Three-phase motor and compressor

Abstract

One aspect of the present invention relates to a three-phase motor comprising: a stator core having 3n (n being a natural number greater than 2) teeth; an insulating member having an annular outer wall portion and 3n winding portions protruding inward from the outer wall portion; 3n coils formed by winding conductors through the winding portions around the teeth; and terminals connecting three neutral wires extending from the coils of each of the three phases to each other, the insulating member having a receiving portion for receiving the terminals, each of the three neutral wires comprising an outer peripheral side conductor portion extending outward from the outer wall portion to the outer diameter side and an inner peripheral side conductor portion extending inward from the outer wall portion to the inner diameter side, one end of the inner peripheral side conductor portion being electrically connected to the terminal.

Description

Technical Field

[0001] The present invention relates to an electric motor having an insulating component integrated with the housing for terminals. Background Technology

[0002] Previously, a three-phase electric motor was known, comprising: a stator core having an annular yoke and a plurality of teeth extending radially from the yoke; an insulator mounted on the stator core; and a plurality of coils formed by winding conductors through the insulator around the teeth, with neutral wires extending from each coil connected in parallel. In the manufacturing process of a three-phase electric motor connected in parallel, the neutral wires extending from each coil need to be connected after the coils are formed.

[0003] As such a three-phase motor, there exists a motor in which the terminal housing and insulation are integrally formed. For example, in the three-phase motor described in prior art document 1, the three neutral wires (the neutral wires of each phase of the three phases) introduced into the housing are interconnected by crimp terminals inserted into the housing, thereby forming a neutral point.

[0004] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 2016-063564 Summary of the Invention

[0005] The technical problem that the invention aims to solve However, in the three-phase motor described in the aforementioned prior art document 1, the neutral wire of the V phase among the three neutral wires introduced into the housing has a portion that is close to the coil of the W phase, which is of a different phase (refer to prior art document 1). Figure 5 Furthermore, the neutral wire of phase V (+W phase) drawn from the coil is directly introduced into the housing, so the neutral wire of phase V is prone to loosening, and it may not be able to ensure the insulation distance with the coils of different phases. Therefore, partial discharge caused by potential difference may occur between the neutral wire of phase V (which is a different phase) and the coil of phase W.

[0006] In view of the above, the object of the present invention is to provide a three-phase motor and a compressor, in which the insulation between the neutral wire and the coil, which are different phases, can be adequately ensured in a three-phase motor in which the housing and the insulating parts for the terminals are integrally formed.

[0007] Technical solutions for solving technical problems One aspect of the present invention relates to a three-phase electric motor comprising: a stator core having 3n (n being a natural number of 2 or more) teeth; an insulator having an annular outer wall and 3n coil portions protruding inward from the outer wall; 3n coils formed by winding wires around the teeth through the coil portions; and terminals connecting three neutral wires extending from the coils of each of the three phases to each other. The insulating member has a receiving portion for accommodating the terminal. Each of the three neutral wires includes an outer peripheral side conductor portion extending from the outer wall portion toward the outer diameter side and an inner peripheral side conductor portion extending from the outer wall portion toward the inner diameter side, with one end of the inner peripheral side conductor portion being electrically connected to the terminal.

[0008] The aforementioned three-phase motor has an insulating member with a receiving portion for accommodating the terminals. The three neutral wires each include an outer peripheral conductor portion extending from the outer wall portion towards the outer diameter side and an inner peripheral conductor portion extending from the outer wall portion towards the inner diameter side. One end of the inner peripheral conductor portion is electrically connected to the terminal. Thus, in a three-phase motor where the terminal housing is integrally formed within the insulating member, adequate insulation between the neutral wires, which are different phases, and the coil can be ensured.

[0009] The insulating member may also have: a lead-out portion for leading the three neutral wires to the outer periphery of the insulating member respectively; and an introduction portion for introducing the neutral wires of the three phases led out to the outer periphery of the insulating member respectively to the inner periphery of the insulating member.

[0010] Alternatively, when the three adjacent teeth in the circumferential direction are arranged in the order of the circumferential direction as a first tooth, a second tooth, and a third tooth, the three neutral lines connected to the terminal are a first neutral line extending from the coil wound around the first tooth, a second neutral line extending from the coil wound around the second tooth, and a third neutral line extending from the coil wound around the third tooth, and at least one of the inlet portions allows two of the first, second, and third neutral lines to pass through.

