 57, even if both circumferential ends of the first interphase insulating paper 57 covering the two A-phase coil ends 521 enter deeply, a longer insulation length can be ensured at both ends of the outer edge 57 a by the amount of the protrusions 57 b. As a result, the insulation reliability between the A-phase coil end 521 and the B-phase coil end 531 is improved.

[0071] Furthermore, for example, if both ends of the inner edge 58 d of the second interphase insulating paper 58, which is the edge facing the stator core 51, enter into the slots sp in which the B-phase stator winding 53 is disposed, there is a concern that the insulation length between the B-phase coil end 531 and the C-phase coil end 541 at both ends of the outer edge 58 a of the second interphase insulating paper 58 may be insufficient. However, in the present disclosure, protrusions 58 b are provided at both ends of the outer edge 58 a of the second interphase insulating paper 58. Therefore, even if both circumferential ends of the second interphase insulating paper 58 covering the two B-phase coil ends 531 enter deeply, a longer insulation length can be ensured at both ends of the outer edge 58 a by the amount of the protrusions 58 b. As a result, the insulation reliability between the B-phase coil end 531 and the C-phase coil end 541 is improved.

[0072] Furthermore, during coil end forming, i.e., the process of axially crushing the ends of the multiple coils of the three-phase stator windings 52, 53, and 54 that protrude axially from the stator core 51 so that they spread outward toward the periphery, there is a concern that the insulation length may be insufficient, as in the above-described case. However, in the present disclosure, the protrusions 57b and 58b ensure the insulation length and improve insulation reliability. Note that if the height of the outer edges 57a and 58a of the interphase insulating paper were increased along the entire length, the protrusions would protrude more from the coil ends, increasing the risk of contact with other components in the compressor 100 or interference in later manufacturing processes. Therefore, in the present disclosure, the protrusions 57b and 58b are provided only on both ends of the outer edges 57a and 58a of the interphase insulating paper.

[0073] Incidentally, conventional insulating members have a configuration in which two end coil insulating portions, located on one side and the other side of the stator core 51 in the axial direction, are connected via multiple connecting portions located in the slots sp. Therefore, when assembling a conventional stator 5b, the main coil is inserted into the slots sp, then the insulating member is attached, and then the auxiliary coil is inserted. Generally, equipment for inserting stator windings into the slots sp includes equipment (devices) that performs the complete set of inserting slot cells 55 and stator windings. However, when using insulating members with complex shapes in which the end coil insulating portions and connecting portions are integrated, as in the conventional case, a special device is required for installing the insulating member for automation.

[0074] On the other hand, in the present disclosure, the interphase insulating paper is configured separately from the slot cells 55 and only needs to be placed between the coil ends of different phases. Therefore, when assembling the stator 5b, equipment is used to insert the slot cells 55 and the stator windings 52, 53, 54, and the interphase insulating paper, which is configured separately from the slot cells 55, only needs to be inserted between the coil ends of different phases from the outside. Therefore, when the interphase insulating paper of the present disclosure is used, no special equipment as in the past is required when assembling the stator 5b, and it is sufficient to add simple functions to general equipment.

[0075] Furthermore, because the interphase insulating paper has protrusions 57b, 58b, even if the interphase insulating paper gets stuck deep between the coil ends during the process of inserting the interphase insulating paper during assembly of the stator 5b, the position can be adjusted by grasping the protrusions 57b, 58b and pulling it out. The process of inserting the interphase insulating paper may be performed automatically by equipment or manually by an operator. In this way, the interphase insulating paper is prevented from getting stuck into the slots sp, ensuring insulation and improving workability.

[0076] The first interphase insulating paper 57 and the second interphase insulating paper 58 may be arranged on only one side (the upper or lower side in Figure 10) of the A-phase coil end 521, B-phase coil end 531, and C-phase coil end 541, which respectively protrude from the stator core 51 in one axial direction and the other, or they may be arranged on both sides as shown in Figure 10.

[0077] Furthermore, if at least one of the first interphase insulator In1 and the second interphase insulator In2 is made of interphase insulating paper having the above-mentioned protrusions 57b, 58b, the above-mentioned effect of ensuring insulation can be obtained at least between the phases where the interphase insulating paper is arranged.

