Motors, compressors, and refrigeration systems

Abstract

The present invention provides a motor, compressor, and refrigeration device that are connected by a delta connection and capable of mitigating the potential difference between adjacent winding sections. [Solution] The motor has first to third teeth sections arranged in this order in the circumferential direction of the yoke section, and first to third coils connected by a delta connection. The second coil is wound around the second teeth section in a winding direction opposite to that of the first and third coils. The first coil has a first winding section and a second winding section wound on top of the first winding section. The second coil has a third winding section and a fourth winding section wound on top of the third winding section. The third coil has a fifth winding section and a sixth winding section wound on top of the fifth winding section. The second and fourth winding sections are connected to a first lead wire, and the third and fifth winding sections are connected to a second lead wire. No insulating member is placed between the second and fourth winding sections, while an insulating member is placed between the fourth and sixth winding sections.

Description

Technical Field

[0001] The present disclosure relates to a motor, a compressor, and a refrigeration device.

Background Art

[0002] Conventionally, there has been a rotating electrical machine including a rotor, a stator having a stator core, and a stator coil composed of a plurality of concentrated windings wound around each tooth of the stator core. The ratio of the number of poles of the rotor to the number of slots of the stator is (6±2)n:6n (where n is an integer of 1 or more). The plurality of concentrated windings are configured by alternately arranging, in the circumferential direction, a first concentrated winding wound around the teeth such that the neutral point connection side terminal is located on the inner diameter side and the external connection side terminal is located on the outer diameter side, and a second concentrated winding wound around the teeth such that the neutral point connection side terminal is located on the outer diameter side and the external connection side terminal is located on the inner diameter side. In this rotating electrical machine, the plurality of concentrated windings are connected in a Y connection (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in a conventional rotating electrical machine (motor), the potential difference is alleviated between adjacent concentrated windings (winding portions) among the plurality of concentrated windings connected in a Y connection, but it cannot be used for a delta connection.

[0005] Therefore, an object is to provide a motor, a compressor, and a refrigeration device that are connected in a delta connection and can alleviate the potential difference between adjacent winding portions.

Means for Solving the Problems

[0006] The motor of the first embodiment is A rotor configured to rotate around the axis of rotation, A stator comprising: a cylindrical yoke portion arranged around the axis; a stator core having first teeth, second teeth, and third teeth portions extending radially from the yoke portion toward the rotor and arranged circumferentially in the yoke portion; and a stator having first coils, second coils, and third coils connected by a delta connection; A first lead wire connected to a first connection point to which the first coil and the second coil are connected, A second lead wire connected to a second connection point to which the second coil and the third coil are connected, A third lead wire connected to a third connection point to which the third coil and the first coil are connected, Includes, The first tooth portion, the second tooth portion, and the third tooth portion are arranged in this order in the circumferential direction of the yoke portion. The first coil is composed of a first conductor wound around the first teeth portion, The second coil is composed of a second conductor wound around the second teeth in a winding direction opposite to that of the first conductor. The third coil is composed of a third conductor wound around the third teeth in the same direction as the winding direction of the first conductor. The first coil has a first winding portion wound around the first teeth portion and a second winding portion wound on top of the first winding portion. The second coil has a third winding portion wound around the second teeth portion and a fourth winding portion wound on top of the third winding portion. The third coil has a fifth winding portion wound around the third teeth portion and a sixth winding portion wound on top of the fifth winding portion. The second winding portion and the fourth winding portion are connected to the first connection point. The third winding portion and the fifth winding portion are connected to the second connection point. No insulating member is placed between the second winding portion and the fourth winding portion. An insulating member is placed between the fourth winding portion and the sixth winding portion of the motor.

[0007] According to the first embodiment, the connections are made in a delta configuration, and the potential difference between adjacent windings can be mitigated.

[0008] The motor of the second embodiment is the motor of the first embodiment, The stator core has a fourth tooth portion, a fifth tooth portion, and a sixth tooth portion arranged in the circumferential direction of the yoke portion, The stator includes a fourth coil connected to the first connection point and the third connection point, a fifth coil connected to the first connection point and the second connection point, and a sixth coil connected to the second connection point and the third connection point. The first tooth portion, the second tooth portion, the third tooth portion, the fourth tooth portion, the fifth tooth portion, and the sixth tooth portion are arranged in this order in the circumferential direction of the yoke portion. The fourth coil is composed of a fourth conductor wound around the fourth teeth in a winding direction opposite to that of the first conductor. The fifth coil is composed of a fifth conductor wound around the fifth teeth in the same direction as the winding direction of the first conductor. The sixth coil is composed of a sixth conductor wound around the sixth teeth in a winding direction opposite to that of the first conductor, The fourth coil has a seventh winding portion wound around the fourth teeth portion and an eighth winding portion wound on top of the seventh winding portion. The fifth coil has a ninth winding portion wound around the fifth teeth portion and a tenth winding portion wound on top of the ninth winding portion. The sixth coil has an eleventh winding portion wound around the sixth teeth portion and a twelfth winding portion wound on top of the eleventh winding portion. The sixth winding section and the eighth winding section are connected to the third connection point. The seventh winding section and the ninth winding section are connected to the first connection point. The 10th winding section and the 12th winding section are connected to the second connection point. No insulating member is placed between the sixth winding portion and the eighth winding portion. An insulating member is placed between the eighth winding portion and the tenth winding portion. No insulating member is placed between the 10th winding portion and the 12th winding portion.

[0009] According to the second embodiment, there are two or more sets of three teeth sections and three coils corresponding to three phases, and in a configuration including an even number of sets or an odd number of sets, they are connected in a delta connection, and the potential difference between adjacent winding sections can be mitigated.

[0010] The motor of the third embodiment is the motor of the second embodiment, The stator includes one or more sets of the first tooth portion, the second tooth portion, the third tooth portion, the fourth tooth portion, the fifth tooth portion, and the sixth tooth portion, and the first coil, the second coil, the third coil, the fourth coil, the fifth coil, and the sixth coil, The first tooth portion and the sixth tooth portion are arranged adjacent to each other in the circumferential direction of the yoke portion. The first winding portion and the eleventh winding portion are connected to the third connection point. An insulating member is placed between the second winding portion and the twelfth winding portion.

[0011] According to the third embodiment, in a configuration in which there are two or more even-numbered sets of three teeth sections and three coils corresponding to three phases, or in a configuration in which there are five or more odd-numbered sets of three teeth sections and three coils corresponding to three phases, when the first tooth section and the sixth tooth section are arranged adjacent to each other in the circumferential direction of the yoke section, they are connected by a delta connection, and the potential difference between adjacent winding sections can be mitigated.

[0012] The motor of the fourth embodiment is a motor of any one of the first to third embodiments, The stator includes one or more sets of the first tooth portion, the second tooth portion, and the third tooth portion, and the first conductor, the second conductor, and the third conductor. At least one of the first tooth portion and the third tooth portion is arranged adjacent to each other in the circumferential direction of the yoke portion. The first winding portion and the sixth winding portion are connected to the third connection point. An insulating member is disposed between the second winding portion and the sixth winding portion. [[ID=***]]

[0013] According to the fourth aspect, in a configuration including an odd number of sets of three tooth portions corresponding to three phases and three coils, when at least one of the first tooth portion and the third tooth portion is arranged adjacent to each other in the circumferential direction of the yoke portion, it is connected in a delta connection and can relax the potential difference between adjacent winding portions.

[0014] The compressor according to the fifth aspect is a compressor equipped with the motor according to the first aspect.

[0015] According to the fifth aspect, it is possible to provide a compressor equipped with a motor that is connected in a delta connection and can relax the potential difference between adjacent winding portions.

[0016] The refrigeration device according to the sixth aspect is a refrigeration device equipped with the compressor according to the fifth aspect.

[0017] According to the sixth aspect, it is possible to provide a refrigeration device equipped with a compressor including a motor that is connected in a delta connection and can relax the potential difference between adjacent winding portions.

Brief Description of the Drawings

[0018] [Figure 1] It is a diagram showing an example of the piping system of the air conditioner 1. [Figure 2] It is a cross-sectional view showing an example of the compressor 200 of the present embodiment. [Figure 3] It is a diagram schematically showing an example of the cross-sectional shape of the motor 100. [Figure 4]This diagram shows an example of a delta connection for coils 112V1 to 112W2. [Figure 5] This figure shows an example of the winding direction of the coil 112 wound around the stator 110. [Figure 6A] This figure shows an example of how to wind coil 112 and its winding direction. [Figure 6B] This figure shows an example of how to wind coil 112 and its winding direction. [Figure 7A] This figure shows an example of the configuration of coil 12V and coil 12U in a motor used for comparison. [Figure 7B] Figure 7A shows an example of a delta connection of the three-phase coils of a motor used for comparison. [Figure 8] This figure shows an example of a delta connection for the three-phase coils of motor 100. [Figure 9] This figure shows an example of a modified winding method for the coil 112 in the stator 110 of the motor 100. [Figure 10] This figure shows an example configuration of the 8-pole, 12-slot motor 100M1. [Figure 11] This figure shows an example configuration of a 6-pole, 9-slot motor 100M2. [Figure 12] This diagram shows an example of a delta connection for the coils 112V1 to 112W3 of motor 100M2. [Modes for carrying out the invention]

[0019] The following describes embodiments to which the motor, compressor, and refrigeration system of this disclosure are applied.

[0020] <Embodiment> As an embodiment, an example of an air conditioning system that provides cooling and heating to a room will be described. Figure 1 is a diagram showing an example of the piping system of the air conditioning system 1. As shown in Figure 1, the air conditioning system 1 includes a refrigerant circuit 50. The air conditioning system 1 is an example of a refrigeration system. The air conditioning system may be a cooling-only unit, a heating-only unit, or an air conditioning system that switches between cooling and heating.

[0021] In addition to the refrigerant circuit 50, the air conditioning system 1 includes a power converter that converts the voltage supplied from the AC power source into a three-phase AC voltage and supplies it to the motor 100, and a control device that controls the drive of the power converter, but these are omitted here.

