Stator, electric motor, compressor, refrigeration cycle device, and winding method

Abstract

The present invention provides a stator comprising: a stator core having a core back part arranged in an annular shape and a teeth part protruding radially from the core back part; a coil in which a conductor wire is wound around the teeth part to form a plurality of layers; and insulators disposed on both end faces of the stator core to insulate the teeth part and the core back part from the coil, wherein the teeth part is disposed plurally in the circumferential direction and has a pair of first surfaces, which are surfaces where adjacent teeth parts face each other, and a pair of second surfaces, which are surfaces orthogonal to the pair of first surfaces, and the coil has a straight winding section in which the conductor wire is wound straight and pyramid-stacked in adjacent layers in a portion disposed opposite each of the pair of first surfaces, and a crossing section in which the conductor wire is wound obliquely on the teeth part at an angle to the radial direction and disposed such that the conductor wire crosses itself in adjacent layers of the conductor wire in a portion disposed opposite each of the pair of second surfaces.

Description

Stator, electric motor, compressor, refrigeration cycle device, and winding method

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

[0002] Conventionally, a stator of an electric motor is configured by arranging multiple stator cores, each of which is formed by winding a conductor around a laminated core with an insulating member interposed therebetween, in a circular arrangement and interconnecting the stator cores (see, for example, Patent Document 1). The stator of Patent Document 1 has a pair of first surfaces that form surfaces facing adjacent stator teeth with the insulating member interposed therebetween, and a pair of second surfaces that form surfaces perpendicular to the pair of first surfaces. In the stator of Patent Document 1, the conductor wire of the coil is arranged in an aligned winding on one of the pair of first surfaces and the pair of second surfaces, and the conductor wire is arranged in an oblique winding on the remaining second surface. In this way, the stator of Patent Document 1 winds the conductor wire in an aligned winding on three of the four surfaces and in an oblique winding on the remaining surface, thereby winding the conductor wire without leaving any unnecessary gaps on the surfaces of the teeth to form a multi-layer coil.

[0003] International Publication No. 2020 / 067556

[0004] However, in the stator of Patent Document 1, the conductor wires are wound back and forth along the extension direction of the teeth, so that on the second surface where the conductor wires are wound diagonally, the conductor wires are arranged so that the conductor wires cross each other in adjacent layers above and below. As a result, in the stator of Patent Document 1, the conductor wires arranged in multiple layers on the pair of first surfaces and one of the pair of second surfaces are arranged in a bale-like stacking manner, and the conductor wires arranged on the remaining second surface are arranged so that the conductor wires cross each other in adjacent layers above and below. In the stator where the conductor wires are arranged in a bale-like stacking manner, the stack height of the conductor wires can be reduced, while in the case where the conductor wires are arranged so that they cross each other, the stack height of the conductor wires becomes high. Therefore, in the stator of Patent Document 1, the conductor wire portions on the second surface where the conductor wires are wound in an aligned manner and the conductor wire portions on the second surface where the conductor wires are wound diagonally are unbalanced in length and arrangement, which may prevent the generation of a suitable magnetic field.

[0005] The present disclosure is intended to solve the above-mentioned problems, and aims to provide a stator of an electric motor, an electric motor, a compressor, a refrigeration cycle device, and a winding method that can form a suitable magnetic field.

[0006] The stator according to the present disclosure is a stator used in an electric motor, and comprises a stator core having a core back portion arranged in an annular ring and teeth portions protruding radially from the core back portion, coils configured so that a conductor having a circular cross section is wound around the teeth portions to form multiple layers, and insulators arranged on both end faces of the stator core in the axial direction of the stator to insulate the teeth portions and the core back portion from the coil, wherein a plurality of teeth portions are arranged in the circumferential direction of the stator, and each have a pair of first faces where adjacent teeth portions face each other, and a pair of second faces which are faces perpendicular to the pair of first faces, and the coil has aligned winding portions in which the conductor wire is aligned and stacked in adjacent layers in a row in a portion arranged opposite each of the pair of first faces, and intersection portions in which the conductor wire is wound diagonally around the teeth portions at an angle to the radial direction and arranged so that adjacent layers of the conductor wire cross each other in a portion arranged so as to face each of the pair of second faces.

[0007] The electric motor according to the present disclosure includes a stator having the above-described configuration and a rotor that is provided inside the stator and rotates by magnetic action.

[0008] The compressor according to the present disclosure includes an electric motor having the above-described configuration, a compression mechanism driven by the electric motor and compressing fluid drawn in from the outside, and a sealed container accommodating the electric motor and the compression mechanism.

[0009] The refrigeration cycle device according to the present disclosure includes a compressor having the above-described configuration, an outdoor heat exchanger that exchanges heat between outdoor air and the refrigerant flowing inside, a pressure reducing device that reduces the pressure of the refrigerant flowing inside, and an indoor heat exchanger that exchanges heat between indoor air and the refrigerant flowing inside.

[0010] The winding method according to the present disclosure is a winding method for a stator used in an electric motor, and includes a stator core having a core back portion arranged in an annular shape and teeth portions protruding radially from the core back portion, a coil configured to form multiple layers by winding a conductor having a circular cross section around the teeth portions, and insulators arranged on both end faces of the stator core in the axial direction of the stator to insulate the teeth portions and core back portion from the coil, wherein a plurality of teeth portions are arranged circumferentially on the stator, and a pair of first surfaces on which adjacent teeth portions face each other; and a pair of second surfaces that are perpendicular to the pair of first surfaces, and the coil has aligned winding portions in which the conductor wire is aligned and stacked in adjacent layers in portions arranged to face each of the pair of first surfaces, and crossing portions in which the conductor wire is wound obliquely around the teeth in portions arranged to face each of the pair of second surfaces and stacked in adjacent layers in portions arranged to face each of the pair of second surfaces, wherein the conductor wire is wound obliquely with respect to the radial direction around the teeth and stacked in adjacent layers in portions arranged to face each of the pair of second surfaces. In this winding method for a stator, when winding the conductor wire around one of the pair of first surfaces, a first step in which the conductor is wound around the teeth by regular winding; a second step in which, when winding the conductor around one of the pair of second surfaces, the conductor is wound around the teeth by oblique winding, in which the conductor is wound around the teeth at an angle to the radial direction of the stator; a third step in which, when winding the conductor around the other of the pair of first surfaces, the conductor is wound around the teeth by regular winding; and a third step in which, when winding the conductor around the other of the pair of second surfaces, the conductor is wound around the teeth by oblique winding, in which the conductor is wound around the teeth at an angle to the radial direction of the stator. and a fourth step of repeating the first step, the second step, the third step, and the fourth step to form a coil, the first step and the third step including steps of forming an aligned winding portion in which the conductor wire is aligned and stacked in adjacent layers in the coil portions facing each of the pair of first surfaces, and the second step and the fourth step including steps of forming an obliquely wound portion in which the conductor wire is wound around the teeth obliquely with respect to the radial direction in the coil portions facing each of the pair of second surfaces, and crossing portions in which the conductor wire crosses in adjacent layers.

[0011] In the stator, electric motor, compressor, refrigeration cycle device, and winding method according to the present disclosure, the stator coil has intersections in portions that face each of a pair of second surfaces of the tooth portion. The intersections are portions where the conductor wires are obliquely wound and arranged so that the conductor wires cross each other between adjacent layers. The stator has intersections on both of the pair of second surfaces, rather than on only one of the pair of second surfaces. Therefore, compared to when the stator has intersections on only one of the pair of second surfaces, the stator can balance the lengths and arrangements of the conductor wires in the portions of the pair of second surfaces, suppressing magnetic imbalance and enabling the formation of a favorable magnetic field.

[0012] 7 is a longitudinal sectional view of a compressor according to an embodiment; FIG. 8 is a conceptual diagram of a cross section of a compression mechanism taken along line A-A in FIG. 1 in a compressor according to an embodiment, viewed in the direction of the arrows; FIG. 9 is a schematic configuration diagram of a refrigeration cycle device such as an air conditioner to which a compressor according to an embodiment is connected; FIG. 10 is a conceptual diagram of a cross section of an electric motor taken along line B-B in FIG. 1 in a compressor according to an embodiment, viewed in the direction of the arrows; FIG. 11 is a configuration diagram of a stator core of a stator used in an electric motor of a compressor according to an embodiment; FIG. 12 is a configuration diagram of a stator core and insulating members of a stator used in an electric motor of a compressor according to an embodiment; FIG. 13 is a plan view of a stator constituting an electric motor of a compressor according to an embodiment; FIG. 14 is a cross section of the stator taken along line C-C in FIG. 7, viewed in the direction of arrow A; FIG. 15 is a cross section of the stator taken along line C-C in FIG. 7, viewed in the direction of arrow B; FIG. 16 is a plan view of a stator including a coil constituting an electric motor of a compressor according to an embodiment; FIG. 17 is a configuration diagram of a stator according to an embodiment.

[0013] Hereinafter, a stator, an electric motor, a compressor, a refrigeration cycle device, and a winding method according to embodiments will be described with reference to the drawings. Note that in the following drawings, including FIG. 1, the relative dimensional relationships and shapes of the components may differ from those in reality. Furthermore, in the following drawings, identical reference numerals denote identical or equivalent components, and this applies throughout the entire specification. To facilitate understanding, terms indicating directions (e.g., "up," "down," "right," "left," "front," "rear," etc.) are used as appropriate, but these notations are merely used for the convenience of explanation and do not limit the arrangement or orientation of the device or components.

[0014] Embodiment [Configuration of Compressor 100] Fig. 1 is a longitudinal cross-sectional view of a compressor 100 according to an embodiment. The compressor 100, which is a hermetic compressor, will be described using Fig. 1. The compressor 100 draws in a low-temperature, low-pressure refrigerant, compresses the drawn refrigerant, and discharges a high-temperature, high-pressure refrigerant.

[0015] The compressor 100 is a single-cylinder rotary compressor, and is a fluid machine that discharges low-pressure gas refrigerant drawn into the compressor 100 as high-pressure gas refrigerant. The single-cylinder rotary compressor is an example of the compressor 100, and the compressor 100 may have any compression structure, such as a scroll type or a reciprocating type, as long as it is a hermetic compressor in which the electric motor 30 is disposed inside the hermetic container 10.

[0016] The compressor 100 includes an electric motor 30, a compression mechanism 20 that is driven by the electric motor 30 and compresses fluid drawn in from the outside, and a sealed container 10 that houses the electric motor 30 and the compression mechanism 20. The compressor 100 houses the compression mechanism 20 that compresses refrigerant gas and the electric motor 30 that drives the compression mechanism 20 within the sealed container 10. The sealed container 10 is composed of an upper container 11 and a lower container 12, and forms the outer shell of the compressor 100. The compressor 100 has the compression mechanism 20 housed in a lower portion within the sealed container 10, and the electric motor 30 housed in an upper portion within the sealed container 10.

[0017] In the compressor 100, a compression mechanism 20 and an electric motor 30 are connected by a rotary shaft 21. The rotary shaft 21 transmits the rotational motion of the electric motor 30 to the compression mechanism 20. In the compression mechanism 20, the refrigerant gas is compressed by the rotational force of the electric motor 30 transmitted by the rotary shaft 21, and the compressed refrigerant gas is discharged into the sealed container 10. The sealed container 10 is filled with compressed refrigerant gas at a high temperature and high pressure. Refrigeration oil is stored in the lower portion, i.e., the bottom, of the sealed container 10 to lubricate the compression mechanism 20.

[0018] The compressor 100 is provided with an oil pump (not shown) that pumps up refrigeration oil at the bottom of the rotating shaft 21. As the rotating shaft 21 rotates, the oil pump draws up refrigeration oil stored at the bottom of the sealed container 10 and supplies it to each sliding part of the compression mechanism 20. This ensures mechanical lubrication of the compression mechanism 20 in the compressor 100.