[0078] 13 and 14, first R-chamfered portions 57c and 58c are formed at the tips of protrusions 57b and 58b. That is, the tips of protrusions 57b and 58b are curved. Also, second R-chamfered portions 57e and 58e are formed at both corners of inner edges 57d and 58d, which are the edges of the interphase insulating paper that face stator core 51. That is, the two corners of the interphase insulating paper that face stator core 51 are curved.

[0079] In this way, rounding the corners of first interphase insulating paper 57 and second interphase insulating paper 58 can prevent damage to stator windings 52, 53, 54. Stator windings 52, 53, 54 themselves have coatings, and this coating is prevented from being damaged.

[0080] Furthermore, the arc radius of the first R-chamfered portions 57 c, 58 c is smaller than the arc radius of the second R-chamfered portions 57 e, 58 e. With this configuration, the protruding length of the protrusions 57 b, 58 b can be longer than when the arc radius of the first R-chamfered portions 57 c, 58 c is larger than the arc radius of the second R-chamfered portions 57 e, 58 e. Therefore, the insulation length can be longer to more reliably insulate the coil ends from each other, addressing the problem of insufficient insulation length at both ends of the outer edges 57 a, 58 a of the interphase insulating paper.

[0081] In addition, the end of the coil end on the stator core 51 side may be, for example, arranged so that the slot cells 55 arranged in the slot portions sp protrude from the stator core 51, and covered by this protruding portion.

[0082] As described above, the stator 5b of the rotating electric machine 5 according to the first embodiment includes a cylindrical stator core 51 having a plurality of slots sp formed in the circumferential direction. The stator 5b also includes two- or three-phase stator windings (e.g., three-phase stator windings 52, 53, and 54) arranged so as to be stacked on top of one another in the radial direction of the stator core 51. Each of the three-phase stator windings has a plurality of coils arranged in the circumferential direction of the stator core 51, and the coil ends of the plurality of coils protrude in the axial direction from the stator core 51. The stator 5b also includes one or two interphase insulators (e.g., a first interphase insulator In1 and a second interphase insulator In2) arranged between the coil ends of each of two radially adjacent stator windings of the two- or three-phase stator windings. Each of the one or two interphase insulators is arranged corresponding to the multiple coils of the stator winding of the phase arranged on the inner or outer circumferential side, and is composed of one or more sheets of interphase insulating paper provided so as to cover the coil ends of one or more coils in the circumferential direction on a coil-by-coil basis. Each of the one or more sheets of interphase insulating paper constituting one or more of the one or two interphase insulators has protrusions 57b, 58b at both ends of outer sides 57a, 58a, which are the sides opposite stator core 51, that protrude beyond the centers of outer sides 57a, 58a.

[0083] In this way, in the stator 5b of the rotating electric machine 5, each of the one or more sheets of interphase insulating paper constituting one or more of the one or two interphase insulating portions has protrusions 57b, 58b that protrude beyond the center of the outer side at both ends of the outer sides 57a, 58a, which are the sides opposite the stator core 51. As a result, even if both circumferential ends of the interphase insulating paper (first interphase insulating portion In1, second interphase insulating portion In2) are inserted during assembly of the stator 5b of the rotating electric machine 5, the protrusions 57b, 58b at both ends of the outer sides 57a, 58a prevent the insulation length from becoming insufficient at both ends, making it easier to ensure insulation between the coil ends.

[0084] The two-phase or three-phase stator windings provided in stator 5b are three-phase stator windings 52, 53, and 54. The stator core 51 and the three-phase stator windings 52, 53, and 54 have a pole number p and a slot number s that satisfy s = 3p, and the number of coils in each phase of stator winding 52, 53, and 54 is s / 3. The one or two interphase insulators provided in stator 5b are two interphase insulators. If the phases of the three-phase stator windings 52, 53, 54 are defined as phase A, phase B, and phase C, the two interphase insulation sections are first interphase insulation section In1, which is made up of one or more sheets of first interphase insulation paper 57 arranged circumferentially and is arranged between the coil end of the A-phase stator winding 52 and the coil end of the B-phase stator winding 53, and second interphase insulation section In2, which is made up of one or more sheets of second interphase insulation paper 58 arranged circumferentially and is arranged between the coil end of the B-phase stator winding 53 and the coil end of the C-phase stator winding 54.