[0011] Alternatively, when the three adjacent teeth in the circumferential direction are arranged in the order of the circumferential direction as the first tooth, the second tooth, and the third tooth, the three neutral lines connected to the terminal are a first neutral line extending from the coil wound around the first tooth, a second neutral line extending from the coil wound around the second tooth, and a third neutral line extending from the coil wound around the third tooth. When viewed from the rotation axis direction of the three-phase motor, the terminal housed in the housing is configured such that the entire terminal overlaps with the coil wound around the second tooth in a radial direction orthogonal to the rotation axis.

[0012] Alternatively, the receiving portion may have an inner diameter sidewall located radially inward relative to the terminal and orthogonal to the rotation axis of the three-phase motor, and an outer diameter sidewall located radially outward relative to the terminal and orthogonal to the rotation axis of the three-phase motor. Neutral line passing portions for the neutral line to pass through are formed on the inner diameter sidewall and the outer diameter sidewall, and the neutral line is cut off at a position radially outward relative to the outer diameter sidewall.

[0013] Alternatively, the insulating member may have an anti-detachment portion to prevent the outer peripheral conductor portion of the neutral wire from detaching from the insulating member, the anti-detachment portion being formed in the circumferential direction between the lead-out portion and the lead-in portion.

[0014] Alternatively, the inlet portion may be a slit through which the neutral wire passes, the bottom surface of which is formed at a position that does not overlap with the coil in the height direction.

[0015] Alternatively, the receiving portion may have an inner diameter sidewall located radially inward relative to the terminal and orthogonal to the rotation axis of the three-phase motor, and an outer diameter sidewall located radially outward relative to the terminal and about the rotation axis of the three-phase motor. Neutral line passage portions for the neutral line to pass through are formed on the inner diameter sidewall and the outer diameter sidewall, and the bottom surface of the gap is located at approximately the same height as the neutral line passage portions in the height direction.

[0016] One aspect of the present invention relates to a compressor comprising a three-phase electric motor, a compressor main body container, and a compression mechanism.

[0017] The compressor body housing contains the three-phase electric motor.

[0018] The compression mechanism is housed inside the compressor body container and is driven by the three-phase electric motor.

[0019] Invention Effects According to the present invention, in a three-phase motor in which the terminal housing and the insulating member are integrally formed, the insulation between the neutral line and the coil, which are different phases, can be adequately ensured. Attached Figure Description

[0020] Figure 1 This is a longitudinal sectional view of a compressor equipped with the three-phase electric motor involved in this invention.

[0021] Figure 2 This is a top view showing the stator core.

[0022] Figure 3 This is a top view showing the upper insulator and the coil.

[0023] Figure 4 It is a diagram focusing on 3 coils out of multiple coils.

[0024] Figure 5 It is a three-dimensional diagram representing an insulating component.

[0025] Figure 6 It is a cross-sectional view of a three-phase motor cut radially.

[0026] Figure 7 This is an enlarged view showing a three-phase motor involved in other embodiments. Detailed Implementation

[0027] The embodiments of the present invention will be described below with reference to the accompanying drawings.

[0028] [Compressor Structure] Figure 1 This is a longitudinal sectional view of a compressor 1 equipped with a three-phase electric motor 5 according to the present invention.

[0029] like Figure 1 As shown, the compressor 1 has a frame 2, a shaft 3, a three-phase motor 5, and a compression section 6.

[0030] A closed, roughly cylindrical internal space 7 is formed inside the frame 2. Furthermore, the frame 2 is configured such that, when placed longitudinally on a horizontal plane, the central axis of the cylinder of the internal space 7 is parallel to the vertical direction relative to the horizontal plane.

[0031] The frame 2 has a U-phase power terminal 8U, a V-phase power terminal 8V, and a W-phase power terminal 8W. The U-phase power terminal 8U, V-phase power terminal 8V, and W-phase power terminal 8W are formed of conductors. The U-phase power terminal 8U extends through the upper part of the frame 2, with one end disposed within the internal space 7 and the other end disposed within the internal space 7. Similarly, the V-phase power terminal 8V extends through the upper part of the frame 2, with one end disposed within the internal space 7 and the other end disposed within the internal space 7. Furthermore, the U-phase power terminal 8U, V-phase power terminal 8V, and W-phase power terminal 8W are mounted on the frame 2 in a manner that they are not electrically connected to each other or to the frame 2.

[0032] Furthermore, the frame 2 has an intake pipe 11 and an exhaust pipe 12. A flow path 14 is formed inside the intake pipe 11. The intake pipe 11 is connected to the frame 2 via the flow path 14 to the lower part of the internal space 7. A flow path 15 is formed inside the exhaust pipe 12. The exhaust pipe 12 is connected to the frame 2 via the flow path 15 to the upper part of the internal space 7.

