motor

Abstract

This suppresses the decrease in the space utilization rate. [Solution] The motor comprises a cylindrical stator and a rotor positioned inside the stator and supported to be rotatable around a rotation axis. The stator has a stator core comprising an annular yoke portion and a tooth portion 321 protruding from the yoke portion toward the rotation axis, an upper insulator comprising a winding drum portion 421 along the tooth portion 321, a coil 89 wound around the tooth portion 321 together with the winding drum portion 421, and an insulating film 261 separating the tooth portion 321 and the coil 89. On the right side surface 45 of the circumferential end of the winding drum portion 421 around the rotation axis, a right-side restricting portion 51 is formed along the parting line, where the axial end face 85 of the insulating film 261 faces the right side surface 45, restricting the axial movement of the insulating film 261.

Description

Technical Field

[0001] The technology of the present disclosure relates to a motor.

Background Art

[0002] There is known a motor used in a compressor that compresses a refrigerant, the motor including an insulator wound around a coil together with a tooth portion of a stator core, and an insulating film that separates the tooth portion and the coil. In such a motor, a locking portion is formed on the insulator so that the insulating film does not shift in the axial direction (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, when the insulator is formed by injection molding, burrs or steps may be formed on a parting line corresponding to a mold joint of the insulator. In a motor using such an insulator, if the insulating film rides on the burrs or steps, the space where the coil is disposed in the slot between the two tooth portions decreases, and the fill factor, which is the ratio of the cross-sectional area of the coil to the slot area, decreases, which may cause a decrease in output.

[0005] The disclosed technology has been made in view of such a point, and an object thereof is to provide a motor that suppresses a decrease in the fill factor.

Means for Solving the Problems

[0006] A motor according to one aspect of the present disclosure comprises a cylindrical stator and a rotor disposed inside the stator and supported so as to be rotatable around a rotation axis. The stator has a stator core having an annular yoke portion and a teeth portion projecting from the yoke portion toward the rotation axis, an insulator having a winding drum portion along the teeth portion, a coil wound around the teeth portion together with the winding drum portion, and an insulating film separating the teeth portion and the coil. First restricting portions are formed on the side surfaces of both ends of the winding drum portion in the circumferential direction around the rotation axis, along a parting line formed in the insulator. The first restricting portions face the end faces of the insulating film in the axial direction parallel to the rotation axis and restrict the movement of the insulating film in the axial direction. [Effects of the Invention]

[0007] The disclosed motor can suppress the decrease in space factor. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a longitudinal cross-sectional view showing a compressor in which the motor of Embodiment 1 is installed. [Figure 2] Figure 2 is an exploded perspective view showing the stator of the compressor in Example 1. [Figure 3] Figure 3 is a perspective view showing one of the multiple drum sections of the upper insulator. [Figure 4] Figure 4 is a cross-sectional view showing the winding drum portion. [Figure 5] Figure 5 is a bottom view showing the winding drum portion. [Figure 6] Figure 6 is a side cross-sectional view showing the outer periphery wall portion and the winding drum portion of the upper insulator. [Figure 7] Figure 7 is a perspective view showing the stator core and the upper insulator. [Figure 8] Figure 8 is a top view showing one of several insulating films. [Figure 9] Figure 9 is a longitudinal cross-sectional view showing the insulating film attached to the stator core. [Figure 10] Figure 10 is a perspective view showing the insulating film attached to the stator core. [Figure 11] Figure 11 is a cross-sectional view showing the insulating film attached to the stator core. [Figure 12] Figure 12 is a longitudinal cross-sectional view showing the teeth portion of a stator core with the lower insulator, upper insulator, and multiple insulating films properly attached. [Figure 13] Figure 13 is a cross-sectional view showing the insulating film attached to the stator core of the motor of Comparative Example 1. [Figure 14] Figure 14 is a cross-sectional view showing the insulating film attached to the stator core of the motor in Comparative Example 2. [Figure 15] Figure 15 is a cross-sectional view showing the insulating film attached to the stator core of the motor in Comparative Example 3. [Figure 16] Figure 16 is a longitudinal cross-sectional view showing the insulating film when multiple winding drum portions of the motor of Comparative Example 3 are attached to the stator core. [Figure 17] Figure 17 is a cross-sectional view showing the insulating film attached to the stator core of the motor of Comparative Example 4. [Figure 18] Figure 18 is a longitudinal cross-sectional view showing the insulating film when multiple winding drum portions of the motor of Comparative Example 4 are attached to the stator core. [Figure 19] Figure 19 is a cross-sectional view showing the insulating film attached to the stator core of the motor of Comparative Example 5. [Figure 20] Figure 20 is a longitudinal cross-sectional view showing the coil wound around the teeth portion of the motor in Comparative Example 5. [Figure 21] Figure 21 is a perspective view showing the motor insulator of Example 2. [Figure 22] Figure 22 is another perspective view showing the motor insulator of Example 2. [Figure 23] FIG. 23 is a cross-sectional view showing the drum portion of the motor of Example 2.