[0019] The rotating shaft 21 has a main shaft portion 21a, an eccentric shaft portion 21b, and a counter shaft portion 21c. The main shaft portion 21a, the eccentric shaft portion 21b, and the counter shaft portion 21c are provided in this order in the axial direction of the rotating shaft 21 from the side where the electric motor 30 is disposed toward the side where the compression mechanism 20 is disposed. In the compressor 100, the electric motor 30 is fixed to the main shaft portion 21a by shrink fitting or press fitting, and a cylindrical rolling piston 22, which will be described later, is slidably fitted to the eccentric shaft portion 21b.

[0020] (Compression mechanism 20) Figure 2 is a conceptual diagram of a cross section of the compression mechanism 20 taken along line A-A in Figure 1 in the direction of the arrows in the compressor 100 according to this embodiment. The compression mechanism 20 will be described using Figures 1 and 2. The compression mechanism 20 is operated by the electric motor 30 and compresses fluid drawn in from the outside. The compression mechanism 20 uses the rotational driving force supplied from the electric motor 30 to compress low-pressure refrigerant gas drawn into a low-pressure space in the cylinder 23 of the compression mechanism 20 from the suction connecting pipe 113 into high-pressure refrigerant gas, and discharges the compressed high-pressure refrigerant gas above the compression mechanism 20.

[0021] The compression mechanism 20 has a cylinder 23, a rolling piston 22, an upper bearing 24, a lower bearing 25, and a vane 26. As shown in Fig. 2, the compression mechanism 20 is provided with the cylinder 23 having a hollow cylindrical shape. The cylinder 23 is formed in a cylindrical shape with both ends open in the axial direction of the rotary shaft 21. A cylinder chamber 23a is formed inside the cylinder 23.

[0022] The cylinder chamber 23a accommodates an eccentric shaft portion 21b of the rotary shaft 21 that performs eccentric motion inside the cylinder chamber 23a, and a rolling piston 22 that is fitted onto the eccentric shaft portion 21b of the rotary shaft 21. The cylinder chamber 23a also accommodates a vane 26 that partitions the space formed between an inner peripheral wall 23a1 of the cylinder chamber 23a and an outer peripheral wall 22a of the rolling piston 22.

[0023] A vane groove 23c is formed in the cylinder 23. The vane groove 23c is a groove that extends in the radial direction of the cylinder 23. One end of the vane groove 23c in the radial direction of the cylinder 23 opens into the cylinder chamber 23a and communicates with the cylinder chamber 23a, and the other end is provided with a back pressure chamber 23b. A vane 26 is housed in the vane groove 23c.

[0024] The vane 26 is arranged to reciprocate radially within the vane groove 23 c. When attached to the vane groove 23 c, the vane 26 has a substantially rectangular parallelepiped shape whose thickness in the circumferential direction of the cylinder chamber 23 a is smaller than the radial and axial lengths of the cylinder chamber 23 a.

[0025] A vane spring (not shown) is provided in the back pressure chamber 23b of the vane groove 23c. In the compression mechanism 20, high-pressure refrigerant gas inside the sealed container 10 flows into the back pressure chamber 23b, and a pressure difference between the pressure of the refrigerant gas in the back pressure chamber 23b and the pressure of the refrigerant gas in the cylinder chamber 23a generates a force that moves the vane 26 radially toward the center of the cylinder chamber 23a. In the compression mechanism 20, the force due to the pressure difference between the back pressure chamber 23b and the cylinder chamber 23a and the radial pressing force of the vane spring move the vane 26 radially toward the center of the cylinder chamber 23a.

[0026] The force that moves the vane 26 in the radial direction causes one end of the vane 26, i.e., the end on the cylinder chamber 23a side, to abut against the cylindrical outer peripheral wall 22a of the rolling piston 22. This allows the vane 26 to separate the space formed by the inner peripheral wall 23a1 of the cylinder 23 and the outer peripheral wall 22a of the rolling piston 22.

[0027] In the compressor 100, there are cases where the pressure of the refrigerant gas inside the sealed container 10, i.e., the pressure difference between the pressure of the refrigerant gas in the back pressure chamber 23b and the pressure of the refrigerant gas inside the cylinder chamber 23a, is not sufficient to press the vane 26 against the outer peripheral wall 22a of the rolling piston 22. Even in such cases, the compression mechanism 20 can press one end of the vane 26 against the outer peripheral wall 22a of the rolling piston 22 using the force of the vane spring, so that one end of the vane 26 can always abut against the outer peripheral wall 22a of the rolling piston 22. In the compression mechanism 20, one end of the vane 26, which reciprocates radially within the vane groove 23c provided in the cylinder 23, abuts against the outer peripheral wall 22a of the rolling piston 22, thereby forming a compression chamber.

[0028] Openings at both axial ends of the hollow cylindrical cylinder 23 are closed by an upper bearing 24 and a lower bearing 25. In the cylinder chamber 23a of the compression mechanism 20, the space surrounded by the rolling piston 22, the cylinder 23, the vane 26, the upper bearing 24, and the lower bearing 25 forms a compression chamber that compresses the low-pressure gas refrigerant sucked from the suction connecting pipe 113.

[0029] The upper bearing 24 is fitted onto the main shaft portion 21 a of the rotary shaft 21 to rotatably support the main shaft portion 21 a, and closes one axial opening of the cylinder chamber 23 a. Similarly, the lower bearing 25 is fitted onto the counter shaft portion 21 c of the rotary shaft 21 to rotatably support the counter shaft portion 21 c, and closes one axial opening of the cylinder chamber 23 a.

[0030] The cylinder 23 is provided with a suction port 23e that draws refrigerant gas into the cylinder chamber 23a from outside the sealed container 10, and the upper bearing 24 is provided with a discharge port (not shown) that discharges the compressed refrigerant gas to the outside of the cylinder chamber 23a. The upper bearing 24 is substantially inverted T-shaped in side view, and the lower bearing 25 is substantially T-shaped in side view.

[0031] A discharge valve (not shown) is provided in a discharge port (not shown) of the upper bearing 24. The discharge valve controls the timing of discharge of high-temperature, high-pressure refrigerant gas discharged through the discharge port from the cylinder 23. The discharge valve closes until the refrigerant gas compressed inside the cylinder chamber 23a of the cylinder 23 reaches a predetermined pressure, and opens when the refrigerant gas inside the cylinder chamber 23a reaches or exceeds the predetermined pressure, thereby discharging the high-temperature, high-pressure refrigerant gas to the outside of the cylinder chamber 23a.

[0032] The refrigerant gas is repeatedly drawn, compressed, and discharged from the cylinder chamber 23a. Therefore, the refrigerant gas is intermittently discharged from the discharge port, which may generate noise such as pulsating sounds. To reduce noise caused by the refrigerant gas, the compression mechanism 20 has a discharge muffler 27 attached to the outer side of the upper bearing 24, i.e., on the motor 30 side of the upper bearing 24, so as to cover the upper bearing 24.

[0033] The discharge muffler 27 is provided with a discharge hole (not shown) that connects the space formed by the discharge muffler 27 and the upper bearing 24 with the internal space of the sealed container 10. The refrigerant gas discharged from the cylinder 23 through the discharge port is first discharged into the space formed by the discharge muffler 27 and the upper bearing 24, and then discharged from the discharge hole of the discharge muffler 27 into the internal space of the sealed container 10. The discharged refrigerant gas cools the windings as it flows toward a discharge pipe 102 provided at the top of the sealed container 10 and passes through a gap between the windings of the stator 41 and the sealed container 10.

[0034] (Motor 30) The motor 30 is disposed inside the sealed container 10 and is used to drive the compression mechanism 20. The motor 30 is a motor that generates a rotational driving force in the rotating shaft 21 using power supplied from an external power source and transmits the rotational driving force to the compression mechanism 20 via the rotating shaft 21. The motor 30 may be, for example, a brushless DC motor.

[0035] The electric motor 30 includes a stator 41 having a hollow cylindrical appearance when viewed from above, and a rotor 31 that is rotatably disposed inside the stator 41 and rotates by magnetic action. The stator 41 is formed by laminating stator core sheets that are formed by punching thin electromagnetic steel sheets. The core that forms the stator 41 has, for example, an outer diameter larger than the inner diameter of the lower casing 12, and is fixed to the inner wall of the lower casing 12 by shrink fitting.

[0036] The lead wires 37 of the stator 41 are connected to a glass terminal 38 provided on the upper vessel 11 to supply power from outside the sealed vessel 10. The glass terminal 38 provides an interface for connection to an external power source. In the electric motor 30, power supplied from the external power source is supplied to a wound coil 47 (described later, see FIG. 4 ) constituting the stator 41 via the lead wires 37, thereby causing the rotor 31 to rotate inside the stator 41.

[0037] Like the stator 41, the rotor 31 is formed by laminating rotor core sheets formed by punching thin electromagnetic steel sheets. A rotating shaft 21 is fixed to the center of the rotor 31. The rotating shaft 21 passes through the rotor 31 in the axial direction. The rotating shaft 21 transmits the rotational driving force of the rotor 31 to the compression mechanism 20. The inner diameter of the rotor 31 is smaller than the outer diameter of the rotating shaft 21, and the rotor 31 is fixed to the rotating shaft 21 by shrink fitting. The detailed structure of the electric motor 30 will be described later.

[0038] The rotating shaft 21 has an eccentric shaft portion 21b that is arranged at a position corresponding to the cylinder 23 inside the compression mechanism 20. A substantially cylindrical rolling piston 22 that is rotatably attached along the outer surface of the eccentric shaft portion 21b is arranged on the outer periphery of the eccentric shaft portion 21b. When the rotating shaft 21 is rotated by the electric motor 30, the rolling piston 22 rotates inside the cylinder 23 along its inner circumferential wall 23a1.

[0039] A suction muffler 101 is disposed outside the sealed container 10. The suction muffler 101 is provided on the side of the sealed container 10 to prevent liquid refrigerant from being directly drawn into the cylinder chamber 23a of the cylinder 23. Generally, a mixture of low-pressure refrigerant gas and liquid refrigerant is sent to the compressor from an external refrigerant circuit to which the compressor is connected. If the liquid refrigerant flows into the cylinder and is compressed by the compression mechanism, it may cause a malfunction of the compression mechanism.

[0040] The compressor 100 separates the liquid refrigerant from the refrigerant gas in the suction muffler 101 and sends only the refrigerant gas from the suction muffler 101 to the cylinder chamber 23a. The suction muffler 101 is connected to the suction port 23e of the cylinder 23 by the suction connecting pipe 113. That is, the suction muffler 101 is connected to the cylinder 23 of the compression mechanism 20 by the suction connecting pipe 113. The low-pressure refrigerant gas sent from the suction muffler 101 is drawn into the cylinder chamber 23a via the suction connecting pipe 113 and the suction port 23e.

[0041] A discharge pipe 102 is fixed to the top surface of the upper vessel 11 constituting the sealed vessel 10, passing through the upper vessel 11. The discharge pipe 102 is a refrigerant pipe that discharges high-pressure gas refrigerant to the outside of the sealed vessel 10. The fixed portion between the discharge pipe 102 and the upper vessel 11 is joined by, for example, brazing or resistance welding.

[0042] [Operation of Compressor 100] Next, the operation of the compressor 100 of this embodiment will be described. When the rotating shaft 21 is rotated by operation of the electric motor 30, the rotational movement of the rotating shaft 21 causes the eccentric shaft portion 21b of the rotating shaft 21 to rotate inside the cylinder chamber 23a of the cylinder 23. When the rotating shaft 21 is rotated by operation of the electric motor 30, the eccentric shaft portion 21b and the rolling piston 22 housed inside the cylinder 23 rotate eccentrically together with the rotating shaft 21. Due to the eccentric rotation of the eccentric shaft portion 21b and the rolling piston 22, the outer peripheral wall 22a of the rolling piston 22 moves in contact with the inner peripheral wall 23a1 of the cylinder 23 in the cylinder chamber 23a of the cylinder 23.