[0033] Shaft 3 is formed in the shape of a rod and is positioned in the interior space 7 along the central axis of the cylinder formed in the interior space 7, i.e., the rotation axis 16. In addition, shaft 3 is rotatably supported on the frame 2 with the rotation axis 16 as the center.

[0034] The three-phase electric motor 5 has a rotor 21 that is generally cylindrical and a stator 22 that is generally cylindrical. The rotor 21 is fixed to the shaft 3 and rotatably supported on the frame 2 about the rotation shaft 16. In addition, the rotor 21 has a plurality of permanent magnets (not shown) embedded and fixed inside the rotor 21.

[0035] The compression unit 6 is, for example, a rotary compression mechanism that compresses the refrigerant supplied via the suction pipe 11 by rotating the shaft 3. Furthermore, the compression unit 6 supplies the compressed refrigerant to the space between the three-phase motor 5 and the compression unit 6 in the internal space 7.

[0036] The stator 22 is arranged to surround the outer periphery of the rotor 21 and is fixed to the frame 2. The stator 22 also includes a stator core 23, an upper insulator 24, a lower insulator 25, and multiple windings 26. The upper insulator 24 is fixed to the upper part of the stator core 23. The lower insulator 25 is fixed to the lower part of the stator core 23. Furthermore, the upper insulator 24 and the lower insulator 25 are formed of resin, insulating the stator core 23 from the windings 26 (conductors).

[0037] Figure 2This is a top view showing the stator core 23. The stator core 23 is formed into a cylindrical shape by stacking multiple plates made of a soft magnetic material, exemplified by silicon steel sheets. Furthermore, the stator core 23 has nine teeth.

[0038] like Figure 2 As shown, the stator core 23 has a yoke 31 and a plurality of teeth 32-1, 32-2, 32-3, 32-4, 32-5, 32-6, 32-7, 32-8, and 32-9. The yoke 31 is formed in a generally cylindrical shape and is arranged such that the central axis of the yoke 31 overlaps with the rotation axis 16 of the rotor 21. The plurality of teeth 32-1 to 32-9 are formed such that one end protrudes from the inner circumferential surface 33 of the yoke 31 toward the rotation axis 16 (towards the radially inward side). In this embodiment, nine of the plurality of teeth 32-1 to 32-9 are arranged at equal intervals along the circumferential direction on the inner circumferential surface 33 of the yoke 31.

[0039] Furthermore, radial direction refers to the direction of the diameter of a circle orthogonal to the rotation axis 16 with the rotation axis 16 as its center. Additionally, circumferential direction refers to the circumferential direction of an imaginary circle centered on the rotation axis 16.

[0040] Figure 3 This is a top view showing the upper insulator 24 and the coil 50. Figure 4 This diagram focuses on three coils out of a total of 50 coils. Figure 5 This is a perspective view showing the insulating element 24. Figure 6 This is a cross-sectional view of a three-phase motor 5 cut radially.

[0041] like Figure 3 As shown, the upper insulating member 24 has an outer wall portion 41, a plurality of roll portions 42-1, 42-2, 42-3, 42-4, 42-5, 42-6, 42-7, 42-8, 42-9, and a plurality of flange portions 43-1, 43-2, 43-3, 43-4, 43-5, 43-6, 43-7, 43-8, 43-9. The outer wall portion 41 is formed in a generally cylindrical shape. The outer wall portion 41 has an inner peripheral surface 44 facing radially inward (towards the rotation axis 16) and an outer peripheral surface 45 facing radially outward (towards the side opposite to the rotation axis 16). In addition, the outer wall portion 41 also has a receiving portion 46, which will be described later.

[0042] Multiple roll portions 42-1 to 42-9 are integrally formed on the outer wall portion 41, protruding from the inner circumferential surface 44 toward the rotation axis 16, and are arranged at equal intervals along the circumferential direction on the inner circumferential surface 44. Multiple flange portions 43-1 to 43-9 correspond to the multiple roll portions 42-1 to 42-9 and are each formed into a generally semi-circular plate shape. In addition, the ends of the multiple flange portions 43-1 to 43-9 on the inner diameter side (the ends that are different from the ends connected to the inner circumferential surface 44 of the outer wall portion 41) are continuously formed on the multiple copper roll portions 42-1 to 42-9.

