Stator, rotating electric machine, compressor and refrigeration cycle device

Abstract

A stator according to the present disclosure is used for a three-phase rotary electric machine, and a stator winding of the same phase has a structure in which two coils are inserted in the same slot portion among slot portions formed in a core back portion of a stator core. When one of the coils inserted in the same slot portion is designated as a first coil and the other one of the coils inserted in the same slot portion is designated as a second coil, the first coil is disposed on an outer peripheral side of the second coil from the stator core in the slot portion. When a value obtained by dividing the number of aluminum wires in the first coil by the number of copper wires in the first coil is a first ratio and a value obtained by dividing the number of aluminum wires in the second coil by the number of copper wires in the second coil is a second ratio, the first ratio and the second ratio are the same.

Description

[Technical Field]

[0001] The present disclosure relates to a stator having a stator winding partially using aluminum wire, a rotating electric machine having the stator, a compressor having the rotating electric machine, and a refrigeration cycle device having the compressor. [Background technology]

[0002] Conventionally, copper wires have been used for the stator windings of the stators of rotating electric machines. However, in recent years, the demand for copper has increased, causing the price of copper to soar, and the cost of rotating electric machines has become high. For this reason, in recent years, stators for rotating electric machines have been proposed that use copper wires and aluminum wires for the stator windings in order to reduce costs (see Patent Document 1).

[0003] Here, aluminum wire has a higher electrical resistivity than copper wire, and therefore generates a larger amount of heat when current is applied. For this reason, when copper wire and aluminum wire are used in the stator winding, it is necessary to improve the heat dissipation effect. Therefore, in conventional stators using copper wire and aluminum wire in the stator winding, the stator winding is configured so that the aluminum wire is densely packed in one place within the slot portion. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2019 / 163021 Summary of the Invention [Problem to be solved by the invention]

[0005] As described above, in conventional stators using copper wires and aluminum wires for the stator windings, the aluminum wires are densely packed in one location within the slots. Therefore, in conventional stators using copper wires and aluminum wires for the stator windings, heat generation increases in the location where the aluminum wires are densely packed, resulting in high resistance of the aluminum wires. As a result, conventional stators using copper wires and aluminum wires for the stator windings have the problem of increased stator loss and reduced efficiency of the rotating electric machine.

[0006] The present disclosure has been made to solve the above-mentioned problems, and has a first object to provide a stator that uses copper wire and aluminum wire for the stator winding and that can suppress a decrease in efficiency of a rotating electric machine more than conventional methods. The second object of the present disclosure is to provide a rotating electric machine including such a stator, a compressor including the rotating electric machine, and a refrigeration cycle device including the compressor. [Means for solving the problem]

[0007] The stator according to the present disclosure is a stator for a three-phase rotating electric machine, the stator comprising: a stator core having a cylindrical core back portion and a plurality of teeth protruding from the core back portion to the inner circumferential side of the core back portion, with slots formed between the core back portion and the adjacent teeth portion; and a stator winding wound around the stator core, wherein, where p is the number of poles and s is the number of slots, s=3p is satisfied, and the stator winding is provided for each of the phases, and each of the stator windings comprises a plurality of coils (s / 3 in number) inserted into the slots across a specified number of the teeth, and each of the coils comprises copper wire and aluminum wire, and the stator core is wound around the stator core in a manner such that p is the number of poles and s is the number of slots. The stator winding has a configuration in which two of the coils are inserted into the same slot portion, and when one of the coils inserted into the same slot portion is designated as a first coil and the other of the coils inserted into the same slot portion is designated as a second coil, the first coil is positioned closer to the outer periphery of the stator core than the second coil within the slot portion, and when a first ratio is defined as the number of copper wires in the first coil divided by the number of aluminum wires in the first coil and a second ratio is defined as the number of copper wires in the second coil divided by the number of aluminum wires in the second coil, the first ratio and the second ratio are the same.

[0008] A rotating electric machine according to the present disclosure includes a stator according to the present disclosure and a rotor rotatably provided on the inner circumferential side of the stator.

[0009] A compressor according to the present disclosure includes the rotating electric machine according to the present disclosure and a compression mechanism that compresses a refrigerant by the driving force of the rotating electric machine.

[0010] In addition, the refrigeration cycle device according to the present disclosure includes a compressor according to the present disclosure, a radiator in which the refrigerant compressed by the compressor radiates heat, a pressure reducer that reduces the pressure of the refrigerant flowing out of the radiator, and an evaporator in which the refrigerant flowing out of the pressure reducer evaporates. [Effects of the Invention]

[0011] The stator according to the present disclosure can prevent aluminum wires from becoming denser in the slots than conventional stators, and therefore, compared to conventional stators that use copper wires and aluminum wires for the stator windings, the stator according to the present disclosure can prevent local temperature increases in the slots, thereby preventing a decrease in the efficiency of the rotating electric machine. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a vertical cross-sectional view of a scroll compressor according to a first embodiment of the present invention. [Figure 2] 2 is a view showing a guide frame and a sealed container of the scroll compressor according to the first embodiment. FIG. [Figure 3] 1 is a vertical cross-sectional view showing a rotor of a scroll compressor according to a first embodiment of the present invention. [Figure 4] 1 is a cross-sectional view showing a rotor of a scroll compressor according to a first embodiment of the present invention. [Figure 5] 2 is a diagram showing a stator and a sealed container of the scroll compressor according to the first embodiment. FIG. [Figure 6] 1 is a schematic configuration diagram showing a refrigeration cycle device according to a first embodiment of the present invention. [Figure 7] FIG. 2 is a plan view showing the stator according to the first embodiment. [Figure 8] 3 is a plan view showing a stator core and an A-phase stator winding of the stator according to the first embodiment. FIG. [Figure 9] FIG. 2 is a side view of the stator according to the first embodiment, with a portion shown in cross section. [Figure 10] FIG. 3 is a cross-sectional view showing the periphery of a slot portion of the stator according to the first embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0013] In the following embodiments, examples of a stator, a rotating electric machine, a compressor, and a refrigeration cycle device according to the present disclosure will be described. Note that the stator, the rotating electric machine, the compressor, and the refrigeration cycle device according to the present disclosure are not limited to the configurations shown in the following embodiments. For example, in the following embodiments, a vertical scroll compressor is described as an example of a compressor according to the present disclosure. However, the compressor according to the present disclosure may also be, for example, a horizontal scroll compressor. Furthermore, the compressor according to the present disclosure may be a compressor having a compression mechanism other than a scroll type as long as it includes a compression mechanism that compresses a refrigerant using the driving force of the rotating electric machine according to the present disclosure. Furthermore, the drawings shown in the following embodiments are schematic representations of examples of a stator, a rotating electric machine, a compressor, and a refrigeration cycle device according to the present disclosure. Therefore, the sizes of the components shown in the drawings in the following embodiments may differ from those of the stator, the rotating electric machine, the compressor, and the refrigeration cycle device according to the present disclosure that are actually manufactured.

[0014] Embodiment 1 Fig. 1 is a vertical cross-sectional view of a scroll compressor according to Embodiment 1. The configuration and operation of a vertical scroll compressor 100 will be described with reference to Fig. 1. The scroll compressor 100 is, for example, one component of a refrigeration cycle device. Refrigeration cycle devices are used in various industrial machines such as refrigerators, freezers, air conditioners, refrigeration systems, and water heaters.

[0015] The scroll compressor 100 draws in a refrigerant circulating through a refrigeration cycle device, compresses it, and discharges it in a high-temperature, high-pressure state. The scroll compressor 100 includes a compression mechanism 14 in a sealed container 10. The compression mechanism 14 compresses the refrigerant using the driving force of a rotating electric machine 5, which will be described later. In the first embodiment, the compression mechanism 14 is configured by combining a fixed scroll 1 and an orbiting scroll 2 that orbits relative to the fixed scroll 1. The scroll compressor 100 also includes a rotating electric machine 5 in the sealed container 10. The rotating electric machine 5 is connected to the orbiting scroll 2 by a main shaft 6 and drives the orbiting scroll 2. In the case of a vertically mounted scroll compressor 100, for example, the compression mechanism 14 is arranged on the upper side and the rotating electric machine 5 is arranged on the lower side within the sealed container 10.