MODE FOR CARRYING OUT THE INVENTION

[0009] The motor according to the embodiment disclosed in the present application will be described below with reference to the drawings. Note that the technology of the present disclosure is not limited by the following description. Also, in the following description, the same reference numerals are given to the same components, and duplicate descriptions are omitted.

EXAMPLE

[0010] As shown in FIG. 1, the motor 5 of Example 1 is provided in the compressor 1. FIG. 1 is a longitudinal sectional view showing the compressor 1 in which the motor 5 of Example 1 is provided. The compressor 1 includes a container 2, a shaft 3, a motor 5, and a compression section 6. An enclosed internal space 7 is formed inside the container 2. The internal space 7 is generally formed in a cylindrical shape. The container 2 is formed such that when it is vertically placed on a horizontal plane, the central axis of the cylinder of the internal space 7 is parallel to the vertical direction.

[0011] The container 2 includes a U-phase power supply terminal 8U, a V-phase power supply terminal 8V, and a W-phase power supply terminal 8W. The U-phase power supply terminal 8U is formed of a conductor. The U-phase power supply terminal 8U penetrates the upper part of the container 2 such that one end is disposed in the internal space 7 and the other end is disposed outside the container 2. The V-phase power supply terminal 8V is formed of a conductor. The V-phase power supply terminal 8V penetrates the upper part of the container 2 such that one end is disposed in the internal space 7 and the other end is disposed outside the container 2. The W-phase power supply terminal 8W is formed of a conductor. The W-phase power supply terminal 8W penetrates the upper part of the container 2 such that one end is disposed in the internal space 7 and the other end is disposed outside the container 2. The U-phase power supply terminal 8U, the V-phase power supply terminal 8V, and the W-phase power supply terminal 8W are attached to the container 2 so as not to be electrically connected to each other and not to be electrically connected to the container 2.

[0012] The container 2 further comprises an intake pipe 11 and a discharge pipe 12. A flow path 14 is formed inside the intake pipe 11. The intake pipe 11 is joined to the container 2 such 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 joined to the container 2 such that the flow path 15 is connected to the upper part of the internal space 7. The shaft 3 is formed in a rod shape. The shaft 3 is positioned in the internal space 7 along a rotation axis 16 that is along the central axis of the cylinder formed by the internal space 7, and is supported by the container 2 so as to be rotatable about the rotation axis 16.

[0013] The motor 5 is located at the top of the internal space 7. The motor 5 comprises a rotor 21 and a stator 22. The rotor 21 is generally cylindrical in shape. The rotor 21 is fixed to the shaft 3 and supported by the container 2 so as to be rotatable around the rotation axis 16. The rotor 21 comprises a plurality of permanent magnets (not shown). The plurality of permanent magnets are embedded inside the rotor 21 and fixed to the rotor 21. The stator 22 is generally cylindrical in shape. The stator 22 is positioned to surround the outer circumference of the rotor 21 and is fixed to the container 2.

[0014] The compression unit 6 is located below the motor 5 in the internal space 7. The compression unit 6 is a rotary-type compression mechanism in which the shaft 3 rotates to compress the refrigerant supplied through the suction pipe 11, and the compressed refrigerant is supplied to the space between the motor 5 and the compression unit 6 in the internal space 7.

[0015] Figure 2 is an exploded perspective view showing the stator 22 of the compressor 1 of Embodiment 1. The stator 22 comprises a stator core 23, a lower insulator 24, an upper insulator 25, and a plurality of insulating films 26. The stator core 23 is formed in a columnar shape and is formed by laminating a plurality of electromagnetic steel sheets, which are made of a soft magnetic material such as silicon steel sheets, in the height direction of the column. A lower end surface 27 and an upper end surface 28 are formed at the portions of the stator core 23 corresponding to the two bottom surfaces of the columnar body.