[0043] Furthermore, multiple winding sections 42-1 to 42-9 correspond to multiple teeth 32-1 to 32-9 of the stator core 23. Additionally, in each winding section 42, a winding 26 (conductor) is wound around a tooth 32, bypassing the winding section 42, thereby forming nine coils 50-1 to 50-9. In this embodiment, the coils 50-1 to 50-9 are arranged in a manner that repeats the U-phase, V-phase, and W-phase sequence in the circumferential direction.

[0044] Furthermore, the number of teeth 32, coil 42 and coil 50 is not limited to 9; the present invention can be applied as long as there are 3n (n is a natural number of 2 or more).

[0045] The receiving portion 46 receives the terminal 60. In this embodiment, the receiving portion 46 and the insulating member 24 are integrally formed in a portion that is divided into three equal parts in the circumferential direction on the outer peripheral surface 45.

[0046] Here, the three adjacent teeth in the circumferential direction are designated as the first tooth, the second tooth, and the third tooth in the order arranged in the circumferential direction. The three neutral lines 52 connected to the terminal 60 are defined as the first neutral line 52-1 extending from the coil wound around the first tooth, the second neutral line 52-2 extending from the coil wound around the second tooth, and the third neutral line 52-3 extending from the coil wound around the third tooth.

[0047] Additionally, for example, in Figure 3 In this configuration, three adjacent teeth in the circumferential direction are tooth 32-9, tooth 32-1, and tooth 32-2. Similarly, three adjacent teeth in the circumferential direction can also be combinations of tooth 32-3, tooth 32-4, and tooth 32-5, or combinations of tooth 32-6, tooth 32-7, and tooth 32-8. In this case, tooth 32-9, tooth 32-3, and tooth 32-6 correspond to the first tooth. Tooth 32-1, tooth 32-4, and tooth 32-7 correspond to the second tooth. Tooth 32-2, tooth 32-5, and tooth 32-8 correspond to the third tooth. Similarly, in... Figure 3In the diagram, the coils wound on the first tooth correspond to coils 50-9, 50-3, and 50-6. The coils wound on the second tooth correspond to coils 50-1, 50-4, and 50-7. The coils wound on the third tooth correspond to coils 50-2, 50-5, and 50-8.

[0048] Additionally, for example, in Figure 4 In the diagram, the three adjacent tooth sections in the circumferential direction are tooth section 32-3, tooth section 32-4, and tooth section 32-5. Furthermore, tooth section 32-3 corresponds to the first tooth section, tooth section 32-4 corresponds to the second tooth section, and tooth section 32-5 corresponds to the third tooth section. Similarly, in... Figure 4 In the diagram, the coil wound on the first tooth corresponds to coil 50-3. The coil wound on the second tooth corresponds to coil 50-4. The coil wound on the third tooth corresponds to coil 50-5.

[0049] In this definition, viewed from the direction of the rotation axis 16 of the three-phase motor 5 (top view), the terminal 60 housed in the housing portion 46 is arranged such that the entire terminal 60 overlaps with the coil 50 wound around the second tooth in a radial direction orthogonal to the rotation axis 16. For example, as Figure 3 As shown, terminal 60 is configured such that, when viewed from the direction of rotation axis 16 (dashed line 17 is assumed to be the line of sight viewed from the rotation axis 16), it radially overlaps with coil 50-4 wound around tooth 32-4, which serves as the second tooth. That is, when viewed from the direction of rotation axis 16, it is configured such that the two ends of the circumferential direction of terminal 60 are respectively connected to the rotation axis 16 at an angle. θ 1. The angle at which the two ends of the coil 50-4 are connected to the rotation axis 16 in the circumferential direction. θ 2. Small, and the entire terminal 60 is at an angle in the circumferential direction. θ Within the range of 2.

[0050] In addition, for ease of understanding, the first neutral line 52-1, the second neutral line 52-2, and the third neutral line 52-3 shown in the figure schematically illustrate the path (trajectory) of the line.

[0051] Three neutral wires 52 extending from the coils 50 of each of the three phases are connected to terminals 60 housed in receiving portions 46 formed on the outer peripheral surface 45. Furthermore, each of the three neutral wires 52 includes an outer peripheral side conductor 56 extending from the outer wall portion 41 towards the outer diameter side and an inner peripheral side conductor 57 extending from the outer wall portion 41 towards the inner diameter side, with one end of the inner peripheral side conductor 57 electrically connected to the terminal 60.

[0052] In this embodiment, such as Figure 4As shown, the upper insulating member 24 has: a lead-out portion 70 for leading out the three-phase neutral wires 52 to the outer periphery of the insulating member 24 respectively; and an introduction portion 80 for introducing the three-phase neutral wires 52 led out from the lead-out portion 70 to the outer periphery to the inner periphery of the insulating member 24 respectively.

