3-phase motor and compressor

Abstract

A three-phase motor and compressor are provided that can properly ensure insulation between a neutral wire and a coil, which are of different phases, in a three-phase motor in which a terminal housing is integrally formed with an insulator. [Solution] A three-phase motor according to one embodiment of the present invention is a three-phase motor having a stator core with 3n (n is a natural number greater than or equal to 2) tooth portions, an insulator having an annular outer wall portion and 3n winding bodies protruding inward from the outer wall portion, 3n coils formed by winding conductors around the teeth portions via the winding body portion, and terminals connecting three neutral wires extending from each of the coils for each of the three phases, wherein the insulator has an accommodating portion for accommodating the terminals, and each of the three neutral wires includes an outer conductor portion drawn out from the outer wall portion to the outer diameter side and an inner conductor portion drawn in from the outer wall portion to the inner diameter side, and one end of the inner conductor portion is electrically connected to the terminal.

Description

[Technical Field]

[0001] The present invention relates to a motor having an insulator integrated with a housing for terminals. [Background technology]

[0002] A three-phase motor has been known that includes a stator core having an annular yoke and a plurality of teeth extending radially from the yoke, an insulator attached to the stator core, and a plurality of coils formed by winding conductors around the teeth via the insulator, with the neutral wires extending from each coil connected in parallel.In the manufacturing process of a three-phase motor connected in parallel, it is necessary to connect the neutral wires extending from each coil after the coils are formed.

[0003] Some of these three-phase motors have a terminal housing integrally formed with an insulator. For example, in the three-phase motor described in Prior Art Document 1, three neutral wires (one for each of the three phases) are drawn into the housing and are connected to each other by crimp terminals inserted into the housing, forming a neutral point. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-063564 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the three-phase motor described in the above-mentioned Prior Art Document 1, the V-phase neutral wire, of the three neutral wires drawn into the housing, is close to the W-phase coil, which is a different phase (see Figure 5 in Prior Art Document 1). Furthermore, because the V-phase (+W-phase) neutral wire drawn from the coil is drawn directly into the housing, the V-phase neutral wire is prone to loosening, which may make it difficult to ensure the insulation distance between it and the W-phase coil. This poses a problem of the potential difference potentially causing partial discharge between the V-phase neutral wire and the W-phase coil, which are different phases.

[0006] In view of the above circumstances, an object of the present invention is to provide a three-phase motor and compressor in which a terminal housing is integrally formed with an insulator, and which can properly ensure insulation between the neutral wire and the coil, which are of different phases. [Means for solving the problem]

[0007] A three-phase motor according to one embodiment of the present invention includes a stator core having 3n (n is a natural number of 2 or more) teeth, an insulator having an annular outer wall and 3n winding drums protruding inward from the outer wall, 3n coils formed by winding conducting wires around the teeth via the winding drums, and terminals connecting three neutral wires extending from each of the coils for three phases, The insulator has a receiving portion formed therein for receiving the terminal, Each of the three neutral wires includes an outer conductor portion pulled out from the outer wall portion to the outer diameter side and an inner conductor portion pulled out from the outer wall portion to the inner diameter side, and one end of the inner conductor portion is electrically connected to the terminal.

[0008] The three-phase motor has an insulator in which a housing for accommodating the terminal is formed, and each of the three neutral wires includes an outer conductor portion drawn from the outer wall portion to the outer diameter side and an inner conductor portion drawn from the outer wall portion to the inner diameter side, one end of the inner conductor portion being electrically connected to the terminal. This makes it possible to appropriately ensure insulation between the neutral wires and the coils of different phases in a three-phase motor in which a terminal housing is integrally formed with the insulator.

[0009] The insulator may have a pull-out portion for pulling each of the three neutral wires out to the outer periphery of the insulator, and a pull-in portion for pulling each of the three-phase neutral wires pulled out to the outer periphery by the pull-out portion into the inner periphery of the insulator.

[0010] When the three circumferentially adjacent tooth portions are designated as the first tooth portion, the second tooth portion, and the third tooth portion 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 around the first tooth portion, a second neutral wire extending from the coil wound around the second tooth portion, and a third neutral wire extending from the coil wound around the third tooth portion, and at least one of the inlet portions may be passed through by two of the first neutral wire, the second neutral wire, and the third neutral wire.