[0085] This has the effect of making it easier to ensure insulation between the coil ends even in a stator 5b equipped with three-phase stator windings 52, 53, 54, which have become mainstream in recent years. Specifically, it becomes easier to ensure insulation between A-phase coil end 521 and B-phase coil end 531, and insulation between B-phase coil end 531 and C-phase coil end 541.

[0086] Furthermore, the rotating electric machine 5 according to the first embodiment includes the stator 5b of the rotating electric machine 5 described above, and a rotor 5a that is provided inside the stator 5b and rotates by magnetic action. This makes it possible to provide a rotating electric machine 5 with high insulation reliability.

[0087] The compressor 100 according to the first embodiment includes the rotating electric machine 5, a compression mechanism 14 that is driven by the rotating electric machine 5 and compresses refrigerant drawn from the outside, and a sealed container 10 that houses the rotating electric machine 5 and the compression mechanism 14. This makes it possible to provide the compressor 100 with high insulation reliability.

[0088] The refrigerant may be any one of R1234yf, R1234ze, R32, and R290, a mixture of two or more of these, a mixture of any of these with another refrigerant, a mixture including R1132(E), or a mixture including R1123, etc. The rotating electric machine 5 described above can be applied to compressors 100 that use a wide variety of refrigerants, thereby achieving an effect of improving insulation reliability.

[0089] The refrigeration cycle apparatus 200 according to the first embodiment includes the above-described compressor 100, an outdoor heat exchanger 104, a pressure reducer 105, and an indoor heat exchanger 106. This makes it possible to prevent operation stoppages due to an abnormality in the compressor 100, thereby improving the reliability of the refrigeration cycle apparatus 200.

[0090] 15 is a perspective view showing the relationship between the first interphase insulating paper 57 and the coils in the stator 5b of the rotary electric machine 5 according to embodiment 2. The following describes the configuration of the stator 5b of the rotary electric machine 5 according to embodiment 2, focusing on the differences from embodiment 1.

[0091] As shown in Fig. 15 , in the second embodiment, the circumferential length L1 (see Fig. 13 ) of the first interphase insulating paper 57 is equal to the circumferential length of one coil, and the circumferential length L2 (see Fig. 14 ) of the second interphase insulating paper 58 is equal to the circumferential length of one coil. For simplicity's sake, Fig. 15 shows only one coil 52c of the six coils 52a to 52f of the A-phase stator winding 52 shown in Fig. 8 , and a single sheet of first interphase insulating paper 57 covering the coil end (A-phase coil end 521) of this coil 52c. Similarly, for the other five coils 52a, 52b, 52d, 52e, and 52f (not shown), each coil is defined as having a single sheet of first interphase insulating paper 57 covering its coil end (A-phase coil end 521). Furthermore, for the six coils of the B-phase stator winding 53 (see FIG. 7), it is defined that one sheet of second interphase insulating paper 58 is arranged to cover each coil's coil end (B-phase coil end 531).

[0092] The first interphase insulating paper 57 has protrusions 57b that protrude beyond the center of the outer edge 57a at both ends of an outer edge 57a, which is the edge of the first interphase insulating paper 57 opposite the stator core 51. The second interphase insulating paper 58 also has protrusions 58b that protrude beyond the center of the outer edge 58a at both ends of an outer edge 58a, which is the edge of the second interphase insulating paper 58 opposite the stator core 51.

[0093] That is, in embodiment 2, first interphase insulating paper 57 has the same shape as in embodiment 1, except that circumferential length L1 (see FIG. 13) of first interphase insulating paper 57, i.e., the lengths of outer side 57a and inner side 57d, are short. Also, although not shown, in embodiment 2, second interphase insulating paper 58 has the same shape as in embodiment 2, except that circumferential length L2 (see FIG. 14) of second interphase insulating paper 58, i.e., the lengths of outer side 58a and inner side 58d, are short.