[0016] The stator core 23 comprises a yoke portion 31 and a plurality of tooth portions 32. The yoke portion 31 is formed in a generally cylindrical shape, and is positioned so that the central axis of the cylinder coincides with the axis of rotation 16. An inner circumferential surface 33 is formed on the yoke portion 31. The inner circumferential surface 33 follows the cylindrical surface and is oriented toward the axis of rotation 16.

[0017] Multiple tooth portions 32 are arranged inside the yoke portion 31 and are spaced equally in the circumferential direction around the rotation axis 16. One of the multiple tooth portions 32, tooth portion 321, is formed in a generally rectangular prism shape. The tooth portion 321 is integrally formed with the yoke portion 31 such that one end of the tooth portion 321 is adjacent to the inner circumferential surface 33 of the yoke portion 31. That is, the stator core 23 is formed such that the tooth portion 321 protrudes from the inner circumferential surface 33 of the yoke portion 31 toward the rotation axis 16. Other tooth portions of the multiple tooth portions 32, different from tooth portion 321, are formed in a generally rectangular prism shape, similar to tooth portion 321, and are integrally formed with the yoke portion 31. The yoke portion 31 has a portion of its upper end surface 28 and a portion of its lower end surface 27 formed on it. The multiple tooth portions 32 have the remaining portion of their upper end surface 28 and the remaining portion of their lower end surface 27 formed on them.

[0018] Multiple slots 34 are formed in the stator core 23. Each of the multiple slots 34 is the space between two adjacent tooth portions of the multiple tooth portions 32.

[0019] The lower insulator 24 is made of an insulating material. The lower insulator 24 comprises an outer peripheral wall portion 41 and a plurality of winding drum portions 42. The outer peripheral wall portion 41 is formed in a generally cylindrical shape. An inner peripheral surface 43 is formed on the outer peripheral wall portion 41. The inner peripheral surface 43 follows the cylindrical surface and is oriented toward the rotation axis 16. The plurality of winding drum portions 42 are arranged inside the outer peripheral wall portion 41 and are arranged at equal intervals in the circumferential direction.

[0020] A mounting surface 44 is further formed on the lower insulator 24. The mounting surface 44 is formed flat along a plane perpendicular to the rotation axis 16. A portion of the mounting surface 44 is formed on the outer peripheral wall portion 41, and the remaining portion of the mounting surface 44 is formed on the multiple winding drum portions 42. The lower insulator 24 is arranged such that the mounting surface 44 and the lower end surface 27 face each other.

[0021] The upper insulator 25, like the lower insulator 24, comprises an outer peripheral wall portion 41 and a plurality of winding drum portions 42, and has an inner peripheral surface 43 and a mounting surface 44. The upper insulator 25 is positioned such that the mounting surface 44 and the upper end surface 28 face each other.

[0022] Each of the multiple insulating films 26 is formed from an insulator and is formed in a bent sheet shape. The multiple insulating films 26 are each placed in one of the multiple slots 34.

[0023] Figure 3 is a perspective view showing one of the multiple drum portions 42 of the upper insulator 25, specifically one drum portion 421. The drum portion 421 is generally formed in a columnar shape. The drum portion 421 is integrally formed with the outer circumferential wall portion 41 such that a portion corresponding to one of the bottom surfaces of the column is adjacent to the outer circumferential wall portion 41. In other words, the upper insulator 25 is formed such that the multiple drum portions 42 protrude from the inner circumferential surface 43 of the outer circumferential wall portion 41 toward the rotation axis 16.

[0024] Figure 4 is a cross-sectional view showing the winding drum portion 421. The right side surface 45 and the left side surface 46 are formed at both ends of the winding drum portion 421 in the circumferential direction.

[0025] On the right side surface 45, a right-side restricting portion 51, which is the first restricting portion in Embodiment 1, and a right-side recess 52 are formed. A right-side axial restricting surface 54 is formed on the right-side restricting portion (first restricting portion) 51. The right-side axial restricting surface 54 is formed to align with a parting line plane 53 that is parallel to the plane along which the mounting surface 44 is aligned, and to face the stator core 23.