[0022] <Refrigerant Circuit> The refrigerant circuit 50 is a closed circuit filled with refrigerant. The refrigerant circuit 50 is equipped with a compressor 200, a four-way switching valve 60, an outdoor heat exchanger 70, an expansion valve 80, and an indoor heat exchanger 90.

[0023] Various types of compressors can be used for the compressor 200. For example, the compressor 200 is a rotary type compressor. The compressor 200 may also be a scroll type, screw type, or turbo type compressor. The compressor 200 includes a motor 100. The motor 100 is, for example, an embedded magnet type motor or a surface magnet type motor. Three-phase AC power is supplied to the motor 100 from a power converter.

[0024] The outdoor heat exchanger 70 is a heat exchanger that exchanges heat between outdoor air and refrigerant. The indoor heat exchanger 90 is a heat exchanger that exchanges heat between indoor air and refrigerant. The expansion valve 80 is a so-called electronic expansion valve.

[0025] The four-way directional control valve 60 is a valve having first to fourth ports. The four-way directional control valve 60 can be switched between a first state (shown by a solid line in Figure 1) and a second state (shown by a dashed line in Figure 1). In the first state, the first port communicates with the third port and the second port communicates with the fourth port. In the second state, the first port communicates with the fourth port and the second port communicates with the third port.

[0026] In the refrigerant circuit 50, the discharge port of the compressor 200 is connected to the first port of the four-way directional control valve 60, and the suction port is connected to the second port of the four-way directional control valve 60. In the refrigerant circuit 50, the outdoor heat exchanger 70, expansion valve 80, and indoor heat exchanger 90 are arranged in order from the third port to the fourth port of the four-way directional control valve 60. In the air conditioning system 1, the four-way directional control valve 60 is switched when switching between cooling operation and heating operation.

[0027] Figure 2 shows a cross-sectional view of an example of the compressor 200 of this embodiment. The compressor 200 is installed, for example, in the refrigerant circuit (not shown) of an air conditioning system. The compressor 200 compresses the refrigerant in the refrigerant circuit. As shown in Figure 2, the compressor 200 includes a motor 100, a compression mechanism 3, and a casing 4.

[0028] The casing 4 is a container that houses the compression mechanism 3 and the motor 100. The casing 4 is a support member that supports the stator 110 of the motor 100. The rotating shaft 101 of the motor 100 is connected to the compression mechanism 3. The lower end of the rotating shaft 101 is rotatably held by a bearing 3a provided at the lower end of the compression mechanism 3. No bearing is provided at the upper end of the rotating shaft 101.

[0029] Casing 4 is a sealed container. Casing 4 is made of a metal such as iron. Casing 4 can be formed, for example, by applying a so-called roll process to a metal plate (such as a sheet of iron) to form a cylindrical member, and then welding end plates (made of metal such as iron) to both ends of the cylindrical member.

[0030] The compression mechanism 3 compresses the fluid (refrigerant in this example). Various fluid machinery can be used for the compression mechanism 3. For example, a rotary compression mechanism, a scroll compression mechanism, etc., can be used for the compression mechanism 3. In this example, the compression mechanism 3 draws in fluid from the suction pipe 3b provided on the side of the casing 4 and discharges the compressed fluid into the casing 4. The refrigerant fluid discharged into the casing 4 is then discharged through the discharge pipe 3c.

[0031] <Motor 100 Configuration> Motor 100 is an example of a rotating electric machine. Motor 100 drives the compression mechanism 3. Figure 3 schematically shows an example of the cross-sectional shape of motor 100. Motor 100 is a rotary electric machine of the embedded magnet type. However, this is just an example, and it may also be a rotary electric machine of the surface magnet type. As shown in Figure 3, motor 100 includes a stator 110, a rotor 120, and a rotating shaft 101. In Figure 3, the casing 4 is omitted, but the casing 4 may also be considered as part of motor 100.

[0032] The rotating shaft 101 is a support member that supports the rotor 120. The rotating shaft 101 is made of a metal such as iron. The rotating shaft 101 is also connected to the compression mechanism 3.

[0033] In the following explanation, "axial direction" refers to the direction in which the axis of the rotation axis 101 extends, and is equal to the direction in which the central axes of the stator 110 and rotor 120 surrounding the rotation axis 101 extend. "Radial direction" refers to the direction perpendicular to the axial direction, and means the radial direction of the rotation axis 101, stator 110, and rotor 120. "Circumferential direction" refers to the circumferential direction of the rotation axis 101, stator 110, and rotor 120. "Outer circumference side" refers to the side away from the axis. "Inner circumference side" refers to the side close to the axis. Furthermore, "axial view" refers to viewing in the axial direction.

[0034] <Stata 110> The stator 110 includes a stator core 111, coils 112V1, 112U1, 112W1, 112V2, 112U2, 112W2, and insulating member 115.

[0035] The six coils 112V1, 112U1, 112W1, 112V2, 112U2, and 112W2 are wound around the teeth 111B of the V1, U1, W1, V2, U2, and W2 phases, respectively.

[0036] Coil 112V1 for the V1 phase is an example of the first coil, coil 112U1 for the U1 phase is an example of the second coil, and coil 112W1 for the W1 phase is an example of the third coil. Coil 112V2 for the V2 phase is an example of the fourth coil, coil 112U2 for the U2 phase is an example of the fifth coil, and coil 112W2 for the W2 phase is an example of the sixth coil.

[0037] The teeth portions 111B of the V1, U1, W1, V2, U2, and W2 phases are examples of the first, second, third, fourth, fifth, and sixth teeth portions, respectively.

[0038] In the following, coils 112V1, 112U1, 112W1, 112V2, 112U2, and 112W2 may be referred to as coils 112V1 to 112W2. Furthermore, when no particular distinction is made between coils 112V1, 112U1, 112W1, 112V2, 112U2, and 112W2, they will simply be referred to as coil 112.

[0039] <Stator Core 111> The stator core 111 is constructed by stacking numerous plate members in the axial direction. The stator core 111 is a so-called laminated core. The numerous plate members constituting the stator core 111 are made of, for example, electrical steel sheets. Each plate member can be manufactured, for example, by pressing or laser processing the electrical steel sheet. When manufacturing the stator core 111, the numerous plate members are fixed to each other, for example, by crimping or welding. The stator core 111 may also be made of a soft magnetic material other than electrical steel sheets. For example, the stator core 111 may be made of an amorphous alloy, a nanocrystalline material, or a material containing a compacted magnetic core. The stator core 111 may be a single core or a segmented core. A single core is a core that is not divided in a direction perpendicular to the axial direction. A segmented core is a core that is divided in a direction perpendicular to the axial direction.

[0040] The stator core 111 has one back yoke portion 111A, multiple teeth portions 111B, and coil slots 111C. The back yoke portion 111A is an example of a yoke portion.

[0041] The back yoke portion 111A is the outer peripheral portion of the stator core 111 and is a cylindrical member.

[0042] Each tooth portion 111B is a part that protrudes from the inner circumference of the back yoke portion 111A and extends toward the axial center. In this example, there are six tooth portions 111B. Six coils 112V1 to 112W2 are wound around each of the six tooth portions 111B, for example, using a concentrated winding method.

[0043] The six coil slots 111C are spaces between adjacent teeth 111B and are slots for housing coils 112V1 to 112W2, respectively.

[0044] <Coil 112> Coil 112 is provided one at each tooth section 111B, and is wound around the tooth section 111B, for example, in a concentrated winding method. Coil 112 is made of a conductor such as magnet wire. Coils 112V1 to 112W2 are wound around the six tooth sections 111B in the order of coil 112V1, 112U1, 112W1, 112V2, 112U2, and 112W2 in a counterclockwise direction, as shown in Figure 3 as an example. Coil 112V1 and coil 112W2 are arranged adjacent to each other in the circumferential direction.

[0045] The winding directions of coils 112V1, 112U1, 112W1, 112V2, 112U2, and 112W2 are such that, when viewed from the axial side of the teeth portion 111B (radially inward of the back yoke portion 111A), coils 112 wound clockwise and coils 112 wound counterclockwise are alternately arranged in the circumferential direction of the stator core 111.

[0046] For example, the counterclockwise winding direction is referred to as the forward direction, and the clockwise winding direction is referred to as the reverse direction. In Figure 3, the symbols of the coils 112U1, 112V2, and 112W2 wound in the reverse direction on the teeth portion 111B are accompanied by "(reverse)". Here, we will describe a configuration where the counterclockwise winding direction is the forward direction and the clockwise winding direction is the reverse direction, but it is also possible for the clockwise winding direction to be the forward direction and the counterclockwise winding direction to be the reverse direction.

[0047] Coils 112V1, 112W1, and 112U2 are wound in the forward direction on the teeth section 111B because they do not have a (reverse) indication. Coils 112U1, 112V2, and 112W2 are wound in the reverse direction on the teeth section 111B because they have a (reverse) indication.

[0048] The coils 112V1 to 112W2, which are wound alternately in the forward and reverse directions, are connected by connections 112A and 112B such that all coils 112 for the V1, U1, W1, V2, U2, and W2 phases are wound in the forward direction and the direction of the magnetic flux generated by energization is the same.

[0049] Coils 112V1 and 112U1 are connected by wiring 112A, and coils 112U1 and 112W1 are connected by wiring 112B. Coils 112W1 and 112V2 are connected by wiring 112A, and coils 112V2 and 112U2 are connected by wiring 112B. Coils 112U2 and 112W2 are connected by wiring 112A, and coils 112W2 and 112V1 are connected by wiring 112B. Further details will be described later using Figure 4.

[0050] The insulating members 115 are provided every other of the six coil slots 111C. Therefore, the stator 110 has, for example, three insulating members 115. The insulating members 115 are provided to ensure insulation when there is a large potential difference between two adjacent coils 112 wound in a common coil slot 111C.