[0094] Next, the function of the first interphase insulating paper 57 and the second interphase insulating paper 58 in the stator 5b of the rotating electric machine 5 according to the second embodiment will be described. Each interphase insulating paper is disposed so as to cover one coil end of a phase located on either the inner or outer circumferential side. The ends of the interphase insulating paper covering one coil end tend to sag due to the absence of a supporting coil end. As described above, the interphase insulating paper according to the present disclosure is configured such that the protrusions 57b, 58b at both ends of the outer edges 57a, 58a protrude beyond the center of the outer edges 57a, 58a. Therefore, the second embodiment achieves the same effect as the first embodiment. That is, even if the ends of the outer edges 57a, 58a enter between the coil ends of radially adjacent phases during assembly of the stator 5b, the protrusions 57b, 58b facilitate insulation between the coil ends.

[0095] The number of coil ends covered by first interphase insulating paper 57 may be different from the number of coil ends covered by second interphase insulating paper 58 .

[0096] Third Embodiment The configuration of a stator 5b of a rotating electrical machine 5 according to a third embodiment will be described below, focusing on differences from the first embodiment, with reference to Figures 7, 9 and 10.

[0097] In the third embodiment, the thickness t1 of the first interphase insulating paper 57 and the second interphase insulating paper 58 arranged between the end coils of two different phases is formed to be thinner than the thickness t3 of the slot cell 55 arranged in the slot portion sp. Here, the first interphase insulating paper 57 and the second interphase insulating paper 58 are defined as having the same thickness t1 (for example, 0.3 mm), but they may have different thicknesses.

[0098] As described above, the stator 5b of the rotating electric machine 5 according to the third embodiment includes slot cells 55, which are insulating materials arranged between the stator core 51 and the stator windings 52, 53, and 54 inside each of the multiple slots sp. The thickness t1 of each of the one or more interphase insulating papers is thinner than the thickness t3 of the slot cells 55. Specifically, the thickness t1 of each of the one or more first interphase insulating papers 57 constituting the first interphase insulating portion In1 is thinner than the thickness t3 of the slot cells 55, and the thickness t1 of each of the one or more second interphase insulating papers 58 constituting the second interphase insulating portion In2 is also thinner than the thickness t3 of the slot cells 55.

[0099] This makes it easier for the interphase insulating paper (first interphase insulating paper 57, second interphase insulating paper 58) to be inserted between radially adjacent coil ends of different phases when assembling the stator 5b, compared to when the interphase insulating paper has the same thickness as the slot cells 55.

[0100] Fourth Embodiment The configuration of a stator 5b of a rotating electrical machine 5 according to a fourth embodiment will be described below with reference to Figures 7, 9 and 10, focusing on differences from the first embodiment.

[0101] In the fourth embodiment, the thickness t1 of the first interphase insulating paper 57 and the second interphase insulating paper 58 arranged between the end coils of two different phases is formed to be thinner than the thickness t4 of the wedge 56 arranged in the slot portion sp. Here, the first interphase insulating paper 57 and the second interphase insulating paper 58 are defined as having the same thickness t1 (for example, 0.3 mm), but they may have different thicknesses.

[0102] Furthermore, thickness t1 of first interphase insulating paper 57 and second interphase insulating paper 58 may be formed to be the thinnest compared to the thickness of any insulating member provided on stator 5b other than first interphase insulating paper 57 and second interphase insulating paper 58. In Figures 9 and 10, the insulating members provided on stator 5b other than first interphase insulating paper 57 and second interphase insulating paper 58 are slot cells 55 and wedges 56.

[0103] As described above, the stator 5b of the rotating electric machine 5 according to the fourth embodiment includes wedges 56, which are insulating materials, arranged on the inner periphery inside each of the multiple slots sp. The wedges 56 prevent the stator windings 52, 53, 54 from falling off toward the inner periphery of the stator core 51. The thickness t1 of each of the one or more interphase insulating papers is thinner than the thickness t4 of the wedge 56. Specifically, the thickness t1 of each of the one or more first interphase insulating papers 57 constituting the first interphase insulator In1 is thinner than the thickness t4 of the wedge 56, and the thickness t1 of each of the one or more second interphase insulating papers 58 constituting the second interphase insulator In2 is also thinner than the thickness t4 of the wedge 56.

[0104] This makes it easier for the interphase insulating paper (first interphase insulating paper 57, second interphase insulating paper 58) to be inserted between radially adjacent coil ends of different phases when assembling the stator 5b, compared to when the interphase insulating paper has the same thickness as the wedge 56.

