Stator, electric motor, compressor, refrigeration cycle device, and method for manufacturing stator

Abstract

The present invention comprises: a cylindrical stator core (34); a first coated wire including a first conductor wire which, between a first conductor wire and a second conductor wire having different hardnesses, is harder than the second conductor wire, and an insulating coating covering the circumference of the first conductor wire; and a second coated wire including the second conductor wire and an insulating coating that covers the circumference of the second conductor wire and has a thicker thickness than that of the insulating coating covering the circumference of the first conductor wire. The first coated wire and the second coated wire are wound in an intermingled manner around a plurality of teeth sections (36) provided along the circumferential direction of the stator core (34). As a result, it is possible to suppress the occurrence of short circuits and burnout in a coil (35).

Description

[Technical Field]

[0001] The present disclosure relates to a stator, an electric motor, a compressor, a refrigeration cycle device, and a method for manufacturing a stator. [Background technology]

[0002] In general, in an electric motor, a coil is formed by winding a coated wire around a plurality of teeth provided around a cylindrical stator core in the circumferential direction. For example, the coated wire may be a copper wire made of a copper conductor and an insulating coating covering the copper conductor, or an aluminum wire made of an aluminum conductor and an insulating coating covering the aluminum conductor.

[0003] For example, in Patent Document 1, a coil is formed by winding a copper wire and an aluminum wire around each tooth in a concentrated winding manner. In such a case, there is no need to simultaneously hold both the copper wire and the aluminum wire in the gripping part of the winding machine. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] WO2014 / 188466 publication Summary of the Invention [Problem to be solved by the invention]

[0005] However, when a coil is formed by winding a mixture of copper wire and aluminum wire around each tooth, the copper wire and aluminum wire are held simultaneously by the gripping part of the winding machine. Generally, the wire diameters of the copper conductor and aluminum conductor, as well as the thickness of the insulating coating that surrounds each wire, are made the same to prevent gaps from occurring between each wire and the gripping part due to differences in the wire diameters of the copper wire and aluminum wire.

[0006] However, because the hardness of each conductor wire is different, the amount of deformation of each conductor wire due to the gripping force of the gripping part varies, which also leads to differences in the contact between each wire and the gripping part.For these reasons, there is a risk that each wire will easily come out of the gripping part and become distorted. Therefore, if the gripping force of the gripping part is increased to prevent winding irregularities, the gripping force of the gripping part will cause an indentation in the aluminum conductor, which is softer than the copper conductor, and greater stress will be generated in the cross section of the aluminum conductor where the indentation has occurred than in the cross section of the aluminum conductor where the indentation has not occurred, resulting in the problem that the aluminum conductor will be more susceptible to breakage than if the indentation had not occurred.

[0007] In addition to the problem of aluminum conductors being prone to breakage as described above, when the gripping force of the gripping part is increased, the contact area between the gripping part and the insulating coating of each wire is larger on the surface of the insulating coating that surrounds the aluminum conductor wire than on the surface of the insulating coating that surrounds the copper conductor wire, so the insulating coating that surrounds the aluminum conductor wire is affected by the gripping force of the gripping part over a wider area than the insulating coating that surrounds the copper conductor wire. As a result, the contact of the gripping part with the surface of the insulating coating and the effect of the gripping force of the gripping part cause deformation or scratches on the surface, which can lead to indentations and cracks, making it difficult to ensure the dielectric strength of the insulating coating that surrounds the aluminum conductor wire.

[0008] As described above, when aluminum conductors are prone to breakage and the dielectric strength of the insulating coating that surrounds the aluminum conductors is not ensured, there is a problem that short circuits and burnout are more likely to occur in the coil.

[0009] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a coil that can suppress the occurrence of short circuits and burnout. [Means for solving the problem]

[0010] The stator according to the present disclosure comprises a cylindrical stator core, a first coated wire having an insulating coating covering the first conductive wire and the first conductive wire, the first conductive wire being harder than the second conductive wire, and a second coated wire having an insulating coating covering the second conductive wire that is thicker than the insulating coating covering the second conductive wire and the first conductive wire, and the first coated wire and the second coated wire are wound around a plurality of teeth arranged circumferentially around the stator core in a mixed manner.

[0011] The electric motor according to the present disclosure comprises a cylindrical stator core, a first coated wire having an insulating coating covering the first conductor and the first conductor, the first conductor being harder than the second conductor, and a second coated wire having an insulating coating covering the second conductor that is thicker than the insulating coating covering the second conductor and the first conductor, the electric motor comprising a stator in which the first coated wire and the second coated wire are mixed and wound around a plurality of teeth arranged circumferentially around the stator core, and a rotor that rotates using the magnetic field generated by the stator.

[0012] The compressor according to the present disclosure comprises a cylindrical stator core, a first coated wire having an insulating coating covering the first conductive wire and the first conductive wire, the first conductive wire being harder than the second conductive wire, and a second coated wire having an insulating coating covering the second conductive wire that is thicker than the insulating coating covering the second conductive wire and the first conductive wire, and the first coated wire and the second coated wire are wound around a plurality of teeth arranged circumferentially of the stator core in a mixed manner, the first coated wire and the second coated wire being wound around a plurality of teeth arranged circumferentially of the stator core, the compressor further comprising: an electric motor having a rotor that rotates using a magnetic field generated by the stator; a sealed container having an intake pipe for drawing in a fluid and a discharge pipe for discharging the fluid; and a compression element that is driven by the electric motor, compresses the fluid drawn in through the intake pipe, and discharges the compressed fluid through the discharge pipe.

[0013] The refrigeration cycle device according to the present disclosure comprises: a cylindrical stator core; a first coated wire having an insulating coating covering the first conductive wire and the first conductive wire, the first conductive wire being harder than the second conductive wire; and a second coated wire having an insulating coating covering the second conductive wire that is thicker than the insulating coating covering the second conductive wire and the first conductive wire, wherein the first coated wire and the second coated wire are mixed and wound around a plurality of teeth arranged along the circumferential direction of the stator core; an electric motor having a rotor that rotates using a magnetic field generated by the stator; an airtight container having an intake pipe for drawing in a fluid and a discharge pipe for discharging the fluid; a compressor driven by the electric motor, compressing the fluid drawn in through the intake pipe and discharging the compressed fluid through the discharge pipe; a condenser that liquefies the fluid; a pressure reducing device that reduces the pressure of the compressed fluid; and an evaporator that vaporizes the fluid.