[0051] The insulating member 115 is provided in the coil slot 111C where the coils 112 are connected by a connection 112B, but not in the coil slot 111C where the coils 112 are connected by a connection 112A. The three insulating members 115 are provided, as an example, in the coil slot 111C between coils 112U1 and 112W1, the coil slot 111C between coils 112V2 and 112U2, and the coil slot 111C between coil 112W2 and coil 112V1.

[0052] Furthermore, the insulating member 115 is not provided in the coil slot 111C between coils 112V1 and 112U1, the coil slot 111C between coils 112W1 and 112V2, and the coil slot 111C between coils 112U2 and 112W2.

[0053] The insulating member 115 is provided in coil slots 111C where the potential difference between the two coils 112 located on both sides of the coil slot 111C is greater than a predetermined value, and is not provided in coil slots 111C where the potential difference between the two coils 112 located on both sides of the coil slot 111C is sufficiently smaller than a predetermined value.

[0054] In a coil slot 111C where two coils 112 are connected by a connection 112B, an insulating member 115 is provided because the potential difference between the two coils 112 is greater than a predetermined value. In contrast, in a coil slot 111C where two coils 112 are connected by a connection 112A, the insulating member 115 is unnecessary because the potential difference between the two coils 112 is sufficiently smaller than a predetermined value. For this reason, the insulating member 115 can be omitted in a coil slot 111C where two coils 112 are connected by a connection 112A. A coil slot 111C where two coils 112 are connected by a connection 112A is a coil slot 111C in which the potential difference between the two coils 112 is mitigated.

[0055] The specified value should be a value that allows for the distinction of whether or not dielectric breakdown occurs. As an example of a condition where dielectric strength is critical, consider the case where coils are in physical contact with each other. In this case, a spatial distance equal to the thickness of the insulating coating between the coils is ensured. If the potential difference does not cause dielectric breakdown at that spatial distance, the insulating member 115 is unnecessary; however, if the potential difference is greater than that, the insulating member 115 is required.

[0056] The insulating member 115 is formed from an insulating material such as polyethylene terephthalate (PET), liquid crystal polymer (LCP), or aramid fiber. The insulating member 115 is provided in the three coil slots 111C described above to insulate the two coils 112 from each other.

[0057] <Rotor 120> The rotor 120 includes a rotor core 121 and permanent magnets 122. The rotor core 121 includes a through hole 121A into which the rotating shaft 101 is inserted and slots 121B for housing the permanent magnets 122. Slots 121B are an example of a magnet housing. In this example, the rotor 120 includes four permanent magnets 122. Here, as an example, a 4-pole, 6-slot type motor 100 is described in which the stator 110 includes six teeth 111B and the rotor 120 includes four permanent magnets 122, but the number of teeth 111B and permanent magnets 122 is not limited to these. The motor 100 is a concentrated winding type, and it is sufficient that the number of teeth 111B and permanent magnets 122 are different.

[0058] The rotor core 121 is constructed by stacking numerous plate members in the axial direction. The rotor core 121 is a so-called laminated core. The plate members are made of electrical steel sheets. The plate members can be manufactured, for example, by pressing or laser processing electrical steel sheets. When manufacturing the rotor core 121, the numerous plate members are fixed to each other, for example, by crimping or welding. The rotor core 121 has a through hole 121A that penetrates the center in the axial direction when viewed in the axial direction. The rotating shaft 101 is fixed to the through hole 121A by press-fitting or shrink-fitting. The rotor core 121 may be made of a soft magnetic material other than electrical steel sheets. For example, the rotor core 121 may be made of an amorphous alloy, a nanocrystalline material, or a material containing a compacted magnetic core.

[0059] The permanent magnets 122 are housed in slots 121B. Here, as an example, we describe a configuration in which the permanent magnets 122 are rectangular parallelepipeds, and four permanent magnets 122 are arranged along the four sides of a square surrounding the through-hole 121A of the rotor core 121 in an axial view. The four permanent magnets 122 are arranged point-symmetrically with respect to the central axis of the through-hole 121A. However, the permanent magnets 122 are not limited to this arrangement, and may be arranged in a V-shape, a nabla (∇) shape, a spoke shape, etc.

[0060] <Delta connection of coil 112> Figure 4 shows an example of a delta connection of coils 112V1 to 112W2. In addition to coils 112V1 to 112W2, Figure 4 also shows the first connection point 113A, the second connection point 113B, the third connection point 113C, the first lead wire 114A, the second lead wire 114B, and the third lead wire 114C.

[0061] The first connection point 113A, the second connection point 113B, and the third connection point 113C are connected to the first lead line 114A, the second lead line 114B, and the third lead line 114C, respectively. The first lead line 114A, the second lead line 114B, and the third lead line 114C are lead lines for the U phase, W phase, and V phase, respectively.

[0062] Coils 112V1 and 112V2 are connected in parallel between the first connection point 113A and the third connection point 113C. Coils 112U1 and 112U2 are connected in parallel between the second connection point 113B and the first connection point 113A. Coils 112W1 and 112W2 are connected in parallel between the third connection point 113C and the second connection point 113B.

[0063] Coils 112V1 and 112V2, coils 112U1 and 112U2, and coils 112W1 and 112W2 are connected in a delta connection between the first connection point 113A, the second connection point 113B, and the third connection point 113C.

[0064] Coil 112V1 is composed of a conductor (an example of the first conductor) connecting the first connection point 113A and the third connection point 113C, and has windings Va, Vb, and Vc. The windings Va, Vb, and Vc of coil 112V1 are connected in series in the order Va, Vb, and Vc, from the third connection point 113C side toward the first connection point 113A side. Coil 112V1 is wound in the forward direction around the teeth portion 111B. Winding Va of coil 112V1 is an example of the first winding, and winding Vc of coil 112V1 is an example of the second winding. Note that the parts of coil 112V1 other than the windings Va, Vb, and Vc are connections.

[0065] Coil 112U1 is composed of a conductor (an example of a second conductor) connecting the second connection point 113B and the first connection point 113A, and has winding sections Ua, Ub, and Uc. The winding sections Ua, Ub, and Uc of coil 112U1 are connected in series in the order Uc, Ub, and Ua, from the first connection point 113A side toward the second connection point 113B side. Coil 112U1 is wound in the reverse direction around the teeth section 111B. Winding section Ua of coil 112U1 is an example of a third winding section, and winding section Uc of coil 112U1 is an example of a fourth winding section. Note that the parts of coil 112U1 other than the winding sections Ua, Ub, and Uc are connections.

[0066] Coil 112W1 is composed of a conductor (an example of a third conductor) connecting the third connection point 113C and the second connection point 113B, and has winding sections Wa, Wb, and Wc. The winding sections Wa, Wb, and Wc of coil 112W1 are connected in series in the order Wa, Wb, and Wc from the second connection point 113B side toward the third connection point 113C side. Coil 112W1 is wound in the forward direction around the teeth section 111B. Winding section Wa of coil 112W1 is an example of a fifth winding section, and winding section Wc of coil 112W1 is an example of a sixth winding section. Note that the parts of coil 112W1 other than the winding sections Wa, Wb, and Wc are connections.

[0067] Coil 112V2 is composed of a conductor (an example of a fourth conductor) connecting the first connection point 113A and the third connection point 113C, and has windings Va, Vb, and Vc. The windings Va, Vb, and Vc of coil 112V2 are connected in series in the order Vc, Vb, and Va, from the third connection point 113C side toward the first connection point 113A side. Coil 112V2 is wound in the reverse direction around the teeth portion 111B. Winding Va of coil 112V2 is an example of a seventh winding, and winding Vc of coil 112V2 is an example of an eighth winding. Note that the parts of coil 112V2 other than the windings Va, Vb, and Vc are connections.

[0068] Coil 112U2 is composed of a conductor (an example of a fifth conductor) connecting the second connection point 113B and the first connection point 113A, and has winding sections Ua, Ub, and Uc. The winding sections Ua, Ub, and Uc of coil 112U2 are connected in series in the order Ua, Ub, and Uc, from the first connection point 113A side toward the second connection point 113B side. Coil 112U2 is wound in the forward direction around the teeth section 111B. Winding section Ua of coil 112U2 is an example of a ninth winding section, and winding section Uc of coil 112U2 is an example of a tenth winding section. Note that the parts of coil 112U2 other than the winding sections Ua, Ub, and Uc are connections.

[0069] Coil 112W2 is composed of a conductor (an example of a sixth conductor) connecting the third connection point 113C and the second connection point 113B, and has winding sections Wa, Wb, and Wc. The winding sections Wa, Wb, and Wc of coil 112W2 are connected in series in the order Wc, Wb, and Wa, from the second connection point 113B side toward the third connection point 113C side. Coil 112W2 is wound in the reverse direction around the teeth section 111B. Winding section Wa of coil 112W2 is an example of an eleventh winding section, and winding section Wc of coil 112W2 is an example of a twelfth winding section. Note that the parts of coil 112W2 other than the winding sections Wa, Wb, and Wc are connections.

[0070] The winding portion Vc of coil 112V1 and the winding portion Uc of coil 112U1 are connected to the first connection point 113A. The winding portion Ua of coil 112U1 and the winding portion Wa of coil 112W1 are connected to the second connection point 113B. The winding portion Wc of coil 112W1 and the winding portion Va of coil 112V1 are connected to the third connection point 113C.

[0071] An insulating member 115 is not placed between the winding portion Vc of coil 112V1 and the winding portion Uc of coil 112U1. An insulating member 115 is placed between the winding portion Uc of coil 112U1 and the winding portion Wc of coil 112W1. An insulating member 115 is placed between the winding portion Wc of coil 112W2 and the winding portion Vc of coil 112V1.

[0072] Furthermore, the winding portion Wc of coil 112W1 and the winding portion Vc of coil 112V2 are connected to the third connection point 113C. The winding portion Va of coil 112V2 and the winding portion Ua of coil 112U2 are connected to the first connection point 113A. The winding portion Uc of coil 112U2 and the winding portion Wc of coil 112W2 are connected to the second connection point 113B.