[0105] Fifth Embodiment Fig. 16 is a cross-sectional view from one axial direction showing the relationship between the interphase insulating paper and the coils in a stator 5b of a rotating electric machine 5 according to a fifth embodiment. In Fig. 16, for ease of explanation, the diagonal lines that represent the cross sections of some of the coils are omitted. Also, in Fig. 16, for ease of explanation, only one of the one or more interphase insulating papers that make up each interphase insulator is shown. Below, the configuration of the stator 5b of the rotating electric machine 5 according to the fifth embodiment will be described, focusing on the differences from the first embodiment.

[0106] As shown in Fig. 16, the stator 5b of the fifth embodiment has a slot number s of 24 and a coil pitch of 2. Here, the coil pitch refers to the number of slots arranged between the slots in which the windings of each coil are arranged. In the present embodiment, as in the first embodiment, the number of poles p and the number of slots s satisfy the relationship s = 3p, and the number of coils in the stator winding of each phase is s / 3.

[0107] The first interphase insulating paper 57 in embodiment 5 is arranged to cover two A-phase coil ends 521, as in embodiment 1. However, whereas the first interphase insulating paper 57 is arranged at 120 degrees in embodiment 1, the first interphase insulating paper 57 is arranged at 90 degrees in embodiment 5.

[0108] Also, second interphase insulating paper 58 in embodiment 5 is provided to cover two B-phase coil ends 531, as in embodiment 1. However, while second interphase insulating paper 58 was arranged at 120 degrees in embodiment 1, second interphase insulating paper 58 in embodiment 5 is arranged at 90 degrees.

[0109] As in the second embodiment, first interphase insulating paper 57 may be provided to cover one A-phase coil end 521, and second interphase insulating paper 58 may be provided to cover one B-phase coil end 531. In this case, first interphase insulating paper 57 and second interphase insulating paper 58 are arranged at a 45-degree angle.

[0110] In embodiment 5, first interphase insulating paper 57 has the same shape as in embodiment 1, except that circumferential length L1 (see FIG. 13) of first interphase insulating paper 57, i.e., the lengths of outer side 57a and inner side 57d, is different from that in embodiment 1. Also, in embodiment 5, second interphase insulating paper 58 has the same shape as in embodiment 1, except that circumferential length L2 (see FIG. 14) of second interphase insulating paper 58, i.e., the lengths of outer side 58a and inner side 58d, is different from that in embodiment 1.

[0111] That is, in the fifth embodiment as well, the interphase insulating paper has protrusions 57b, 58b at both ends of the outer edges 57a, 58a that protrude further than the centers of the outer edges 57a, 58a. Therefore, although the number of slots s and the number of poles p differ between the fifth embodiment and the first and second embodiments, the fifth embodiment also achieves the same effect of ensuring insulation between the coil ends as the first and second embodiments.

[0112] Sixth Embodiment Fig. 17 is a cross-sectional view from one axial direction showing the relationship between the interphase insulating paper and the coils in a stator 5b of a rotating electric machine 5 according to a sixth embodiment. In Fig. 17, for ease of explanation, the diagonal lines that represent the cross sections of some of the coils are omitted. Also, in Fig. 17, for ease of explanation, only one of the one or more interphase insulating papers that make up each interphase insulator is shown. Below, the configuration of the stator 5b of the rotating electric machine 5 according to the sixth embodiment will be described, focusing on the differences from the second embodiment.

[0113] 17, the stator 5b of the sixth embodiment has s=24 and a coil pitch of 4. In the present embodiment, as in the second embodiment, the number of poles p and the number of slots s satisfy the relationship s=3p, and the number of coils in the stator winding of each phase is s / 3.

[0114] The first interphase insulating paper 57 in embodiment 6 is arranged to cover one A-phase coil end 521, as in embodiment 2. However, whereas the first interphase insulating paper 57 is arranged at 60 degrees in embodiment 2, the first interphase insulating paper 57 is arranged at 90 degrees in embodiment 6.

[0115] Also, second interphase insulating paper 58 in embodiment 5 is provided to cover one B-phase coil end 531, as in embodiment 2. However, while second interphase insulating paper 58 was arranged at 60 degrees in embodiment 2, second interphase insulating paper 58 in embodiment 6 is arranged at 90 degrees.