[0043] A vane 26 disposed inside a vane groove 23c formed in the cylinder 23 performs piston-like motion in conjunction with the eccentric rotation of the rolling piston 22 inside the cylinder 23. Low-pressure gas refrigerant flowing into the compression mechanism 20 from the suction connecting pipe 113 flows into a compression chamber, which is an enclosed space surrounded by the rolling piston 22, the cylinder 23, the vane 26, the upper bearing 24, and the lower bearing 25. The low-pressure gas refrigerant flowing into the compression chamber is compressed to high-pressure gas refrigerant as the volume of the compression chamber decreases due to the eccentric rotation of the rolling piston 22.

[0044] The volume of the compression chamber, defined by the inner peripheral wall 23a1 of the cylinder chamber 23a, the outer peripheral wall 22a of the rolling piston 22 fitted to the eccentric shaft portion 21b, the upper bearing 24, the lower bearing 25, and the vane 26, increases and then decreases as the rotary shaft 21 rotates. First, the compression chamber communicates with the suction port 23e of the compressor 100, and low-pressure refrigerant gas is drawn into the suction muffler 101 via the suction connecting pipe 113. Next, the eccentric rotation of the rolling piston 22 closes the communication between the compression chamber and the suction port 23e, compressing the refrigerant gas within the compression chamber as the volume of the compression chamber decreases. Finally, the compression chamber communicates with the discharge port, and after the refrigerant gas within the compression chamber reaches a predetermined pressure, a discharge valve provided at the discharge port opens, and the compressed, high-pressure, high-temperature refrigerant gas is discharged from the compression chamber, i.e., the cylinder chamber 23a.

[0045] The high-pressure gas refrigerant is discharged into the internal space of the sealed container 10 outside the compression mechanism 20 through a discharge port provided in the upper bearing 24 and a discharge hole provided in the discharge muffler 27. The high-pressure and high-temperature refrigerant gas discharged from the cylinder chamber 23a through the discharge muffler 27 into the internal space of the sealed container 10 passes through the inside of the electric motor 30, rises inside the sealed container 10, and is discharged to the outside of the sealed container 10 from a discharge pipe 102 provided at the top of the sealed container 10. A refrigerant circuit through which the refrigerant flows is configured outside the sealed container 10, and the refrigerant discharged from the compressor 100 circulates through the refrigerant circuit and returns to the compressor 100 again through the suction muffler 101.

[0046] [Configuration of Refrigeration Cycle Apparatus 200] Figure 3 is a schematic diagram of a refrigeration cycle apparatus 200, such as an air conditioner, to which a compressor 100 according to an embodiment is connected. The refrigeration cycle apparatus 200 includes the compressor 100, an outdoor heat exchanger 104 that exchanges heat between outdoor air and the refrigerant flowing therethrough, a pressure reducing device 105 that reduces the pressure of the refrigerant flowing therethrough, and an indoor heat exchanger 106 that exchanges heat between indoor air and the refrigerant flowing therethrough. The refrigeration cycle apparatus 200 may also include a flow path switching device 103. The refrigeration cycle apparatus 200 also includes an intake muffler 101 that is connected to the intake side of the compressor 100. While it is desirable for the refrigeration cycle apparatus 200 to include the intake muffler 101, the refrigeration cycle apparatus 200 does not necessarily need to include the intake muffler 101.

[0047] In the refrigeration cycle apparatus 200, a compressor 100, a flow path switching device 103, an outdoor heat exchanger 104, a pressure reducing device 105, and an indoor heat exchanger 106 are connected in sequence via refrigerant piping to form a refrigerant circuit 201 through which the refrigerant circulates. Note that in the refrigeration cycle apparatus 200 such as an air conditioner, the indoor heat exchanger 106 is often mounted in a device located indoors, and the compressor 100, flow path switching device 103, the outdoor heat exchanger 104, the pressure reducing device 105, etc. are often mounted in a device located outdoors.

[0048] The flow path switching device 103 is, for example, a four-way valve, and switches the flow direction of the refrigerant. The flow path switching device 103 is connected to the discharge side of the compressor 100. The outdoor heat exchanger 104 exchanges heat between the outdoor air and the refrigerant flowing inside the outdoor heat exchanger 104. The outdoor heat exchanger 104 functions as a condenser or an evaporator depending on the flow direction of the refrigerant. The pressure reducing device 105 reduces the pressure of the refrigerant that flows out of the condenser and into the pressure reducing device 105 and flows inside the pressure reducing device 105.

[0049] The pressure reducing device 105 is, for example, an electronic expansion valve that can adjust the aperture of a throttle, and controls the pressure of the refrigerant flowing into the outdoor heat exchanger 104 or the indoor heat exchanger 106 by adjusting the aperture. The indoor heat exchanger 106 exchanges heat between the indoor air and the refrigerant flowing inside the indoor heat exchanger 106. The indoor heat exchanger 106 functions as an evaporator or a condenser depending on the direction of refrigerant flow. The refrigeration cycle apparatus 200 may include an outdoor fan (not shown) that sends outdoor air to the outdoor heat exchanger 104, or may include an outdoor fan (not shown) that sends indoor air to the indoor heat exchanger 106.

[0050] [Operation of the refrigeration cycle apparatus 200] The operation of the refrigeration cycle apparatus 200 when the refrigeration cycle apparatus 200 is an air conditioner and the air conditioner is performing heating operation will be described. During heating operation of the air conditioner, the flow path switching device 103 connects the pipes connected to the flow path switching device 103 to form a circuit on the solid line side in Fig. 3. In the refrigeration cycle apparatus 200, the discharge pipe 102 of the compressor 100 is connected to the indoor heat exchanger 106, and the suction connecting pipe 113 of the compressor 100 is connected to the outdoor heat exchanger 104.

[0051] The high-temperature, high-pressure refrigerant compressed by the compressor 100 flows into the indoor heat exchanger 106, where it condenses and liquefies, and then flows out of the indoor heat exchanger 106 and into the pressure reducing device 105, where it is throttled and becomes a low-temperature, low-pressure, two-phase gas-liquid refrigerant. The low-temperature, low-pressure, two-phase refrigerant throttled in the pressure reducing device 105 flows into the outdoor heat exchanger 104, where it evaporates and gasifies, and after flowing out of the outdoor heat exchanger 104, passes through the flow switching device 103 and returns to the compressor 100.

[0052] That is, when the refrigeration cycle device 200 is an air conditioner and the air conditioner is in heating operation, the refrigerant circulates through the refrigerant circuit 201 as shown by the solid arrows in Fig. 3. This circulation of the refrigerant causes heat exchange between the outside air and the refrigerant in the outdoor heat exchanger 104, which serves as an evaporator, and the refrigerant sent to the outdoor heat exchanger 104 absorbs heat, and the refrigerant that has absorbed heat is sent to the indoor heat exchanger 106, which serves as a condenser, where it exchanges heat with the indoor air and warms the indoor air.

[0053] The operation of the refrigeration cycle apparatus 200 when the refrigeration cycle apparatus 200 is an air conditioner and the air conditioner is in cooling operation will be described. During cooling operation of the air conditioner, the flow path switching device 103 connects the pipes connected to the flow path switching device 103 to form a circuit on the dashed line side in Fig. 3. In the refrigeration cycle apparatus 200, the discharge pipe 102 of the compressor 100 is connected to the outdoor heat exchanger 104, and the suction connecting pipe 113 of the compressor 100 is connected to the indoor heat exchanger 106.

[0054] The high-temperature, high-pressure refrigerant compressed by the compressor 100 flows into the outdoor heat exchanger 104, where it condenses and liquefies, and after flowing out of the outdoor heat exchanger 104, flows into the pressure reducing device 105, where it is throttled and becomes a low-temperature, low-pressure, two-phase gas-liquid refrigerant. The refrigerant throttled in the pressure reducing device 105 and becomes a low-temperature, low-pressure, two-phase gas-liquid refrigerant flows into the indoor heat exchanger 106, where it evaporates and gasifies, and after flowing out of the indoor heat exchanger 106, it passes through the flow switching device 103 and returns to the compressor 100 again.

[0055] That is, when the refrigeration cycle apparatus 200 switches from heating operation to cooling operation, the indoor heat exchanger 106 switches from a condenser to an evaporator, and the outdoor heat exchanger 104 switches from an evaporator to a condenser. When the refrigeration cycle apparatus 200 is an air conditioner and the air conditioner is operating in cooling mode, the refrigerant circulates through the refrigerant circuit 201 as shown by the dashed arrows in Fig. 3. This circulation of the refrigerant causes heat exchange between the indoor air and the refrigerant in the indoor heat exchanger 106, which serves as an evaporator, and absorbs heat from the indoor air, i.e., cools the indoor air. The refrigerant that has absorbed heat is sent to the outdoor heat exchanger 104, which serves as a condenser, where it exchanges heat with the outdoor air and releases heat to the outdoor air.

[0056] The refrigerant flowing through the refrigerant circuit 201 may be, for example, R407C refrigerant, R410A refrigerant, or R32 refrigerant. Also usable as the refrigerant is, for example, a single refrigerant selected from R1234yf, R1234ze, R32, and R290, a mixture of two or more of these, a mixture of any of these with other refrigerants, a mixture containing R1132(E), or a mixture containing R1123. Also usable as the refrigerant is, for example, a mixture of R516A, R445A, R444A, R454C, R444B, R454A, R455A, R457A, R459B, R452B, R454B, R447B, R447A, R446A, or R459A.

[0057] [Detailed Configuration of Electric Motor 30] Figure 4 is a conceptual diagram showing a cross section of the electric motor 30 taken along line B-B in Figure 1 in the compressor 100 according to the embodiment, viewed in the direction of the arrows. Next, a detailed structure of the electric motor 30 that transmits rotational force to the compression mechanism 20 will be described. The electric motor 30 includes a substantially cylindrical stator 41 fixed to the inner circumferential wall of the sealed container 10, and a substantially columnar rotor 31 disposed inside the stator 41.

[0058] (Rotor 31) The rotor 31 is composed of a rotor core 32 formed by laminating core sheets punched from thin electromagnetic steel plates. The rotor 31 can be configured in two ways: one that uses permanent magnets like a brushless DC motor, and one that uses a secondary winding like an induction motor. For example, if the motor 30 is a brushless DC motor as shown in FIG. 4, the rotor core 32 has magnet insertion holes 33 extending in the axial direction, into which permanent magnets 34 such as ferrite magnets or rare earth magnets are inserted. In the motor 30, the permanent magnets 34 form magnetic poles on the rotor 31.

[0059] The electric motor 30 rotates the rotor 31 by the interaction of the magnetic flux generated by the magnetic poles on the rotor 31 and the magnetic flux generated by the stator winding of the stator 41. If the electric motor 30 is an induction motor (not shown), a secondary winding is provided in place of a permanent magnet on the rotor core 32. In this case, the stator winding of the stator 41 of the electric motor 30 induces magnetic flux in the secondary winding on the rotor 31 side to generate a rotational force, which rotates the rotor 31.

[0060] A shaft hole 32a through which the rotating shaft 21 passes is provided in the center of the rotor core 32, and a main shaft portion 21a of the rotating shaft 21 is fastened by shrink fitting or the like. The electric motor 30 transmits the rotational motion of the rotor 31 to the rotating shaft 21 by fixing the rotor 31 and the rotating shaft 21 together. The rotor 31 has air holes 35 formed around the shaft hole 32a. In the compressor 100, high-pressure, high-temperature refrigerant compressed by the compression mechanism 20 below the electric motor 30 passes through the air holes 35. Note that the refrigerant compressed by the compression mechanism 20 also passes through the air gap between the rotor 31 and the stator 41 or the gaps in the stator windings in addition to the air holes 35.