[0053] That is, the outer peripheral conductor portion 56 refers to the portion of the neutral wire 52 that extends from the lead-out portion 70 to the outer peripheral side and is introduced into the inner peripheral side through the lead-in portion 80. Similarly, the inner peripheral conductor portion 57 refers to the portion of the neutral wire 52 that extends from the lead-in portion 80 to the inner peripheral side and is connected to the terminal 60 of the receiving portion 46.

[0054] Furthermore, in this embodiment, at least one inlet 80 allows two neutral lines 52 from the first neutral line 52-1, the second neutral line 52-2, and the third neutral line 52-3 to pass through. That is, in this embodiment, two inlet 80s are formed on each side of each receiving portion 46, for a total of six. In addition, one outlet 70 is formed for each of the nine coils 50-1 to 50-9 to lead out the neutral lines 52, for a total of nine.

[0055] For example, such as Figure 3 As shown, the second neutral line 52-2 extending from coil 50-1 and the third neutral line 52-3 extending from coil 50-2 pass through the introduction portion 80. Additionally, the second neutral line 52-2 extending from coil 50-4 and the third neutral line 52-3 extending from coil 50-5 pass through the introduction portion 80-4. Furthermore, the second neutral line extending from coil 50-7 and the third neutral line 52-3 extending from coil 50-8 pass through the introduction portion 80-6.

[0056] Furthermore, the lead-in section 80 can also be formed independently by the three phases U, V, and W. That is, the lead-in section 80 can also be formed in the same number as the lead-out section 70 that leads out the neutral line 52.

[0057] In this embodiment, the insulating member 24 is provided with an anti-detachment portion 90 to prevent the outer peripheral conductor portion 56 of the neutral wire 52 from detaching from the insulating member 24. The anti-detachment portion 90 is formed as a protrusion 75 protruding radially outward from the outer peripheral surface of the insulating member 24. The anti-detachment portion 90 restricts the movement of the outer peripheral conductor portion 56 of the neutral wire 52 in the up-down direction (rotation axis 16 direction). In addition, the anti-detachment portion 90 is formed circumferentially between the lead-out portion 70 and the lead-in portion 80. For example, in Figure 4 In the middle, the first neutral line 52-1, which is led out from the lead-out part 70-3, is stuck in the anti-detachment part 90a while passing through the lead-in part 80-3. Similarly, the second neutral line 52, which is led out from the lead-out part 70-4, is stuck in the anti-detachment part 90b while passing through the lead-in part 80-4.

[0058] In addition, in this embodiment, such as Figure 4 As shown, the third neutral line 52-3, which is led out from the lead-out portion 70-5, passes through the lead-in portion 80-4 while being restricted from moving in the up and down direction by the anti-detachment portions 90b, 90c, and 90d. Furthermore, the number and position of the anti-detachment portions 90 are not limited. As long as the outer peripheral conductor portion 56 of the neutral line 52 can be prevented from detaching, the anti-detachment portions 90 can be formed at any position between the lead-out portion 70 and the lead-in portion 80.

[0059] like Figure 4 as well as Figure 6 As shown, the receiving portion 46 has an inner diameter sidewall 54 facing the radially inward side of the three-phase motor 5 and an outer diameter sidewall 55 facing the radially outward side of the three-phase motor 5. Furthermore, neutral line passage portions (slits) 47 for the neutral line 52 to pass through are formed on both the inner diameter sidewall 54 and the outer diameter sidewall 55. On the outer diameter sidewall 55, a protrusion 75 protruding radially outward from the outer diameter sidewall 55 is formed near the lower end of the slit 47. Additionally, the neutral line 52 is cut off at a position radially outward from the outer diameter sidewall 55, supported by the protrusion 75.

[0060] Additionally, the inlet portion 80 is a slit through which the neutral wire 52 passes. The bottom surface of the slit in the inlet portion 80 is formed at a position that does not overlap with the coil 50 in the height direction.