[0116] As in the first embodiment, the first interphase insulating paper 57 may be provided to cover two A-phase coil ends 521, and the second interphase insulating paper 58 may be provided to cover two B-phase coil ends 531. In this case, the first interphase insulating paper 57 and the second interphase insulating paper 58 are arranged at 180 degrees.

[0117] In embodiment 6, first interphase insulating paper 57 has the same shape as in embodiment 2, except that circumferential length L1 (see FIG. 13) of first interphase insulating paper 57, i.e., the lengths of outer side 57a and inner side 57d, is different from that in embodiment 2. Also, in embodiment 6, second interphase insulating paper 58 has the same shape as in embodiment 2, except that circumferential length L2 (see FIG. 14) of second interphase insulating paper 58, i.e., the lengths of outer side 58a and inner side 58d, is different from that in embodiment 2.

[0118] That is, in the sixth embodiment as well, the interphase insulating paper has protrusions 57b, 58b at both ends of the outer edges 57a, 58a that protrude further than the centers of the outer edges 57a, 58a. Therefore, although the number of slots s and the number of poles p differ between the sixth embodiment and the first and second embodiments, the sixth embodiment also achieves the same effect of ensuring insulation between the coil ends as the first and second embodiments.

[0119] 1 Fixed scroll, 1a Base plate portion, 1b Plate-shaped spiral tooth, 1c Oldham guide groove, 1d Discharge port, 1e Suction port, 1f Compression chamber, 1g Suction check valve, 2 Swing scroll, 2a Base plate portion, 2b Plate-shaped spiral tooth, 2c Oldham guide groove, 2d Boss portion, 2e Swing bearing, 2f Thrust surface, 2g Bleed hole, 2k Base plate outer peripheral space, 2n Boss portion outer space, 3 Compliant frame, 3a Thrust bearing, 3c Main bearing, 3d Auxiliary main bearing, 3e Communication hole, 3f Communication hole, 3g Intermediate pressure adjustment valve, 3h Intermediate pressure adjustment valve holder, 3k Intermediate pressure adjustment spring, 3n Intermediate pressure adjustment valve space, 3p Upper cylindrical surface, 3s Lower cylindrical surface, 3t Thrust bearing opening, 4 Guide frame, 4a Frame upper space, 4b Frame lower space, 4c Upper cylindrical surface, 4d lower cylindrical surface, 4f first passage, 4g first discharge passage, 5 rotating electrical machine, 5a rotor, 5b stator, 5f through passage, 5g second passage, 5h lead wire, 6 main shaft, 6a eccentric shaft portion, 6b main shaft portion, 6c counter shaft portion, 6d oil supply passage, 6e oil supply port, 6f main shaft balance weight, 6g oil supply hole, 7a ring-shaped seal material, 7b ring-shaped seal material, 8 subframe, 8a counter bearing, 8b inlet hole, 9 Oldham mechanism, 9a fixed side key, 9b swing side key, 9c Oldham mechanism annular portion, 10 sealed container, 10a upper space, 10b oil reservoir portion, 10c glass terminal, 11 refrigerating machine oil, 12 discharge pipe, 13 suction pipe, 14 compression mechanism portion, 15a first balance weight, 15b Second balance weight, 16 Discharge cover, 16a Second discharge passage, 16b Opening, 17 First cup-shaped member, 17a Opening, 18 Second cup-shaped member, 30 Refrigerant flow path, 51 Stator core, 51a Core back portion, 51b Teeth portion, 52 Stator winding, 52a Coil, 52b Coil, 52c Coil, 52d Coil, 52e Coil, 52f Coil, 53 Stator winding, 54 Stator winding, 55 Slot cell, 56 Wedge, 57 First interphase insulating paper, 57a Outer side, 57b Protrusion, 57c First R-chamfered portion, 57d Inner side, 57e Second R-chamfered portion, 58 Second interphase insulating paper, 58a Outer side, 58b Protrusion, 58c First R-chamfered portion, 58d Inner side, 58e Second R-chamfered portion, 100 compressor, 101 intake muffler, 103 four-way switching valve,104 Outdoor heat exchanger, 105 Pressure reducer, 106 Indoor heat exchanger, 200 Refrigeration cycle device, 521 A-phase coil end, 531 B-phase coil end, 541 C-phase coil end, In1 First interphase insulation portion, In2 Second interphase insulation portion, First R chamfered portion, p Number of poles, s Number of slots, sp Slot portion, t1 Thickness, t3 Thickness, t4 Thickness.