[0061] (Stator 41) Fig. 5 is a configuration diagram of the stator core 42 of the stator 41 used in the electric motor 30 of the compressor 100 according to the embodiment. Fig. 6 is a configuration diagram of the stator core 42 and insulating member 50 of the stator 41 used in the electric motor 30 of the compressor 100 according to the embodiment. Next, the stator 41 used in the electric motor 30 will be described in detail with reference to Figs. 4 to 6.

[0062] 4 to 6, the stator 41 has a plurality of stator cores 42, a plurality of insulating members 50, and a plurality of coils 47, and is used in the electric motor 30. More specifically, the stator 41 has the stator core 42 having annularly arranged core back portions 43 and teeth portions 44 protruding radially from the core back portions 43, and the coils 47 configured to form a plurality of layers with conductive wires 46 having a circular cross section wound around the teeth portions 44. The stator 41 also has insulators 51 that are arranged on both end faces of the stator core 42 in the axial direction of the stator 41 and that insulate the teeth portions 44 and core back portions 43 from the coils 47.

[0063] 6, the stator 41 is formed in a columnar shape and includes a pair of first faces F1 that form surfaces facing the teeth 44 of adjacent stators 41 with the insulating member 50 interposed therebetween, and a pair of second faces F2 that form surfaces perpendicular to the first faces F1. In other words, a plurality of teeth 44 are arranged in the circumferential direction of the stator 41. Each tooth 44 has a pair of first faces F1 that form surfaces facing adjacent teeth 44, and a pair of second faces F2 that form surfaces perpendicular to the pair of first faces and face the axial direction of the stator 41.

[0064] (Stator core 42) The stator core 42 forms the core of the stator 41. The stator core 42 is formed to extend in the axial direction of the rotating shaft 21. The stator core 42 is formed by laminating stator core sheets formed by punching thin electromagnetic steel plates.

[0065] The multiple stator cores 42 are arranged in an annular shape in the stator 41. The stator 41 is formed into a cylindrical shape with the multiple stator cores 42 arranged in the circumferential direction. The multiple stator cores 42 are formed such that adjacent stator cores 42 are connected to each other in the circumferential direction around the rotating shaft 21. The stator 41 of the compressor 100 according to the embodiment is formed by connecting multiple divided stator cores 42. Note that the stator 41 is not limited to this configuration, and for example, the stator 41 may be a cylindrical core integrally formed with the stator cores 42.

[0066] The stator core 42 is formed in a generally T-shape in plan view and includes a core back portion 43 arranged in an annular shape in the stator 41, teeth portions 44 protruding radially from the core back portion 43, and shoe portions 45 located at the ends of the teeth portions 44 opposite to the ends where the core back portions 43 are provided.

[0067] The core back portion 43 constitutes a portion of the stator 41 that extends in the circumferential direction of the stator 41 when viewed in the axial direction of the rotating shaft 21. The core back portion 43 constitutes the outer peripheral wall of the stator 41, and forms a cylindrical peripheral wall in the stator 41. Adjacent stator cores 42 are connected by joining their core back portions 43 together.

[0068] The teeth 44 are portions of the stator core 42 that protrude from the circumferential center of the core back portion 43 toward the center of the stator 41. The teeth 44 extend radially inward from the core back portion 43 of the stator 41. In a plan view of the stator 41, the circumferential width of the teeth 44 is smaller than the width of the core back portion 43 and is also smaller than the width of the shoe portion 45. Conductive wires 46 are wound around the teeth 44 via insulators 51 of the insulating member 50. Furthermore, the conductive wires 46 are wound around the teeth 44 via insulating films 55 of the insulating member 50.

[0069] The stator core 42 has shoe portions 45 that extend in the circumferential direction of the stator 41 in a plan view of the stator 41 at the end of the teeth 44 opposite to the end where the core back portions 43 are provided. The shoe portions 45 are portions of the stator core 42 that are located at the inner circumferential tips of the teeth 44. The shoe portions 45 are formed at the tips of the teeth 44 so as to extend in the circumferential direction of the stator 41 in a plan view. In a plan view of the stator 41, the circumferential width of the shoe portions 45 is greater than the width of the teeth 44. The stator core 42 is formed into an inverted T-shape in a plan view by the teeth 44 and the shoe portions 45.

[0070] 4, the stator 41 has slots 48 formed between adjacent teeth 44. The slots 48 are spaces formed by the core back portion 43, the teeth 44, and the side surfaces of the shoe portion 45. The stator 41 has coils 47 arranged in the slots 48, each coil being made up of a conducting wire 46 wound around the teeth 44.

[0071] (Insulating Member 50) The insulating member 50 is disposed between the stator core 42 and the conductor wires 46, and is used to insulate the conductor wires 46 from the stator core 42. The insulating member 50 includes an insulator 51 and an insulating film 55.

[0072] (Insulator 51) The insulator 51 insulates the teeth portion 44 and the core back portion 43 of the stator core 42 from the coil 47. The insulator 51 is disposed on the second surface F2 of the stator 41 and is an insulating member used to insulate the conductors 46 from the stator core 42. The insulator 51 is attached to both axial end surfaces of the stator core 42.

[0073] The stator core 42 is covered with insulators 51 at both axial ends of the rotating shaft 21. The stator 41 has a pair of insulators 51. The pair of insulators 51 cover both axial end faces of the stator core 42. In the stator 41, the conductor wires 46 are wound around the insulators 51.

[0074] The insulator 51, which insulates the stator core 42 from the conductors 46, includes a tooth insulating portion 53 facing the tooth portion 44 of the stator core 42, a core back insulating portion 52 facing the core back portion 43, and a shoe insulating portion 54 facing the shoe portion 45. If the insulating member 50 has a portion where the core back insulating portion 52 alone is not sufficient to insulate the core back portion 43 from the conductors 46, an insulating film 55 is used to supplement the insulation in that portion.

[0075] When the insulators 51 are placed over both axial ends of the stator core 42, the core-back insulating portions 52 face the axial end faces of the core-back portions 43 and cover the axial end faces of the core-back portions 43. The core-back insulating portions 52 are formed to extend in the circumferential and axial directions of the stator 41. The core-back insulating portions 52 are formed so that the height of their walls from the end faces of the stator core 42 in the axial direction of the rotating shaft 21 is greater than the height of the walls of the tooth insulating portions 53 from the end faces of the stator core 42.

[0076] When the insulator 51 is placed over both axial ends of the stator core 42, the tooth insulating portions 53 face the axial end faces of the tooth portions 44 and cover the axial end faces of the tooth portions 44. The tooth insulating portions 53 are formed to extend circumferentially and radially along the teeth portions 44 of the stator 41. The tooth insulating portions 53 are also formed to have a thickness in the axial direction of the rotating shaft 21. The tooth insulating portions 53 form walls in the insulator 51 that extend between the core-back insulating portion 52 and the shoe insulating portion 54.

[0077] When the insulators 51 are placed over both axial ends of the stator core 42, the shoe insulating parts 54 face the axial end faces of the shoe parts 45 and cover the axial end faces of the shoe parts 45. The shoe insulating parts 54 are formed to extend in both the circumferential and axial directions of the stator 41. The shoe insulating parts 54 extend circumferentially from the tooth insulating parts 53 in one direction in which the core back parts 43 extend, and also extend from the tooth insulating parts 53 in the other direction in which the core back parts 43 extend. The shoe insulating parts 54 are formed so that the height of their walls from the end faces of the stator core 42 in the axial direction of the rotating shaft 21 is greater than the height of the walls of the tooth insulating parts 53 from the end faces of the stator core 42.

[0078] Fig. 7 is a plan view of the stator 41 constituting the electric motor 30 of the compressor 100 according to the embodiment. Fig. 8 is a cross-sectional view of the stator 41 taken along line CC in Fig. 7, viewed in the direction of arrow A. Fig. 9 is a cross-sectional view of the stator 41 taken along line CC in Fig. 7, viewed in the direction of arrow B. Fig. 10 is a plan view of the stator 41 including the coil 47 constituting the electric motor 30 of the compressor 100 according to the embodiment. Note that the coil 47 is not shown in Figs. 7 to 9 to clarify the configuration of the insulator 51.

[0079] The two-dot chain lines in Figures 7 and 10 indicate the stator core 42. The numbers inside the conductors 46 in Figure 10 indicate the order in which the conductors 46 are arranged. The solid arrow AR1 and dotted arrow AR2 passing through the tooth insulating portion 53 in Figure 10 indicate the winding direction of the conductors 46. The solid arrow AR1 passing between the conductors 46 in Figure 10 indicates the winding direction of the conductors 46 on the second surface F2b (see Figure 11). The dotted arrow AR2 passing between the conductors 46 in Figure 10 indicates the winding direction of the conductors 46 on the second surface F2a (see Figure 11). Note that in Figure 10, the conductors 46 on the second surface F2 are not shown to clarify the structure of the insulator 51.

[0080] As shown in FIGS. 7 to 10, the insulator 51 has a core-back side guide portion 56 , a first oblique flange portion 57 , and a second oblique flange portion 58 .

[0081] 7 and 10 , the insulator 51 includes a core-back side guide portion 56 at the corner formed by the core-back insulating portion 52 and the tooth insulating portion 53 in a plan view of the stator 41. That is, the core-back side guide portion 56 is provided at the corner formed by the core-back portion 43 and the tooth portion 44 in a plan view of the stator 41. The core-back side guide portion 56 is a convex portion used to define the position of the conductor wire 46 in the coil 47 when the conductor wire 46 is wound around the tooth portion 44.

[0082] The stator 41 has insulators 51 provided on both ends of the stator core 42 in the axial direction of the rotating shaft 21. Therefore, the core-back side guide portions 56 are provided on both ends of the stator core 42 in the axial direction of the rotating shaft 21. The stator 41 is formed so that the core-back side guide portions 56 of the insulators 51 arranged on both ends of the stator core 42 face each other in the axial direction of the rotating shaft 21.

[0083] In the circumferential direction in a plan view of the stator 41, the core-back side guide portion 56 is disposed on one side surface of the tooth portion 44. For example, the core-back side guide portion 56 is formed on the first surface F1b and the second surface F2b of the tooth portion 44 in the insulator 51 disposed on the second surface F2b (see FIG. 11) side of the tooth portion 44. Furthermore, the core-back side guide portion 56 is formed on the first surface F1b and the second surface F2a of the tooth portion 44 in the insulator 51 disposed on the second surface F2a (see FIG. 11) side of the tooth portion 44.

[0084] The core-back side guide portion 56 is a protrusion provided on the core-back insulating portion 52 and the tooth insulating portion 53. The core-back side guide portion 56 protrudes from the inner peripheral side surface of the core-back insulating portion 52 toward the shoe insulating portion 54, and protrudes from the surface of the tooth insulating portion 53 opposite the stator core 42.

[0085] In the case of the insulator 51 arranged on the upper part of the stator core 42, the core-back side guide portion 56 is provided at the corner formed by the core-back insulating portion 52 and the tooth insulating portion 53, from a position on the upper surface side of the tooth portion 44 to a position on the side surface side. In the case of the insulator 51 arranged on the lower part of the stator core 42, the core-back side guide portion 56 is provided at the corner formed by the core-back insulating portion 52 and the tooth insulating portion 53, from a position on the lower surface side of the tooth portion 44 to a position on the side surface side.

[0086] The core-back side guide portion 56 is formed in a substantially rectangular shape in a plan view of the stator 41. The core-back side guide portion 56 is formed in a substantially L-shape or a substantially inverted L-shape in a side view seen in the radial direction of the stator 41.

[0087] 10 , the diameter of the conducting wire 46 that constitutes the coil 47 is defined as diameter D. In a plan view of the stator 41, the radial length of the core-back side guide portion 56 is defined as first length A, and the length of the core-back side guide portion 56 in a direction perpendicular to the radial direction and protruding from the tooth portion 44 is defined as second length B.

[0088] The core-back side guide portion 56 has a first length A that is greater than zero and shorter than the diameter D. The core-back side guide portion 56 also has a second length B that is greater than zero and shorter than "(√3 × diameter D) / 2". That is, the core-back side guide portion 56 is formed to satisfy the relationship "0 < A < D" and the relationship "0 < B < (√3 × D) / 2".