[0016] The fixed scroll 1 includes a base plate 1a and plate-shaped spiral teeth 1b provided on one surface of the base plate 1a. The plate-shaped spiral teeth 1b are spiral protrusions and are provided on the lower surface of the base plate 1a in FIG. 1. The orbiting scroll 2 includes a base plate 2a and plate-shaped spiral teeth 2b provided on one surface of the base plate 2a. The plate-shaped spiral teeth 2b are spiral protrusions having substantially the same shape as the plate-shaped spiral teeth 1b and are provided on the upper surface of the base plate 2a in FIG. 1. The plate-shaped spiral teeth 1b of the fixed scroll 1 and the plate-shaped spiral teeth 2b of the orbiting scroll 2 are meshed with each other to form a compression chamber 1f between the plate-shaped spiral teeth 1b and the plate-shaped spiral teeth 2b, the volume of which changes as the orbiting scroll 2 swings.

[0017] The fixed scroll 1 is fixed to a guide frame 4. For example, the outer periphery of the fixed scroll 1 is fastened to the guide frame 4 with bolts. A suction pipe 13 is provided on the outer periphery of a base plate 1a of the fixed scroll 1, for introducing refrigerant gas from a suction port 1e into a compression chamber 1f via a suction check valve 1g. A discharge port 1d is formed in the center of the base plate 1a of the fixed scroll 1, for discharging the compressed, high-pressure refrigerant gas. The compressed, high-pressure refrigerant gas is discharged into an upper space 10a in a sealed container 10. The refrigerant gas discharged into the upper space 10a flows through a refrigerant flow path (described later) and is discharged from a discharge pipe 12.

[0018] The orbiting scroll 2 is oscillated relative to the fixed scroll 1 without rotating on its axis by an Oldham mechanism 9 that prevents rotation 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 inserted into 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 groove 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. A pair of orbiting-side keys 9b of the Oldham mechanism 9 are inserted into these Oldham guide grooves 2c so as to be able to slide back and forth.

[0019] The Oldham mechanism 9 configured as described above enables the orbiting scroll 2 to perform an orbiting motion without rotating on its axis. A hollow cylindrical boss 2d is provided at the center of the surface of the base plate 2a of the orbiting scroll 2 opposite the surface on which the plate-shaped spiral teeth 2b are formed. In FIG. 1 , the surface of the base plate 2a opposite the surface on which the plate-shaped spiral teeth 2b are formed is the underside of the base plate 2a. An eccentric shaft 6a provided at the upper end of the main shaft 6 is inserted into this boss 2d. A thrust surface 2f that can slide and press against the thrust bearing 3a of the compliant frame 3 is formed on the surface of the base plate 2a of the orbiting scroll 2 opposite the surface on which the plate-shaped spiral teeth 2b are formed. A bleed hole 2g that connects the compression chamber 1f and the thrust surface 2f is formed in the base plate 2a of the orbiting scroll 2. The bleed hole 2g extracts refrigerant gas during compression and guides it to the thrust surface 2f.

[0020] 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 with an upper cylindrical surface 4c into which the upper cylindrical surface 3p of the compliant frame 3 fits, and a lower cylindrical surface 4d into which the lower cylindrical surface 3s of the compliant frame 3 fits. The compliant frame 3 is radially supported 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 they radially support a main shaft 6 that is rotationally driven by a rotor 5a of a rotating electrical machine 5. The compliant frame 3 also has a communication hole 3e that penetrates from the thrust bearing 3a to the outer periphery of the compliant frame 3. The communication hole 3e penetrates the compliant frame 3, for example, in the direction of the central axis of the main shaft 6. A thrust bearing opening 3t, which is an opening of the communication hole 3e on the thrust bearing 3a side, is arranged opposite the bleed hole 2g that penetrates the base plate portion 2a of the orbiting scroll 2.

[0021] Furthermore, a reciprocating sliding surface 3b, which is the surface along which the Oldham mechanism annular portion 9c reciprocates and slides, is formed on the outer periphery of the thrust bearing 3a of the compliant frame 3. The compliant frame 3 also has a communication hole 3f that connects the base plate outer periphery space 2k with the frame upper space 4a, and communicates with the inside of the Oldham mechanism annular portion 9c. Furthermore, the compliant frame 3 has an intermediate pressure adjustment valve space 3n between the frame upper space 4a and the boss outer space 2n, which houses an intermediate pressure adjustment valve 3g that adjusts the pressure in the boss outer space 2n, an intermediate pressure adjustment valve holder 3h, and an intermediate pressure adjustment spring 3k. The intermediate pressure adjustment spring 3k is shortened from its natural length and housed in the intermediate pressure adjustment valve space 3n. In the first embodiment, the compliant frame 3 and the guide frame 4 are configured as separate bodies, but this is not limiting, and the compliant frame 3 and the guide frame 4 may be integrated into a single 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 at the top and bottom by the ring-shaped seals 7a and 7b. In the first embodiment, the outer peripheral surface of the compliant frame 3 is formed with a ring-shaped seal groove for accommodating the ring-shaped seal 7a and a ring-shaped seal groove for accommodating the ring-shaped seal 7b. However, at least one of these seal grooves may be formed on the inner peripheral surface of the guide frame 4. The frame lower space 4b communicates only with the communication hole 3e of the compliant frame 3 and is configured to seal in the refrigerant gas being compressed and supplied through the bleed hole 2g. The space on the outer periphery of the thrust bearing 3a, which is surrounded at the top and bottom by the base plate 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 containing the intake gas atmosphere.

[0023] Fig. 2 is a diagram showing a guide frame and a sealed container of the scroll compressor according to Embodiment 1. Fig. 2 is a diagram showing the guide frame 4 and the sealed container 10 in a cross section of the scroll compressor 100 shown in Fig. 1 cut at the position of the guide frame 4. The guide frame 4 is fixed to the sealed container 10 by shrink fitting, welding, or the like so that the outer circumferential surface of the guide frame 4 contacts the inner circumferential surface of the sealed container 10. As shown in Figs. 1 and 2, the guide frame 4 is cut out at the outer circumferential portions of the guide frame 4 and the fixed scroll 1, in other words, at the outer circumferential portion of the compression mechanism 14, to form a first passage 4f. The refrigerant gas discharged from the discharge port 1d into the upper space 10a of the sealed container 10 flows downward in the sealed container 10 through the first passage 4f. The bottom of the sealed container 10 forms an oil reservoir 10b in which refrigeration oil 11 is stored.

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

[0025] The rotating electric machine 5 rotates the main shaft 6 and includes a stator 5b and a rotor 5a. The stator 5b is approximately cylindrical and is fixed to the sealed container 10 by shrink fitting or the like. The rotor 5a is approximately cylindrical and is fixed to the main shaft 6 by shrink fitting or the like. The rotor 5a is rotatably provided on the inner periphery of the stator 5b. Specifically, the rotor 5a is driven to rotate by starting to pass current through the stator 5b. This causes the main shaft 6 to rotate together with the rotor 5a. The main shaft 6 includes, at its upper end, an eccentric shaft portion 6a rotatably inserted in a swing bearing 2e provided on a boss portion 2d of the swing scroll 2. A balance weight 6f is fixed to the lower side of the eccentric shaft portion 6a by shrink fitting or the like.

[0026] Furthermore, the main shaft 6 is provided with a main shaft portion 6b below the eccentric shaft portion 6a, which is rotatably inserted into the main bearing 3c and auxiliary main bearing 3d of the compliant frame 3. The main shaft 6 is also provided with a counter shaft portion 6c at its lower end, which is rotatably inserted into the counter bearing 8a of the subframe 8. The subframe 8 is formed with an inlet hole 8b through which refrigeration oil 11 flows into the oil reservoir 10b. The rotor 5a of the rotating electrical machine 5 is fixed to the main shaft 6 between the counter shaft portion 6c and the main shaft portion 6b. The main shaft 6 is formed with an oil supply passage 6d, which is a hole that penetrates in the axial direction. An oil supply port 6e at the lower end of the oil supply passage 6d is immersed in refrigeration oil 11 stored at the bottom of the sealed container 10. Therefore, refrigeration oil 11 is sucked up from the oil supply port 6e into the oil supply passage 6d 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. Therefore, a portion of the refrigeration oil 11 sucked up into the oil supply passage 6d flows out from the opening at the upper end of the oil supply passage 6d to the rocking bearing 2e, lubricating the eccentric shaft portion 6a and the rocking bearing 2e. In addition, an oil supply hole 6g branching in the horizontal direction is formed in the oil supply passage 6d. A portion of the refrigeration oil 11 sucked up into the oil supply passage 6d is supplied from this oil supply hole 6g to the auxiliary main bearing 3d, lubricating the auxiliary main bearing 3d and the main shaft portion 6b. Note that the oil supply hole for the main bearing 3c is not shown in FIG. 1.