[0073] An insulating member 115 is not placed between the winding portion Wc of coil 112W1 and the winding portion Vc of coil 112V2. An insulating member 115 is placed between the winding portion Vc of coil 112V2 and the winding portion Uc of coil 112U2. An insulating member 115 is not placed between the winding portion Uc of coil 112U2 and the winding portion Wc of coil 112W2.

[0074] Furthermore, as shown in Figure 4, connections 112A and 112B are included in the parts of coils 112V1 to 112W2 other than the winding sections Va, Vb, Vc, Ua, Ub, Uc, Wa, Wb, and Wc. There are three of each connection 112A and 112B.

[0075] Specifically, connection 112A exists between the winding portion Vc of coil 112V1 and the winding portion Uc of coil 112U1. This connection 112A extends across coils 112V1 and 112U1 and is composed of a portion of coil 112V1 and a portion of coil 112U1. Also, connection 112A exists between the winding portion Wc of coil 112W1 and the winding portion Vc of coil 112V2. This connection 112A extends across coils 112W1 and 112V2 and is composed of a portion of coil 112W1 and a portion of coil 112V2. Furthermore, connection 112A exists between the winding portion Uc of coil 112U2 and the winding portion Wc of coil 112W2. This connection 112A extends across coils 112U2 and 112W2 and consists of a portion of coil 112U2 and a portion of coil 112W2.

[0076] Connection 112B exists between the winding portion Ua of coil 112U1 and the winding portion Wa of coil 112W1. This connection 112B extends across coils 112U1 and 112W1 and is composed of a portion of coil 112U1 and a portion of coil 112W1. Also, connection 112B exists between the winding portion Va of coil 112V2 and the winding portion Ua of coil 112U2. This connection 112B extends across coils 112V2 and 112U2 and is composed of a portion of coil 112V2 and a portion of coil 112U2. Furthermore, connection 112B exists between the winding portion Wa of coil 112W2 and the winding portion Va of coil 112V1. This connection 112B extends across coils 112W2 and 112V1 and consists of a portion of coil 112W2 and a portion of coil 112V1.

[0077] In this description, we have explained a configuration in which each coil 112 has three winding sections. However, each coil 112 may also have a configuration with two winding sections. In this case, the winding section Vb is removed from coils 112V1 and 112V2, the winding section Ub is removed from coils 112U1 and 112U2, and the winding section Wb is removed from coils 112W1 and 112W2 as shown in Figure 4.

[0078] Furthermore, each coil may have four or more winding sections. In this case, the number of winding sections Vb for coils 112V1 and 112V2, Ub for coils 112U1 and 112U2, and Wb for coils 112W1 and 112W2 in Figure 4 will be increased to two or more. In this case, the connection relationships between the winding sections Va and Vc of coils 112V1 and 112V2, the winding sections Ua and Uc of coils 112U1 and 112U2, and the winding sections Wa and Wc of coils 112W1 and 112W2 will be the same as the connection relationships shown in Figure 4. Also, the position where the insulating member 115 is provided will be the same as the position shown in Figure 3.

[0079] <Winding direction of coil 112> Figure 5 shows an example of the winding direction of the coil 112 wound around the stator 110. Figures 6A and 6B show examples of the winding method and winding direction of the coil 112. Figure 6A shows an example of the forward winding direction, and Figure 6B shows an example of the reverse winding direction. Figures 5, 6A, and 6B show the cross-sectional structure corresponding to the stator 110 shown in Figure 3, but the hatching is omitted.

[0080] Note that the connections 112A and 112B in Figure 5 are shown to illustrate the electrical connection relationship between the coils 112 and do not represent the actual arrangement of the conductors that make up connections 112A and 112B on the stator core 111. Also, the insulating member 115 (see Figure 3) is omitted in Figures 5, 6A, and 6B.

[0081] The windings Va, Vb, and Vc of coils 112V1 and 112V2 are wound around the teeth portion 111B in the order of Va, Vb, and Vc. More specifically, windings Va is wound around the outer surface of the teeth portion 111B, windings Vb is wound on top of windings Va, and windings Vc is wound on top of windings Vb. The same applies to windings Ua, Ub, and Uc of coils 112V1 and 112U2, and windings Wa, Wb, and Wc of coils 112W1 and 112W2, where they are wound around the outer surface of the teeth portion 111B in the order of subscripts a, b, and c.

[0082] Figures 5, 6A, and 6B show the starting point S and ending point E of each coil 112. The starting point S is the point where the coil 112 begins to be wound around the teeth portion 111B, and the ending point is the point where the coil 112 finishes winding around the teeth portion 111B.

[0083] Coils 112V1, 112W1, and 112U2 are wound in the forward direction relative to the teeth portion 111B. Here, the winding direction of coil 112V1 will be explained using Figure 6A.

[0084] As shown in Figure 6A, the coil 112V1 is wound around the teeth portion 111B from a starting point S located on the outer end side of the teeth portion 111B in the radial direction of the back yoke portion 111A, on the coil 112W2 side relative to the teeth portion 111B. When viewing the teeth portion 111B from the axial side, the coil 112V1 is wound around the teeth portion 111B in a counterclockwise direction. As indicated by the arrows in the cross-sections of the winding portions Va, Vb, and Vc, first, the winding portion Va of the coil 112V1 is wound along the surface of the teeth portion 111B toward the radially inward side of the back yoke portion 111A, then the winding portion Vb is wound on top of the winding portion Va toward the radially outward side of the back yoke portion 111A, and then the winding portion Vc is wound on top of the winding portion Vb toward the radially inward side of the back yoke portion 111A. The endpoint E of coil 112V1 is the endpoint of the winding portion Vc, located on the inner end side of the teeth portion 111B in the radial direction of the back yoke portion 111A, and on the coil 112U1 side relative to the teeth portion 111B. This winding direction is, for example, the forward direction. The same applies to coils 112W1 and 112U2.

[0085] Furthermore, coils 112U1, 112V2, and 112W2 are wound in the opposite direction to the teeth portion 111B. Here, the winding direction of coil 112U1 will be explained using Figure 6B.

[0086] As shown in Figure 6B, the coil 112U1 is wound around the teeth portion 111B from a starting point S located on the coil 112W1 side relative to the teeth portion 111B, on the outer end side of the teeth portion 111B in the radial direction of the back yoke portion 111A. When viewing the teeth portion 111B from the axial side, the coil 112U1 is wound around the teeth portion 111B in a clockwise direction. As indicated by the arrows in the cross-sections of the winding portions Ua, Ub, and Uc, first, the winding portion Va of the coil 112U1 is wound along the surface of the teeth portion 111B toward the radially inward side of the back yoke portion 111A, then the winding portion Vb is wound on top of the winding portion Va toward the radially outward side of the back yoke portion 111A, and then the winding portion Vc is wound on top of the winding portion Vb toward the radially inward side of the back yoke portion 111A. The endpoint E of coil 112U1 is the endpoint of the winding portion Vc, located on the inner end side of the teeth portion 111B in the radial direction of the back yoke portion 111A, and on the coil 112V1 side relative to the teeth portion 111B. This winding direction is, for example, the reverse direction. The same applies to coils 112V2 and 112W2.

[0087] As explained above using Figures 5, 6A, and 6B, coils 112V1, 112W1, and 112U2 are wound in the forward direction relative to the teeth portion 111B, while coils 112U1, 112V2, and 112W2 are wound in the reverse direction relative to the teeth portion 111B.

[0088] Furthermore, the coil 112U1, which is wound in the opposite direction to the teeth portion 111B, has the connection order of winding portions Ua and Uc reversed compared to the coil 112U2, which is wound in the forward direction to the teeth portion 111B, as shown in Figure 4. Similarly, the coil 112V2, which is wound in the opposite direction to the teeth portion 111B, has the connection order of winding portions Va and Vc reversed compared to the coil 112V1, which is wound in the forward direction to the teeth portion 111B, as shown in Figure 4. Also, the coil 112W2, which is wound in the opposite direction to the teeth portion 111B, has the connection order of winding portions Wa and Wc reversed compared to the coil 112W1, which is wound in the forward direction to the teeth portion 111B, as shown in Figure 4.

[0089] In a typical delta-connected motor, all coils are wound in the forward direction relative to the teeth, and the start and end points of adjacent coils are connected.

[0090] In the motor 100 of this embodiment, as described above, for the coils 112U1, 112V2, and 112W2 that are wound in the opposite direction to the teeth portion 111B, the connection order of the winding portions Va and Vc, Ua and Uc, and Wa and Wc is reversed so that the direction of the magnetic flux generated by energization is the same as that of a general motor in which all coils are wound in the forward direction.

[0091] Furthermore, in the motor 100 of this embodiment, the connection 112A is provided between the endpoints E of coils 112V1 and 112U1, between the endpoints E of coils 112W1 and 112V2, and between the endpoints E of coils 112U2 and 112W2. Therefore, the potential difference between the endpoints E of coils 112V1 and 112U1, between the endpoints E of coils 112W1 and 112V2, and between the endpoints E of coils 112U2 and 112W2 is 0 (V).

[0092] In the three coil slots 111C where the potential difference is mitigated, the windings of two adjacent coils 112 are two windings connected by a connection 112A. There are three sets of two windings connected by a connection 112A, which are the windings enclosed by the three dashed ellipses in Figure 4. Specifically, the winding Vc of coil 112V1 and the winding Uc of coil 112U1 are connected by a connection 112A. The winding Wc of coil 112W1 and the winding Vc of coil 112V2 are connected by a connection 112A. The winding Uc of coil 112U2 and the winding Wc of coil 112W2 are connected by a connection 112A.

[0093] Furthermore, in the coil slot 111C where the connection 112A is provided, the potential difference between the outer ends of adjacent coils 112 is Vo / 3(V). The outer end of the coil 112 refers to the outer end of the coil 112 in the radial direction of the back yoke portion 111A, and is the outermost part in the radial direction of the winding portion of the coil 112 wound around the teeth portion 111B.