[0011] When the three circumferentially adjacent tooth portions are designated as the first tooth portion, the second tooth portion, and the third tooth portion in the order in which they are arranged in the circumferential direction, the three neutral wires connected to the terminals are a first neutral wire extending from the coil wound around the first tooth portion, a second neutral wire extending from the coil wound around the second tooth portion, and a third neutral wire extending from the coil wound around the third tooth portion, and when viewed from the direction of the rotational axis of the three-phase motor, the terminals accommodated in the accommodating portion may be arranged so that the entire terminal overlaps with the coil wound around the second tooth portion in a radial direction perpendicular to the rotational axis.

[0012] The accommodating portion has an inner diameter sidewall located radially inward relative to the terminal, perpendicular to the rotation axis of the three-phase motor, and an outer diameter sidewall located radially outward relative to the terminal, perpendicular to the rotation axis of the three-phase motor, and a neutral conductor passage portion through which the neutral conductor passes is formed in each of the inner diameter sidewall and the outer diameter sidewall, and the neutral conductor may be cut at a position radially outward of the outer diameter sidewall.

[0013] The insulator may be formed with a fall prevention portion that prevents the outer conductor portion of the neutral wire from falling off the insulator, and the fall prevention portion may be formed between the pull-out portion and the pull-in portion in the circumferential direction.

[0014] The lead-in portion may be a slit through which the neutral conductor passes, and the bottom surface of the slit may be formed so as not to overlap the coil in the height direction.

[0015] The accommodating portion has an inner diameter sidewall located radially inward relative to the terminal, perpendicular to the rotation axis of the three-phase motor, and an outer diameter sidewall located radially outward relative to the terminal around the rotation axis of the three-phase motor, and a neutral conductor passing portion through which the neutral conductor passes is formed in each of the inner diameter sidewall and the outer diameter sidewall, and the bottom surface of the slit may be located at approximately the same height in the height direction as the neutral conductor passing portion.

[0016] A compressor according to one embodiment of the present invention includes a three-phase motor, a compressor main body container, and a compression mechanism. The compressor main body container accommodates the three-phase motor therein. The compression mechanism is housed inside a compressor main body container and is driven by the three-phase motor. [Effects of the Invention]

[0017] According to the present invention, in a three-phase motor in which a terminal housing is integrally formed with an insulator, it is possible to appropriately ensure insulation between the neutral wire and the coils of different phases. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a longitudinal sectional view showing a compressor provided with a three-phase motor according to the present invention. [Figure 2] FIG. 2 is a top view showing a stator core. [Figure 3] FIG. [Figure 4] This is a diagram focusing on three coils out of multiple coils. [Figure 5] FIG. [Figure 6] FIG. 2 is a cross-sectional view of a three-phase motor taken along a radial direction. [Figure 7] FIG. 10 is an enlarged view showing a three-phase motor according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0020] [Compressor configuration] FIG. 1 is a vertical cross-sectional view showing a compressor 1 provided with a three-phase motor 5 according to the present invention.

[0021] As shown in FIG. 1, the compressor 1 includes a housing 2, a shaft 3, a three-phase motor 5, and a compression unit 6.

[0022] A sealed, substantially cylindrical internal space 7 is formed inside the housing 2. The housing 2 is formed so that when placed upright on a horizontal surface, the central axis of the cylinder of the internal space 7 is parallel to the horizontal surface in the vertical direction.

[0023] The housing 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, the V-phase power terminal 8V, and the W-phase power terminal 8W are formed of conductors. The U-phase power terminal 8U penetrates the top of the housing 2 so that one end is located in the internal space 7 and the other end is located in the internal space 7. Similarly, the V-phase power terminal 8V penetrates the top of the housing 2 so that one end is located in the internal space 7 and the other end is located in the internal space 7. The W-phase power terminal 8W penetrates the top of the housing 2 so that one end is located in the internal space 7 and the other end is located in the internal space 7. The U-phase power terminal 8U, the V-phase power terminal 8V, and the W-phase power terminal 8W are attached to the housing 2 so that they are not electrically connected to each other and to the housing 2.

[0024] Furthermore, the housing 2 has a suction pipe 11 and a discharge pipe 12. A flow path 14 is formed inside the suction pipe 11. The suction pipe 11 is connected to the housing 2 so that the flow path 14 is connected to the lower part of the internal space 7. A flow path 15 is formed inside the discharge pipe 12. The discharge pipe 12 is connected to the housing 2 so that the flow path 15 is connected to the upper part of the internal space 7.

[0025] The shaft 3 is formed in a rod shape and is arranged in the internal space 7 along a rotation axis 16, which is the central axis of the cylinder formed by the internal space 7. The shaft 3 is supported by the housing 2 so as to be rotatable around the rotation axis 16.