[0027] A balance weight 15a is fixed to the upper end surface of the rotor 5a, and a balance weight 15b is fixed to the lower end surface of the rotor 5a. The balance weights 15a and 15b are fixed at eccentric positions diagonally relative to the central axis of the rotor 5a. In addition, the aforementioned balance weight 6f is fixed to the lower part of the eccentric shaft portion 6a of the main shaft 6 in the space outside the boss portion 2d. These three balance weights 15a, 15b, and 6f offset the imbalance of centrifugal force and moment force caused by the swinging of the orbiting scroll 2 via the eccentric shaft portion 6a of the main shaft 6. This achieves static and dynamic balance between the main shaft 6, the rotor 5a, etc.

[0028] Furthermore, a first cup-shaped member 17 containing balance weight 15a is fixed to the upper end surface of rotor 5a, and a second cup-shaped member 18 containing balance weight 15b is fixed to the lower end surface of rotor 5a. First cup-shaped member 17 is provided on the upper end surface of rotor 5a so that its upper opening 17a faces opening 16b of discharge cover 16. Second cup-shaped member 18 is provided on the lower end surface of rotor 5a with its opening facing downward. First cup-shaped member 17 and second cup-shaped member 18 are preferably made of non-magnetic material.

[0029] Fig. 3 is a vertical cross-sectional view showing the rotor of the scroll compressor according to the embodiment 1. Fig. 4 is a horizontal cross-sectional view showing the rotor of the scroll compressor according to the embodiment 1. 3 and 4, the rotor 5a is formed with a plurality of through-flow passages 5f that penetrate the rotor 5a in the direction of its central axis. These through-flow passages 5f penetrate the bottoms of the first cup-shaped member 17 and the second cup-shaped member 18, avoiding the positions where the balance weights 15a and 15b are installed. Note that each through-flow passage 5f may be formed so as to penetrate the balance weights 15a and 15b, or may be formed so as to avoid the positions of the first cup-shaped member 17 and the second cup-shaped member 18. In the first embodiment, the plurality of through-flow passages 5f are formed symmetrically or point-symmetrically with respect to the central axis of the rotor 5a.

[0030] Fig. 5 is a diagram showing the stator and the sealed container of the scroll compressor according to the embodiment 1. Fig. 5 is a diagram showing the stator 5b and the sealed container 10 in a cross section of the scroll compressor 100 shown in Fig. 1 cut at the position of the stator 5b. The stator 5b of the rotary electric machine 5 is fixed to the sealed container 10 by shrink fitting, welding, or the like so that the outer circumferential surface of the stator 5b contacts the inner circumferential surface of the sealed container 10. As shown in Figs. 1 and 5, second passages 5g are formed in the stator 5b by notches. The first passage 4f and the second passage 5g described above constitute a refrigerant flow path 30 that guides the refrigerant gas discharged from the discharge port 1d to the bottom of the sealed container .

[0031] 1, a glass terminal 10c is provided on the side surface of the sealed container 10. 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 scroll compressor 100 according to the first embodiment will be described. When the scroll compressor 100 is started up or in operation, refrigerant gas is drawn into the suction pipe 13. The refrigerant gas 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. The refrigerant drawn into the compression chamber 1f becomes high-pressure during this compression stroke. During the compression stroke, intermediate-pressure refrigerant gas passes through the bleed hole 2g of the orbiting scroll 2 and the communication hole 3e of the compliant frame 3 and is guided to the frame lower space 4b, maintaining an intermediate-pressure atmosphere in the frame lower space 4b.

[0033] The mixed gas of refrigerant gas and refrigeration oil 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 the refrigerant flow path 30 and is guided to the space below the rotating electric machine 5, i.e., the bottom of the sealed container 10. The mixed gas is separated as it is guided to the bottom of the sealed container 10. The refrigerant gas separated from the refrigeration 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 the through-flow passage 5f provided in the rotor 5a. The refrigerant gas from which the refrigeration oil 11 has been separated then rises inside the first cup-shaped member 17 attached to the upper end surface of the rotor 5a and flows into the discharge cover 16. The refrigerant gas from which the refrigeration oil 11 has been separated then passes through the second discharge passage 16a in the discharge cover 16, the first discharge passage 4g, and the discharge pipe 12 before being released out of the sealed container 10.

[0034] Next, a refrigeration cycle device 200 including the scroll compressor 100 according to the first embodiment will be described.

[0035] FIG. 6 is a schematic configuration diagram showing the refrigeration cycle device according to the first embodiment. The refrigeration cycle device 200 includes a scroll compressor 100, a radiator in which the refrigerant compressed by the scroll compressor 100 radiates heat, a pressure reducer 105 such as an electric expansion valve that reduces the pressure of the refrigerant flowing out from the radiator, and an evaporator in which the refrigerant flowing out from the pressure reducer 105 evaporates.

[0036] The refrigeration cycle apparatus 200 is used for various purposes, such as a refrigerator, a freezer, an air conditioner, a refrigeration system, and a water heater. FIG. 6 shows an example in which the refrigeration cycle apparatus 200 is used as an air conditioner. For this purpose, the refrigeration cycle apparatus 200 shown in FIG. 6 includes an indoor heat exchanger 106 that functions as a radiator during heating operation and an outdoor heat exchanger 104 that functions as an evaporator during heating operation. The refrigeration cycle apparatus 200 shown in FIG. 6 is also capable of cooling operation. For this purpose, the refrigeration cycle apparatus 200 includes a four-way switching valve 103. The four-way switching valve 103 switches the heat exchanger connected to the discharge pipe 12, which is the refrigerant discharge port of the scroll compressor 100, and switches the heat exchanger connected to the suction pipe 13, which is the refrigerant intake port of the scroll compressor 100. During cooling operation, the indoor heat exchanger 106 functions as an evaporator, and the outdoor heat exchanger 104 functions as a radiator. The refrigeration cycle apparatus 200 according to the first embodiment includes an intake muffler 101 between the scroll compressor 100 and a heat exchanger serving as an evaporator.

[0037] When the refrigeration cycle apparatus 200 is used as an air conditioner, for example, the indoor heat exchanger 106 is mounted in an indoor device. Also, for example, the scroll compressor 100, the four-way switching valve 103, the outdoor heat exchanger 104, and the pressure reducer 105 are mounted in an outdoor device. Also, for example, the refrigeration cycle apparatus 200 uses an R407C refrigerant, an R410A refrigerant, an R32 refrigerant, or the like.

[0038] When the refrigeration cycle apparatus 200 performs heating operation, the four-way switching valve 103 switches to the flow path shown by the solid line in FIG. 6 . As a result, the discharge pipe 12 of the scroll compressor 100 is connected to the indoor heat exchanger 106, and the suction pipe 13 of the scroll compressor 100 is connected to the outdoor heat exchanger 104. That is, the indoor heat exchanger 106 functions as a radiator, and the outdoor heat exchanger 104 functions as an evaporator. In this state, when high-temperature, high-pressure refrigerant gas compressed by the scroll compressor 100 is discharged from the scroll compressor 100, this high-temperature, high-pressure refrigerant gas flows into the indoor heat exchanger 106. The high-temperature, high-pressure refrigerant gas that flows into the indoor heat exchanger 106 condenses while releasing heat to the indoor air, becoming a high-pressure liquid refrigerant and flowing out of the indoor heat exchanger 106. At this time, the indoor air is heated. Note that some types of refrigerants, such as carbon dioxide refrigerant, do not condense when radiating heat. When a refrigerant that condenses when radiating heat is used, the radiator may also be called a condenser.