[0089] 7 and 10 , insulator 51 has first and second oblique flanges 57 and 58 at the corners formed by shoe insulating portions 54 and tooth insulating portions 53 in a plan view of stator 41. That is, first and second oblique flanges 57 and 58 are provided at the corners formed by shoe portions 45 and tooth portions 44 in a plan view of stator 41. First and second oblique flanges 57 and 58 are convex portions used to determine the position of conductor 46 in coil 47 when winding conductor 46 around tooth portions 44.

[0090] The first oblique flange 57 faces the corner formed by the shoe portion 45 and the tooth portion 44, and is formed to extend from the tooth insulating portion 53 in one direction along which the core back portion 43 extends in a plan view of the stator 41. The second oblique flange 58 faces the corner formed by the shoe portion 45 and the tooth portion 44, and is formed to extend from the tooth insulating portion 53 in the other direction along which the core back portion 43 extends in a plan view of the stator 41.

[0091] In the circumferential direction in a plan view of the stator 41, the first oblique flange 57 is disposed on one side surface of the tooth portion 44, and the second oblique flange 58 is disposed on the other side surface of the tooth portion 44. In the circumferential direction in a plan view of the stator 41, the first oblique flange 57 and the second oblique flange 58 are formed on opposite sides of the tooth portion 44. The first oblique flange 57 protrudes more toward the core-back insulating portion 52 in the radial direction of the stator 41 than the second oblique flange 58.

[0092] In the circumferential direction of the stator 41 in a plan view of the stator 41, the second oblique flange portion 58 is formed on the surface on the side where the core-back-side guide portion 56 is formed relative to the tooth portion 44. In other words, in the radial direction of the stator 41, the second oblique flange portion 58 and the core-back-side guide portion 56 are formed on both ends of the tooth portion 44 and are formed so as to face each other in the radial direction.

[0093] The first oblique flanges 57 are formed, for example, on the first surface F1a and second surface F2b of the teeth 44 in the insulator 51 arranged on the second surface F2b (see FIG. 11) side of the teeth 44. The first oblique flanges 57 are formed, for example, on the first surface F1a and second surface F2a of the teeth 44 in the insulator 51 arranged on the second surface F2a (see FIG. 11) side of the teeth 44.

[0094] The second inclined flanges 58 are formed, for example, on the first surface F1b and second surface F2b of the teeth 44 in the insulator 51 arranged on the second surface F2b (see FIG. 11) side of the teeth 44. The second inclined flanges 58 are formed, for example, on the first surface F1b and second surface F2a of the teeth 44 in the insulator 51 arranged on the second surface F2a (see FIG. 11) side of the teeth 44.

[0095] In the stator 41, insulators 51 are provided on both ends of the stator core 42 in the axial direction of the rotating shaft 21. Therefore, first oblique flanges 57 are provided on both ends of the stator core 42 in the axial direction of the rotating shaft 21. The stator 41 is formed so that the first oblique flanges 57 of the insulators 51 arranged on both ends of the stator core 42 face each other in the axial direction of the rotating shaft 21.

[0096] Further, the second oblique flanges 58 are provided on both ends of the stator core 42 in the axial direction of the rotating shaft 21. The stator 41 is formed such that the second oblique flanges 58 of the insulators 51 arranged on both ends of the stator core 42 face each other in the axial direction of the rotating shaft 21.

[0097] The first oblique flange 57 and the second oblique flange 58 are convex portions provided on the shoe insulating portion 54 and the tooth insulating portion 53. The first oblique flange 57 and the second oblique flange 58 protrude from the outer peripheral side surface of the shoe insulating portion 54 toward the core back insulating portion 52, and protrude from the surface of the tooth insulating portion 53 opposite the stator core 42.

[0098] In the case of insulator 51 arranged on the upper part of stator core 42, first oblique flange 57 and second oblique flange 58 are provided at the corner formed by shoe insulating portion 54 and tooth insulating portion 53, from a position on the upper surface side of tooth portion 44 to a position on the side surface side. In the case of insulator 51 arranged on the lower part of stator core 42, first oblique flange 57 and second oblique flange 58 are provided at the corner formed by shoe insulating portion 54 and tooth insulating portion 53, from a position on the lower surface side of tooth portion 44 to a position on the side surface side.

[0099] 7 and 10, the first oblique flange portion 57 and the second oblique flange portion 58 are formed in a generally triangular shape when viewed from above the stator 41. As shown in Fig. 9, the first oblique flange portion 57 and the second oblique flange portion 58 are formed in a generally L-shape or a generally inverted L-shape when viewed from a side in the radial direction of the stator 41.

[0100] The first oblique flange 57 and the second oblique flange 58 are formed to extend in the circumferential direction of the stator 41 in a plan view of the stator 41. The first oblique flange 57 has a first inclined surface 57a that is inclined away from the tooth insulating portion 53 from the outer circumferential side toward the inner circumferential side in the radial direction of the stator 41 in a plan view of the stator 41. The second oblique flange 58 has a second inclined surface 58a that is inclined away from the tooth insulating portion 53 from the outer circumferential side toward the inner circumferential side in the radial direction of the stator 41 in a plan view of the stator 41. In other words, the insulator 51 has the first inclined surface 57a and the second inclined surface 58a that are inclined toward the core-back insulating portion 52 from the outer circumferential side toward the center in the circumferential direction of the stator 41.

[0101] 7 and 10 , the first oblique flange 57 has a first inclined surface 57a that is an inclined surface that is inclined with respect to the radial direction of the stator 41 or the extension direction of the teeth 44 in a plan view of the stator 41. Furthermore, the second oblique flange 58 has a second inclined surface 58a that is an inclined surface that is inclined with respect to the radial direction of the stator 41 or the extension direction of the teeth 44 in a plan view of the stator 41.

[0102] In a plan view of the stator 41, the first inclined surfaces 57a are inclined so as to move away from the tooth insulating portions 53 as they move from the outer circumferential side to the inner circumferential side in the radial direction of the stator 41. The first inclined surfaces 57a are inclined so as to move away from the tooth insulating portions 53 as they move from the core back insulating portion 52 side to the shoe insulating portion 54 side in the radial direction of the stator 41. In a plan view of the stator 41, the first inclined surfaces 57a form surfaces that face in directions away from the tooth insulating portions 53 and in directions away from the shoe insulating portions 54.

[0103] In a plan view of the stator 41, the second inclined surfaces 58a are inclined so as to move away from the tooth insulating portions 53 as they move from the outer circumferential side to the inner circumferential side in the radial direction of the stator 41. In a plan view of the stator 41, the second inclined surfaces 58a are inclined so as to move away from the tooth insulating portions 53 as they move from the core back insulating portion 52 side to the shoe insulating portion 54 side. In a plan view of the stator 41, the second inclined surfaces 58a form surfaces that face in directions away from the tooth insulating portions 53 and in directions away from the shoe insulating portion 54. In a direction perpendicular to the radial direction of the stator 41, the second inclined surfaces 58a form surfaces that face the opposite direction from the first inclined surfaces 57a.

[0104] 7, the first inclined surface 57a of the first inclined flange 57 is formed so that the angle α of the outer periphery with respect to the radial direction is 120 degrees in a plan view of the stator 41. Similarly, the second inclined surface 58a of the second inclined flange 58 is formed so that the angle β of the outer periphery with respect to the radial direction is 120 degrees in a plan view of the stator 41.

[0105] 10 , a virtual second oblique flange 58b indicates the position of the virtual second oblique flange 58 when the second oblique flange 58 is formed. As shown in Fig. 10 , the insulator 51 is configured such that the first oblique flange 57 is spaced further from the shoe portion 45 than the second oblique flange 58 by the first length A of the core-back-side guide portion 56 in the radial direction of the stator 41. That is, as shown in Fig. 10 , the insulator 51 is configured such that the first oblique flange 57 protrudes toward the core-back insulating portion 52 beyond the second oblique flange 58 by the first length A of the core-back-side guide portion 56 in the radial direction of the stator 41.

[0106] In this way, by forming the core-back side guide portion 56, the first oblique flange portion 57, and the second oblique flange portion 58 on the insulator 51, the stator 41 can arrange the conductor 46 at both radial ends of the second surface F2 of the stator 41 so that the conductor 46 is perpendicular to the radial direction. As shown in FIG. 10, on the second surface F2b (see FIG. 11) of the stator 41, the conductor 46 is wound from the first surface F1a (see FIG. 11) side, which is on the right side of the teeth 44, to the first surface F1b (see FIG. 11) side, which is on the left side of the teeth 44. The winding method of the conductor 46 will be described later.

[0107] 10 , the stator 41 is configured such that, for example, the conductors 46 are orthogonal to the radial direction between the 11th conductor 46 on the right side and the 11th conductor 46 on the left side via the teeth 44. Similarly, the stator 41 is configured such that the conductors 46 are orthogonal to the radial direction between the 31st conductors 46 on the left and right sides via the teeth 44.

[0108] The coil 47 is arranged so that the conductor 46 between the conductor 46 abutting the first inclined flange portion 57 and the conductor 46 abutting the second inclined flange portion 58 is perpendicular to the radial direction of the stator 41 on each of a pair of second surfaces F2.

[0109] The stator 41 is configured such that the conductors 46 are perpendicular to the radial direction between the 21st conductor 46 on the right side and the 21st conductor 46 on the left side, with the teeth 44 interposed therebetween. Similarly, the stator 41 is configured such that the conductors 46 are perpendicular to the radial direction between the 42nd conductors 46 and the 57th conductors 46 located on the left and right sides, with the teeth 44 interposed therebetween.

[0110] In the coil 47, the conductors 46 between the conductors 46 abutting against the core-back insulating portion 52 on one of the pair of first surfaces F1 and the conductors 46 abutting against the core-back insulating portion 52 on the other of the pair of first surfaces F1 are arranged as follows: In the stator 41, the conductors 46 between the conductors 46 abutting against the core-back insulating portion 52 on the first surface F1a and the conductors 46 abutting against the core-back insulating portion 52 on the first surface F1b are arranged on each of the pair of second surfaces F2 so as to be perpendicular to the radial direction of the stator 41.

[0111] The stator 41 can arrange the conductors 46 at both radial ends of the second surface F2 of the stator 41 so that they are perpendicular to the radial direction, and therefore the conductors 46 can be closely attached to the insulator 51. Therefore, the stator 41 can prevent the conductors 46 from shifting relative to the insulator 51 due to vibration.

[0112] (Insulating Film 55) As shown in FIG. 6 , the insulating film 55 is an insulating member 50 that is disposed on the first surface F1 of the stator 41 and is used to insulate the conductor wires 46 from the stator core 42. The insulating film 55 is attached to the surfaces of the multiple stator cores 42 that form slots 48 (see FIG. 4 ), which are spaces between adjacent stator cores 42, and insulates the multiple stator cores 42 from the conductor wires 46 wound around each of the multiple stator cores 42. The insulating film 55 is disposed in the slots 48 so as to face the side surfaces of the core back portion 43, the teeth portion 44, and the shoe portion 45. The insulating film 55 insulates the conductor wires 46 from the stator core 42 and also provides insulation between adjacent multiple stator cores 42.

[0113] The insulating film 55 is a film-like insulating member 50. The material of the insulating film 55 is, for example, polyethylene terephthalate (PET) film, but is not limited to PET film. The thickness of the insulating film 55 is, for example, 0.1 mm to 0.2 mm, but is not limited to this thickness.

[0114] (Coil 47) The coil 47 is configured by winding a conductor 46 around the teeth 44 to form multiple layers. As shown in FIG. 4 , a portion of the coil 47 is disposed in a slot 48. The conductor 46 is an electric wire with a circular cross section. The circular cross section includes various circular cross sections, such as a perfect circle and an ellipse. In the stator 41, a rotating magnetic field is generated when a current flows through the conductor 46. The conductor 46 is wound around the teeth 44 of the stator core 42 via an insulator 51 and an insulating film 55. Next, a method for making the coil 47 will be described.