[0026] The three-phase motor 5 has a rotor 21 formed in a substantially cylindrical shape and a stator 22 formed in a substantially cylindrical shape. The rotor 21 is fixed to the shaft 3 and supported by the housing 2 so as to be rotatable about the rotation axis 16. The rotor 21 also has a plurality of permanent magnets (not shown) embedded and fixed inside the rotor 21.

[0027] Compression unit 6 is, for example, a rotary compression mechanism, and compresses the refrigerant supplied via suction pipe 11 as shaft 3 rotates. Compression unit 6 also supplies the compressed refrigerant to the space between three-phase motor 5 and compression unit 6 in internal space 7.

[0028] The stator 22 is disposed so as to surround the outer periphery of the rotor 21 and is fixed to the housing 2. The stator 22 also has a stator core 23, an upper insulator 24, a lower insulator 25, and a plurality of 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. The upper insulator 24 and the lower insulator 25 are formed from an insulating resin and insulate the stator core 23 from the windings 26 (conductors).

[0029] 2 is a top view showing stator core 23. Stator core 23 is formed into a cylindrical shape by stacking multiple plates made of a soft magnetic material, such as silicon steel plates. Stator core 23 also has nine teeth.

[0030] 2, stator core 23 has a yoke portion 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. Yoke portion 31 is formed in a substantially cylindrical shape and is disposed so that the central axis of yoke portion 31 overlaps with rotational axis 16 of rotor 21. One ends of the plurality of teeth 32-1 to 32-9 are formed so as to protrude from inner circumferential surface 33 of yoke portion 31 toward rotational axis 16 (toward the inside in the radial direction). In this embodiment, nine of the plurality of teeth 32-1 to 32-9 are formed on inner circumferential surface 33 of yoke portion 31 and arranged at equal intervals in the circumferential direction.

[0031] The radial direction is the direction of the diameter of a circle that is centered on the rotation axis 16 and is perpendicular to the rotation axis 16. The circumferential direction is the direction of the circumference of an imaginary circle that is centered on the rotation axis 16.

[0032] Fig. 3 is a top view showing the upper insulator 24 and the coils 50. Fig. 4 is a view focusing on three coils out of the multiple coils 50. Fig. 5 is a perspective view showing the insulator 24. Fig. 6 is a cross-sectional view of the three-phase motor 5 cut along the radial direction.

[0033] As shown in FIG. 3 , the upper insulator 24 has an outer wall portion 41, a plurality of hoisting drum portions 42-1, 42-2, 42-3, 42-4, 42-5, 42-6, 42-7, 42-8, and 42-9, and a plurality of flange portions 43-1, 43-2, 43-3, 43-4, 43-5, 43-6, 43-7, 43-8, and 43-9. The outer wall portion 41 is formed in a substantially cylindrical shape. The outer wall portion 41 has an inner circumferential surface 44 facing radially inward (toward the rotating shaft 16) and an outer circumferential surface 45 facing radially outward (away from the rotating shaft 16) of the outer wall portion 41. The outer wall portion 41 further has a housing portion 46, which will be described later.

[0034] The plurality of winding drum portions 42-1 to 42-9 are formed integrally with the outer wall portion 41 so as to protrude from the inner peripheral surface 44 of the outer wall portion 41 toward the rotary shaft 16, and are arranged on the inner peripheral surface 44 so as to be spaced at equal intervals in the circumferential direction. The plurality of flange portions 43-1 to 43-9 correspond to the plurality of winding drum portions 42-1 to 42-9, and are each formed in the shape of a substantially semicircular plate. The plurality of flange portions 43-1 to 43-9 are also formed contiguous to the inner diameter side end portions of the plurality of winding portions 42-1 to 42-9 (the other end different from the one end connected to the inner peripheral surface 44 of the outer wall portion 41).

[0035] The multiple winding drum portions 42-1 to 42-9 correspond to the multiple teeth portions 32-1 to 32-9 of the stator core 23. Nine coils 50-1 to 50-9 are formed by winding wire 26 (conductor wire) around each of the teeth portions 32 via the winding drum portion 42. In this embodiment, the coils 50-1 to 50-9 are arranged such that the order of U-phase, V-phase, and W-phase is repeated in the circumferential direction.

[0036] The number of teeth 32, winding drum 42, and coils 50 is not limited to nine, and the present invention is applicable as long as the number is 3n (n is a natural number of 2 or more).