[0039] The high-pressure liquid refrigerant flowing out from the indoor heat exchanger 106 flows into the pressure reducer 105. The high-pressure liquid refrigerant flowing into the pressure reducer 105 is reduced in pressure by the pressure reducer 105 to become a low-temperature, low-pressure two-phase gas-liquid refrigerant, which flows out from the pressure reducer 105. The low-temperature, low-pressure two-phase gas-liquid refrigerant flowing out from the pressure reducer 105 flows into the outdoor heat exchanger 104. The low-temperature, low-pressure two-phase gas-liquid refrigerant flowing into the outdoor heat exchanger 104 absorbs heat from the outdoor air, evaporates, and flows out from the outdoor heat exchanger 104 as low-pressure refrigerant gas. The low-pressure refrigerant gas flowing out from the outdoor heat exchanger 104 passes through the suction muffler 101 and is drawn into the scroll compressor 100. The low-pressure refrigerant gas drawn into the scroll compressor 100 is compressed by the scroll compressor 100 to become a high-temperature, high-pressure refrigerant gas. This high-temperature, high-pressure refrigerant gas is again discharged from the scroll compressor 100. That is, when the refrigeration cycle apparatus 200 performs heating operation, the refrigerant circulates as shown by the solid arrows in FIG.

[0040] When the refrigeration cycle apparatus 200 performs cooling operation, the four-way switching valve 103 switches to the flow path shown by the dashed line in FIG. 6 . As a result, the discharge pipe 12 of the scroll compressor 100 is connected to the outdoor heat exchanger 104, and the suction pipe 13 of the scroll compressor 100 is connected to the indoor heat exchanger 106. That is, the outdoor heat exchanger 104 functions as a radiator, and the indoor heat exchanger 106 functions as an evaporator. In this state, when high-temperature, high-pressure refrigerant gas compressed by the scroll compressor 100 is discharged from the scroll compressor 100, this high-temperature, high-pressure refrigerant gas flows into the outdoor heat exchanger 104. The high-temperature, high-pressure refrigerant gas that has flowed into the outdoor heat exchanger 104 condenses while releasing heat to the outdoor air, and flows out of the outdoor heat exchanger 104 as high-pressure liquid refrigerant.

[0041] The high-pressure liquid refrigerant flowing out from the outdoor heat exchanger 104 flows into the pressure reducer 105. The high-pressure liquid refrigerant flowing into the pressure reducer 105 is reduced in pressure by the pressure reducer 105 to become a low-temperature, low-pressure two-phase gas-liquid refrigerant, which flows out from the pressure reducer 105. The low-temperature, low-pressure two-phase gas-liquid refrigerant flowing out from the pressure reducer 105 flows into the indoor heat exchanger 106. The low-temperature, low-pressure two-phase gas-liquid refrigerant flowing into the indoor heat exchanger 106 absorbs heat from the indoor air, evaporates, and flows out from the indoor heat exchanger 106 as low-pressure refrigerant gas. At this time, the indoor air is cooled. The low-pressure refrigerant gas flowing out from the indoor heat exchanger 106 passes through the suction muffler 101 and is drawn into the scroll compressor 100. The low-pressure refrigerant gas drawn into the scroll compressor 100 is compressed by the scroll compressor 100 to become a high-temperature, high-pressure refrigerant gas. This high-temperature, high-pressure refrigerant gas is again discharged from the scroll compressor 100. That is, when the refrigeration cycle device 200 performs cooling operation, the refrigerant circulates as shown by the dashed arrows in FIG.

[0042] Next, a detailed configuration of the stator 5b of the rotary electric machine 5 according to the first embodiment will be described.

[0043] Fig. 7 is a plan view showing the stator according to the present embodiment 1. Fig. 7 can also be said to be a view of the stator 5b observed in the direction of the central axis of the stator 5b. The rotating electric machine 5 according to the first embodiment is a three-phase rotating electric machine. That is, the stator 5b is the stator of the three-phase rotating electric machine 5. The stator 5b includes a stator core 51 and a stator winding wound around the stator core 51.

[0044] The stator core 51 is manufactured by stacking multiple electromagnetic steel sheets in the central axis direction of the stator core 51. The stator core 51 includes a substantially cylindrical core back portion 51a and multiple teeth 51b protruding from the core back portion 51a toward the inner periphery of the core back portion 51a. The stator core 51 has slots 51c formed between the core back portion 51a and adjacent teeth 51b. The stator 5b according to the first embodiment has three times the number of slots 51c as the number of poles. In other words, if the number of poles of the stator 5b is p and the number of slots 51c is s, the stator 5b satisfies s = 3p. Note that FIG. 7 illustrates a stator 5b having six poles and eighteen slots 51c. However, as long as s = 3p is satisfied, the number of poles of the stator 5b is not limited to six, and the number of slots 51c of the stator 5b is not limited to eighteen.

[0045] A stator winding is provided for each phase. In other words, the stator 5b of the three-phase rotating electric machine 5 has a stator winding for each phase. Specifically, the stator 5b of the three-phase rotating electric machine 5 has three stator windings. Each of the stator windings has a plurality of coils inserted into the slots 51c across a specified number of teeth 51b. Specifically, each of the stator windings has s / 3 coils. In the example shown in FIG. 7, each of the stator windings has six coils. Each of the coils is inserted into the slots 51c across three teeth 51b.

[0046] In the following description, one of the three phases will be referred to as phase A. The other of the three phases will be referred to as phase B. The other of the three phases will be referred to as phase C. The stator winding for phase A will be referred to as stator winding 52. The stator winding for phase B will be referred to as stator winding 53. The stator winding for phase C will be referred to as stator winding 54. When each coil of the stator winding 52 is to be distinguished, it will be indicated by adding an alphabetical character to the reference numeral 52. Specifically, in the example shown in FIG. 7, the stator winding 52 has six coils. Therefore, the coils of the stator winding 52 are coil 52a, coil 52b, coil 52c, coil 52d, coil 52e, or coil 52f. Similarly, when each coil of the stator winding 53 is to be distinguished, it will be indicated by adding an alphabetical character to the reference numeral 53. Specifically, in the example shown in FIG. 7, the stator winding 53 has six coils. Therefore, the coils of the stator winding 53 are coils 53a, 53b, 53c, 53d, 53e, or 53f. Similarly, when each coil of the stator winding 54 is to be distinguished, it is indicated by adding an alphabet to the reference numeral 54. Specifically, in the example shown in FIG. 7, the stator winding 54 has six coils. Therefore, the coils of the stator winding 54 are coils 54a, 54b, 54c, 54d, 54e, or 54f. Hereinafter, the method of winding the stator winding around the stator core 51 will be described in more detail with reference to FIG.

[0047] FIG. 8 is a plan view showing the stator core and the A-phase stator winding of the stator according to the first embodiment. As described above, each coil of the stator winding 52 is inserted into the slot 51c across three teeth 51b. In this case, coil 52b is inserted into the slot 51c into which coil 52a is inserted and into the slot 51c into which coil 52c is inserted. Furthermore, coil 52d is inserted into the slot 51c into which coil 52c is inserted and into the slot 51c into which coil 52e is inserted. Furthermore, coil 52f is inserted into the slot 51c into which coil 52e is inserted and into the slot 51c into which coil 52a is inserted. With the coils of the stator winding 52 inserted into the slots 51c in this manner, when the stator winding 52 is observed in the direction of the central axis of the stator 5b, as shown in FIG. 7, the stator winding 52 is wound around the stator core 51 in a substantially circular shape.

[0048] As described above, in the stator 5b according to the first embodiment, the stator winding of the same phase has two coils inserted into the same slot 51c. Hereinafter, one of the coils inserted into the same slot 51c may be referred to as a first coil 71, and the other of the coils inserted into the same slot 51c may be referred to as a second coil 72. Specifically, the first coil 71 is a coil that is disposed closer to the outer periphery of the stator core 51 than the second coil 72 within the slot 51c. In the stator winding 52 that is the A-phase stator winding, the coils 52a, 52c, and 52e are the first coil 71. In the stator winding 52, the coils 52b, 52d, and 52f are the second coil 72.