[0014] A method for manufacturing a stator according to the present disclosure includes the steps of producing a first coated wire having an insulating coating covering the first conductor and the first conductor, the first conductor being harder than the second conductor, and a second coated wire having an insulating coating covering the second conductor that is thicker than the insulating coating covering the second conductor and the first conductor, and winding the first coated wire and the second coated wire together around a plurality of teeth arranged circumferentially around a cylindrical stator core. [Effects of the Invention]

[0015] According to the present disclosure, it is possible to suppress the occurrence of short circuits and burnout in the coil. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a diagram showing a refrigeration cycle device according to a first embodiment. [Figure 2] 1 is a diagram showing a refrigeration cycle device according to a first embodiment. [Figure 3] 1 is a vertical cross-sectional view of a compressor according to a first embodiment. [Figure 4] FIG. 2 is a schematic diagram showing a stator according to the first embodiment. [Figure 5] FIG. 2 is a cross-sectional view showing the stator according to the first embodiment. [Figure 6] FIG. 3 is a wiring diagram of coils in a stator according to the first embodiment. [Figure 7] 3 is a cross-sectional view showing the cross-sectional structure of a winding according to the first embodiment. FIG. [Figure 8] 5 is a flowchart showing a method for manufacturing the stator according to the first embodiment. [Figure 9] 2 is a schematic diagram showing a grip part according to the first embodiment. FIG. [Figure 10] FIG. 10 is a cross-sectional view showing the cross-sectional structure of a winding according to a conventional example. [Figure 11] FIG. 10 is a cross-sectional view showing the cross-sectional structure of a winding according to a second embodiment. [Figure 12] FIG. 10 is a cross-sectional view showing the cross-sectional structure of a winding according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. Note that the drawings are schematic, and the relative sizes and positions shown in different drawings are not necessarily accurately depicted and may be changed as appropriate. In the following description, similar components are denoted by the same reference numerals, and their names and functions are assumed to be the same or similar. Therefore, detailed descriptions thereof may be omitted.

[0018] Embodiment 1

[0019] The refrigeration cycle device 1 in this embodiment will be described. The refrigeration cycle device 1 includes a compressor 2, a condenser 3, a pressure reducing device 4, an evaporator 5, a four-way valve 6, a refrigerant circuit 7, and a control unit 8. 1 and 2, the configuration and operation of the refrigeration cycle apparatus 1 will be described in the case where the refrigeration cycle apparatus 1 is an air conditioner.

[0020] The compressor 2, condenser 3, pressure reducing device 4, evaporator 5 and four-way valve 6 are connected by refrigerant piping to form a refrigeration cycle, in which the refrigerant circulates through the compressor 2, four-way valve 6, condenser 3, pressure reducing device 4 and evaporator 5 in that order. The compressor 2 compresses the refrigerant drawn from the refrigerant circuit 7 to a high temperature and high pressure, and discharges the compressed refrigerant to the four-way valve 6. The four-way valve 6 switches the flow of the refrigerant between heating operation and cooling operation. The condenser 3 exchanges heat with the refrigerant compressed by the compressor 2, thereby dissipating heat from the compressed refrigerant, thereby liquefying the refrigerant. The pressure reducing device 4 expands the refrigerant that has dissipated heat in the condenser 3 . The evaporator 5 exchanges heat with the refrigerant expanded by the pressure reducing device 4, thereby heating the expanded refrigerant and vaporizing the refrigerant. The control unit 8 controls the flow of the refrigerant by controlling the entire refrigeration cycle apparatus 1 based on instructions from an input device such as a remote control. The control unit 8, for example, controls the frequency of the compressor 2 and the four-way valve 6. The control unit 8 is configured, for example, with an analog circuit, a digital circuit, a CPU (Central Processing Unit) and memory, or a combination of two or more of these, and may be provided within the refrigeration cycle apparatus 1 or in a separate housing.

[0021] The refrigerant used may be at least one of HFC (HydroFluoroCarbon) refrigerants such as R32, R125, R134a, R407C, and R410A; HFO (HydroFluoroOlefin) refrigerants such as R1123, R1132(E), R1132(Z), R1132a, R1141, R1234yf, R1234ze(E), and R1234ze(Z); and natural refrigerants such as R290 (propane), R600a (isobutane), R744 (carbon dioxide), and R717 (ammonia).

[0022] The operation of the refrigeration cycle device 1 will now be described. The arrows in Fig. 1 indicate the direction of refrigerant flow during cooling operation, and the arrows in Fig. 2 indicate the direction of refrigerant flow during heating operation. In Fig. 1 and Fig. 2, the refrigerant flow during cooling operation and the refrigerant flow during heating operation in the four-way valve 6 are indicated by solid lines.

[0023] The operation of the refrigeration cycle device 1 during cooling operation will be described. By driving the compressor 2, compressed refrigerant is discharged from the compressor 2. The refrigerant discharged from the compressor 2 flows into a first heat exchanger 9 functioning as a condenser 3 via a four-way valve 6. In the first heat exchanger 9, heat is exchanged between the refrigerant that has flowed in and the refrigerant dissipates heat. The refrigerant discharged from the first heat exchanger 9 is expanded by a pressure reducing device 4. The refrigerant expanded by the pressure reducing device 4 flows into a second heat exchanger 10 functioning as an evaporator 5. In the second heat exchanger 10, heat is exchanged between the refrigerant that has flowed in and the refrigerant is heated. The refrigerant discharged from the second heat exchanger 10 flows into the compressor 2 via the four-way valve 6, becomes compressed refrigerant, and is discharged from the compressor 2 again, and this cycle is repeated.