[0037] The accommodating portions 46 accommodate the terminals 60. In this embodiment, the accommodating portions 46 are formed integrally with the insulator 24 at positions that divide the outer peripheral surface 45 into three equal parts in the circumferential direction.

[0038] Here, the three circumferentially adjacent tooth portions are defined as the first tooth portion, the second tooth portion, and the third tooth portion in the order in which they are arranged in the circumferential direction, and the three neutral wires 52 connected to the terminal 60 are defined as the first neutral wire 52-1 extending from the coil wound around the first tooth portion, the second neutral wire 52-2 extending from the coil wound around the second tooth portion, and the third neutral wire 52-3 extending from the coil wound around the third tooth portion.

[0039] 3, the three circumferentially adjacent teeth are teeth 32-9, 32-1, and 32-2. Similarly, the three circumferentially adjacent teeth can be teeth 32-3, 32-4, and 32-5, or teeth 32-6, 32-7, and 32-8. In this case, teeth 32-9, 32-3, and 32-6 correspond to the first teeth. Teeth 32-1, 32-4, and 32-7 correspond to the second teeth. Teeth 32-2, 32-5, and 32-8 correspond to the third teeth. Similarly, in Fig. 3, the coils wound around the first teeth correspond to coils 50-9, 50-3, and 50-6. The coils wound around the second teeth correspond to coils 50-1, 50-4, and 50-7. The coils wound around the third teeth correspond to coils 50-2, 50-5, and 50-8.

[0040] For example, in FIG. 4, three circumferentially adjacent teeth are teeth 32-3, 32-4, and 32-5. Teeth 32-3 corresponds to the first teeth, teeth 32-4 corresponds to the second teeth, and teeth 32-5 corresponds to the third teeth. Similarly, in FIG. 4, the coil wound around the first teeth corresponds to coil 50-3, the coil wound around the second teeth corresponds to coil 50-4, and the coil wound around the third teeth corresponds to coil 50-5.

[0041] When defined as above, when viewed from the direction of the rotating shaft 16 of the three-phase motor 5 (when viewed from above), the terminal 60 accommodated in the accommodation portion 46 is arranged so that the entire terminal 60 overlaps with the coil 50 wound around the second teeth in a radial direction perpendicular to the rotating shaft 16. For example, as shown in FIG. 3 , when viewed from the direction of the rotating shaft 16 (assuming that the dotted line 17 is the line of sight as seen from the rotating shaft 16), the terminal 60 is arranged so that the entire terminal 60 overlaps with the coil 50-4 wound around the teeth portion 32-4, which is the second teeth, in the radial direction. That is, when viewed from the direction of the rotating shaft 16, the angle θ1 formed between each of the circumferential ends of the terminal 60 and the rotating shaft 16 is smaller than the angle θ2 formed between each of the circumferential ends of the coil 50-4 and the rotating shaft 16, and the entire terminal 60 is located within the range of the angle θ2 in the circumferential direction.

[0042] In addition, the first neutral conductor 52-1, the second neutral conductor 52-2, and the third neutral conductor 52-3 shown in the figure are shown with their wire paths (trajectories) illustrated schematically for ease of understanding.

[0043] Three neutral wires 52 extending from each of the coils 50 for each of the three phases are connected to terminals 60 housed in housings 46 formed on the outer circumferential surface 45. Each of the three neutral wires 52 includes an outer circumferential conductor portion 56 drawn out from the outer wall portion 41 to the outer diameter side, and an inner circumferential conductor portion 57 drawn out from the outer wall portion 41 to the inner diameter side, and one end of the inner circumferential conductor portion 57 is electrically connected to the terminal 60.

[0044] In this embodiment, as shown in Figure 4, the upper insulator 24 has a pull-out portion 70 for pulling each of the three-phase neutral wires 52 out to the outer periphery of the insulator 24, and a pull-in portion 80 for pulling each of the three-phase neutral wires 52 pulled out to the outer periphery by the pull-out portion 70 into the inner periphery of the insulator 24.

[0045] That is, the outer conductor portion 56 refers to the portion of the neutral conductor 52 that is drawn out from the draw-out portion 70 to the outer circumferential side and drawn in to the draw-in portion 80. Similarly, the inner conductor portion 57 refers to the portion of the neutral conductor 52 that is drawn in from the draw-in portion 80 to the inner circumferential side and connected to the terminal 60 of the housing portion 46.