[0115] FIG. 11 is a configuration diagram of a stator 41 according to an embodiment. Diagram (A) of FIG. 11 is a conceptual diagram showing the stator core 42 and the conductor wires 46 as viewed from the shoe portion 45 side in the radial direction of the stator 41. Diagram (B) of FIG. 11 is a conceptual diagram showing a cross section of the coil 47 as viewed from the second surface F2b. Diagram (C) of FIG. 11 is a conceptual diagram showing a cross section of the coil 47 as viewed from the second surface F2a. Diagram (D) of FIG. 11 is a conceptual diagram showing a cross section of the coil 47 as viewed from the first surface F1a. Diagram (E) of FIG. 11 is a conceptual diagram showing a cross section of the coil 47 as viewed from the first surface F1b. The first surface F1a, the first surface F1b, the second surface F2a, and the second surface F2b are defined as follows.

[0116] 11, of the pair of first surfaces F1, one surface in the circumferential direction is referred to as the first surface F1a, and the other surface is referred to as the first surface F1b. For example, in a case where the compressor 100 is disposed so that the rotating shaft 21 is aligned in the up-down direction, when the stator 41 is viewed from above, the surface of the stator 41 facing in the clockwise direction is referred to as the first surface F1a, and the surface of the stator 41 facing in the counterclockwise direction is referred to as the first surface F1b.

[0117] Of the pair of second surfaces F2, one surface in the axial direction of the rotating shaft 21 is referred to as the second surface F2a, and the other surface is referred to as the second surface F2b. For example, in a case where the compressor 100 is disposed so that the rotating shaft 21 is aligned in the up-down direction, when the stator 41 is viewed from the side, the surface of the stator 41 facing downward is referred to as the second surface F2a, and the surface of the stator 41 facing upward is referred to as the second surface F2b.

[0118] 10 and 11 , a winding method for winding the conductor 46 around the teeth 44 of the stator 41 of the electric motor 30 will be described. The conductor 46 is wound around the teeth 44. For example, as shown in FIGS. 10 and 11 , the conductor 46 is wound around the first surface F1 a, the second surface F2 b, the first surface F1 b, and the second surface F2 a of the teeth 44 in this order. Then, to create the coil 47, this process is repeated, and the conductor 46 is wound around the teeth 44.

[0119] 10, the conductor wire 46 is wound around the second surface F2b of the stator 41 from the first surface F1a, which is on the right side of the teeth 44, to the first surface F1b, which is on the left side of the teeth 44. On the second surface F2a of the stator 41, the conductor wire 46 is wound around the first surface F1b, which is on the left side of the teeth 44, to the first surface F1a, which is on the right side of the teeth 44, as shown by the dotted arrow AR2 in FIG.

[0120] As described above, the numbers in the conductors 46 in Fig. 10 indicate the order in which the conductors 46 are arranged. The conductors 46 are arranged on the first surfaces F1a and F1b of the teeth 44 so that as the conductors 46 are wound, they move from the outer circumferential side toward the inner circumferential side in the radial direction. That is, on the first surfaces F1a and F1b of the teeth 44, the conductors 46 are arranged so that as the conductors 46 are wound, they move radially from the core-back insulating portion 52 toward the shoe insulating portion 54, as shown in Fig. 10.

[0121] 10, when the conductor 46 comes into contact with the shoe insulating part 54 on the first surfaces F1a and F1b of the tooth part 44, the conductor 46 is arranged so as to move from the inner periphery toward the outer periphery in the radial direction as the conductor 46 is wound. That is, on the first surfaces F1a and F1b of the tooth part 44, the conductor 46 is arranged so as to move from the shoe insulating part 54 toward the core-back insulating part 52 in the radial direction as the conductor 46 is wound, as shown in FIG.

[0122] The conductor 46 is wound around the teeth 44 to form a first layer, and then the conductor 46 is wound on top of the first layer to form a second layer. This process is repeated for the stator 41, and the coil 47 is formed from multiple layers of the conductor 46.

[0123] 11(D) shows a cross section of the coil 47 taken along line dd on the first surface F1a of the stator 41. On the first surface F1a of the stator 41, the distance between the center points of adjacent conductors 46 in the radial direction of the conductors 46 or in a direction perpendicular to the radial direction is expressed as a distance √3D / 2, where D is the diameter of the conductors 46.

[0124] 11(E) shows a cross section of the coil 47 taken along line c-c on the first surface F1b of the stator 41. On the first surface F1b of the stator 41, the distance between the center points of adjacent conductors 46 in the radial direction of the conductors 46 or in a direction perpendicular to the radial direction is expressed as a distance √3D / 2, where D is the diameter of the conductors 46.

[0125] 11 (D) and (E), when winding the conductor 46 on the first surface F1 of the stator 41, the conductor 46 is wound in an aligned manner. Aligned winding is a method of winding the conductor 46 evenly rather than arranging it randomly. For example, aligned winding refers to a method in which the conductor 46 in each layer stacked on the first surface F1 of the stator 41 is stacked and wound with a pitch offset of ½ the diameter of the conductor 46. Also, aligned winding is a winding method in which the conductor 46 is sequentially wound from one end of the tooth portion 44 to the other in the radial direction and then sequentially wound back from the other end to one end, stacking the conductor 46 in a bale-like manner.

[0126] 11D and 11E, the coil 47 of the stator 41 has an aligned winding portion LR in the portions of both the first faces F1a and F1b of the stator 41. In the aligned winding portion LR, the conductors 46 arranged on both first faces F1 are configured as aligned windings, and the conductors 46 are stacked between adjacent layers of the conductors 46.

[0127] 11B shows a cross section of the coil 47 taken along line aa on the second surface F2b of the stator 41. On the second surface F2b of the stator 41, the distance between the center points of adjacent conductors 46 in the radial direction of the conductors 46 or in a direction perpendicular to the radial direction is expressed as distance D, where D is the diameter of the conductors 46.

[0128] 11C shows a cross section of the coil 47 taken along line bb on the second surface F2a of the stator 41. On the second surface F2a of the stator 41, the distance between the center points of adjacent wires 46 in the radial direction of the wires 46 or in a direction perpendicular to the radial direction is expressed as distance D, where D is the diameter of the wires 46.

[0129] 11B and 11C, the conductor 46 has a portion that is wound obliquely on the second surface F2 of the stator 41. Oblique winding is a winding method in which the conductor 46 is wound obliquely with respect to the radial direction of the stator 41 when viewed from above, and adjacent conductors in the stacking direction cross each other.

[0130] 11B and 11C, the coil 47 of the stator 41 has an intersection CR in the portions of both the second surfaces F2a and F2b of the stator 41. At the intersection CR, the conductor wires 46 arranged on both second surfaces F2 are configured to be obliquely wound, and are arranged so that adjacent layers of the conductor wires 46 cross each other.

[0131] In the winding method for the conductor 46, when the conductor 46 is wound around one of the pair of first surfaces F1 (first surface F1a), a first step is performed in which the conductor 46 is wound around the teeth 44 by aligned winding. Next, in the winding method for the conductor 46, when the conductor 46 is wound around one of the pair of second surfaces F2 (second surface F2b), a second step is performed in which the conductor 46 is wound around the teeth 44 by oblique winding, in which the conductor 46 is wound around the teeth 44 obliquely with respect to the radial direction of the stator 41.

[0132] Next, in the winding method for the conductor 46, when winding the conductor 46 on the other surface (first surface F1b) of the pair of first surfaces F1, a third step is performed in which the conductor 46 is wound around the teeth 44 by aligned winding. Next, in the winding method for the conductor 46, when winding the conductor 46 on the other surface (second surface F2a) of the pair of second surfaces F2, a fourth step is performed in which the conductor 46 is wound around the teeth 44 by oblique winding, in which the conductor 46 is wound around the teeth 44 obliquely with respect to the radial direction of the stator 41. The coil 47 is produced by sequentially repeating the first step, second step, third step, and fourth step.

[0133] The coil 47 has an aligned winding portion LR and a crossing portion CR. The aligned winding portion LR is a portion where the conductor 46 is wound in an aligned manner and adjacent layers are stacked in a row in a portion arranged to face each of the pair of first surfaces F1. That is, the coil 47 of the stator 41 has the aligned winding portion LR formed on the first surface F1a and the first surface F1b, where the conductor 46 is wound in an aligned manner and adjacent layers are stacked in a row.

[0134] The first and third steps include forming an aligned winding portion LR in the coil 47 in the portion facing each of the pair of first surfaces F1, in which the conductor wire 46 is wound in an aligned manner and stacked in adjacent layers.

[0135] The crossing portions CR are portions of the conductor wire 46 that are wound obliquely around the teeth 44 at an angle relative to the radial direction of the stator 41 in portions that are arranged to face each of the pair of second surfaces F2, and are arranged so that adjacent layers of the conductor wire 46 cross each other. That is, the coil 47 of the stator 41 has crossing portions CR formed on the second surfaces F2b and F2b, where the conductor wire 46 is wound obliquely and is arranged so that adjacent layers of the conductor wire 46 cross each other.

[0136] The second and fourth steps include forming an intersection CR in the coil 47 in the portion facing each of the pair of second surfaces F2, where the conductor 46 is wound diagonally around the tooth portion 44 at an angle relative to the radial direction and where adjacent layers of the conductor 46 intersect.

[0137] The forward winding of the first layer of conductor 46 begins with the conductor 46 abutting against the core-back insulating portion 52 and the tooth insulating portion 53. After the wound conductor 46 abuts against the first oblique flange portion 57 and the tooth insulating portion 53, the conductor 46 is wound perpendicular to the radial direction on the second surface F2. Then, the return winding, which is the second winding layer, begins while the conductor 46 abuts against the second oblique flange portion 58. In the return winding of the second layer of conductor 46, after the conductor 46 abuts against the core-back insulating portion 52, the conductor 46 is wound perpendicular to the radial direction on the second surface F2. Then, while the conductor 46 abuts against the core-back insulating portion 52, the forward winding of the third layer of conductor 46 begins.

[0138] More specifically, in the winding method for the conductor 46, in the first winding of the conductor 46, the winding of the conductor 46 begins while the conductor 46 is in contact with the core-back insulating portion 52 and the tooth insulating portion 53. The conductor 46 is brought into contact with the surface of the core-back side guide portion 56 on the shoe insulating portion 54 side, and is then wound around the teeth 44 of the stator 41 in the radial direction of the stator 41.

[0139] In the winding method of the conductor 46, after the conductor 46 wound around the tooth portion 44 abuts against the first oblique flange portion 57 and the tooth insulating portion 53, the conductor 46 is wound on the second surface F2 so as to be perpendicular to the radial direction of the stator 41. In the winding method of the conductor 46, after the orthogonally wound conductor 46 abuts against the second oblique flange portion 58, the return winding, which is the second winding of the conductor 46, begins.

[0140] In the winding method for the conductor 46, in the return winding, which is the second winding layer of the conductor 46, after the conductor 46 abuts against the core-back insulating portion 52, the conductor 46 is wound orthogonally to the radial direction on the second surface F2. In the winding method for the conductor 46, the orthogonally wound conductor 46 is brought into contact with the core-back insulating portion 52, and then the forward winding, which is the third winding layer of the conductor 46, is started.

[0141] [Effects of the Stator 41] The coil 47 of the stator 41 has intersections CR in the portions of the coil 47 that face each of the pair of second surfaces F2 of the teeth 44. The intersections CR are portions of the conductor wire 46 that are wound obliquely around the teeth 44 at an angle relative to the radial direction and that are arranged so that adjacent layers of the conductor wire 46 cross each other in the portions that face each of the pair of second surfaces F2. The stator 41 has intersections CR on both of the pair of second surfaces F2, rather than on only one of the pair of second surfaces F2. Therefore, compared to when the intersections CR are formed on only one of the pair of second surfaces F2, the stator 41 can balance the lengths and arrangements of the conductor wires 46 in the portions of the pair of second surfaces F2, suppressing magnetic imbalance and enabling the generation of a favorable magnetic field.