[0094] Furthermore, in the coil slot 111C where the connection 112B is provided, the potential difference between the inner ends of adjacent coils 112 is Vo(V), and the potential difference between the outer ends in the radial direction is 2Vo / 3(V). The inner end of coil 112 refers to the inner end of coil 112 in the radial direction of the back yoke portion 111A, and is the part of coil 112 wound around the teeth portion 111B that is located furthest inward (towards the axis) in the radial direction.

[0095] In the motor 100, the potential difference between adjacent coils 112 in the coil slot 111C where the connection 112A is provided becomes small, so the insulating member 115 can be omitted in the coil slot 111C where the connection 112A is provided. The above-mentioned potential difference will be explained later.

[0096] Here, the potential difference between the outer ends of adjacent coils 112 in the coil slot 111C refers to the potential difference between the outer ends of the winding portions of two adjacent coils 112 in the coil slot 111C. In the case of coils 112V1 and 112U1, the potential difference between the outer ends of the winding portions of two coils 112 refers to the potential difference between the radial outer ends of the back yoke portion 111A of the winding portions Vc and Uc.

[0097] Of the winding portions Va, Vb, and Vc of the coil 112V1 wound around the teeth portion 111B, winding portion Vc is wound on top of winding portions Va and Vb. Similarly, of the winding portions Ua, Ub, and Uc of the coil 112U1 wound around the teeth portion 111B, winding portion Uc is wound on top of winding portions Ua and Ub. In this way, in the coil slot 111C, winding portions Vc and Uc are located on the surface of the concentrated winding structure. Furthermore, winding portions Vc and Uc extend along the radial direction of the back yoke portion 111A and have an inner end and an outer end in the radial direction of the back yoke portion 111A.

[0098] Therefore, the potential difference between the outer ends of the winding portions of two adjacent coils 112V1 and 112U1 in the coil slot 111C is the potential difference between the radial outer end of the back yoke portion 111A of the winding portion Vc of coil 112V1 and the radial outer end of the back yoke portion 111A of the winding portion Uc of coil 112U1 in the coil slot 111C.

[0099] Similarly, in the coil slot 111C, the potential difference between the inner ends of adjacent coils 112 is, for coils 112V1 and 112U1, the potential difference between the radial inner end of the back yoke portion 111A of the winding portion Vc of coil 112V1 and the radial inner end of the back yoke portion 111A of the winding portion Uc of coil 112U1 in the coil slot 111C.

[0100] This also applies to adjacent coils 112U1 and 112W1, 112W1 and 112V2, 112V2 and 112U2, 112U2 and 112W2, and 112W2 and 112V1 in the coil slot 111C.

[0101] <Potential difference between adjacent coils in a motor used for comparison> Here, we will explain the potential difference between adjacent coils using a comparison motor. Figure 7A shows an example of the configuration of the V-phase coil 12V and the U-phase coil 12U in the comparison motor. In Figure 7A, the same reference numerals are used for components that are the same as those in the stator 110 of the motor 100 in the embodiment shown in Figure 5. Figure 7A shows a cross-sectional structure corresponding to the stator 110 shown in Figures 5, 6A, and 6B, but the hatching is omitted.

[0102] Figure 7A shows a portion of the stator 110 (corresponding to the V1 and U1 phases in Figure 5). Coil 12V has the same configuration as coil 112V1 shown in Figure 5 and is wound in the forward direction around the teeth 111B. Similarly, coil 12U is wound in the forward direction around the teeth 111B. In the comparative motor, all coils are wound in the forward direction around the teeth 111B.

[0103] In such a comparison motor, the endpoint E and starting point S of adjacent coils are connected. For example, if the comparison motor has 6 slots, the endpoint E and starting point S of adjacent coils in the circumferential direction are connected for each of the 6 coils. Therefore, in Figure 7A, the endpoint E of coil 12V is connected to the starting point S of coil 12U.

[0104] Figure 7B shows an example of a delta connection of the three-phase coils of the motor used for comparison shown in Figure 7A. Figure 7B shows three coils as the three-phase coils: coil 12V, coil 12U, and coil 12W. Figure 7B also shows the first connection point 113A, the second connection point 113B, the third connection point 113C, the first lead wire 114A, the second lead wire 114B, and the third lead wire 114C.

[0105] Coil 12V has winding sections Va, Vb, and Vc. Coil 12U has winding sections Ua, Ub, and Uc. Coil 12W has winding sections Wa, Wb, and Wc. The connection relationship between coil 12V and coil 12W is the same as that of coils 112V1 and 112W1 shown in Figure 4.

[0106] In the comparison motor, coils 12V, 12U, and 12W are all wound in the forward direction, so the winding order of Ua and Uc of coil 12U is reversed compared to the winding order of coil 112U1 shown in Figure 5.

[0107] Here, consider a situation where the line voltages between the first lead line 114A, the second lead line 114B, and the third lead line 114C are Vo, the potential at the first connection point 113A is Vo (V), and the potential at the second connection point 113B is 0 (V). In this case, the potential difference between the first connection point 113A and the second connection point 113B is Vo (V).

[0108] In Figure 7B, the endpoint E of coil 12V is the point where the winding portion Vc is connected to the first connection point 113A. The starting point S of coil 12U is the point where the winding portion Ua is connected to the first connection point 113A, and the endpoint E of coil 12U is the point where the winding portion Uc is connected to the second connection point 113B.

[0109] Therefore, in coil 12V, the potential at the point between windings Vc and Vb is 2Vo / 3(V). Similarly, in coil 12U, the potential at the point between windings Ub and Uc is Vo / 3(V), and the potential at the point between windings Ua and Ub is 2Vo / 3(V). From these relationships, the potential difference between the point between windings Vc and Vb and the point between windings Ub and Uc is Vo / √3(V).

[0110] In the coil slot 111C between coil 12V and coil 12U, the point between windings Vc and Vb corresponds to the outer end of windings Vc in the radial direction of the back yoke 111A, and the point between windings Ub and Uc corresponds to the outer end of windings Uc in the radial direction of the back yoke 111A. Therefore, the potential difference between the outer end of windings Vc and the outer end of windings Uc in the radial direction of the back yoke 111A is Vo / √3(V), as shown by the double arrow in Figure 7B.

[0111] Furthermore, in the coil slot 111C between coil 12V and coil 12U, the point located at the inner end of the winding portion Uc in the radial direction of the back yoke portion 111A is half a turn closer to the starting point S of the winding portion Uc than to the endpoint E of coil 12U. The potential at this point can be treated as substantially equal to the potential at the endpoint E of coil 12U. Therefore, as shown by the double arrow in Figure 7A, in the coil slot 111C between coil 12V and coil 12U, the potential difference between the inner ends of coil 12V and coil 12U in the radial direction of the back yoke portion 111A is Vo(V).

[0112] In the comparative motor, in all coil slots 111C, the potential difference between the inner ends of adjacent coils is Vo (V), and the potential difference between the outer ends is Vo / √3 (V).

[0113] Thus, in the comparison motor, the potential difference between adjacent coils in all coil slots 111C is greater than the predetermined value mentioned above, and is a potential difference that requires an insulating member 115. Therefore, an insulating member 115 is provided in all coil slots 111C. If the comparison motor has 6 slots, then 6 insulating members 115 are required.

[0114] <Potential difference between adjacent coils in the motor 100 of the embodiment> Figure 8 shows an example of delta connection of the three-phase coils of motor 100. Figure 8 shows three of the coils 112V1 to 112W2 of motor 100: coils 112V1, 112U1, and 112W1. Figure 8 also shows the first connection point 113A, the second connection point 113B, the third connection point 113C, the first lead wire 114A, the second lead wire 114B, and the third lead wire 114C.

[0115] Here, consider a situation where the line voltages between the first lead line 114A, the second lead line 114B, and the third lead line 114C are Vo, the potential at the first connection point 113A is Vo (V), and the potential at the second connection point 113B is 0 (V). In this case, the potential difference between the first connection point 113A and the second connection point 113B is Vo (V).

[0116] In Figure 8, the endpoint E of coil 112V1 is the point where the winding portion Vc is connected to the first connection point 113A, and the endpoint E of coil 112U1 is the point where the winding portion Uc is connected to the first connection point 113A.

[0117] Therefore, in coil 112V1, the potential at the point between windings Vb and Vc is 2Vo / 3(V). Similarly, in coil 112U1, the potential at the point between windings Uc and Ub is 2Vo / 3(V). From these relationships, the potential difference between the point between windings Vb and Vc and the point between windings Uc and Ub is Vo / 3(V).

[0118] In the coil slot 111C between coils 112V1 and 112U1, the point between windings Vb and Vc corresponds to the outer end of windings Vc in the radial direction of the back yoke 111A, and the point between windings Uc and Ub corresponds to the outer end of windings Uc in the radial direction of the back yoke 111A. Therefore, in the coil slot 111C between coils 112V1 and 112U1, the potential difference between the outer end of windings Vc and the outer end of windings Uc in the radial direction of the back yoke 111A is Vo / 3(V), as shown by the double arrow in Figure 5.

[0119] Furthermore, in the coil slot 111C between coils 112V1 and 112U1, the endpoints E of coils 112V1 and 112U1 are connected by a connection 112A. The endpoint E of coil 112V1 corresponds to the inner end of the winding portion Vc in the radial direction of the back yoke portion 111A, and the endpoint E of coil 112U1 corresponds to the inner end of the winding portion Uc in the radial direction of the back yoke portion 111A. Therefore, in the coil slot 111C between coils 112V1 and 112U1, the potential difference between the inner end of the winding portion Vc and the inner end of the winding portion Uc in the radial direction of the back yoke portion 111A is 0 (V). This is because they are connected by a connection 112A.

[0120] Furthermore, in the coil slot 111C between coils 112U1 and 112W1, the inner end of the winding portion Uc of coil 112U1 in the radial direction of the back yoke portion 111A is located half a turn closer to the starting point S than the endpoint E of coil 112U1, and can be effectively treated as the endpoint E of coil 112U1. The endpoint E of coil 112U1 is the point where it is connected to the first connection point 113A. Also, in the coil slot 111C between coils 112U1 and 112W1, the outer end of the winding portion Uc in the radial direction of the back yoke portion 111A corresponds to the point between the winding portions Uc and Ub.