[0061] As described above, according to this embodiment, the three-phase motor 5 includes: a stator core 23 having 3n (n is a natural number of 2 or more) teeth 32; an insulating member 24 having an annular outer wall portion 41 and 3n winding portions 42 protruding inward from the outer wall portion 41; 3n coils 50 formed by winding wires through the winding portions 42 and onto the teeth 32; and a terminal 60 connecting three neutral wires 52 (52-1, 52-2, 52-3) extending from the coils 50 of each of the three phases to each other. In this three-phase motor 5, the insulating member 24 has a receiving portion 46 for receiving the terminal 60. The three neutral wires 52 each include an outer peripheral side conductor portion 56 extending from the outer wall portion 41 to the outer diameter side and an inner peripheral side conductor portion 57 extending from the outer wall portion 41 to the inner diameter side. One end of the inner peripheral side conductor portion is electrically connected to the terminal 60. Thus, each of the three-phase neutral wires 52 is simultaneously led out to the outer periphery of the insulating member 24, then introduced to the inner periphery, and finally introduced into the receiving portion 46 from the center side. Therefore, it is possible to prevent the neutral wires 52 of each phase from approaching the coils 50 of different phases. Thus, it is possible to properly ensure the insulation between the neutral wires 52 and the coils 50, which are of different phases.

[0062] Furthermore, when the neutral wire 52 is directly introduced into the housing 46 (housing) after the coil is formed using an automatic winding machine, since the neutral wire 52 is not temporarily fixed, it will loosen once the hand is released. If the terminal is inserted into the housing 46 in a loose state, the neutral wire 52 will be loose and close to the coil 50 of the opposite phase, which may make it impossible to maintain insulation.

[0063] In contrast, in this invention, after the coil 50 is wound around the toothed portion 32, the neutral wire 52 is not directly introduced into the receiving portion 46. Instead, all three phases of the neutral wire 52 are led out to the outer periphery of the insulating member 24 at once. This allows the neutral wire 52 to be led out under tension while being led out to the outer periphery of the insulating member 24, thus minimizing the length of the conductor from the coil 50 to the lead-out portion 70 of the insulating member 24 and preventing slack. Furthermore, after being led out to the outer periphery of the insulating member 24, the neutral wire 52 is again introduced to the inner periphery of the insulating member 24. Thus, as it passes through the lead-out portion 70 and the lead-in portion 80, the creased neutral wire 52 rubs against the lead-out portion 70 and the lead-in portion 80 of the insulating member 24, temporarily fixing it to the insulating member 24 and maintaining tension on the neutral wire 52. Therefore, before inserting the terminal 60 into the receiving portion 46 while the neutral wire 52 is being introduced from the inner periphery of the insulating member 24 into the receiving portion 47, it is possible to prevent the neutral wire 52 from loosening.

[0064] Furthermore, according to this embodiment, the insulating member 24 has: a lead-out portion 70 for leading out the three neutral wires 52 to the outer periphery of the insulating member 24 respectively; and an introduction portion 80 for introducing the three-phase neutral wires 52 led out from the lead-out portion 70 to the outer periphery to the inner periphery of the insulating member 24 respectively. Thus, it is possible to appropriately form an outer periphery lead-out portion for preventing the neutral wires 52 from approaching out-of-phase coils.

[0065] Furthermore, according to this embodiment, when three adjacent teeth 32 in the circumferential direction are arranged in the circumferential direction as a first tooth (tooth 32-3), a second tooth (tooth 32-4), and a third tooth (tooth 32-5), the three neutral wires 52 connected to the terminal 60 are a first neutral wire 52-1 extending from the coil 50 (coil 50-3) wound around the first tooth, a second neutral wire 52-2 extending from the coil 50 (coil 50-) wound around the second tooth, and a third neutral wire 52-3 extending from the coil 50 (coil 50-5) wound around the third tooth, and two of the neutral wires 52 among the first neutral wire 52-1, the second neutral wire 52-2, and the third neutral wire 52-3 pass through at least one inlet portion 80. Therefore, although the three neutral lines 52-1 to 52-3 are out of phase, they are all connected to the same neutral point. Thus, even if the neutral lines 52 are close to each other, the electromagnetic influence between them is small. Taking advantage of this, by passing the neutral lines 52 of multiple phases through at least one lead-in portion 80, the lead-in portion 80 can be brought close to the receiving portion 46 in the circumferential direction, and the insulation distance between the out-of-phase neutral lines 52 and the coil 50 can be properly ensured.