[0024] The operation of the refrigeration cycle device 1 during heating operation will be described. By driving the compressor 2, compressed refrigerant is discharged from the compressor 2. The refrigerant discharged from the compressor 2 flows into the second heat exchanger 10, which functions as a condenser 3, via the four-way valve 6. In the second heat exchanger 10, heat is exchanged between the refrigerant that has flowed in and the refrigerant dissipates heat. The refrigerant discharged from the second heat exchanger 10 is expanded by the pressure reducing device 4. The refrigerant expanded by the pressure reducing device 4 flows into the first heat exchanger 9, which functions as an evaporator 5. In the first heat exchanger 9, heat is exchanged between the refrigerant that has flowed in and the refrigerant is heated. The refrigerant discharged from the first heat exchanger 9 flows into the compressor 2 via the four-way valve 6, becomes compressed refrigerant, and is discharged from the compressor 2 again, and this cycle is repeated.

[0025] In the present embodiment, an example in which the refrigeration cycle device 1 is an air conditioner has been shown, but the refrigeration cycle device 1 may be a refrigeration cycle device other than an air conditioner. The refrigeration cycle device 1 is, for example, a heat pump cycle device.

[0026] A compressor 2 according to this embodiment will be described. The compressor 2 includes a sealed container 11, an electric motor 12, a crankshaft 13, an intake muffler 14, and a compression element 15. Using Fig. 3, the configuration of the compressor 2 will be described when the compressor 2 is a one-cylinder rotary compressor. In the following description, in Figs. 3 and 4, the direction of the axes of the stator 30 and rotor 31 indicated by A1 is referred to as the "axial direction," the circumferential direction around the axis indicated by arrow C1 is referred to as the "circumferential direction," and the radial direction around the axis indicated by arrow R1 is referred to as the "radial direction."

[0027] The sealed container 11 includes a suction pipe 16 for drawing in a refrigerant and a discharge pipe 17 for discharging the refrigerant. The upper part of the sealed container 11 includes a terminal 19 for connecting an external power supply to a lead wire 18. The bottom part of the sealed container 11 stores refrigerating machine oil 20 for lubricating the sliding parts of the compression element 15. The refrigerating machine oil 20 is, for example, POE (polyol ester), PVE (polyvinyl ether), AB (alkyl benzene), or the like.

[0028] The electric motor 12 is installed inside the sealed container 11 above the compression element 15, and drives the compression element 15 via the crankshaft 13. The refrigerant compressed by the compression element 15 is discharged outside the sealed container 11 via the electric motor 12.

[0029] The suction muffler 14 is disposed outside the sealed container 11 and is connected to a suction pipe 16. The suction muffler 14 supplies refrigerant from the refrigerant circuit 7 of the refrigeration cycle to the cylinder 21 via the suction pipe 16.

[0030] Compression element 15 includes a cylinder 21, a rolling piston 22, a vane (not shown), a main bearing 23, and an auxiliary bearing 24. Compression element 15 is installed inside sealed container 11, with rolling piston 22 disposed in a cylinder chamber (described later) and vane disposed in cylinder 21, and the auxiliary bearing 24, cylinder 21, and main bearing 23 are stacked in this order from bottom to top. Furthermore, compression element 15 compresses refrigerant sucked from suction muffler 14 through suction pipe 16, and discharges the compressed refrigerant from a discharge valve (described later), a discharge muffler 25 (described later), and discharge pipe 17 via electric motor 12.

[0031] The cylinder 21 has a hollow cylindrical shape and includes a cylinder chamber in the hollow portion of the cylinder. The cylinder 21 also includes a suction port 26 that penetrates from the outer circumferential surface of the cylinder 21 into the cylinder chamber so that the refrigerant can be drawn in, and a discharge port (not shown) that is formed by cutting out the upper end of the cylinder 21 so that the refrigerant can be discharged.

[0032] The rolling piston 22 has a hollow cylindrical shape and is slidably attached to the eccentric shaft portion 27 of the crankshaft 13, and performs eccentric rotational motion in the cylinder chamber with the rotation of the crankshaft 13, which is driven to rotate by the electric motor 12. This causes the rolling piston 22 to suck in the refrigerant, compress the sucked refrigerant, and then discharge it.

[0033] The vane is a rectangular parallelepiped, slidably disposed in a vane groove (not shown), and is pressed against the rolling piston 22 by a vane spring (not shown) provided in a vane back pressure chamber (not shown). Here, the vane groove is provided in the cylinder 21 so as to extend in the radial direction so as to communicate with the cylinder chamber, and further passes through the cylinder 21 in the axial direction. The vane back pressure chamber is a circular space, and is provided between the vane groove and the outer peripheral surface of the cylinder 21. When the compressor 2 starts up, there is no difference in pressure between the inside of the sealed container 11 and the cylinder chamber, so the vane is pressed against the rolling piston 22 by the vane spring. When the compressor 2 is in operation, the pressure inside the sealed container 11 is higher than the pressure in the cylinder chamber, so a force is generated that presses the vane against the rolling piston 22.

[0034] The main bearing 23 rotatably supports a main shaft portion 28, which is the portion of the crankshaft 13 above the eccentric shaft portion 27, and closes the upper sides of the cylinder chamber, the vane groove, and the vane back pressure chamber. The main bearing 23 is equipped with a discharge valve (not shown). The sub-bearing 24 rotatably supports a sub-shaft portion 29, which is a portion of the crankshaft 13 below the eccentric shaft portion 27, and closes the lower sides of the cylinder chamber, the vane groove, and the vane back pressure chamber. The discharge muffler 25 is disposed outside the main bearing 23 and discharges the refrigerant from the cylinder chamber into the inside of the sealed container 11 via a discharge valve. The cylinder 21, main bearing 23, and sub-bearing 24 are made of materials such as gray cast iron, sintered steel, and carbon steel, the rolling piston 22 is made of alloy steel containing chromium, and the vane is made of high-speed tool steel.

[0035] In this embodiment, an example has been shown in which the discharge valve and discharge muffler 25 are arranged on the main bearing 23 and outside the main bearing 23, but they may also be provided on at least one of the main bearing 23 and the sub-bearing 24.