[0049] Like the coils of the stator winding 52, each of the coils of the stator winding 53 is inserted into a slot 51c into which no coil of the stator winding 52 is inserted. More specifically, coil 53b is inserted into the slot 51c into which coil 53a is inserted and the slot 51c into which coil 53c is inserted. Coil 53d is inserted into the slot 51c into which coil 53c is inserted and the slot 51c into which coil 53e is inserted. Coil 53f is inserted into the slot 51c into which coil 53e is inserted and the slot 51c into which coil 53a is inserted. That is, in the stator winding 53, which is the B-phase stator winding, coils 53a, 53c, and 53e form the first coil 71. In the stator winding 53, coils 53b, 53d, and 53f form the second coil 72.

[0050] With each coil of the stator winding 53 inserted into the slot 51c in this manner, when the stator winding 53 is observed in the direction of the central axis of the stator 5b, as shown in Fig. 7, the stator winding 53 is wound in a substantially circular shape around the stator core 51. Here, each coil of the stator winding 52 is inserted into the slot 51c, and then each coil of the stator winding 53 is inserted into the slot 51c. Therefore, as shown in Fig. 7, the stator winding 53 is disposed on the inner circumferential side of the stator winding 52.

[0051] Like the coils of the stator windings 52 and 53, each of the coils of the stator winding 54 is inserted into a slot 51c into which no coil of the stator winding 52 or 53 is inserted. More specifically, coil 54b is inserted into the slot 51c into which coil 54a is inserted and the slot 51c into which coil 54c is inserted. Coil 54d is inserted into the slot 51c into which coil 54c is inserted and the slot 51c into which coil 54e is inserted. Coil 54f is inserted into the slot 51c into which coil 54e is inserted and the slot 51c into which coil 54a is inserted. That is, in the stator winding 54, which is the C-phase stator winding, coils 54a, 54c, and 54e form the first coil 71. In the stator winding 54, the coils 54b, 54d, and 54f form the second coils 72.

[0052] With each coil of the stator winding 54 inserted into the slot 51c in this manner, when the stator winding 54 is observed in the direction of the central axis of the stator 5b, as shown in Fig. 7, the stator winding 54 is wound in a substantially circular shape around the stator core 51. Here, each coil of the stator winding 52 and the stator winding 53 is inserted into the slot 51c, and then each coil of the stator winding 54 is inserted into the slot 51c. Therefore, as shown in Fig. 7, the stator winding 54 is disposed on the inner circumferential side of the stator windings 52 and 53.

[0053] Fig. 9 is a side view of the stator according to the present embodiment 1, showing a part in cross section. Specifically, Fig. 9 shows the right side of the stator 5b in cross section. Each of the coils of the stator windings has a coil end, which is a portion that protrudes from the stator core 51 in the direction of the central axis of the stator core 51. As described above, after each coil of the stator winding 52 is inserted into the slot 51c, each coil of the stator winding 53 is inserted into the slot 51c. Furthermore, after each coil of the stator windings 52 and 53 is inserted into the slot 51c, each coil of the stator winding 54 is inserted into the slot 51c. For this reason, the coil end 152 of the stator winding 52, which is the A-phase stator winding, is positioned closer to the outer periphery of the stator core 51 than the coil end 153 of the stator winding 53, which is the B-phase stator winding, and the coil end 154 of the stator winding 54, which is the C-phase stator winding. Furthermore, coil end 153 of stator winding 53, which is the B-phase stator winding, is arranged closer to the outer periphery of stator core 51 than coil end 154 of stator winding 54, which is the C-phase stator winding. In other words, coil end 154 of stator winding 54, which is the C-phase stator winding, is arranged closer to the inner periphery of stator core 51 than coil end 153 of stator winding 53, which is the B-phase stator winding.

[0054] Here, each of the coils of the stator winding 52, the stator winding 53, and the stator winding 54 includes a copper wire 61 and an aluminum wire 62. In other words, each of the coils of the stator winding 52, the stator winding 53, and the stator winding 54 is formed by winding the copper wire 61 and the aluminum wire 62. In this case, in the stator winding of the same phase, the first coil 71 and the second coil 72 are configured to satisfy the relationship shown in FIG.

[0055] Fig. 10 is a cross-sectional view showing the periphery of the slot portion of the stator according to the present embodiment 1. Fig. 10 is a diagram cut along a cross section perpendicular to the central axis of the stator 5b. In other words, Fig. 10 is a diagram cut along a cross section perpendicular to the central axis of the approximately cylindrical core back portion 51a. Note that Figure 10 can be interpreted as follows. For example, when the coils shown in Figure 10 are viewed as stator winding 52, which is an A-phase stator winding, the first coil 71 is coil 52a, coil 52c, or coil 52e, and the second coil 72 is coil 52b, coil 52d, or coil 52f. When the coils shown in Figure 10 are viewed as stator winding 53, which is a B-phase stator winding, the first coil 71 is coil 53a, coil 53c, or coil 53e, and the second coil 72 is coil 53b, coil 53d, or coil 53f. When the coils shown in Figure 10 are viewed as stator winding 54, which is a C-phase stator winding, the first coil 71 is coil 54a, coil 54c, or coil 54e, and the second coil 72 is coil 54b, coil 54d, or coil 54f.

[0056] In describing the relationship between the first coil 71 and the second coil 72 shown in FIG. 10, the first ratio R1 and the second ratio R2 are defined as follows. The value obtained by dividing the number of aluminum wires 62 in the first coil 71 by the number of copper wires 61 in the first coil 71 is defined as the first ratio R1. Furthermore, the value obtained by dividing the number of aluminum wires 62 in the second coil 72 by the number of copper wires 61 in the second coil 72 is defined as the second ratio R2. When the first ratio R1 and the second ratio R2 are defined in this manner, the first coil 71 and the second coil 72 inserted into the same slot portion 51c have the same first ratio R1 and second ratio R2.

[0057] 10 shows an example in which the first ratio R1 and the second ratio R2 are the same, where the number of copper wires 61 in the first coil 71 is the same as the number of copper wires 61 in the second coil 72, and the number of aluminum wires 62 in the first coil 71 is the same as the number of aluminum wires 62 in the second coil 72. More specifically, in the example shown in FIG. 10, the first coil 71 and the second coil 72 each include 35 copper wires 61 and 7 aluminum wires 62. Such first coil 71 and second coil 72 can be formed by, for example, forming a bundle of five copper wires 61 and one aluminum wire 62 and winding the bundle seven times.

[0058] 10, the first coil 71 and the second coil 72 are configured so that the aluminum wires 62 are not in contact with each other. However, the first coil 71 and the second coil 72 may be configured so that two aluminum wires 62 are in contact with each other. Here, in the first embodiment, a state in which the aluminum wires 62 are not in contact with each other within the coil or a state in which two aluminum wires 62 are in contact within the coil is referred to as a state in which the aluminum wires 62 are scattered within the coil.

[0059] Furthermore, as long as the first ratio R1 and the second ratio R2 are the same in the first coil 71 and the second coil 72 inserted into the same slot portion 51c, the aluminum wires 62 may be densely arranged in the first coil 71 and the second coil 72. In the first embodiment, a state in which the aluminum wires 62 are densely arranged refers to a state in which at least one aluminum wire 62 is in contact with two or more other aluminum wires within the coil. In other words, a state in which the aluminum wires 62 are densely arranged refers to a state in which three or more aluminum wires 62 are gathered within the coil. Even if the first coil 71 and the second coil 72 are densely arranged, in the stator 5b according to the first embodiment, the aluminum wires 62 are densely arranged in two or more places within the slot portion 51c. Therefore, even if the first coil 71 and the second coil 72 are densely arranged, the stator 5b according to the first embodiment can prevent the aluminum wires 62 from becoming denser than conventional stators.