[0046] In this embodiment, two neutral wires 52, namely, the first neutral wire 52-1, the second neutral wire 52-2, and the third neutral wire 52-3, pass through at least one lead-in section 80. That is, in this embodiment, six lead-in sections 80 are formed, two on either side of each housing section 46. Nine lead-out sections 70 are formed, one on each side, for drawing out the neutral wires 52 extending from the nine coils 50-1 to 50-9.

[0047] 3, the second neutral conductor 52-2 extending from the coil 50-1 and the third neutral conductor 52-3 extending from the coil 50-2 pass through the lead-in section 80-2. The second neutral conductor 52-2 extending from the coil 50-4 and the third neutral conductor 52-3 extending from the coil 50-5 pass through the lead-in section 80-4. The second neutral conductor 52-2 extending from the coil 50-7 and the third neutral conductor 52-3 extending from the coil 50-8 pass through the lead-in section 80-6.

[0048] The lead-in portions 80 may be formed independently for each of the three phases, i.e., U phase, V phase, and W phase. That is, the same number of lead-in portions 80 as the lead-out portions 70 from which the neutral wires 52 are drawn may be formed so as to correspond to each other.

[0049] In this embodiment, the insulator 24 is formed with a fall prevention portion 90 that prevents the outer conductor portion 56 of the neutral conductor 52 from falling off the insulator 24. The fall prevention portion 90 is formed as a protrusion 75 that protrudes radially outward from the outer circumferential surface of the insulator 24. The fall prevention portion 90 restricts the outer conductor portion 56 of the neutral conductor 52 from moving up and down (toward the rotation axis 16). The fall prevention portion 90 is also formed between the lead-out portion 70 and the lead-in portion 80 in the circumferential direction. For example, in FIG. 4, the first neutral conductor 52-1 drawn out from the lead-out portion 70-3 passes through the lead-in portion 80-3 while being caught by the fall prevention portion 90a. Similarly, the second neutral conductor 52-2 drawn out from the lead-out portion 70-4 passes through the lead-in portion 80-4 while being caught by the fall prevention portion 90b.

[0050] 4, the third neutral conductor 52-3 drawn out from the lead-out portion 70-5 passes through the lead-in portion 80-4 while its movement in the vertical direction is restricted by fall-off prevention portions 90b, 90c, and 90d. The number and positions of the fall-off prevention portions 90 are not limited, and the fall-off prevention portions 90 may be formed at any position between the lead-out portion 70 and the lead-in portion 80 as long as they can prevent the outer conductor portion 56 of the neutral conductor 52 from falling off.

[0051] 4 and 6, the accommodating portion 46 has an inner diameter sidewall 54 facing the radially inside of the three-phase motor 5, and an outer diameter sidewall 55 facing the radially outside of the three-phase motor 5. A neutral conductor passage portion (slit) 47 through which the neutral conductor 52 passes is formed in each of the inner diameter sidewall 54 and the outer diameter sidewall 55. A protrusion 75 protruding radially outward from the outer diameter sidewall 55 is formed in the outer diameter sidewall 55 near the lower end of the slit 47. The neutral conductor 52 is cut at a position radially outside the outer diameter sidewall 55 while being supported by the protrusion 75.

[0052] The lead-in portion 80 is a slit through which the neutral conductor 52 passes. The bottom surface of the slit of the lead-in portion 80 is formed so as not to overlap the coil 50 in the height direction.

[0053] As described above, according to this embodiment, in a three-phase motor 5 having a stator core 23 having 3n (n is a natural number of 2 or more) tooth portions 32, an insulator 24 having an annular outer wall portion 41 and 3n winding drum portions 42 protruding inward from the outer wall portion 41, 3n coils 50 formed by winding conductors around the tooth portions 32 via the winding drum portions 42, and terminals 60 connecting three neutral wires 52 (52-1, 52-2, 52-3) extending from each of the coils 50 for three phases, the insulator 24 has an accommodating portion 46 for accommodating the terminal 60, and each of the three neutral wires 52 includes an outer circumferential conductor portion 56 drawn out radially outward from the outer wall portion 41 and an inner circumferential conductor portion 57 drawn in radially inward from the outer wall portion 41, and one end of the inner circumferential conductor portion is electrically connected to the terminal 60. As a result, each of the three-phase neutral wires 52 is first pulled out to the outer periphery of the insulator 24, then pulled in to the inner periphery, and then pulled from the center into the accommodating section 46. This prevents the neutral wires 52 of each phase from coming close to the coils 50 of different phases. This ensures appropriate insulation between the neutral wires 52 and coils 50 of different phases.