[0036] The operation of the compressor 2 will now be described. First, when power is supplied to the electric motor 12 from the terminal 19 via the lead wire 18, the crankshaft 13 rotates, and the rolling piston 22 rotates eccentrically inside the cylinder 21. The interior of the cylinder chamber is divided into two spaces by the rolling piston 22 and the vane. As the crankshaft 13 rotates, the volumes of these two spaces change. In one space, the volume gradually expands, and refrigerant is drawn from the suction muffler 14 through the suction pipe 16 and the suction port 26. In the other space, the volume gradually contracts, and the refrigerant in the space is compressed and discharged from the discharge muffler 25 through the discharge valve and the discharge muffler 25 into the inside of the sealed container 11. The refrigerant discharged into the inside of the sealed container 11 is discharged from the discharge pipe 17 via the electric motor 12 to the outside of the sealed container 11.

[0037] In the present embodiment, an example has been shown in which the compressor 2 is a single-cylinder rotary compressor, but the compressor 2 may be a compressor 2 other than a single-cylinder rotary compressor. The compressor 2 may be, for example, a multi-cylinder rotary compressor, a scroll compressor, or the like.

[0038] The electric motor 12 in this embodiment will be described. The electric motor 12 includes a stator 30 and a rotor 31 that has a fixed gap with the stator 30 and is positioned on the same axis. The electric motor 12 generates a rotating magnetic field by supplying AC power to the coil 35 of the stator 30, and the rotor 31 rotates due to the interaction between the AC current and the rotating magnetic field. The configuration of the electric motor 12 when the electric motor 12 is a squirrel-cage induction motor will be described using Figs. 3 to 6.

[0039] In this embodiment, a case will be described in which the rotor 31 is a rotor 31 that constitutes a squirrel-cage induction motor. As shown in FIG. 3, the rotor 31 includes a rotor core 32, rotor bars (not shown), and end rings 33. The rotor core 32 is cylindrical and has slots (not shown) arranged at equal intervals along the circumferential direction. The rotor core 32 is manufactured by laminating a plurality of electromagnetic steel plates, each having a thickness of 0.1 to 1.5 mm, punched into a predetermined shape in the axial direction and fixing them by caulking, welding, or the like. The rotor core 32 has through holes (not shown) formed in the axial direction, which serve as passages for the gas refrigerant discharged from the discharge muffler 25 to the inside of the sealed container 11. The rotor bar is an electrical inductor having an axial length, a circumferential width, and a radial thickness, and is filled or inserted into the slot portion. The rotor bar is made of, for example, aluminum. The end rings 33 short-circuit both ends of the rotor bar.

[0040] In this embodiment, an example has been shown in which the rotor 31 is a rotor 31 that constitutes a squirrel-cage induction motor, but the rotor 31 may be a rotor 31 that constitutes a motor 12 other than a squirrel-cage induction motor. The rotor 31 is, for example, a rotor 31 that constitutes a DC motor, a brushless DC motor, an AC motor, etc.

[0041] As shown in FIGS. 4 to 6, the stator 30 includes a stator core 34 and a coil 35. The stator core 34 has a hollow cylindrical shape and has teeth 36 arranged at equal intervals along the circumferential direction. The stator core 34 is manufactured by laminating a plurality of electromagnetic steel plates, each having a thickness of 0.1 to 1.5 mm, punched into a predetermined shape in the axial direction and fixing them by caulking, welding, or the like. Notches (not shown) are formed at equal intervals along the circumferential direction on the outer periphery of the stator core 34, and serve as passages for the gas refrigerant discharged from the discharge muffler 25 to the inside of the sealed container 11 and for the refrigeration oil 20 returning from the motor 12 to the bottom of the sealed container 11.

[0042] The coil 35 has an independent U-phase coil portion 41, a V-phase coil portion 42, and a W-phase coil portion 43. Furthermore, a lead wire 18 that supplies power from a power source to the electric motor 12 is connected to the coil.

[0043] As shown in FIG. 6, the U-phase coil portion 41 is composed of a U-phase copper wire coil portion 44 and a U-phase aluminum wire coil portion 45, the V-phase coil portion 42 is composed of a V-phase copper wire coil portion 46 and a V-phase aluminum wire coil portion 47, and the W-phase coil portion 43 is composed of a W-phase copper wire coil portion 48 and a W-phase aluminum wire coil portion 49.

[0044] The U-phase copper wire coil section 44 is composed of four U-phase copper wire coils 44a, 44b, 44c, and 44d; the U-phase aluminum wire coil section 45 is composed of four U-phase aluminum wire coils 45a, 45b, 45c, and 45d; the V-phase copper wire coil section 46 is composed of four V-phase copper wire coils 46a, 46b, 46c, and 46d; the V-phase aluminum wire coil section 47 is composed of four V-phase aluminum wire coils 47a, 47b, 47c, and 47d; the W-phase copper wire coil section 48 is composed of four W-phase copper wire coils 48a, 48b, 48c, and 48d; and the W-phase aluminum wire coil section 49 is composed of four W-phase aluminum wire coils 49a, 49b, 49c, and 49d.

[0045] A U-phase copper wire terminal wire 44e, which is one of the terminals of the U-phase copper wire coils 44a, 44b, 44c, and 44d, and a U-phase aluminum wire terminal wire 45e, which is one of the terminals of the U-phase aluminum wire coils 45a, 45b, 45c, and 45d, are connected to the neutral point 50. Similarly, a V-phase copper wire terminal wire 46e, which is one of the terminals of the V-phase copper wire coils 46a, 46b, 46c, and 46d, and a V-phase aluminum wire terminal wire 47e, which is one of the terminals of the V-phase aluminum wire coils 47a, 47b, 47c, and 47d, are connected to the neutral point 50. A W-phase copper wire terminal wire 48e, which is one of the terminals of the W-phase copper wire coils 48a, 48b, 48c, and 48d, and a W-phase aluminum wire terminal wire 49e, which is one of the terminals of the W-phase aluminum wire coils 49a, 49b, 49c, and 49d, are connected to the neutral point 50.