[0121] Furthermore, in the coil slot 111C between coils 112U1 and 112W1, the inner end of the winding portion Wc of coil 112W1 in the radial direction of the back yoke portion 111A is located half a turn closer to the starting point S than the endpoint E of coil 112W1, and can be effectively treated as the endpoint E of coil 112W1. The endpoint E of coil 112W1 is the point where it is connected to the third connection point 113C. Also, in the coil slot 111C between coils 112U1 and 112W1, the outer end of the winding portion Wc of coil 112W1 in the radial direction of the back yoke portion 111A corresponds to the point between winding portions Wb and Wc.

[0122] The voltage difference between the first connection point 113A and the third connection point 113C is Vo(V). Furthermore, the potential difference between the point between windings Uc and Ub and the point between windings Wb and Wc is 2Vo / 3.

[0123] Therefore, in the coil slot 111C between coils 112U1 and 112W1, the potential difference between the inner end of the winding portion Uc of coil 112U1 and the inner end of the winding portion Wc of coil 112W1 in the radial direction of the back yoke portion 111A is Vo(V), as shown by the double arrow in Figure 5.

[0124] Furthermore, in the coil slot 111C between coils 112U1 and 112W1, the potential difference between the outer end of the winding portion Uc of coil 112U1 and the outer end of the winding portion Wc of coil 112W1 in the radial direction of the back yoke portion 111A is 2Vo / 3(V), as shown by the double arrows in Figure 5.

[0125] In the coil slot 111C between coils 112U1 and 112W1 where connection 112B is provided, the potential difference between coils 112U1 and 112W1 is greater than a predetermined value, so an insulating member 115 is required.

[0126] Here, we have explained the potential difference between coils 112V1, 112U1, and 112W1, but the same applies to the potential difference between coils 112V1 to 112W1 shown in Figure 5.

[0127] In the coil slot 111C where the connection 112A is provided, the potential difference between the inner ends of the winding portion of the coil 112 in the radial direction of the back yoke portion 111A is 0 (V), and the voltage difference between the outer ends of the winding portion is Vo / 3 (V). In this way, the motor 100 can mitigate the potential difference between the winding portions of the coil 112 in the coil slot 111C where the connection 112A is provided. For this reason, an insulating member 115 is not required in the coil slot 111C where the connection 112A is provided.

[0128] Furthermore, in the coil slot 111C where the connection 112B is provided, the potential difference between the inner ends of the winding portion of the coil 112 in the radial direction of the back yoke portion 111A is Vo (V), and the voltage difference between the outer ends of the winding portion is 2Vo / 3 (V). For this reason, an insulating member 115 is necessary in the coil slot 111C where the connection 112B is provided.

[0129] Therefore, by using the 6-slot stator 110 shown in Figure 5, it is sufficient to alternately provide insulating members 115 in the six coil slots 111C in the circumferential direction of the stator 110, thus reducing the number of insulating members 115 by half compared to the comparative motor. This is because, in motor 100, the potential difference between the coils 112 can be mitigated compared to the comparative motor.

[0130] <Variations in the winding method of coil 112> Figure 9 shows an example of a modified winding method for the coil 112 in the stator 110 of the motor 100. Figure 9 shows the parts corresponding to coils 112V1, 112U1, and 112W1. Figure 9 shows the cross-sectional structure corresponding to the stator 110 shown in Figures 5, 6A, and 6B, but the hatching is omitted.

[0131] Figure 5 shows a configuration in which, in the radial direction of the back yoke portion 111A, the starting point S is located on the outer end side of the teeth portion 111B, and the ending point E is located on the inner end side of the teeth portion 111B.

[0132] In Figure 9, in the radial direction of the back yoke portion 111A, the starting point S is located on the inner end side of the teeth portion 111B, and the ending point E is located on the outer end side of the teeth portion 111B. Therefore, the coil 112V1 shown in Figure 9 is wound from the starting point S, located on the inner end side of the teeth portion 111B, along the surface of the teeth portion 111B, toward the radially outward direction of the back yoke portion 111A. Next, the winding portion Vb is superimposed on the winding portion Va and wound toward the radially inward direction of the back yoke portion 111A. Then, the winding portion Vc is superimposed on the winding portion Vb and wound toward the radially outward direction of the back yoke portion 111A. Therefore, the ending point E is located on the outer end side of the teeth portion 111B in the radial direction of the back yoke portion 111A. This also applies to coils 112U1 and 112W1, and to coils 112V2, 112U2, and 112W2, which are not shown in the diagram.

[0133] Furthermore, coil 112U1 is wound in the opposite direction to the teeth portion 111B relative to coils 112V1 and 112W1. Similarly, coils 112V2 and 112W2 can be wound in the opposite direction to the teeth portion 111B, and coil 112U2 can be wound in the forward direction to the teeth portion 111B.

[0134] In the stator 110 shown in Figure 9, compared to the stator 110 shown in Figure 5, the connection 112A is moved outward and the connection 112B is moved inward in the radial direction of the back yoke portion 111A.

[0135] Therefore, in the coil slot 111C where the connection 112A is provided, the position where the potential difference is 0 (V) and the position where the potential difference is Vo / 3 (V) are reversed compared to the stator 110 shown in Figure 5. In the coil slot 111C where the connection 112A is provided, similar to the stator 110 shown in Figure 5, the potential difference obtained at the inner and outer ends of the winding portions Vc and Uc in the radial direction of the back yoke portion 111A is 0 (V) and Vo / 3 (V), so the potential difference between the winding portions Vc and Uc of coils 112V1 and 112U1 is still reduced.

[0136] Similarly, in the coil slot 111C where connection 112B is provided, the position where the potential difference is Vo(V) and the position where the potential difference is 2Vo / 3(V) are reversed compared to the stator 110 shown in Figure 5.

[0137] As shown in Figure 9, in the coil slot 111C where the connection 112A is provided, the potential difference between the inner ends of the windings Vc and Uc in the radial direction of the back yoke portion 111A is Vo / 3(V). Therefore, compared to the stator 110 shown in Figure 5, the potential difference on the inside of the back yoke portion 111A in the radial direction is larger, but the insulating member 115 is not required.

[0138] Furthermore, in the coil slot 111C where the connection 112B is provided, the potential difference between the inner ends of the windings Uc and Wc in the radial direction of the back yoke portion 111A is 2Vo / 3(V), which is smaller than that of the stator 110 shown in Figure 5. Also, the potential difference between the outer ends of the windings Uc and Wc in the radial direction of the back yoke portion 111A is Vo(V), which is larger than that of the stator 110 shown in Figure 5. Thus, in the stator 110 shown in Figure 9, the potential difference distribution changes in the coil slot 111C where the connection 112B is provided compared to the stator 110 shown in Figure 5, but since the potential difference is large, the insulating member 115 is necessary.

[0139] As explained using Figure 9, even if the positions of the starting point S and ending point E in the radial direction of the back yoke portion 111A are reversed compared to the positions of the starting point S and ending point E in Figure 5, the potential difference between the winding portions of two adjacent coils 112 in the coil slot 111C where the connection 112A is provided remains mitigated.

[0140] Furthermore, as explained using Figures 5 and 9, the starting point S may be located on either the outer or inner end side of the teeth portion 111B in the radial direction of the back yoke portion 111A, and the ending point E may be located on either the inner or outer end side of the teeth portion 111B in the radial direction of the back yoke portion 111A. From this, it can be said that regardless of whether the starting point S and ending point E are located between the inner and outer ends of the teeth portion 111B in the radial direction of the back yoke portion 111A, the potential difference between the winding portions of two adjacent coils 112 can be mitigated in the coil slot 111C where the connection 112A is provided, and an insulating member 115 may not be necessary.

[0141] As described above, in the motor 100 including coils 112V1 to 112W1 connected in a delta connection, the winding direction of coil 112U1 relative to the teeth portion 111B was set to the opposite winding direction to that of coils 112V1 and 112W1. In order to prevent the direction of the magnetic flux generated by coil 112U1 from being reversed by reversing the winding direction, the connection order of winding portions Ua and Uc in the delta connection was swapped.

[0142] This configuration allows for the potential difference between coils 112V1 and 112U1 to be mitigated in the coil slot 111C between coils 112V1 and 112U1.

[0143] Therefore, it is possible to provide a motor 100 that is connected in a delta configuration and capable of mitigating the potential difference between adjacent winding sections. Furthermore, it is possible to provide a compressor 200 equipped with the motor 100 that is connected in a delta configuration and capable of mitigating the potential difference between adjacent winding sections. Furthermore, it is possible to provide an air conditioning system 1 (an example of a refrigeration system) equipped with a compressor 200 that is equipped with the motor 100 that is connected in a delta configuration and capable of mitigating the potential difference between adjacent winding sections.

[0144] Furthermore, by mitigating the potential difference between adjacent winding sections, the number of insulating members 115 can be reduced, thereby simplifying the configuration and providing a motor 100, compressor 200, and air conditioning system 1 (an example of a refrigeration system).

[0145] In a motor 100 including coils 112V1 to 112W2 connected in a delta connection, the winding direction of coils 112V2 and 112W2 relative to the teeth portion 111B was further reversed from the winding direction of coils 112V1, 112W1, and 112U2. To prevent the direction of the magnetic flux generated by coils 112V2 and 112W2 from being reversed due to the reversed winding direction of coils 112V2 and 112W2, the connection order of the winding portions Va and Vc of coil 112V2 and the connection order of the winding portions Wa and Wc of coil 112W2 were swapped in the delta connection.

[0146] With this configuration, the potential difference between coils 112V1 and 112U1, between coils 112W1 and 112V2, and between coils 112U2 and 112W2 can be mitigated in the coil slots 111C between coils 112V1 and 112U1, between coils 112W1 and 112V2, and between coils 112U2 and 112W2.