[0066] Furthermore, according to this embodiment, when the three adjacent teeth 32 in the circumferential direction are arranged in the circumferential direction as the first tooth (tooth 32-3), the second tooth (tooth 32-4), and the third tooth (tooth 32-5), the three neutral lines 52 connected to the terminal 60 are the first neutral line 52-1 extending from the coil 50 (coil 50-3) wound on the first tooth, the second neutral line 52-2 extending from the coil 50 (coil 50-4) wound on the second tooth, and the third neutral line 52-3 extending from the coil 50 (coil 50-5) wound on the third tooth. When viewed from the direction of the rotation axis 16 of the three-phase motor 5, the terminal 60 housed in the housing portion 46 is configured such that the entire terminal 60 overlaps with the coil 50 (coil 50-4) wound on the second tooth (tooth 32-4) in a radial direction orthogonal to the rotation axis 16. Therefore, the lead-out portion 70 for preventing the neutral wire 52 from approaching the coil 50 of the opposite phase can be appropriately formed. Furthermore, it is less likely to misjudge the combination of the three neutral wires 52 introduced into the receiving portion 46. Conversely, if the terminal 60 does not overlap with the coil 50 of the second tooth in the circumferential direction, the neutral wire 52 of one of the three phases cannot form the outer peripheral conductor portion 56; that is, the neutral wire cannot be led out to the outer peripheral side of the insulating member 24.

[0067] Furthermore, according to this embodiment, the receiving portion 46 has an inner diameter sidewall 54 located radially inward relative to the terminal 60 and orthogonal to the rotation axis 16 of the three-phase motor 5, and an outer diameter sidewall 55 located radially outward relative to the terminal 60 and orthogonal to the rotation axis 16 of the three-phase motor 5. A slit 47, serving as a neutral wire passage portion, is formed in both the inner diameter sidewall 54 and the outer diameter sidewall 55. The neutral wire 52 is cut off radially outward relative to the outer diameter sidewall 55 while supported by the protrusion 75. Thus, the connecting wire 51, which passes through the housing, is led out radially outward and cut off radially outward relative to the insulating member 24. To prevent poor riveting, the neutral wire 52 is cut using a cutting edge while it is positioned within the protrusion 75, which serves as a receiving portion, thus improving manufacturing reliability.

[0068] Furthermore, according to this embodiment, the insulating member 24 is provided with an anti-detachment portion 90 to prevent the outer peripheral conductor portion 53 of the neutral wire 52 from detaching from the insulating member 24. The anti-detachment portion 90 is formed in the circumferential direction between the lead-out portion 70 and the lead-in portion 80. Thus, the anti-detachment portion 90 can prevent the outer peripheral conductor portion 56 of the neutral wire 52 from detaching from the insulating member 24 and thus maintaining the insulation distance.

[0069] Furthermore, according to this embodiment, the introduction portion 80 is a slit through which the neutral wire 52 passes, and the bottom surface of the slit is formed at a position that does not overlap with the coil 50 in the height direction. As a result, when a connecting wire 51 that is different from the coil 50, which has a housing portion 46 (shell), is introduced into the housing portion 46, it is possible to prevent the out-of-phase connecting wire 51 from approaching the coil 50 and to ensure sufficient insulation distance.

[0070] Furthermore, according to this embodiment, the housing 46 has an inner diameter sidewall 54 located radially inward relative to the terminal 60 and orthogonal to the rotation axis 16 of the three-phase motor 5, and an outer diameter sidewall 55 located radially outward relative to the terminal 60 and orthogonal to the rotation axis 16 of the three-phase motor 5. A slit 47, serving as a neutral wire passage, is formed in both the inner diameter sidewall 54 and the outer diameter sidewall 55. The bottom surface of the slit forming the lead-out portion 70 is at approximately the same height as the slit 47 serving as the neutral wire passage. Therefore, when a neutral wire 52 of a different phase than the coil 50 to which the housing 46 (housing) is formed is introduced into the housing 46, the non-phase neutral wire 52 can be prevented from approaching the coil 50, ensuring sufficient insulation distance.

[0071] Furthermore, according to this embodiment, the compressor 1 includes a three-phase motor 5, a frame 2 that houses the three-phase motor 5, and a compression section 6 that is housed inside the frame 2 and driven by the three-phase motor 5. Thus, a compressor 1 with improved reliability can be obtained by ensuring the insulation of the three-phase motor 5.

[0072] Figure 7 This is an enlarged view showing a three-phase motor 5 according to another embodiment. In this embodiment, the characteristic is that the height of the bottom surface of the gap serving as the inlet portion 80 (the height from the lower end of the insulating member 24) is approximately the same as the height of the bottom surface of the neutral wire passage portion 47 (the height from the lower end of the insulating member 24) (see reference). Figure 7 (H1 and H2), in addition to Figure 5 The three-phase motor 5 involved in the embodiment is the same. That is, the bottom surface of the inlet portion 80 (slit) and the bottom surface of the neutral wire passage portion 47 are at approximately the same height in the height direction. Therefore, when the direction orthogonal to the rotation axis 16 is set to the horizontal direction, the inner peripheral side conductor portion 57 can be installed parallel to the horizontal direction from the inlet portion 80 to the neutral wire passage portion 47. Thus, the insulation between the non-phase neutral wire 52 and the coil 50 can be properly ensured, and the slack of the neutral wire 52 can be further suppressed.