[0142] In contrast, the stator of Patent Document 1 has conductor wires arranged in an aligned winding on one of the pair of first surfaces F1 and the pair of second surfaces F2 so that the conductor wires can be packed densely, and on the remaining of the second surfaces F2, the conductor wires are arranged in an oblique winding to allow the conductor wires to be wound. In the stator of Patent Document 1, the conductor wires arranged in multiple layers on the pair of first surfaces and one of the pair of second surfaces F2 are arranged in a bale-like stacking manner, and on the remaining second surface, the conductor wires are arranged so that the conductor wires cross each other in adjacent layers above and below. When the conductor wires are arranged in a bale-like stacking manner, the stack height is reduced, while when the conductor wires are arranged so that they cross each other, the stack height becomes higher. Therefore, the stator of Patent Document 1 has a problem in that the conductor wires on one second surface, which are aligned and obliquely wound, have an imbalance in conductor wire length and conductor wire arrangement, making it difficult to generate a suitable magnetic field.

[0143] In contrast, the stator 41 of the embodiment does not have the crossing portion CR formed on only one of the pair of second surfaces F2, but has the crossing portion CR formed on both of the pair of second surfaces F2, thereby making it possible to balance the length of the conductors 46 and the arrangement of the conductors 46. Therefore, the stator 41 of the embodiment suppresses magnetic imbalance and can form a suitable magnetic field. Furthermore, the stator 41 of the embodiment suppresses magnetic imbalance and can form a suitable magnetic field, making it possible to suppress noise and vibration of the stator 41 caused by magnetic imbalance.

[0144] Furthermore, in the stator 41 of the embodiment, the conductor 46 is configured to be wound obliquely on the pair of second surfaces F2. Therefore, in the stator 41, the feed amount of the conductor 46 can be reduced and the conductor 46 can be wound at a higher speed than in a configuration in which the conductor 46 is formed to be wound obliquely on only one of the pair of second surfaces F2.

[0145] In addition, the coil 47 of the stator 41 has an aligned winding section LR in which the conductor 46 is wound in an aligned manner and stacked in adjacent layers in a manner that faces each of the pair of first surfaces F1.

[0146] Because the conductor wires 46 are wound in an aligned manner on the first surface F1 of the stator 41, there is no unnecessary gap between the conductor wires 46, compared to when the first surface F1 is not wound in an aligned manner. Therefore, compared to when the first surface F1 of the stator 41 is not wound in an aligned manner, the stator 41 can arrange thicker conductor wires 46 with the same number of turns between adjacent teeth 44, or can arrange a larger number of conductor wires 46 of the same thickness. As a result, the stator 41 can suppress copper loss, compared to when the first surface F1 is not wound in an aligned manner.

[0147] The insulator 51 also has a convex core-back side guide portion 56 at the corner formed by the core-back insulating portion 52 and the tooth insulating portion 53, which is used to define the position of the conductor 46. The insulator 51 also has a convex first oblique flange portion 57 and a convex second oblique flange portion 58 at the corner formed by the shoe insulating portion 54 and the tooth insulating portion 53, which are used to define the position of the conductor 46. In the circumferential direction of the stator 41, the first oblique flange portion 57 and the second oblique flange portion 58 are formed on opposite sides of the tooth portion 44. The first oblique flange portion 57 protrudes radially toward the core-back insulating portion 52 beyond the second oblique flange portion 58.

[0148] The stator 41 has a core-back-side guide portion 56, a first inclined flange portion 57, and a second inclined flange portion 58 on the insulator 51, so that the conductor 46 at both radial ends of the pair of second surfaces F2 is arranged perpendicular to the radial direction of the stator 41. Therefore, the stator 41 can bring the conductor 46 into close contact with the insulator 51. Because the stator 41 can bring the conductor 46 into close contact with the insulator 51, it is possible to prevent the conductor 46 from shifting relative to the insulator 51 due to vibration. Furthermore, because the stator 41 can bring the conductor 46 into close contact with the insulator 51, it is possible to reduce the feed amount of the winding of the conductor 46 when folding back in the radial direction of the stator 41. The stator 41 can reduce the amount of feed required to wind the conductor 46 when folding it back, allowing the conductor 46 to be wound at high speed, resulting in higher quality and productivity compared to a stator that does not have a core back side guide portion 56 or the like on the insulator 51.

[0149] Furthermore, in a plan view of the stator 41, the first inclined flange 57 has a first inclined surface 57a that is inclined so as to move away from the tooth insulating portion 53 from the outer circumferential side toward the inner circumferential side in the radial direction of the stator 41. Furthermore, the second inclined flange 58 has a second inclined surface 58a that is inclined so as to move away from the tooth insulating portion 53 from the outer circumferential side toward the inner circumferential side in the radial direction of the stator 41 in the plan view of the stator 41.

[0150] The stator 41 has the first inclined surface 57a and the second inclined surface 58a on the insulator 51, so that the conductor 46 at both radial ends of the pair of second surfaces F2 can be positioned so as to be more reliably perpendicular to the radial direction of the stator 41. Therefore, the stator 41 can bring the conductor 46 into close contact with the insulator 51. Because the stator 41 can bring the conductor 46 into close contact with the insulator 51, it is possible to prevent the conductor 46 from shifting relative to the insulator 51 due to vibration. Furthermore, because the stator 41 can bring the conductor 46 into close contact with the insulator 51, it is possible to reduce the feed amount of the winding of the conductor 46 when turning back in the radial direction of the stator 41. Because the feed amount of the winding of the conductor 46 can be reduced in the stator 41, it is possible to wind the conductor 46 at high speed, resulting in higher quality and productivity compared to a stator in which the insulator 51 does not have the first inclined surface 57a and the second inclined surface 58a.

[0151] The core-back side guide portion 56 is formed so that the first length A satisfies the relationship 0<A<D and the second length B satisfies the relationship 0<B<(√3×D) / 2. The first inclined surface 57a of the first inclined flange portion 57 is formed so that the angle α of the outer circumferential surface with respect to the radial direction is 120 degrees in a plan view of the stator 41. The second inclined surface 58a of the second inclined flange portion 58 is formed so that the angle β of the outer circumferential surface with respect to the radial direction is 120 degrees in a plan view of the stator 41. The insulator 51 is configured so that the first inclined flange portion 57 protrudes further toward the core-back insulating portion 52 than the second inclined flange portion 58 by the first length A of the core-back side guide portion 56.

[0152] Since the stator 41 is formed to have the above configuration, the winding of the conductor 46 at the ends of the teeth 44 on the shoe portion 45 side in the radial direction on the pair of second surfaces F2 causes the conductor 46 to be wound orthogonal to the radial direction. In other words, since the stator 41 is formed to have the above configuration, the winding of the conductor 46 at the turning back points in the radial direction on the pair of second surfaces F2 causes the conductor 46 to be wound orthogonal to the radial direction. Compared to a stator not having the above configuration, the stator 41 allows the winding feed amount of the conductor 46 at the turning back points on the teeth 44 to be smaller, and therefore the conductor 46 can be wound at high speed.

[0153] The coil 47 is arranged such that the conductor 46 between the conductor 46 abutting the core-back insulating portion 52 on one first surface F1 and the conductor 46 abutting the core-back insulating portion 52 on the other first surface F1 intersects perpendicularly to the radial direction on each of the pair of second surfaces F2. The coil 47 is arranged such that the conductor 46 between the conductor 46 abutting the first oblique flange portion 57 and the conductor 46 abutting the second oblique flange portion 58 intersects perpendicularly to the radial direction on each of the pair of second surfaces F2.

[0154] The stator 41 has the above-described configuration, which allows the conductor 46 to be tightly attached to the insulator 51. Because the stator 41 can tightly attach the conductor 46 to the insulator 51, it is possible to prevent the conductor 46 from shifting relative to the insulator 51 due to vibration. Furthermore, because the stator 41 can tightly attach the conductor 46 to the insulator 51, it is possible to reduce the feed amount of the conductor 46 when winding it back and forth in the radial direction of the stator 41. Because the feed amount of the conductor 46 when winding it back and forth can be reduced, the stator 41 allows the conductor 46 to be wound at high speed, resulting in higher quality and productivity compared to a stator in which the insulator 51 does not have a core-back-side guide portion 56 or the like.

[0155] The electric motor 30 having the stator 41 according to the embodiment, the compressor 100 having the electric motor 30, and the refrigeration cycle device 200 having the compressor 100 are equipped with the stator 41 according to the embodiment. Therefore, the electric motor 30, the compressor 100, and the refrigeration cycle device 200 can obtain the same effects as those of the stator 41 according to the embodiment.

[0156] The winding method for the stator 41 also includes the following steps. The winding method for the stator 41 includes a first step in which, when winding the conductor 46 on one of the pair of first faces F1, the conductor 46 is wound around the teeth 44 by aligned winding. The winding method for the stator 41 also includes a second step in which, when winding the conductor 46 on one of the pair of second faces F2, the conductor 46 is wound around the teeth 44 by oblique winding, in which the conductor 46 is wound around the teeth 44 at an angle relative to the radial direction of the stator 41. The winding method for the stator 41 also includes a third step in which, when winding the conductor 46 on the other of the pair of first faces F1, the conductor 46 is wound around the teeth 44 by aligned winding. The winding method for the stator 41 also includes a fourth step in which, when winding the conductor 46 around the other of the pair of second surfaces F2, the conductor 46 is wound around the teeth 44 by oblique winding, in which the conductor 46 is wound around the teeth 44 obliquely with respect to the radial direction of the stator 41. The winding method for the stator 41 forms the coils 47 by repeating the first, second, third, and fourth steps. The winding method for the stator 41 also includes, in the first and third steps, a step of forming an aligned winding portion LR in which the conductor 46 is wound in an aligned manner and stacked in adjacent layers in the coils 47 facing each of the pair of first surfaces F1. The winding method for the stator 41 also includes, in the second and fourth steps, a step of forming an intersection portion CR in which the conductor 46 is wound in an oblique manner and intersects with adjacent layers in the coils 47 facing each of the pair of second surfaces F2.

[0157] In the winding method for the stator 41 according to the embodiment, the conductor 46 is wound obliquely on two second surfaces F2, and therefore, compared to a configuration in which the conductor 46 is wound obliquely on one second surface F2, the feed amount for winding the conductor 46 can be reduced, and the conductor 46 can be wound at a higher speed. In the winding method for the stator 41, the feed amount for winding the conductor 46 at the turnbacks can be reduced, and therefore the conductor 46 can be wound at a higher speed, and a stator 41 with higher quality and productivity can be provided compared to a winding method that does not include this method.

[0158] The winding method for the stator 41 includes the following steps. In the first winding of the conductor 46, the forward winding begins with the conductor 46 in contact with the core-back insulating portion 52 and the tooth insulating portion 53. The winding method for the stator 41 then brings the conductor 46 into contact with the surface of the core-back side guide portion 56 facing the shoe insulating portion 54, and then winds the conductor 46 radially around the teeth 44. After the wound conductor 46 contacts the first oblique flange portion 57 and the tooth insulating portion 53, the conductor 46 is wound orthogonally to the radial direction on the second surface F2. After the orthogonally wound conductor 46 contacts the second oblique flange portion 58, the return winding begins.

[0159] In the winding method of the stator 41, the conductor 46 is wound as described above, so that when the conductor 46 is wound at the end of the tooth portion 44 on the shoe portion 45 side in the radial direction on the second surface F2, the conductor 46 is wound orthogonal to the radial direction. That is, when the conductor 46 is wound at the turning point of the winding in the radial direction on the second surface F2, the conductor 46 is wound orthogonal to the radial direction. In the winding method of the stator 41, by winding the conductor 46 orthogonal to the radial direction when turning back the winding of the conductor 46, the winding feed amount when turning back the conductor 46 around the tooth portion 44 can be reduced compared to a winding method that does not include this method. Therefore, the winding method of the stator 41 allows the conductor 46 to be wound at high speed.