[0060] Furthermore, as long as the first ratio R1 and the second ratio R2 are the same for the first coil 71 and the second coil 72 inserted into the same slot 51c, the number of copper wires 61 and aluminum wires 62 constituting the first coil 71 is not limited to the above-mentioned numbers. As long as the first ratio R1 and the second ratio R2 are the same for the first coil 71 and the second coil 72 inserted into the same slot 51c, the number of copper wires 61 and aluminum wires 62 constituting the second coil 72 is not limited to the above-mentioned numbers. For example, the first coil 71 and the second coil 72 may be formed by winding a bundle of three copper wires 61 and one aluminum wire 62 multiple times. In this case, the second coil 72 may be formed by winding the bundle the same number of times as the first coil 71, or may be formed by winding the bundle a different number of times than the first coil 71. That is, as long as the first ratio R1 and the second ratio R2 are the same in the first coil 71 and the second coil 72 inserted into the same slot portion 51c, the number of copper wires 61 in the first coil 71 and the number of copper wires 61 in the second coil 72 may be different. Also, as long as the first ratio R1 and the second ratio R2 are the same in the first coil 71 and the second coil 72 inserted into the same slot portion 51c, the number of aluminum wires 62 in the first coil 71 and the number of aluminum wires 62 in the second coil 72 may be different. Also, for example, as long as the first ratio R1 and the second ratio R2 are the same in the first coil 71 and the second coil 72 inserted into the same slot portion 51c, the first coil 71 and the second coil 72 may be formed by winding a bundle of two copper wires 61 and one aluminum wire 62 multiple times.

[0061] Next, the operation of the stator 5b according to the first embodiment will be described. When the output of the rotating electric machine 5 increases, the current flowing through the stator windings 52, 53, and 54 increases. This increases the amount of heat generated by each coil of these stator windings. The resistance of the copper wire 61 and the aluminum wire 62 increases with temperature.

[0062] The resistance value Rα [Ω] of the copper wire 61 and the aluminum wire 62 after the temperature rise can be calculated by the following formula (1). Rα=R0×(A+α) / (A+T0)…(1) Here, A is the temperature coefficient of resistance. Also, α is the actual temperature [°C]. More specifically, when calculating the resistance value Rα of the copper wire 61, α is the actual temperature of the copper wire 61. When calculating the resistance value Rα of the aluminum wire 62, α is the actual temperature of the aluminum wire 62. Also, T0 is the ambient temperature [°C] of the copper wire 61 and the aluminum wire 62. Also, R0 is the resistance value [Ω] at the ambient temperature T0. More specifically, when calculating the resistance value Rα of the copper wire 61, R0 is the resistance value of the copper wire 61 at the ambient temperature T0. When calculating the resistance value Rα of the aluminum wire 62, R0 is the resistance value of the aluminum wire 62 at the ambient temperature T0.

[0063] Here, the temperature coefficient of resistance A of the copper wire 61 is 234.5, and the temperature coefficient of resistance A of the aluminum wire 62 is 225. That is, the rate of increase in resistance due to a rise in temperature is greater for the aluminum wire 62 than for the copper wire 61. Furthermore, the aluminum wire 62 has a higher electrical resistivity than the copper wire 61. Therefore, the aluminum wire 62 generates more heat than the copper wire 61. Furthermore, the aluminum wire 62 has a lower thermal conductivity than the copper wire 61. Therefore, the aluminum wire 62 is more susceptible to temperature rise.

[0064] For the reasons described above, if the aluminum wires 62 are densely packed in one area within the slot portion 51c, the heat generated by the aluminum wires 62 cannot be efficiently dissipated, and the temperature of the area where the aluminum wires 62 are densely packed is likely to rise. That is, in a conventional stator using copper wires and aluminum wires for the stator winding, the aluminum wires are densely packed in one area within the slot portion, and the temperature of the area where the aluminum wires are densely packed is likely to rise. As a result, in a conventional stator using copper wires and aluminum wires for the stator winding, the resistance of the aluminum wires further increases, resulting in increased losses. For this reason, a rotating electric machine equipped with this conventional stator has reduced efficiency.

[0065] On the other hand, in the stator 5b according to the first embodiment, the aluminum wires 62 are not densely packed in one place within the slots 51c. Therefore, the stator 5b according to the first embodiment can suppress a local temperature rise within the slots 51c. Therefore, the stator 5b according to the first embodiment can suppress an increase in the resistance of the aluminum wires 62 and reduce losses, compared to a conventional stator using copper wires and aluminum wires for the stator windings. Therefore, the stator 5b according to the first embodiment can suppress a decrease in efficiency of the rotating electric machine 5 including the stator 5b, compared to a conventional stator using copper wires and aluminum wires for the stator windings. In other words, the stator 5b according to the first embodiment can suppress a decrease in efficiency of the scroll compressor 100 including the rotating electric machine 5 and the refrigeration cycle apparatus 200 including the scroll compressor 100, compared to a conventional stator using copper wires and aluminum wires for the stator windings.

[0066] As described above, the stator 5b according to the first embodiment includes a stator core 51 and a stator winding wound around the stator core 51. The stator core 51 includes a cylindrical core back portion 51a and a plurality of teeth 51b protruding from the core back portion 51a toward the inner periphery of the core back portion 51a. The stator core 51 has slots 51c formed between the core back portion 51a and adjacent teeth 51b. The stator 5b is a stator of a three-phase rotating electric machine 5. When the number of poles of the stator 5b is p and the number of slots 51c is s, the stator 5b satisfies s=3p. The stator 5b includes a stator winding for each phase. Each stator winding includes a plurality of coils (s / 3) inserted into the slots 51c across a specified number of teeth 51b. Each coil includes a copper wire 61 and an aluminum wire 62. The stator winding of the same phase has two coils inserted in the same slot 51c. If one of the coils inserted in the same slot 51c is a first coil 71 and the other of the coils inserted in the same slot 51c is a second coil 72, the first coil 71 is disposed closer to the outer periphery of the stator core 51 than the second coil 72 within the slot 51c. If the value obtained by dividing the number of aluminum wires 62 in the first coil 71 by the number of copper wires 61 in the first coil 71 is defined as a first ratio R1 and the value obtained by dividing the number of aluminum wires 62 in the second coil 72 by the number of copper wires 61 in the second coil 72 is defined as a second ratio R2, the first ratio R1 and the second ratio R2 will be the same.

[0067] As described above, the stator 5b configured in this manner can suppress a decrease in efficiency of the rotating electrical machine 5 equipped with the stator 5b, compared to a conventional stator that uses copper wires and aluminum wires for the stator windings.

[0068] Embodiment 2 In the first embodiment, the ratio between the number of copper wires 61 and the number of aluminum wires 62 in each coil in the stator windings of the same phase was described. In the second embodiment, the ratio between the number of copper wires 61 and the number of aluminum wires 62 suitable for stator windings of different phases will be described. Note that matters not specifically mentioned in the second embodiment are the same as those in the first embodiment. Furthermore, in the second embodiment, components that perform the same functions as the components shown in the first embodiment will be assigned the same reference numerals as in the first embodiment.

[0069] In the second embodiment, the average number of copper wires 61 in each coil in the stator winding 52, which is the A-phase stator winding, is xa. Also, in the second embodiment, the average number of aluminum wires 62 in each coil in the stator winding 52 is ya. Here, the ratio Ra is the value obtained by dividing the average number of aluminum wires 62 in each coil in the stator winding 52 by the average number of copper wires 61 in each coil in the stator winding 52. In other words, Ra=ya / xa.

[0070] In the second embodiment, the average number of copper wires 61 in each coil in the stator winding 53, which is the B-phase stator winding, is xb. In the second embodiment, the average number of aluminum wires 62 in each coil in the stator winding 53 is yb. Here, the value obtained by dividing the average number of aluminum wires 62 in each coil in the stator winding 53 by the average number of copper wires 61 in each coil in the stator winding 53 is defined as a ratio Rb. That is, Rb=yb / xb.

[0071] In the second embodiment, the average number of copper wires 61 in each coil in the stator winding 54, which is the C-phase stator winding, is xc. In the second embodiment, the average number of aluminum wires 62 in each coil in the stator winding 54 is yc. Here, the ratio Rc is the value obtained by dividing the average number of aluminum wires 62 in each coil in the stator winding 54 by the average number of copper wires 61 in each coil in the stator winding 54. In other words, Rc=yc / xc.