[0046] With the above configuration, the U-phase copper wire coil portion 44, the V-phase copper wire coil portion 46, the W-phase copper wire coil portion 48, the U-phase aluminum wire coil portion 45, the V-phase aluminum wire coil portion 47, and the W-phase aluminum wire coil portion 49 are gathered in one location, forming the neutral point 50.

[0047] The winding 60 in this embodiment will be described below. The winding 60 is a collective term for two coated wires described later, and is wound around the teeth 36 of the stator 30 to form the coil 35.

[0048] FIG. 7 shows the cross-sectional structure of winding 60 in this embodiment. Winding 60 includes two covered wires, each of which includes a conductor wire with a different hardness and an insulating coating covering the conductor wire with a different hardness. Of the conductor wires with different hardness, the soft conductor wire and the hard conductor wire have the same wire diameter, and the insulating coating covering the soft conductor wire is thicker than the insulating coating covering the hard conductor wire. Details are provided below.

[0049] The cross-sectional shape of the coated wire and the conductor is both circular, and the wire diameter of each of the coated wire and the conductor is defined as the diameter of the circle. Conductive wires are made of either copper or aluminum. Copper and aluminum have different hardnesses, with copper having a Vickers hardness of approximately 50 to 60 HV and aluminum having a Vickers hardness of approximately 20 to 30 HV. In other words, among the conductors with different hardnesses, the hard conductor is a copper conductor, and the soft conductor is an aluminum conductor.

[0050] In describing the windings in this embodiment, the copper conductor is referred to as conductor 61C, the aluminum conductor is referred to as conductor 61A, the insulating coating covering the periphery of conductor 61C is referred to as insulating coating 62C, the insulating coating covering the periphery of conductor 61A is referred to as insulating coating 62A, the coated wire having conductor 61C and insulating coating 62C is referred to as coated wire 63C, and the coated wire having conductor 61A and insulating coating 62A is referred to as coated wire 63A.

[0051] The wire diameter 64C of the conductor 61C and the wire diameter 64A of the conductor 61A are, for example, 1.0 mm. The thickness 65C of the insulating coating 62C is, for example, 0.04 mm, and the thickness 65A of the insulating coating 62A is, for example, 0.052 mm. The insulating coatings 62C and 62A are made of an electrically insulating material, such as polyamideimide, polyesterimide, polyester, polyurethane, or formal. In this case, the wire diameter 66C of the covered wire 63C is the sum of the wire diameter 64C of the conductor 61C and twice the thickness 65C of the insulating coating 62C, which is 1.08 mm, and the wire diameter 66A of the covered wire 63A is similarly 1.104 mm.

[0052] In this embodiment, an example is shown in which coated wire material 63C and coated wire material 63A are 0.04 mm and 0.52 mm, respectively. However, coated wire material 63C and coated wire material 63A may be selected based on the dimensions of each wire specified in JIS (Japanese Industrial Standards) so that wire diameter 64C of conductor 61C and wire diameter 64A of conductor 61A are the same and thickness 65A of insulating coating 62A is thicker than thickness 65C of insulating coating 62C.

[0053] In addition, in this embodiment, the example in which the covered wire material 63C and the covered wire material 63A are round wires has been shown, but they may also be rectangular wires.

[0054] A method for manufacturing the stator 30 in this embodiment will be described with reference to FIG. In step S1, the conductive wires 61C and 61A and an electrically insulating material are prepared. In the following description, the electrically insulating material is polyamideimide. Then, in step S2, the conductive wires 61C and 61A are annealed. Then, in step S3, the conductor wires 61C and 61A annealed in step S2 are softened. Then, in step S4, polyamideimide is applied to the conductive wires 61C and 61A softened in step S3. Then, in step S5, the conductor wires 61C and 61A coated with polyamideimide in step S4 are baked to form the insulating coatings 62C and 62A, which are then turned into coated wire materials 63C and 63A. Here, wire diameter 64A of conductor 61A and wire diameter 64C of conductor 61C are the same, and insulating coating 62C and insulating coating 62A are formed so that thickness 65A of insulating coating 62A is thicker than thickness 65C of insulating coating 62C. Then, in step S6, the covered wire 63C and the covered wire 63A manufactured in step S5 are simultaneously held by the holding unit 51, which will be described later. Then, in step S7, the gripping portion 51 is driven to wind the coated wire material 63C and the coated wire material 63A around the teeth portion 36 in a predetermined winding manner. The winding manner may be, for example, concentrated winding, concentric winding, lap winding, wave winding, or the like. The coil 35 of this embodiment is completed through steps S1 to S7. The coil 35 shown in Fig. 4 has the coated wire material 63C and the coated wire material 63A wound concentrically around the teeth portion 36.

[0055] Here, the gripping unit 51 will be described. As shown in Fig. 9, the gripping unit 51 includes a fixed unit 52 and a movable unit 53. The gripping unit 51 is one of the components of a winding machine, which is a machine that manufactures the coil 35 from the winding 60. The winding machine winds the covered wire material 63C and the covered wire material 63A around the tooth portion 36 by driving the gripping unit 51 that holds the covered wire material 63C and the covered wire material 63A between the fixed unit 52 and the movable unit 53, thereby manufacturing the coil 35 from the covered wire material 63C and the covered wire material 63A.

[0056] In this embodiment, an example is shown in which the electric motor 12 is installed inside the sealed container 11 of the compressor 2 and drives the compression element 15 built into the compressor 2, but the electric motor 12 may also drive a machine other than the compression element 15 built into the compressor 2.

[0057] For comparison with the present embodiment, FIG. 10 shows the cross-sectional structure of a winding 70 in a conventional example. The winding 70 includes two covered wires, each of which includes a conductor wire with a different hardness and an insulating coating covering the conductor wire with a different hardness. Of the conductor wires with different hardnesses, the soft conductor wire and the hard conductor wire have the same wire diameter, and the insulating coating covering the conductor wire with a different hardness is also the same thickness. In other words, the winding 70 in the conventional example differs from the winding 60 in the first embodiment in that the insulating coating covering the conductor wire with a different hardness is the same thickness. This is described in detail below.