Claims

1. A stator for a rotating electric machine comprising: a cylindrical stator core having a plurality of slots formed in the circumferential direction; two-phase or three-phase stator windings arranged so as to be stacked on top of each other in the radial direction of the stator core, each having a plurality of coils arranged in the circumferential direction of the stator core, the coil ends of the plurality of coils protruding axially from the stator core; and one or two interphase insulation parts arranged between the coil ends of the stator windings of each of two radially adjacent phases in the two-phase or three-phase stator winding, wherein each of the one or two interphase insulation parts is arranged corresponding to the plurality of coils of the stator winding of a phase arranged on the inner or outer peripheral side, and is made of one or more sheets of interphase insulation paper provided so as to cover the coil ends of one or more coils in the circumferential direction on a coil-by-coil basis, and each of the one or more sheets of interphase insulation paper constituting one or more of the one or two interphase insulation parts has protrusions at both ends of an outer edge that protrude beyond the center of the outer edge, which is the edge opposite the stator core.

2. The stator of a rotating electric machine according to claim 1, wherein the two-phase or three-phase stator winding is a three-phase stator winding, and the stator core and the three-phase stator winding have a number of poles p and a number of slots s that satisfy s = 3p, and the number of coils in the stator winding of each phase is s / 3, and the interphase insulation of 1 or 2 is the interphase insulation of 2, and when the phases of the three-phase stator winding are defined as A-phase, B-phase, and C-phase, the interphase insulation of 2 is a first interphase insulation made up of one or more sheets of first interphase insulating paper arranged in the circumferential direction and arranged between the coil end of the stator winding of A-phase and the coil end of the stator winding of B-phase, and a second interphase insulation made up of one or more sheets of second interphase insulating paper arranged in the circumferential direction and arranged between the coil end of the stator winding of B-phase and the coil end of the stator winding of C-phase.

3. A stator for a rotating electric machine according to claim 1 or claim 2, wherein a first R-chamfered portion is formed at the tip of the protrusion, and a second R-chamfered portion is formed at both corners of the inner side, which is the side facing the stator core, of each of the one or more sheets of interphase insulating paper constituting one or more of the one or two interphase insulating portions, and the arc radius of the first R-chamfered portion is formed smaller than the arc radius of the second R-chamfered portion.

4. A stator for a rotating electric machine according to any one of claims 1 to 3, comprising slot cells which are insulating material arranged between the stator core and the stator winding inside each of the plurality of slot portions, and wherein the thickness of each of the one or more sheets of interphase insulating paper is thinner than the thickness of the slot cells.

5. A stator for a rotating electric machine according to any one of claims 1 to 4, further comprising a wedge made of insulating material that is arranged on the inner periphery inside each of the plurality of slots and prevents the stator winding from falling off to the inner periphery of the stator core, and the thickness of each of the one or more sheets of interphase insulating paper is thinner than the thickness of the wedge.

6. A stator for a rotating electric machine according to any one of claims 1 to 5, wherein the coil ends of the plurality of coils in each of the two-phase or three-phase stator windings widen radially outward from the stator core toward the tip.

7. A rotating electric machine comprising: a rotating electric machine stator according to any one of claims 1 to 6; and a rotor provided inside the stator and rotated by magnetic action.

8. A compressor comprising: a rotating electric machine according to claim 7; a compression mechanism unit driven by said rotating electric machine and compressing refrigerant drawn in from the outside; and a sealed container accommodating said rotating electric machine and said compression mechanism unit.

9. The compressor according to claim 8, wherein the refrigerant is any one of R1234yf, R1234ze, R32, and R290 alone, or a mixture of two or more of these, or a mixture of any one of these with another refrigerant, or a mixture containing R1132(E), or a mixture containing R1123.

10. A refrigeration cycle device comprising the compressor according to claim 8 or 9, an outdoor heat exchanger, a pressure reducer, and an indoor heat exchanger.

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