[0072] When the ratios Ra, Rb, and Rc are defined in this way, the stator 5b according to the second embodiment satisfies Ra≧Rb>Rc.

[0073] As described above, after each coil of the stator winding 52 is inserted into the slot 51c, each coil of the stator winding 53 is inserted into the slot 51c. Furthermore, after each coil of the stator windings 52 and 53 is inserted into the slot 51c, each coil of the stator winding 54 is inserted into the slot 51c. Therefore, as shown in FIG. 9 , the coil end 152 of the stator winding 52, which is the A-phase stator winding, is positioned closer to the outer periphery of the stator core 51 than the coil end 153 of the stator winding 53, which is the B-phase stator winding, and the coil end 154 of the stator winding 54, which is the C-phase stator winding. Furthermore, the coil end 153 of the stator winding 53, which is the B-phase stator winding, is positioned closer to the outer periphery of the stator core 51 than the coil end 154 of the stator winding 54, which is the C-phase stator winding. In other words, the coil end 154 of the stator winding 54, which is the C-phase stator winding, is arranged closer to the inner periphery of the stator core 51 than the coil end 153 of the stator winding 53, which is the B-phase stator winding. In addition, the coil end 152 of the stator winding 52, the coil end 153 of the stator winding 53, and the coil end 154 of the stator winding 54 are arranged around the entire circumference of the stator core 51.

[0074] For this reason, when inserting each coil of the stator winding 54, which is a C-phase stator winding, into the slots 51c, the insertion jig is likely to interfere with the coil end 152 of the stator winding 52 and the coil end 153 of the stator winding 53. Therefore, it is more difficult to insert each coil of the stator winding 54, which is a C-phase stator winding, into the slots 51c than the stator winding 52, which is an A-phase stator winding, and the stator winding 53, which is a B-phase stator winding.

[0075] Therefore, in a process prior to inserting each coil of the stator winding 54, which is the C-phase stator winding, into the slots 51c, the coil ends 152 of the stator winding 52 and the coil ends 153 of the stator winding 53 are shaped so as to be less likely to interfere with the insertion jig. Then, after this, each coil of the stator winding 54, which is the C-phase stator winding, is inserted into the slots 51c. This reduces the possibility that the insertion jig will interfere with the coil ends 152 of the stator winding 52 and the coil ends 153 of the stator winding 53, making it easier to insert each coil of the stator winding 54, which is the C-phase stator winding, into the slots 51c.

[0076] As described above, the stator 5b according to the second embodiment satisfies Ra≧Rb>Rc. That is, the stator winding 52, which is the A-phase stator winding, and the stator winding 53, which is the B-phase stator winding, have a larger ratio of the number of aluminum wires 62 to the number of copper wires 61 than the stator winding 54, which is the C-phase stator winding. Furthermore, the aluminum wires 62 are softer than the copper wires 61 and have excellent formability. That is, the stator winding 52, which is the A-phase stator winding, and the stator winding 53, which is the B-phase stator winding, are softer and have excellent formability than the stator winding 54, which is the C-phase stator winding.

[0077] Therefore, the stator 5b according to the second embodiment can achieve the following effect in addition to the effect achieved in the first embodiment. As described above, by shaping the coil ends 152 of the stator winding 52 and the coil ends 153 of the stator winding 53 in a process prior to inserting each coil of the stator winding 54 into the slots 51c, it becomes easier to insert each coil of the stator winding 54 into the slots 51c. In this case, in the stator 5b according to the second embodiment, the stator winding 52, which is the A-phase stator winding, and the stator winding 53, which is the B-phase stator winding, are softer and more formable than the stator winding 54, which is the C-phase stator winding. Therefore, in the stator 5b according to the second embodiment, it is easier to shape the coil ends 152 of the stator winding 52 and the coil ends 153 of the stator winding 53, compared to a case in which the stator windings 52, 53, and 54 have the same hardness. Furthermore, in the stator 5b according to the second embodiment, it is easier to insert each coil of the stator winding 52 and each coil of the stator winding 53 into the slots 51c than when the stator windings 52, 53, and 54 have the same hardness. Therefore, the stator 5b according to the second embodiment has the effect of facilitating the manufacture of the stator 5b. In other words, the stator 5b according to the second embodiment improves the productivity of the stator 5b.

[0078] Embodiment 3 When the stator 5b is configured such that Ra≧Rb>Rc, it is preferable that the average number of copper wires 61 constituting each coil of different stator windings has the relationship shown in the present embodiment 3. Note that matters not specifically mentioned in the present embodiment 3 are the same as those in the first or second embodiment. Furthermore, in the present embodiment 3, components that perform the same functions as those shown in the first or second embodiment are denoted by the same reference numerals as those in the first or second embodiment.

[0079] Like the stator 5b shown in the second embodiment, the stator 5b according to the third embodiment satisfies Ra≧Rb>Rc. Furthermore, in the stator 5b according to the third embodiment, the average number of copper wires 61 in each coil of the stator winding 52, which is the A-phase stator winding, the average number of copper wires 61 in each coil of the stator winding 53, which is the B-phase stator winding, and the average number of copper wires 61 in each coil of the stator winding 54, which is the C-phase stator winding, are the same. That is, in the stator 5b according to the third embodiment, xa=xb=xc.

[0080] When the stator 5b satisfies Ra≧Rb>Rc, the stator winding 54, which is the C-phase stator winding, has a smaller ratio of the number of aluminum wires 62 to the number of copper wires 61 than the stator winding 52, which is the A-phase stator winding, and the stator winding 53, which is the B-phase stator winding. Therefore, since Ra≧Rb>Rc and xa=xb=xc, the stator winding 54, which is the C-phase stator winding, has a smaller total number of copper wires 61 and aluminum wires 62 than the stator winding 52, which is the A-phase stator winding, and the stator winding 53, which is the B-phase stator winding. In other words, the stator winding 54, which is the C-phase stator winding, is thinner than the stator winding 52, which is the A-phase stator winding, and the stator winding 53, which is the B-phase stator winding. In other words, the cross-sectional area of each coil of the stator winding 54, which is the C-phase stator winding, is smaller than that of the stator winding 52, which is the A-phase stator winding, and the stator winding 53, which is the B-phase stator winding.

[0081] The stator 5b according to the third embodiment configured as above can achieve the following effects in addition to the effects shown in the first and second embodiments.

[0082] As can be seen from FIG. 7 , each coil of the stator winding 54, which is the C-phase stator winding, is disposed closer to the inner periphery of the stator core 51 than each coil of the stator winding 53, which is the B-phase stator winding, and each coil of the stator winding 52, which is the A-phase stator winding. Therefore, each coil of the stator winding 54, which is the C-phase stator winding, tends to have a shorter circumferential length than each coil of the stator winding 53, which is the B-phase stator winding, and each coil of the stator winding 52, which is the A-phase stator winding. Therefore, each coil of the stator winding 54, which is the C-phase stator winding, tends to have a smaller resistance than each coil of the stator winding 53, which is the B-phase stator winding, and each coil of the stator winding 52, which is the A-phase stator winding. For this reason, by configuring the stator 5b as in the third embodiment, it is possible to reduce the thickness of the stator winding 54, which is the C-phase stator winding, while minimizing the imbalance in resistance among the stator windings of each phase. Therefore, by configuring stator 5b as in the third embodiment, it becomes easy to insert each coil of stator winding 54, which is the C-phase stator winding, into slot portion 51c, and an effect can be obtained in which the manufacture of stator 5b becomes even easier. In other words, by configuring stator 5b as in the third embodiment, the productivity of stator 5b is further improved.

[0083] Note that the coils of the stator winding 53, which is the B-phase stator winding, are disposed closer to the inner periphery of the stator core 51 than the coils of the stator winding 52, which is the A-phase stator winding. Therefore, the circumferential length of the coils of the stator winding 53, which is the B-phase stator winding, is likely to be shorter than the coils of the stator winding 52, which is the A-phase stator winding. Therefore, the resistance of the coils of the stator winding 53, which is the B-phase stator winding, is likely to be smaller than the resistance of the coils of the stator winding 52, which is the A-phase stator winding. Therefore, Ra>Rb and xa=xb may be satisfied, and the stator winding 53, which is the B-phase stator winding, may be thinner than the stator winding 52, which is the A-phase stator winding. This facilitates the insertion of the coils of the stator winding 53, which is the B-phase stator winding, into the slots 51c, further facilitating the manufacture of the stator 5b. In other words, the productivity of the stator 5b is further improved.