[0058] In the description of winding 70 in the conventional example, a copper conductor wire is referred to as conductor wire 71C, an aluminum conductor wire is referred to as conductor wire 71A, an insulating coating covering the periphery of conductor wire 71C is referred to as insulating coating 72C, an insulating coating covering the periphery of conductor wire 71A is referred to as insulating coating 72A, a covered wire material having conductor wire 71C and insulating coating 72C is referred to as covered wire material 73C, and a covered wire material having conductor wire 71A and insulating coating 72A is referred to as covered wire material 73A. In addition, the cross-sectional shapes of the covered wire material and the conductor wire are both circular, and the wire diameters of the covered wire material and the conductor wire are defined as the diameter of the circle.

[0059] The wire diameter 74C of the conductor 71C and the wire diameter 74A of the conductor 71A are, for example, 1.0 mm. The thickness 75C of the insulating coating 72C and the thickness 75A of the insulating coating 72A are, for example, 0.04 mm. In this case, the wire diameter 76C of the covered wire 73C is the sum of the wire diameter 74C of the conductor 71C and twice the thickness 75C of the insulating coating 72C, or 1.08 mm, and the wire diameter 76A of the covered wire 73A is also 1.08 mm.

[0060] When a conventional coil is formed by winding a mixture of coated wire material 73C and coated wire material 73A around each tooth portion 36, the holding portion 51 holds both coated wire material 73C and coated wire material 73A at the same time. Generally, the wire diameter 74C of conductor 71C and the wire diameter 74A of conductor 71A, as well as the thickness of the insulating coating surrounding each wire, are made the same to prevent gaps from occurring between each wire and the holding portion 51 due to differences in wire diameter 76C of coated wire material 73C and wire diameter 76A of coated wire material 73A. However, because the hardness of each conductor wire is different, there is a difference in the amount of deformation of each conductor wire due to the gripping force of gripping portion 51, and there is also a difference in the contact between each wire and gripping portion 51. For this reason, there is a risk that each wire will easily come out of gripping portion 51, causing the winding to become distorted. Therefore, if the gripping force of gripping portion 51 is increased to prevent winding irregularities, the gripping force of gripping portion 51 will cause an indentation in conductor 71A, which is softer than conductor 71C, and greater stress will be generated in the cross section of conductor 71A where an indentation has occurred than in the cross section of conductor 71A where an indentation has not occurred, making conductor 71A more susceptible to breakage than in a case where an indentation has not occurred. In addition to the problem of wire 71A being prone to breakage as described above, when the gripping force of gripping portion 51 is increased, the contact area between gripping portion 51 and the insulating coating of each wire becomes larger on the surface of insulating coating 72A than on the surface of insulating coating 72C, and insulating coating 72A is therefore more widely affected by the gripping force of gripping portion 51 than insulating coating 72C. As a result, when gripping portion 51 of gripping portion 51 comes into contact with the surface of the insulating coating and is affected by the gripping force of gripping portion 51, deformation and scratches occur on the surface, which can lead to indentations and cracks, making it difficult to ensure the dielectric strength of insulating coating 72A.

[0061] In stator 30 of embodiment 1, thickness 65A of insulating coating 62A is thicker than thickness 65C of insulating coating 62C, resulting in a difference between thickness 65A of insulating coating 62A and thickness 65C of insulating coating 62C. Meanwhile, conductor 61A is softer than conductor 61C, so when covered wire 63C and covered wire 63A are simultaneously held, the amount of deformation of conductor 61A is greater than the amount of deformation of conductor 61C, resulting in a difference in the amount of deformation between conductor 61C and conductor 61A. Because the difference in the amount of deformation is offset by the difference in thickness, there is less difference in the contact between each wire and holding portion 51 compared to the conventional example. As a result, each wire is less likely to come out of holding portion 51, and winding irregularities can be suppressed. Furthermore, because each wire is less likely to come out of gripping portion 51, there is no need to increase the gripping force of gripping portion 51, which can prevent indentations from occurring in conductor 61A due to an increase in the gripping force of gripping portion 51, making conductor 61A less likely to break. In addition, the increase in gripping force of gripping portion 51 prevents indentations and cracks from occurring in the insulating coating surrounding each wire, which can prevent a decrease in dielectric strength.

[0062] Stator 30 of the first embodiment is also effective when the gripping force of gripping portions 51 is increased to further prevent winding irregularities. When the gripping force of gripping portions 51 is increased, the contact area of ​​gripping portions 51 becomes larger on the surface of insulating coating 62A than on the surface of insulating coating 62C, and therefore insulating coating 62A is affected by the gripping force of gripping portions 51 over a wider area than insulating coating 62C. Therefore, when gripping portions 51 come into contact with the surface of insulating coating 62A and the surface is affected by the gripping force of gripping portions 51, deformation or scratches occur on the surface, which can lead to indentations or cracks. As a result, the dielectric strength of insulating coating 62A may be reduced. Here, because insulating coating 62A is thicker by the difference in thickness, the dielectric strength of insulating coating 62A is ensured compared to the conventional example, even if the surface of insulating coating 62A is deformed or scratched, causing indentations or cracks. In this way, coil 35 is less susceptible to breakage of conducting wire 61A and the dielectric strength of insulating coating 62A is ensured, thereby preventing short circuits and burnout in coil 35.

[0063] The stator 30 of the first embodiment includes a cylindrical stator core 34, a first coated wire having an insulating coating covering the first conductor and the first conductor, the first conductor being harder than the second conductor, and a second coated wire having an insulating coating covering the second conductor that is thicker than the insulating coating covering the second conductor and the first conductor. The first coated wire and the second coated wire are wound around a plurality of teeth 36 arranged around the circumferential direction of the stator core 34, thereby suppressing the occurrence of short circuits and burnout in the coil 35.