[0054] Furthermore, if the neutral wire 52 is pulled directly into the accommodating section 46 (housing) after the coil has been formed by the automatic winding machine, the neutral wire 52 will loosen once it is released from the hand, as it is not temporarily fixed. If the terminal is inserted into the accommodating section 46 in this loosened state, the neutral wire 52 may become loose and the distance to the coil 50 of a different phase may become shorter, which may result in the insulation being compromised.

[0055] In contrast, in the present invention, after winding the coil 50 around the tooth portion 32, the neutral conductor 52 is not directly drawn into the accommodation portion 46, but rather all three phases of the neutral conductor 52 are drawn out once to the outer periphery of the insulator 24. This allows the neutral conductor 52 to be drawn out under tension when drawn out to the outer periphery of the insulator 24, thereby minimizing the length of the conductor from the coil 50 to the lead-out portion 70 of the insulator 24 and preventing loosening. Furthermore, by drawing the neutral conductor 52 out to the outer periphery of the insulator 24 and then drawing it back in to the inner periphery of the insulator 24, the neutral conductor 52, which has been folded as it passes through the lead-out portion 70 and the lead-in portion 80, rubs against the lead-out portion 70 and the lead-in portion 80 of the insulator 24, and is temporarily fixed to the insulator 24, making it possible to maintain the neutral conductor 52 in a state in which tension is applied. This prevents the neutral conductor 52 from loosening before the terminal 60 is inserted into the accommodating portion 46 in a state where the neutral conductor 52 is drawn into the accommodating portion 47 from the inner circumferential side of the insulator 24 .

[0056] Furthermore, according to this embodiment, the insulator 24 has lead-out portions 70 for leading out each of the three neutral wires 52 to the outer periphery of the insulator 24, and lead-in portions 80 for leading in each of the three-phase neutral wires 52 led out to the outer periphery by the lead-out portions 70 to the inner periphery of the insulator 24. This allows for appropriate formation of outer periphery lead-out portions for preventing the neutral wires 52 from coming close to coils of different phases.

[0057] Furthermore, according to this embodiment, when the three circumferentially adjacent tooth portions 32 are arranged in circumferential order as the first tooth portion (tooth portion 32-3), the second tooth portion (tooth portion 32-4), and the third tooth portion (tooth portion 32-5), the three neutral wires 52 connected to the terminal 60 are the first neutral wire 52-1 extending from the coil 50 (coil 50-3) wound around the first tooth portion, the second neutral wire 52-2 extending from the coil 50 (coil 50-4) wound around the second tooth portion, and the third neutral wire 52-3 extending from the coil 50 (coil 50-5) wound around the third tooth portion, and at least one lead-in portion 80 is passed through by two neutral wires 52 out of the first neutral wire 52-1, the second neutral wire 52-2, and the third neutral wire 52-3. As a result, although the three neutral wires, the first neutral wire 52-1 to the third neutral wire 52-3, are of different phases, they are all connected to the same neutral point, so that even if the neutral wires 52 are close to each other, there is little electromagnetic influence between them. By utilizing this and allowing neutral wires 52 of multiple phases to pass through at least one lead-in section 80, the lead-in section 80 can be brought closer to the accommodating section 46 in the circumferential direction, and an appropriate insulation distance can be ensured between the neutral wires 52 of different phases and the coil 50.

[0058] Furthermore, according to this embodiment, when the three circumferentially adjacent teeth 32 are arranged in the order of the first teeth (teeth 32-3), the second teeth (teeth 32-4), and the third teeth (teeth 32-5), the three neutral wires 52 connected to the terminal 60 are the first neutral wire 52-1 extending from the coil 50 (coil 50-3) wound around the first teeth and the third neutral wire 52-2 extending from the coil 50 (coil 50-4) wound around the second teeth. The terminals 60 housed in the housing 46 are a second neutral wire 52-2 extending from the coil 50 (coil 50-4) wound around the third tooth portion, and a third neutral wire 52-3 extending from the coil 50 (coil 50-5) wound around the third tooth portion. When viewed from the direction of the rotation shaft 16 of the three-phase motor 5, the terminal 60 housed in the housing 46 is arranged so that the entire terminal 60 overlaps with the coil 50 (coil 50-4) wound around the second tooth portion (tooth portion 32-4) in a radial direction perpendicular to the rotation shaft 16. This allows the lead-out portion 70 to be appropriately formed to prevent the neutral wire 52 from coming close to the coil 50 of a different phase. In addition, it is difficult to mistakenly combine the three neutral wires 52 led into the housing 46. In contrast, if the terminal 60 does not overlap with the coil 50 of the second tooth portion in the circumferential direction, the neutral conductor 52 of one of the three phases cannot form the outer circumferential conductor portion 56, i.e., the neutral conductor cannot be pulled out to the outer circumferential side of the insulator 24.