[0073] Explanation of reference numerals in the attached figures 1: Compressor 5: Three-phase electric motor 16: Rotation axis 23: Stator core 24: Upper insulating component 26: Multiple windings 32: Teeth 42: Roll section 46: Containment Department 47: Neutral line passage (gap) 50: Coil 54: Inner diameter sidewall 55: Outer diameter sidewall 56: Peripheral conductor section 57: Inner peripheral guide section 60: Terminal 70: Outlet (gap) 75: Protrusion 80: Introduction section (gap) 90: Anti-shedding section.

Claims

1. A three-phase electric motor, comprising: The stator core has 3n teeth, where n is a natural number greater than or equal to 2; an insulator has an annular outer wall and 3n coils protruding inward from the outer wall; 3n coils are formed by winding conductors around the teeth through the coils; and terminals connect three neutral wires extending from the coils of each of the three phases to each other. The insulating member has a receiving portion for accommodating the terminal. Each of the three neutral wires includes an outer peripheral side conductor portion extending from the outer wall portion toward the outer diameter side and an inner peripheral side conductor portion extending from the outer wall portion toward the inner diameter side, with one end of the inner peripheral side conductor portion being electrically connected to the terminal.

2. The three-phase motor according to claim 1, wherein, The insulating member has: a lead-out portion for leading the three neutral wires to the outer periphery of the insulating member respectively; and an inlet portion for introducing the three neutral wires led out to the outer periphery of the insulating member respectively into the inner periphery of the insulating member.

3. The three-phase motor according to claim 2, wherein, When three adjacent teeth in the circumferential direction are designated as the first tooth, the second tooth, and the third tooth in the order arranged in the circumferential direction, The three neutral wires connected to the terminal are a first neutral wire extending from the coil wound on the first tooth, a second neutral wire extending from the coil wound on the second tooth, and a third neutral wire extending from the coil wound on the third tooth. At least one of the introduced portions allows two of the neutral lines, namely the first neutral line, the second neutral line, and the third neutral line, to pass through.

4. The three-phase motor according to claim 1, wherein, When three adjacent teeth in the circumferential direction are designated as the first tooth, the second tooth, and the third tooth in the order arranged in the circumferential direction, The three neutral wires connected to the terminal are a first neutral wire extending from the coil wound on the first tooth, a second neutral wire extending from the coil wound on the second tooth, and a third neutral wire extending from the coil wound on the third tooth. When viewed from the direction of rotation of the three-phase motor, the terminal housed in the housing is configured such that the entire terminal overlaps with the coil wound around the second tooth in a radial direction orthogonal to the rotation axis.

5. The three-phase motor according to claim 1, wherein, The receiving portion has an inner diameter sidewall located radially inward relative to the terminal and orthogonal to the rotation axis of the three-phase motor, and an outer diameter sidewall located radially outward relative to the terminal and orthogonal to the rotation axis of the three-phase motor. Neutral line passage portions for the neutral line to pass through are formed on both the inner and outer diameter sidewalls. The neutral line is cut off at a position radially outward from the outer diameter sidewall.

6. The three-phase motor according to claim 2, wherein, The insulating member has an anti-detachment portion that prevents the outer peripheral conductor portion of the neutral wire from detaching from the insulating member. The anti-detachment portion is formed in the circumferential direction between the lead-out portion and the lead-in portion.

7. The three-phase motor according to claim 2, wherein, The inlet is a slit through which the neutral line passes. The bottom surface of the gap is formed at a position that does not overlap with the coil in the height direction.

8. The three-phase electric motor according to claim 7, wherein, The receiving portion has an inner diameter sidewall located radially inward relative to the terminal and orthogonal to the rotation axis of the three-phase motor, and an outer diameter sidewall located radially outward relative to the terminal and about the rotation axis of the three-phase motor. Neutral line passage portions for the neutral line to pass through are formed on both the inner and outer diameter sidewalls. The bottom surface of the gap and the bottom surface of the neutral line passage are at approximately the same height in the height direction.

9. A compressor, comprising: The three-phase electric motor according to any one of claims 1 to 8; The compressor main body container, which houses the three-phase electric motor; and The compression mechanism is housed inside the compressor body container and is driven by the three-phase electric motor.

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