[0147] In the motor 100, which includes a 6-slot stator 110 as shown in Figure 5, the potential difference between the windings of the coils 112 in the 6 coil slots 111C can be mitigated every other slot in the circumferential direction. In the comparative motor, the potential difference between the coil windings is so large that insulating members 115 are required in all 6 coil slots 111C in the configuration using a 6-slot stator. In contrast, in motor 100, the potential difference between the windings of the coils 112 can be mitigated in 3 of the 6 coil slots 111C. As a result, the number of insulating members 115 can be reduced by half compared to the comparative motor.

[0148] Furthermore, the above description described a configuration in which the stator 110 has 6 slots as an example. That is, it described a motor 100 that includes two sets of three teeth sections 111B and three coils 112 corresponding to three phases.

[0149] However, even in configurations that include two sets of three teeth sections 111B and three coils 112 corresponding to three phases, and that include an even or odd number of sets, they are connected in a delta configuration, and the potential difference between adjacent coils 112 can be mitigated.

[0150] <8-pole, 12-slot motor 100M1> Figure 10 shows an example configuration of the 8-pole, 12-slot motor 100M1. The motor 100M1 differs from the motor 100 shown in Figure 3 in that the stator 110 has 12 slots and the rotor 120 has 8 poles. Here, we will mainly explain the 12-slot stator 110.

[0151] The 12-slot stator 110 has a configuration in which the number of teeth 111B and coils 112, which are 6 slots in the circumferential direction, is increased to 12 slots.

[0152] The stator 110 of the motor 100M1 has a stator core 111 having 12 teeth 111B and 12 coils 112V1 to 112W4. The 12 coils 112V1 to 112W4 are wound alternately in the forward and reverse directions around the teeth 111B in the circumferential direction of the stator core 111.

[0153] Specifically, the six coils 112V1, 112W1, 112U2, 112V3, 112W3, and 112U4 are wound in the forward direction around the teeth portion 111B. The other six coils 112U1, 112V2, 112W2, 112U3, 112V4, and 112W4 are wound in the reverse direction around the teeth portion 111B.

[0154] Of the 12 coil slots 111C, insulating members 115 are not provided in the 6 coil slots 111C where the potential difference between the windings of two adjacent coils 112 is mitigated. Insulating members 115 are provided in the remaining 6 coil slots 111C. Note that connections 112A and 112B are omitted in Figure 10.

[0155] In addition, it has been explained above that the stator 110 of the motor 100M1 is a stator having a stator core 111 with 12 teeth 111B and 12 coils 112V1 to 112W4.

[0156] From a different perspective, this can be seen as a configuration in which motor 100M1 includes two sets of the six teeth 111B of the six-slot motor 100 shown in Figure 3, and the six coils 112V1 to 112W2.

[0157] In this case, the teeth portions 111B of the V3 phase, U3 phase, W3 phase, V4 phase, U4 phase, and W4 phase are examples of the first, second, third, fourth, fifth, and sixth teeth portions, respectively.

[0158] Furthermore, coils 112V3, 112U3, 112W3, 112V4, 112U4, and 112W4 are examples of the first, second, third, fourth, fifth, and sixth coils, respectively.

[0159] Furthermore, winding portion Va of coil 112V3 is an example of the first winding portion, and winding portion Vc of coil 112V3 is an example of the second winding portion. Winding portion Ua of coil 112U3 is an example of the third winding portion, and winding portion Uc of coil 112U3 is an example of the fourth winding portion. Winding portion Wa of coil 112W3 is an example of the fifth winding portion, and winding portion Wc of coil 112W3 is an example of the sixth winding portion.

[0160] The winding portion Va of coil 112V4 is an example of the 7th winding portion, and the winding portion Vc of coil 112V4 is an example of the 8th winding portion. The winding portion Ua of coil 112U4 is an example of the 9th winding portion, and the winding portion Uc of coil 112U4 is an example of the 10th winding portion. The winding portion Wa of coil 112W4 is an example of the 11th winding portion, and the winding portion Wc of coil 112W4 is an example of the 12th winding portion.

[0161] Motor 100M1 includes two sets of the six teeth 111B of the six-slot motor 100 shown in Figure 3, and the six coils 112V1 to 112W2, thus including two sets each of the first to twelfth winding sections.

[0162] In this case, the first set of first teeth and the second set of sixth teeth are arranged adjacent to the back yoke 111A in the circumferential direction. Similarly, the second set of first teeth and the first set of sixth teeth are arranged adjacent to the back yoke 111A in the circumferential direction. The first winding section (Va) and the eleventh winding section (Wa) are connected to the third connection point 113C, and an insulating member 115 is placed between the second winding section (Vc) and the twelfth winding section (Wc).

[0163] Furthermore, the motor 100M1 may have a configuration that includes not only two sets of the six teeth 111B and six coils 112V1 to 112W2 of the six-slot motor 100 shown in Figure 3, but also sets of three teeth 111B for V-phase, U-phase, and W-phase, and three coils 112 for V-phase, U-phase, and W-phase. For example, in the case of a stator 110 with 15 slots, the configuration may include five sets of three teeth 111B for V-phase, U-phase, and W-phase, and three coils 112 for V-phase, U-phase, and W-phase.

[0164] Furthermore, the motor 100M1 may have a configuration that includes three or more even-numbered sets of the six teeth 111B of the six-slot motor 100 shown in Figure 3 and the six coils 112V1 to 112W2.

[0165] Furthermore, the motor 100M1 may be configured to include seven or more sets of three tooth sections 111B for the V-phase, U-phase, and W-phase, and three coils 112 for the V-phase, U-phase, and W-phase.

[0166] <6-pole, 9-slot motor 100M2> Figure 11 shows an example of the configuration of a 6-pole, 9-slot motor 100M2. Motor 100M2 differs from motor 100 shown in Figure 3 in that its stator 110 has 9 slots and its rotor 120 has 6 poles. Here, we will mainly explain the 9-slot stator 110.

[0167] The 9-slot stator 110 has a configuration in which the V3 phase, U3 phase, and W3 phase are provided between the W2 phase teeth 111B and coil 112W2 of the 6-slot stator 110 shown in Figure 3 and the V1 phase teeth 111B and coil 112V1.

[0168] In other words, in the motor 100M2, the stator 110 includes one set of first to sixth teeth and first to sixth coils, and further includes a first tooth, second tooth, third tooth and first coil, second coil, and third coil.

[0169] Furthermore, the first tooth portion (for example, the tooth portion 111B of the V1 phase) and the third tooth portion (for example, the tooth portion 111B of the W3 phase) are arranged adjacent to the back yoke portion 111A in the circumferential direction.

[0170] The stator 110 of the motor 100M2 has a stator core 111 with nine teeth 111B and nine coils 112V1 to 112W3. In the circumferential direction of the stator core 111, the nine coils 112V1 to 112W3 cannot be wound alternately in the forward and reverse directions around the teeth 111B.

[0171] Therefore, in motor 100M2, the nine coils 112V1 to 112W3 are wound alternately in the forward and reverse directions around the teeth portion 111B in the circumferential direction of the stator core 111, with one exception. In the one exception, for example, two coils 112 are wound consecutively in the forward direction around the stator core 111.

[0172] Specifically, five coils, 112V1, 112W1, 112U2, 112V3, and 112W3, are wound in the forward direction around the teeth section 111B. The remaining four coils, 112U1, 112V2, 112W2, and 112U3, are wound in the reverse direction around the teeth section 111B.

[0173] Therefore, as shown in Figure 11, the eight coils 112V1 to 112U3 are wound alternately in the forward and reverse directions around the teeth portion 111B in the circumferential direction of the stator core 111, but adjacent coils 112W3 and 112V1 are both wound in the forward direction around the teeth portion 111B.

[0174] <Delta connection of coils 112V1 to 112W3> Figure 12 shows an example of delta connection of coils 112V1 to 112W3 of motor 100M2. In addition to coils 112V1 to 112W3, Figure 12 also shows the first connection point 113A, the second connection point 113B, the third connection point 113C, the first lead wire 114A, the second lead wire 114B, and the third lead wire 114C. Note that the symbols for connections 112A and 112B are omitted in Figure 12.

[0175] The delta connection of coils 112V1 to 112W3 of motor 100M2 has the same configuration as the delta connection of coils 112V1 to 112W2 of motor 100 shown in Figure 4, but with the addition of coils 112V3 to 112W3. Therefore, coils 112V3 to 112W3 will be described here.

[0176] Coil 112V3 is composed of a conductor connecting the first connection point 113A and the third connection point 113C, and has wound sections Va, Vb, and Vc. The wound sections Va, Vb, and Vc of coil 112V3 are connected in series in the order Va, Vb, and Vc, from the third connection point 113C side toward the first connection point 113A side. Coil 112V3 is wound in the forward direction around the teeth section 111B. The parts of coil 112V3 other than the wound sections Va, Vb, and Vc are simply wires.

[0177] Coil 112U3 is composed of a conductor connecting the second connection point 113B and the first connection point 113A, and has wound sections Ua, Ub, and Uc. The wound sections Ua, Ub, and Uc of coil 112U3 are connected in series in the order Uc, Ub, and Ua, from the first connection point 113A side toward the second connection point 113B side. Coil 112U3 is wound in the reverse direction around the teeth section 111B. The parts of coil 112U3 other than the wound sections Ua, Ub, and Uc are simply wires.

[0178] Coil 112W3 is composed of a conductor connecting the third connection point 113C and the second connection point 113B, and has winding sections Wa, Wb, and Wc. The winding sections Wa, Wb, and Wc of coil 112W3 are connected in series in the order Wa, Wb, and Wc from the second connection point 113B side toward the third connection point 113C side. Coil 112W3 is wound in the forward direction around the teeth section 111B. The parts of coil 112W3 other than the winding sections Wa, Wb, and Wc are simply wires.

[0179] Therefore, the first winding (Va) of coil 112V1 and the sixth winding (Wc) of coil 112W3 are connected to the third connection point 113C.