[0059] Furthermore, according to this embodiment, the accommodating portion 46 has an inner diameter sidewall 54 located radially inward relative to the terminal 60 in a direction perpendicular to the rotation shaft 16 of the three-phase motor 5, and an outer diameter sidewall 55 located radially outward relative to the terminal 60 in a direction perpendicular to the rotation shaft 16 of the three-phase motor 5. Slits 47 serving as neutral conductor passages through which the neutral conductor 52 passes are formed in each of the inner diameter sidewall 54 and the outer diameter sidewall 55. The neutral conductor 52 is cut while supported by the protrusions 75 at a position radially outward from the outer diameter sidewall 55. As a result, the connecting wire 51 passing through the housing is pulled out from the radially outer side and cut at a position outer than the insulator 24. Since the neutral conductor 52 is cut by the blade while it is in the protrusions 75 serving as receiving portions radially outward from the coil 50 to prevent crimping failure, manufacturing reliability can be improved.

[0060] Furthermore, according to this embodiment, the insulator 24 is formed with a fall-off prevention portion 90 that prevents the outer conductor portion 53 of the neutral conductor 52 from falling off from the insulator 24, and the fall-off prevention portion 90 is formed in the circumferential direction between the pull-out portion 70 and the pull-in portion 80. As a result, the fall-off prevention portion 90 can prevent the outer conductor portion 56 of the neutral conductor 52 from coming off the insulator 24, which could cause the insulation distance to be lost.

[0061] Furthermore, according to this embodiment, the lead-in portion 80 is a slit through which the neutral conductor 52 passes, and the bottom surface of the slit is formed so as not to overlap the coil 50 in the height direction. This prevents the different-phase connection wire 51 from coming close to the coil 50 when the connection wire 51 of a different phase from the coil 50 in which the accommodation portion 46 (housing) is formed is led into the accommodation portion 46, thereby ensuring a sufficient insulation distance.

[0062] Furthermore, according to this embodiment, the accommodation portion 46 has an inner diameter sidewall 54 located radially inward relative to the terminal 60 in a direction perpendicular to the rotation shaft 16 of the three-phase motor 5, and an outer diameter sidewall 55 located radially outward relative to the terminal 60 in a direction perpendicular to the rotation shaft 16 of the three-phase motor 5. Slits 47 serving as neutral conductor passages through which the neutral conductor 52 passes are formed in each of the inner diameter sidewall 54 and the outer diameter sidewall 55, and the bottom surfaces of the slits forming the lead-out portion 70 are located at approximately the same height in the height direction as the slits 47 serving as neutral conductor passages. This prevents the neutral conductor 52 of a different phase from the coil 50 in which the accommodation portion 46 (housing) is formed from coming close to the coil 50, ensuring a sufficient insulation distance when the neutral conductor 52 of a different phase is drawn into the accommodation portion 46.

[0063] Furthermore, according to this embodiment, the compressor 1 includes a three-phase motor 5, a housing 2 that houses the three-phase motor 5, and a compression unit 6 that is housed inside the housing 2 and driven by the three-phase motor 5. This ensures insulation of the three-phase motor 5, thereby providing a compressor 1 with improved reliability.

[0064] FIG. 7 is an enlarged view showing a three-phase motor 5 according to another embodiment. This embodiment is characterized in that the height of the bottom surface of the slit serving as the lead-in portion 80 (height from the lower end of the insulator 24) is substantially the same as the height of the bottom surface of the neutral conductor passage 47 (height from the lower end of the insulator 24) (see H1 and H2 in FIG. 7). Other than that, this embodiment is similar to the three-phase motor 5 according to the embodiment in FIG. 5. That is, the bottom surface of the lead-in portion 80 (slit) is located at substantially the same height as the bottom surface of the neutral conductor passage 47. This allows the inner conductor portion 57 to be bridged from the lead-in portion 80 to the neutral conductor passage 47 in parallel with the horizontal direction when the direction perpendicular to the rotating shaft 16 is defined as the horizontal direction. This ensures appropriate insulation between the neutral conductor 52 and the coil 50, which are out of phase with each other, while further suppressing loosening of the neutral conductor 52. [Explanation of symbols]