[0084] Embodiment 4 Configuring the stator 5b as in the present embodiment 4 also makes it easier to manufacture the stator 5b. Note that matters not specifically mentioned in the present embodiment 4 are the same as those in any of the embodiments 1 to 3. Furthermore, in the present embodiment 4, components that perform the same functions as those in any of the embodiments 1 to 3 are assigned the same reference numerals as those in any of the embodiments 1 to 3.

[0085] In describing stator 5b according to the fourth embodiment, GSa, GSb, and GSc are defined as follows. GSa is the sum of the cross-sectional areas of copper wires 61 constituting stator winding 52, which is the A-phase stator winding, in a cross section perpendicular to the central axis of core-back portion 51a. The cross section perpendicular to the central axis of core-back portion 51a is, for example, the cross section shown in FIG. 10. GSb is the sum of the cross-sectional areas of copper wires 61 constituting stator winding 53, which is the B-phase stator winding, in a cross section perpendicular to the central axis of core-back portion 51a. GSc is the sum of the cross-sectional areas of copper wires 61 constituting stator winding 54, which is the C-phase stator winding, in a cross section perpendicular to the central axis of core-back portion 51a.

[0086] When GSa, GSb, and GSc are defined in this way, the stator 5b according to the fourth embodiment satisfies GSa≧GSb>GSc.

[0087] Specifically, in the fourth embodiment, the stator 5b is configured as follows, thereby satisfying GSa≧GSb>GSc. The stator winding 52, the stator winding 53, and the stator winding 54 satisfy xa=xb=xc as shown in the third embodiment. More specifically, in the fourth embodiment, the number of copper wires 61 constituting the stator winding 52, the number of copper wires 61 constituting the stator winding 53, and the number of copper wires 61 constituting the stator winding 54 are the same. Furthermore, at least one of the copper wires 61 constituting the stator winding 54 is thinner than the copper wires 61 constituting the stator winding 52 and the copper wires 61 constituting the stator winding 53. The remaining copper wires 61 constituting the stator winding 54 have approximately the same thickness as the copper wires 61 constituting the stator winding 52 and the copper wires 61 constituting the stator winding 53. By configuring stator 5b in this manner, it is possible to satisfy xa = xb = xc while also satisfying GSa ≥ GSB > GSc. Note that the number of copper wires 61 constituting stator winding 54 may be less than the number of copper wires 61 constituting stator winding 52 and the number of copper wires 61 constituting stator winding 53. Even with this configuration, it is possible to satisfy GSa ≥ GSB > GSc.

[0088] By satisfying GSa≧GSb>GSc, the stator winding 54, which is the C-phase stator winding, becomes thinner than the stator winding 52, which is the A-phase stator winding, and the stator winding 53, which is the B-phase stator winding. Therefore, as described in the third embodiment, it becomes easy to insert each coil of the stator winding 54, which is the C-phase stator winding, into the slot portion 51c. Therefore, by configuring the stator 5b as in the fourth embodiment, it becomes easy to manufacture the stator 5b, and the productivity of the stator 5b improves. [Explanation of symbols]

[0089] 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, 3b reciprocating sliding surface, 3c main bearing, 3d auxiliary main bearing, 3e communicating hole, 3f communicating hole, 3g intermediate pressure adjusting valve, 3h intermediate pressure adjusting valve retainer, 3k intermediate pressure adjusting spring, 3n intermediate pressure adjusting valve space, 3p upper cylindrical surface portion, 3s lower cylindrical surface portion, 3t thrust bearing opening, 4 guide frame, 4a Frame upper space, 4b frame lower space, 4c upper cylindrical surface portion, 4d lower cylindrical surface portion, 4f first passage, 4g first discharge passage, 5 rotating electric 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 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 section, 15a balance weight, 15b 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, 51c slot portion, 52 stator winding, 52a to 52f coils, 53 stator winding, 53a to 53f coils, 54 stator winding, 54a to 54f coils, 61 copper wire, 62 aluminum wire, 71 first coil, 72 second coil, 100 scroll compressor, 101 suction muffler, 103 four-way switching valve, 104 outdoor heat exchanger, 105 pressure reducer, 106 indoor heat exchanger, 152 coil end, 153 coil end, 154 Coil end, 200 refrigeration cycle device.

Claims

1. a stator core having a cylindrical core back portion and a plurality of teeth protruding from the core back portion toward the inner periphery of the core back portion, with slots formed between the core back portion and adjacent teeth portions; a stator winding wound on the stator core; A stator for a three-phase rotating electric machine comprising: When the number of poles is p and the number of slots is s, s = 3p is satisfied, The stator winding is provided for each of the phases, each of the stator windings includes a plurality of coils (s / 3 in number) inserted into the slots across a specified number of the teeth, Each of the coils comprises a copper wire and an aluminum wire; the stator winding of the same phase has a configuration in which two of the coils are inserted into the same slot portion, when one of the coils inserted into the same slot is a first coil and the other of the coils inserted into the same slot is a second coil, the first coil is disposed closer to the outer periphery of the stator core than the second coil within the slot, a first ratio is a value obtained by dividing the number of the aluminum wires in the first coil by the number of the copper wires in the first coil; When a value obtained by dividing the number of the aluminum wires in the second coil by the number of the copper wires in the second coil is defined as a second ratio, The first ratio and the second ratio are the same. stator.

2. The number of the copper wires in the first coil is the same as the number of the copper wires in the second coil, The number of the aluminum wires in the first coil is the same as the number of the aluminum wires in the second coil. The stator of claim 1 .

3. one of the phases is phase A; Among the phases, one other than the A phase is designated as a B phase, When the phase other than the A phase and the B phase is defined as a C phase, a coil end of the B-phase stator winding is disposed closer to the outer periphery of the stator core than a coil end of the C-phase stator winding, a coil end of the A-phase stator winding is disposed closer to the outer periphery of the stator core than a coil end of the B-phase stator winding, a ratio Ra is defined as a value obtained by dividing the average number of the aluminum wires in each of the coils in the A-phase stator winding by the average number of the copper wires in each of the coils in the A-phase stator winding, a ratio Rb is defined as a value obtained by dividing the average number of the aluminum wires in each of the coils in the B-phase stator winding by the average number of the copper wires in each of the coils in the B-phase stator winding, When a value obtained by dividing the average number of the aluminum wires in each of the coils in the C-phase stator winding by the average number of the copper wires in each of the coils in the C-phase stator winding is defined as a ratio Rc, Ra≧Rb>Rc The stator according to claim 1 or 2.

4. The average number of the copper wires in each of the coils in the stator winding for the A phase, the average number of the copper wires in each of the coils in the stator winding for the B phase, and the average number of the copper wires in each of the coils in the stator winding for the C phase are the same. The stator according to claim 3 .

5. one of the phases is phase A; Among the phases, one other than the A phase is designated as a B phase, Among the phases, a phase other than the A phase and the B phase is designated as a C phase, In a cross section perpendicular to the central axis of the core back portion, when the sum of the cross-sectional areas of the copper wires constituting the A-phase stator winding is GSa, the sum of the cross-sectional areas of the copper wires constituting the B-phase stator winding is GSb, and the sum of the cross-sectional areas of the copper wires constituting the C-phase stator winding is GSc, GSa≧GSb>GSc It has become The stator according to claim 1 or 2.

6. The stator according to claim 1 or 2; a rotor rotatably provided on the inner circumferential side of the stator; A rotating electric machine equipped with the above.

7. a rotating electric machine according to claim 6; a compression mechanism that compresses a refrigerant using a driving force of the rotating electric machine; A compressor equipped with

8. The compressor according to claim 7; a radiator through which the refrigerant compressed by the compressor radiates heat; a pressure reducer that reduces the pressure of the refrigerant flowing out from the radiator; an evaporator in which the refrigerant flowing out from the pressure reducer evaporates; A refrigeration cycle device comprising:

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