[0064] The electric motor 12 of the first embodiment comprises a cylindrical stator core 34, a first coated wire having an insulating coating covering the first conductor and the first conductor, the first conductor being harder than the second conductor, and a second coated wire having an insulating coating covering the second conductor that is thicker than the insulating coating covering the second conductor and the first conductor, the first coated wire and the second coated wire being mixed and wound around a plurality of teeth 36 arranged around the stator core 34, and a rotor 31 that rotates using the magnetic field generated by the stator 30, so that the occurrence of short circuits and burnout in the coils 35 can be suppressed.

[0065] The compressor 2 of the first embodiment includes a cylindrical stator core 34, a first covered wire having an insulating coating covering the first conductor and the first conductor, the first conductor being harder than the second conductor among first and second conductors having different hardnesses, and a second covered wire having an insulating coating covering the second conductor and having a thickness thicker than the insulating coating covering the second conductor. The first covered wire and the second covered wire are provided with a plurality of teeth 3 arranged along the circumferential direction of the stator core 34. 6 and 7, and a rotor 31 that rotates using the magnetic field generated by the stator 30; a sealed container 11 that has an intake pipe 16 for drawing in fluid and a discharge pipe 17 for discharging the fluid; and a compression element 15 that is driven by the motor 12, compresses the fluid drawn in through the intake pipe 16, and discharges the compressed fluid through the discharge pipe 17, thereby preventing short circuits and burnout in the coil 35.

[0066] The refrigeration cycle device 1 of the first embodiment includes a cylindrical stator core 34, a first covered wire having an insulating coating covering the first conductor and the first covered wire, the first conductor being harder than the second conductor of first and second conductors having different hardnesses, and a second covered wire having an insulating coating covering the second conductor and thicker than the insulating coating covering the second conductor, the second covered wire and the second covered wire being thicker than the insulating coating covering the first conductor, and the first covered wire and the second covered wire are wound around a plurality of teeth 36 provided along the circumferential direction of the stator core 34 in a mixed manner. the compressor includes an electric motor 12 having a rotor 31 that rotates using a magnetic field generated by the rotor 31, an airtight container 11 having a suction pipe 16 for drawing in a fluid and a discharge pipe 17 for discharging the fluid, a compressor 2 having a compression element 15 that is driven by the electric motor 12 and compresses the fluid drawn in through the suction pipe 16 and discharges the compressed fluid through the discharge pipe 17, a condenser 3 that liquefies the fluid, a pressure reducing device 4 that reduces the pressure of the compressed fluid, and an evaporator 5 that vaporizes the fluid, thereby making it possible to suppress the occurrence of short circuits and burnout in the coil 35.

[0067] The manufacturing method of the stator 30 of the first embodiment includes the steps of producing a first coated wire material having an insulating coating covering the first conductor and the first conductor, the first conductor being harder than the second conductor, and a second coated wire material having an insulating coating covering the second conductor, the insulating coating being thicker than the insulating coating covering the second conductor and the first conductor, and winding the first coated wire material and the second coated wire material in a mixed manner around a plurality of teeth 36 arranged along the circumferential direction of the cylindrical stator core 34, thereby making it possible to suppress the occurrence of short circuits and burnout in the coils 35.

[0068] Embodiment 2 11, winding 80 includes two covered wires, each of which includes a conductor wire with a different hardness and an insulating coating covering the conductor wire with a different hardness. Of the conductor wires with different hardness, the soft conductor wire has a larger wire diameter than the hard conductor wire, and the insulating coating covering the soft conductor wire is thicker than the insulating coating covering the hard conductor wire. In other words, winding 80 according to the second embodiment differs from winding 60 according to the first embodiment in that, of the conductor wires with different hardness, the soft conductor wire has a larger wire diameter than the hard conductor wire.

[0069] In the description of winding 80 in this embodiment, the copper conductor wire is referred to as conductor wire 81C, the aluminum conductor wire is referred to as conductor wire 81A, the insulating coating covering the periphery of conductor wire 81C is referred to as insulating coating 82C, the insulating coating covering the periphery of conductor wire 81A is referred to as insulating coating 82A, the covered wire material having conductor wire 81C and insulating coating 82C is referred to as covered wire material 83C, and the covered wire material having conductor wire 81A and insulating coating 82A is referred to as covered wire material 83A. In addition, the cross-sectional shapes of the covered wire material and the conductor wire are both circular, and the wire diameters of the covered wire material and the conductor wire are defined as the diameter of the circle.

[0070] The wire diameter 84C of the conductor 81C is, for example, 1.0 mm, and the wire diameter 84A of the conductor 81A is, for example, 1.05 mm. The thickness 85C of the insulating coating 82C is, for example, 0.04 mm, and the thickness 85A of the insulating coating 82A is, for example, 0.052 mm. In this case, the wire diameter 88C of the covered wire 83C is 1.08 mm, and the wire diameter 88A of the covered wire 83A is also 1.154 mm.

[0071] In addition to the effects of the first embodiment, the stator (not shown) of the second embodiment makes the conductor wire 81A less likely to break even when the gripping force of the gripping portion 51 is increased to prevent winding irregularities. If the gripping force of gripping portion 51 is increased to prevent winding irregularities, the gripping force of gripping portion 51 will cause an indentation in conductor 81A, which is softer than conductor 81C. The cross section of conductor 81A with the indentation will experience greater stress than the cross section of conductor 81A without the indentation. Here, since wire diameter 84A of conductor 81A in the present embodiment is larger than wire diameter 64A of conductor 61A in the first embodiment, the cross-sectional area of ​​conductor 81A where the indentation occurs will be larger. In other words, the stress generated in the cross section of conductor 81A is smaller than in the first embodiment, and as a result, conductor 81A is less likely to break. In this way, the coil of the present embodiment is less likely to break conductor 81A and the dielectric strength of insulating coating 82A is ensured, thereby suppressing the occurrence of short circuits and burnout in the coil of the present embodiment.