[0065] 1...Compressor 5...3-phase motor 16...Rotation axis 23... Stator core 24...Upper insulator 26...Multiple windings 32...Teeth part 42...winding body 46...Storage section 47...Neutral conductor passage (slit) 50...Coil 54...Inner diameter side wall 55...Outer diameter side wall 56...Outer conductor section 57…Inner conductor part 60...Terminal 70...Drawer section (slit) 75...Protrusion 80...Retraction section (slit) 90... Falling prevention part

Claims

1. A three-phase motor having a stator core having 3n (n is a natural number of 2 or more) teeth, an insulator having an annular outer wall and 3n winding drums protruding inward from the outer wall, 3n coils formed by winding conducting wires around the teeth via the winding drums, and terminals connecting three neutral wires extending from each of the coils for three phases, the insulator has a lead-out portion for leading out each of the three neutral wires to the outer periphery of the insulator, and a lead-in portion for leading in each of the three-phase neutral wires led out to the outer periphery by the lead-out portion to the inner periphery of the insulator, and has an accommodating portion for accommodating the terminal; All three neutral wires include an outer conductor portion drawn from the outer wall portion to the outer diameter side and an inner conductor portion drawn from the outer wall portion to the inner diameter side, and one end of the inner conductor portion is electrically connected to the terminal, the lead-in portion has a first lead-in portion for leading in at least one of the three neutral wires and a second lead-in portion for leading in at least another of the three neutral wires; The receiving portion is formed between the first leading portion and the second leading portion in the circumferential direction. Three-phase motor.

2. 2. The three-phase motor according to claim 1, When the three teeth portions adjacent to each other in the circumferential direction are a first teeth portion, a second teeth portion, and a third teeth portion in the order in which they are arranged in the circumferential direction, the three neutral wires connected to the terminals include a first neutral wire extending from the coil wound around the first teeth, a second neutral wire extending from the coil wound around the second teeth, and a third neutral wire extending from the coil wound around the third teeth, The first lead-in portion is a portion through which the second neutral conductor and the third neutral conductor pass. Three-phase motor.

3. 2. The three-phase motor according to claim 1, When the three teeth portions adjacent to each other in the circumferential direction are a first teeth portion, a second teeth portion, and a third teeth portion in the order in which they are arranged in the circumferential direction, the three neutral wires connected to the terminals include a first neutral wire extending from the coil wound around the first teeth, a second neutral wire extending from the coil wound around the second teeth, and a third neutral wire extending from the coil wound around the third teeth, When viewed from the direction of the rotation axis of the three-phase motor, the terminal accommodated in the accommodation portion is arranged so that the entire terminal overlaps with the coil wound around the second teeth portion in a radial direction perpendicular to the rotation axis. Three-phase motor.

4. 2. The three-phase motor according to claim 1, the accommodating portion has an inner diameter sidewall located radially inward relative to the terminal in a direction perpendicular to the rotation shaft of the three-phase motor, and an outer diameter sidewall located radially outward relative to the terminal in a direction perpendicular to the rotation shaft of the three-phase motor, and a neutral conductor passing portion through which the neutral conductor passes is formed in each of the inner diameter sidewall and the outer diameter sidewall; The neutral conductor is cut at a position radially outward of the outer diameter side wall. Three-phase motor.

5. 2. The three-phase motor according to claim 1, the insulator is formed with a fall-off prevention portion that prevents the outer conductor portion of the neutral conductor from falling off the insulator, The fall-off prevention portion is formed between the lead-out portion and the lead-in portion in the circumferential direction. Three-phase motor.

6. 2. The three-phase motor according to claim 1, The lead-in portion is a slit through which the neutral conductor passes, The bottom surface of the slit is formed so as not to overlap with the coil in the height direction. Three-phase motor.

7. 7. The three-phase motor according to claim 6, the accommodating portion has an inner diameter sidewall located radially inward relative to the terminals in a direction perpendicular to the rotation shaft of the three-phase motor, and an outer diameter sidewall located radially outward relative to the terminals in a direction around the rotation shaft of the three-phase motor, and a neutral conductor passing portion through which the neutral conductor passes is formed in each of the inner diameter sidewall and the outer diameter sidewall; The bottom surface of the slit is located at approximately the same height as the bottom surface of the neutral conductor passage portion in the height direction. Three-phase motor.

8. A three-phase motor according to any one of claims 1 to 7; a compressor main body container that houses the three-phase motor therein; a compression mechanism section housed inside the compressor main body container and driven by the three-phase motor; A compressor comprising:

Images