[0160] The winding method for the stator 41 includes the following steps. In the return winding, which is the second layer of winding of the conductor 46, after the conductor 46 abuts against the core-back insulating portion 52, the conductor 46 is wound orthogonally to the radial direction on the second surface F2. Then, in the winding method for the stator 41, the orthogonally wound conductor 46 is brought into contact with the core-back insulating portion 52, and the forward winding, which is the third layer of winding of the conductor 46, is started. Because the conductor 46 is wound around the stator 41 as described above, the conductor 46 is wound orthogonally to the radial direction when the conductor 46 is wound at the turning point of the radial winding on the second surface F2. In the winding method of the stator 41, the conductor 46 is wound so as to be perpendicular to the radial direction when the conductor 46 is wound back, and this reduces the amount of winding feed when the conductor 46 is wound back around the teeth 44 compared to a winding method that does not include this method. Therefore, the winding method of the stator 41 allows the conductor 46 to be wound at high speed.

[0161] The configurations shown in the above embodiments are merely examples, and may be combined with other known technologies, and parts of the configurations may be omitted or modified without departing from the spirit of the invention.

[0162] REFERENCE SIGNS LIST 10 Sealed container, 11 Upper container, 12 Lower container, 20 Compression mechanism, 21 Rotating shaft, 21a Main shaft portion, 21b Eccentric shaft portion, 21c Sub-shaft portion, 22 Rolling piston, 22a Outer circumferential wall, 23 Cylinder, 23a Cylinder chamber, 23a1 Inner circumferential wall, 23b Back pressure chamber, 23c Vane groove, 23e Intake port, 24 Upper bearing, 25 Lower bearing, 26 Vane, 27 Discharge muffler, 30 Electric motor, 31 Rotor, 32 Rotor core, 32a Shaft hole, 33 Magnet insertion hole, 34 Permanent magnet, 35 Air hole, 37 Lead wire, 38 Glass terminal, 41 Stator, 42 Stator core, 43 Core back portion, 44 Teeth portion, 45 Shoe portion, 46 Conductor, 47 Coil, 48 Slot, 50 insulating member, 51 insulator, 52 core back insulating portion, 53 tooth insulating portion, 54 shoe insulating portion, 55 insulating film, 56 core back side guide portion, 57 first inclined flange portion, 57a first inclined surface, 58 second inclined flange portion, 58a second inclined surface, 58b virtual second inclined flange portion, 100 compressor, 101 suction muffler, 102 discharge pipe, 103 flow path switching device, 104 outdoor heat exchanger, 105 pressure reducing device, 106 indoor heat exchanger, 113 suction connecting pipe, 200 refrigeration cycle device, 201 refrigerant circuit, A arrow, AR1 solid arrow, AR2 dotted arrow, B arrow, CR intersection portion, D distance, F1 first surface, F1a first surface, F1b first surface, F2 Second surface, F2a Second surface, F2b Second surface, LR aligned winding section, α angle, β angle.

Claims

1. A stator used in an electric motor, comprising: A stator core having an annular core back portion and tooth portions protruding radially from the core back portion; A coil configured such that a round cross-section conductor is wound around the tooth portions to form a plurality of layers; Insulators disposed on both end faces of the stator core in the axial direction of the stator to insulate the tooth portions, the core back portion, and the coil; Comprising: The tooth portions are A plurality of the tooth portions are arranged in the circumferential direction of the stator, and a pair of first surfaces that are surfaces where adjacent tooth portions face each other, and a pair of second surfaces that are surfaces orthogonal to the pair of first surfaces; Having: The coil is In a portion disposed to face each of the pair of first surfaces, an aligned winding portion where the conductors are wound in alignment and are stacked in a staggered manner between adjacent layers; In a portion disposed to face each of the pair of second surfaces, an inclined winding portion where the conductors are wound around the tooth portions obliquely with respect to the radial direction, and a crossing portion where the conductors cross between adjacent layers of the conductors; Having: The stator core is At an end portion of the tooth portion opposite to the end portion where the core back portion is provided, having a shoe portion extending in the circumferential direction of the stator in a plan view of the stator; The insulator is A tooth insulating portion facing the tooth portion; A core back insulating portion facing the core back portion; A shoe insulating portion facing the shoe portion; Comprising: The insulator is At a corner formed by the core back insulating portion and the tooth insulating portion in a plan view of the stator, a convex core back side guide portion used to define the position of the conductor when winding the conductor around the tooth portion; At a corner formed by the shoe insulating portion and the tooth insulating portion in a plan view of the stator, a first inclined flange portion and a second inclined flange portion formed in a convex shape and used to define the position of the conductor when winding the conductor around the tooth portion; Comprising: In the circumferential direction of the stator, the first inclined flange portion and the second inclined flange portion are formed at positions opposite to each other via the tooth portion; The first inclined flange portion is A stator protruding toward the side where the core back insulating portion is disposed in the radial direction more than the second inclined flange portion.

2. The first inclined flange portion and the second inclined flange portion are It is formed so as to extend in the circumferential direction of the stator, The first inclined flange portion is, In a plan view of the stator, it has a first inclined surface that inclines so as to be away from the tooth insulating portion as it goes from the outer peripheral side to the inner peripheral side in the radial direction of the stator. The second inclined flange portion is, The stator according to claim 1, having a second inclined surface that inclines so as to be away from the tooth insulating portion as it goes from the outer peripheral side to the inner peripheral side in the radial direction of the stator in a plan view of the stator.

3. Defining the diameter of the conductor constituting the coil as diameter D, In a plan view of the stator, defining the radial length of the core back side guide portion as first length A, When, in a plan view of the stator, defining the length in the direction orthogonal to the radial direction of the core back side guide portion and the length protruding from the tooth portion as second length B, The core back side guide portion is, The first length A forms a relationship of 0 < A < D, and the second length B is formed so as to form a relationship of 0 < B < (√3 × D) / 2. The first inclined surface of the first inclined flange portion is, In a plan view of the stator, it is formed such that the angle α on the outer peripheral side with respect to the radial direction is 120 degrees. The second inclined surface of the second inclined flange portion is, In a plan view of the stator, it is formed such that the angle β on the outer peripheral side with respect to the radial direction is 120 degrees. The insulator is, The stator according to claim 2, wherein the first inclined flange portion is configured to protrude by the first length A of the core back side guide portion toward the arrangement side of the core back insulating portion more than the second inclined flange portion.

4. The coil is, The conductor between the conductor in contact with the core back insulating portion on one first surface side among the pair of first surfaces and the conductor in contact with the core back insulating portion on the other first surface side among the pair of first surfaces is arranged to be orthogonal to the radial direction on each of the pair of second surfaces. The stator according to any one of claims 1 to 3, wherein the conductor between the conductor in contact with the first inclined flange portion and the conductor in contact with the second inclined flange portion is arranged to be orthogonal to the radial direction on each of the pair of second surfaces.

5. The stator according to any one of claims 1 to 3, A rotor provided inside the stator and rotating by magnetic action, An electric motor comprising.

6. The motor according to claim 5, a compression mechanism driven by the motor and compressing the fluid sucked from the outside, a sealed container housing the motor and the compression mechanism, and a compressor comprising the same.

7. The refrigerant used in the compressor is any one of the single refrigerants R1234yf, R1234ze, R32, R290, or a mixed refrigerant of any two or more of these, or a mixed refrigerant of any of these and another refrigerant, or a mixed refrigerant containing R1132(E), or a mixed refrigerant containing R1123. The compressor according to claim 6.

8. The compressor according to claim 6, an outdoor heat exchanger that performs heat exchange between outdoor air and the refrigerant flowing inside, a decompression device that decompresses the refrigerant flowing inside, an indoor heat exchanger that performs heat exchange between indoor air and the refrigerant flowing inside, and a refrigeration cycle device comprising the same.

9. A winding method of a stator used in a motor, a stator core having a core back portion arranged in an annular shape and tooth portions protruding radially from the core back portion, a coil configured such that a conductor with a round cross-section is wound around the tooth portions to form a plurality of layers, an insulator arranged on both end faces of the stator core in the axial direction of the stator and insulating the tooth portions, the core back portion, and the coil, comprising: the tooth portions are arranged in a plurality in the circumferential direction of the stator, and a pair of first faces which are the faces where adjacent tooth portions face each other, and a pair of second faces which are the faces orthogonal to the pair of first faces, and have: the coil in a portion arranged to face each of the pair of first faces, an aligned winding portion where the conductors are wound in an aligned manner and are stacked in adjacent layers, in a portion arranged to face each of the pair of second faces, an intersecting portion where the conductors are wound around the tooth portions obliquely with respect to the radial direction and the conductors of adjacent layers of the conductors are arranged to intersect, in the winding method of the stator having: a first step of winding the conductor around one of the pair of first faces, where the conductor is wound around the tooth portions by aligned winding, a second step of winding the conductor around one of the pair of second faces, where the conductor is wound around the tooth portions by oblique winding in which the conductor is wound around the tooth portions obliquely with respect to the radial direction of the stator. When the conductor is wound around the other one of the pair of first surfaces, a third step in which the conductor is wound around the tooth portion by aligned winding; When the conductor is wound around the other one of the pair of second surfaces, a fourth step in which the conductor is wound around the tooth portion by diagonal winding in which the conductor is wound around the tooth portion obliquely with respect to the radial direction of the stator; including; The coil is formed by repeating the first step, the second step, the third step, and the fourth step, The first step and the third step include a step of forming an aligned winding portion in which the conductor is aligned and wound and is stacked layer by layer in the coil at portions facing each of the pair of first surfaces; The second step and the fourth step include a step of forming an intersection portion in which the conductor is wound obliquely with respect to the radial direction around the tooth portion and the conductors intersect between adjacent layers of the conductor in the coil at portions facing each of the pair of second surfaces; The stator core includes a shoe portion extending in the circumferential direction of the stator in a plan view of the stator at an end portion of the tooth portion opposite to the end portion where the core back portion is provided; The insulator a tooth insulating portion facing the tooth portion; a core back insulating portion facing the core back portion; a shoe insulating portion facing the shoe portion; comprising; The insulator a core back side guide portion formed in a convex shape used to define the position of the conductor when the conductor is wound around the tooth portion at a corner formed by the core back insulating portion and the tooth insulating portion in a plan view of the stator; a first inclined flange portion and a second inclined flange portion formed in a convex shape used to define the position of the conductor when the conductor is wound around the tooth portion at a corner formed by the shoe insulating portion and the tooth insulating portion in a plan view of the stator; comprising; In the circumferential direction of the stator, the first inclined flange portion and the second inclined flange portion are formed at positions opposite to each other via the tooth portion; The first inclined flange portion is a winding method of the stator in which the first inclined flange portion protrudes toward the core back insulating portion side in the radial direction more than the second inclined flange portion, in the feed winding which is the first layer winding of the conductor, Start winding the conductor in a state where it is in contact with the core back insulation part and the tooth insulation part, make it contact with the surface on the arrangement side of the shoe insulation part of the core back side guide part, and then wind the conductor around the tooth part along the radial direction. After the wound conductor contacts the first inclined flange part and the tooth insulation part, on the surface of the second surface, wind the conductor so as to be orthogonal to the radial direction. A winding method in which, after the conductor wound orthogonally contacts the second inclined flange part, start the return winding which is the second layer winding of the conductor.

10. In the return winding which is the second layer winding of the conductor, after the conductor contacts the core back insulation part, on the surface of the second surface, wind the conductor so as to be orthogonal to the radial direction. The winding method according to claim 9, wherein while making the conductor wound orthogonally contact the core back insulation part, start the forward winding which is the winding of the third layer of the conductor.