[0072] Embodiment 3 As shown in Fig. 12, winding 90 includes two covered wires, each of which includes a conductor with a different hardness and an insulating coating covering the conductor with a different hardness. Of the conductors with different hardness, the soft conductor has a smaller wire diameter than the hard conductor, the insulating coating covering the soft conductor is thicker than the insulating coating covering the hard conductor, and the two covered wires have the same wire diameter. In other words, winding 90 according to the third embodiment differs from winding 60 according to the first embodiment in that the two covered wires have the same wire diameter.

[0073] In the description of winding 90 in this embodiment, a copper conductor wire is referred to as conductor wire 91C, an aluminum conductor wire is referred to as conductor wire 91A, an insulating coating covering the periphery of conductor wire 91C is referred to as insulating coating 92C, an insulating coating covering the periphery of conductor wire 91A is referred to as insulating coating 92A, a covered wire material having conductor wire 91C and insulating coating 92C is referred to as covered wire material 93C, and a covered wire material having conductor wire 91A and insulating coating 92A is referred to as covered wire material 93A. In addition, the cross-sectional shapes of the covered wire material and the conductor wire are both circular, and the wire diameters of the covered wire material and the conductor wire are defined as the diameter of the circle.

[0074] The wire diameter 94C of the conductor 91C is, for example, 1.0 mm, and the wire diameter 94A of the conductor 91A is, for example, 0.976 mm. The thickness 95C of the insulating coating 92C is, for example, 0.04 mm, and the thickness 95A of the insulating coating 92A is, for example, 0.052 mm. In this case, the wire diameter 99C of the covered wire 93C is 1.08 mm, and the wire diameter 99A of the covered wire 93A is also 1.08 mm.

[0075] In the stator (not shown) of the third embodiment, thickness 95A of insulating coating 92A is thicker than thickness 95C of insulating coating 92C, resulting in a difference between thickness 95A of insulating coating 92A and thickness 95C of insulating coating 92C. If the gripping force of gripping portions 51 is increased to prevent winding irregularities, the contact area of ​​gripping portions 51 is larger on the surface of insulating coating 92A than on the surface of insulating coating 92C. Therefore, a wider area of ​​insulating coating 92A is affected by the gripping force of gripping portions 51 than on insulating coating 92C. As a result, contact with gripping portions 51 on the surface of the insulating coating and the effect of the gripping force of gripping portions 51 on the surface of the insulating coating can cause deformation or scratches on the surface, which can lead to indentations or cracks. As a result, the dielectric strength of the insulating coating can be reduced. Here, since insulating coating 92A is thicker by the difference in thickness, the dielectric strength of insulating coating 92A is ensured compared to the conventional example, even if the surface of insulating coating 92A is deformed or scratched, causing indentations or cracks. In this way, the coil of this embodiment has a guaranteed dielectric strength of insulating coating 92A, which makes it possible to prevent short circuits and burnout in the coil of this embodiment.

[0076] In the above-described embodiments, the materials, materials, dimensions, shapes, relative positions, and implementation conditions of each component may be described. However, these are merely examples in all respects and are not intended to limit the scope of each embodiment. Therefore, countless variations not exemplified are contemplated within the scope of each embodiment. For example, these include modifying, adding, or omitting any component, and even extracting at least one component from at least one embodiment and combining it with a component from another embodiment. [Explanation of symbols]

[0077] 1 refrigeration cycle device, 2 compressor, 12 electric motor, 30 stator, 35 coil, 60 winding

Claims

1. a cylindrical stator core; a first coated wire having an insulating coating covering the first conductive wire and the second conductive wire, the first conductive wire being harder than the second conductive wire, and a second coated wire having an insulating coating covering the second conductive wire, the insulating coating being thicker than the insulating coating covering the second conductive wire and the first conductive wire; Equipped with The first coated wire and the second coated wire are mixed and wound around a plurality of teeth provided along the circumferential direction of the stator core. Stator.

2. The cross-sectional area of ​​the second conducting wire is larger than the cross-sectional area of ​​the first conducting wire. The stator according to claim 1 .

3. The cross-sectional areas of the first coated wire and the second coated wire are equal. The stator according to claim 1 .

4. the first conducting wire is made of copper, the second conducting wire is made of aluminum, and the insulating coating covering the periphery of the first conducting wire and the insulating coating covering the periphery of the second conducting wire are made of any one of polyamideimide, polyesterimide, polyester, polyurethane, and formal; The stator according to any one of claims 1 to 3.

5. The cross-sectional shape of the first coated wire and the second coated wire is either circular or rectangular. The stator according to any one of claims 1 to 3.

6. A stator according to any one of claims 1 to 3; a rotor that rotates using the magnetic field generated by the stator; Equipped with Electric motor.

7. The electric motor according to claim 6; a sealed container having a suction pipe for suctioning a fluid and a discharge pipe for discharging the fluid; a compression element driven by the electric motor, compressing the fluid drawn in through the suction pipe and discharging the compressed fluid through the discharge pipe; Equipped with Compressor.

8. the fluid is a refrigerant; The refrigerant is at least one of HFC (Hydrofluorocarbon) refrigerants such as R32, R125, R134a, R407C, and R410A; HFO (Hydrofluoroolefin) refrigerants such as R1123, R1132(E), R1132(Z), R1132a, R1141, R1234yf, R1234ze(E), and R1234ze(Z); and natural refrigerants such as R290 (propane), R600a (isobutane), R744 (carbon dioxide), and R717 (ammonia). The compressor according to claim 7.

9. The compressor according to claim 8; a condenser for liquefying the fluid; a pressure reducing device for reducing the pressure of the compressed fluid; an evaporator for vaporizing the fluid; Equipped with Refrigeration cycle equipment.

10. a step of producing a first coated wire having an insulating coating covering the first conductive wire and the second conductive wire, the insulating coating being harder than the second conductive wire, and a second coated wire having an insulating coating covering the second conductive wire, the insulating coating being thicker than the insulating coating covering the second conductive wire and the first conductive wire; winding the first coated wire and the second coated wire in a mixed manner around a plurality of teeth provided along a circumferential direction of a cylindrical stator core; A method for manufacturing a stator, comprising:

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