[0180] Of the nine coil slots 111C, insulating members 115 are not provided in four of the coil slots 111C where the potential difference between the windings of two adjacent coils 112 is mitigated. In Figure 11, the connection 112A is omitted, but in these four coil slots 111C, two adjacent coils 112 are connected by the connection 112A.

[0181] Insulating members 115 are provided in the remaining five coil slots 111C. Insulating members 115 are continuously provided in the coil slots 111C between coils 112U3 and 112W3, and between coils 112W3 and 112V1, in the circumferential direction of the stator core 111. In Figure 11, the connection 112B is omitted, but in these five coil slots 111C, two adjacent coils 112 are connected by the connection 112B.

[0182] Therefore, an insulating member 115 is placed between the second winding portion (Vc) of coil 112V1 and the sixth winding portion (Wc) of coil 112W3.

[0183] In the four coil slots 111C where the potential difference is mitigated, the windings of two adjacent coils 112 are two windings connected by a connection 112A (see Figures 4 and 5). There are four sets of two windings connected by a connection 112A, which are the windings enclosed by the four dashed ellipses in Figure 12.

[0184] More specifically, the winding portion Vc of coil 112V1 and the winding portion Uc of coil 112U1 are connected by wiring 112A. The winding portion Wc of coil 112W1 and the winding portion Vc of coil 112V2 are connected by wiring 112A. The winding portion Uc of coil 112U2 and the winding portion Wc of coil 112W2 are connected by wiring 112A. The winding portion Vc of coil 112V3 and the winding portion Uc of coil 112U3 are connected by wiring 112A.

[0185] In the comparative motor described using Figures 7A and 7B, the end points E and start points S of adjacent coils in the circumferential direction of the stator core 111 are connected. Therefore, the comparative motor with 6 poles and 9 slots will contain 9 insulating members 115.

[0186] In contrast, in the motor 100M2, the potential difference between the windings of two adjacent coils 112 is reduced in four of the nine coil slots 111C, thus reducing the number of insulating members 115 by four.

[0187] Although Figure 11 shows a motor 100M2 with 6 poles and 9 slots, the stator 110 of the motor 100M2 may also have a configuration with 15 or more odd-numbered teeth 111B.

[0188] As described above, embodiments have been explained, but these embodiments are presented as examples only, and the present invention is not limited by these embodiments. The above embodiments can be implemented in various other forms, and various combinations, omissions, substitutions, and modifications are possible without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims of the invention and its equivalents. [Explanation of Symbols]

[0189] 1. Air conditioning system (an example of a refrigeration system) 100, 100M1, 100M2 motors 101 Rotation axis 110 Stator 111 Stator Core 111A Back yoke section (an example of a yoke section) 111B Teeth section 112 coils 112V1 Coil (Example of the first coil) Va winding section (an example of the first winding section) Vb winding section Vc winding section (an example of the second winding section) 112U1 Coil (Example of a second coil) Ua winding section (an example of the third winding section) Ub winding part Uc winding section (an example of the 4th winding section) 112W1 Coil (Example of the third coil) Wa winding section (an example of the 5th winding section) Wb winding section Wc winding section (an example of the 6th winding section) 112V2 Coil (Example of the 4th coil) Va winding section (an example of the 7th winding section) Vb winding section Vc winding section (an example of the 8th winding section) 112U2 Coil (An example of the 5th coil) Ua winding section (an example of the 9th winding section) Ub winding part Uc winding section (an example of the 10th winding section) 112W2 Coil (Example of the 6th coil) Wa winding section (an example of the 11th winding section) Wb winding section Wc winding section (an example of the 12th winding section) 112V3 Coil (Example of the first coil) 112U3 Coil (Example of a second coil) 112W3 Coil (Example of a third coil) 112V4 Coil (Example of the 4th coil) 112U4 Coil (An example of the 5th coil) 112W4 Coil (Example of the 6th coil) 112A, 112B wiring 113A First connection point 113B Second connection point 113C Third connection point 114A 1st leader line 114B 2nd leader line 114C 3rd leader line 115 Insulating material 120 rotors 121 Rotor Core 121A through hole 121B slot 122 Permanent Magnets 200 Compressor

Claims

1. A rotor (120) configured to rotate around the axis of the rotating shaft (101), A stator (110) having a cylindrical yoke portion (111A) arranged around the axis, a stator core (111) having first teeth portion (111B), second teeth portion (111B), and third teeth portion (111B) extending radially from the yoke portion (111A) toward the rotor (120) and arranged in the circumferential direction of the yoke portion (111A), and a first coil (112V1), second coil (112U1), and third coil (112W1) connected by delta connection, A first lead wire (114A) is connected to a first connection point (113A) to which the first coil (112V1) and the second coil (112U1) are connected, A second lead wire (114B) is connected to a second connection point (113B) to which the second coil (112U1) and the third coil (112W1) are connected, A third lead wire (114C) is connected to a third connection point (113C) to which the third coil (112W1) and the first coil (112V1) are connected, Includes, The first tooth portion (111B), the second tooth portion (111B), and the third tooth portion (111B) are arranged in this order in the circumferential direction of the yoke portion (111A). The first coil (112V1) is composed of a first conductor wound around the first teeth portion (111B), The second coil (112U1) is composed of a second conductor wound around the second teeth portion (111B) in a winding direction opposite to that of the first conductor. The third coil (112W1) is composed of a third conductor wound around the third teeth portion (111B) in the same direction as the winding direction of the first conductor. The first coil (112V1) has a first winding portion (Va) wound around the first tooth portion (111B) and a second winding portion (Vc) wound on top of the first winding portion. The second coil (112U1) has a third winding portion (Ua) wound around the second tooth portion (111B) and a fourth winding portion (Uc) wound on top of the third winding portion (Ua), The third coil (112W1) has a fifth winding portion (Wa) wound around the third tooth portion (111B) and a sixth winding portion (Wc) wound on top of the fifth winding portion (Wa), The second winding portion (Vc) and the fourth winding portion (Uc) are connected to the first connection point (113A), The third winding portion (Ua) and the fifth winding portion (Wa) are connected to the second connection point (113B), No insulating member (115) is placed between the second winding portion (Vc) and the fourth winding portion (Uc). A motor (100) is provided with an insulating member (115) between the fourth winding section (Uc) and the sixth winding section (Wc).

2. The stator core (111) has a fourth tooth portion (111B), a fifth tooth portion (111B), and a sixth tooth portion (111B) arranged in the circumferential direction of the yoke portion (111A), The stator (110) includes a fourth coil (112V2) connected to the first connection point (113A) and the third connection point (113C), a fifth coil (112U2) connected to the first connection point (113A) and the second connection point (113B), and a sixth coil (112W2) connected to the second connection point (113B) and the third connection point (113C). The first tooth portion (111B), the second tooth portion (111B), the third tooth portion (111B), the fourth tooth portion (111B), the fifth tooth portion (111B), and the sixth tooth portion (111B) are arranged in this order in the circumferential direction of the yoke portion (111A). The fourth coil (112V2) is composed of a fourth conductor wound around the fourth teeth portion (111B) in a winding direction opposite to that of the first conductor. The fifth coil (112U2) is composed of a fifth conductor wound around the fifth teeth portion (111B) in the same direction as the winding direction of the first conductor. The sixth coil (112W2) is composed of a sixth conductor wound around the sixth teeth portion (111B) in a winding direction opposite to that of the first conductor. The fourth coil (112V2) has a seventh winding portion (Va) wound around the fourth tooth portion (111B) and an eighth winding portion (Vc) wound on top of the seventh winding portion. The fifth coil (112U2) has a ninth winding portion (Ua) wound around the fifth tooth portion (111B) and a tenth winding portion (Uc) wound on top of the ninth winding portion (Ua), The sixth coil (112W2) has a 11th winding portion (Wa) wound around the sixth tooth portion (111B) and a 12th winding portion (Wc) wound on top of the 11th winding portion (Wa), The sixth winding section (Wc) and the eighth winding section (Vc) are connected to the third connection point (113C), The seventh winding portion (Va) and the ninth winding portion (Ua) are connected to the first connection point (113A), The tenth winding section (Uc) and the twelfth winding section (Wc) are connected to the second connection point (113B), No insulating member (115) is placed between the sixth winding portion (Wc) and the eighth winding portion (Vc). An insulating member (115) is placed between the eighth winding portion (Vc) and the tenth winding portion (Uc). The motor (100) according to claim 1, wherein no insulating member (115) is placed between the tenth winding portion (Uc) and the twelfth winding portion (Wc).

3. The stator (110) includes one or more sets of the first tooth portion (111B), the second tooth portion (111B), the third tooth portion (111B), the fourth tooth portion (111B), the fifth tooth portion (111B), and the sixth tooth portion (111B), and the first coil (112V1), the second coil (112U1), the third coil (112W1), the fourth coil (112V2), the fifth coil (112U2), and the sixth coil (112W2), The first tooth portion (111B) and the sixth tooth portion (111B) are arranged adjacent to the yoke portion (111A) in the circumferential direction. The first winding portion (Va) and the eleventh winding portion (Wa) are connected to the third connection point (113C), The motor (100) according to claim 2, wherein an insulating member (115) is arranged between the second winding portion (Vc) and the twelfth winding portion (Wc).

4. The stator (110) includes one or more sets of the first tooth portion (111B), the second tooth portion (111B), and the third tooth portion (111B), and the first conductor, the second conductor, and the third conductor. At least one of the first teeth (111B) and the third teeth (111B) are arranged adjacent to the circumferential direction of the yoke (111A), The first winding portion (Va) and the sixth winding portion (Wc) are connected to the third connection point (113C), A motor (100) according to any one of claims 1 to 3, wherein an insulating member (115) is arranged between the second winding portion (Vc) and the sixth winding portion (Wc).

5. A compressor (200) equipped with the motor (100) described in claim 1.

6. A refrigeration system (1) equipped with the compressor (200) described in claim 5.

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