[0026] The right-side recess 52 is formed in the region of the right-side surface 45 that is closer to the mounting surface 44 than the right-side restricting portion 51. The winding drum portion 421 is formed such that the right-side recess 52 is recessed from the right-side surface 45. That is, a right-side axial restricting surface 54 is formed on the axial end face of the right-side recess 52. A right-side circumferential restricting surface 55 is further formed in the right-side recess 52. The right-side recess 52 is formed such that the right-side circumferential restricting surface 55 is aligned with a plane 56, so that the bottom of the right-side recess 52 is formed by the right-side circumferential restricting surface 55. The plane 56 is perpendicular to the plane along which the mounting surface 44 is aligned and parallel to the longitudinal direction of the winding drum portion 421.

[0027] On the left side surface 46, a left-side restricting portion 61 and a left-side recess 62 are formed, which are the first restricting portion in Embodiment 1. A left-side axial restricting surface 64 is formed on the left-side restricting portion (first restricting portion) 61. The left-side axial restricting surface 64 is formed so as to be along the parting line plane 53 and so as to be opposite the stator core 23.

[0028] The left recess 62 is formed in the area of ​​the left side surface 46 that is closer to the mounting surface 44 than the left restricting portion 61. The winding drum portion 421 is formed such that the left recess 62 is recessed from the left side surface 46. That is, a left axial restricting surface 64 is formed on the axial end face of the left recess 62. A left circumferential restricting surface 65 is further formed in the left recess 62. The left recess 62 is formed such that the left circumferential restricting surface 65 is aligned with the plane 66, so that the bottom of the left recess 62 is formed by the left circumferential restricting surface 65. The plane 66 is parallel to the plane 56, that is, perpendicular to the plane along which the mounting surface 44 is aligned, and parallel to the longitudinal direction of the winding drum portion 421.

[0029] Figure 5 is a bottom view showing the winding drum portion 421. The winding drum portion 421 is formed such that the distance between the right recess 52 and the left recess 62 in the width direction 67 is the width T1. The width direction 67 is perpendicular to the longitudinal direction 68 of the winding drum portion 421 and is also perpendicular to the rotation axis 16. That is, the width T1 is equal to the distance between the right circumferential regulating surface 55 and the left circumferential regulating surface 65 of the winding drum portion 421, and is equal to the distance between the plane 56 and the plane 66. Furthermore, the winding drum portion 421 is formed such that the distance between the right side surface 45 and the left side surface 46 in the width direction 67 is the width T2. That is, the width T2 is equal to the distance between the right side surface 45 and the left side surface 46 of the winding drum portion 421, and is equal to the distance between the plane 47 and the plane 48 when the winding drum portion 421 is sandwiched between two planes (plane 47 and plane 48) perpendicular to the width direction 67.

[0030] Figure 6 is a side cross-sectional view showing the outer peripheral wall portion 41 and the winding drum portion 421 of the upper insulator 25. Multiple second restricting portions 71 are formed on the inner peripheral surface 43 of the outer peripheral wall portion 41. Each of the multiple second restricting portions 71 is formed in the region of the inner peripheral surface 43 sandwiched between two adjacent winding drum portions. The outer peripheral wall portion 41 is formed such that the multiple second restricting portions 71 are recessed from the inner peripheral surface 43. Each of the multiple second restricting portions 71 has an axial restricting surface 72 and a radial restricting surface 73. Each of the multiple second restricting portions 71 is formed such that the axial restricting surface 72 faces the stator core 23 and the axial restricting surface 72 is aligned with the parting line plane 53. Each of the multiple second restricting portions 71 is further formed such that a recessed bottom from the inner circumferential surface 43 is formed by a radial restricting surface 73, and the radial restricting surface 73 faces the rotation axis 16.

[0031] The upper insulator 25 is formed such that the distance between the plane along which the mounting surface 44 is aligned and the parting line plane 53 is distance L1. That is, distance L1 is equal to the distance from the mounting surface 44 to the axial restricting surface 72 of the plurality of second restricting parts 71, and equal to the distance from the mounting surface 44 to the right restricting part 51.

[0032] The upper insulator 25 is manufactured by injection molding using multiple molds. The upper insulator 25 is formed such that the parting line that occurs at the joint of the multiple molds of the upper insulator 25 follows the parting line plane 53. The lower insulator 24 is manufactured by injection molding, similar to the upper insulator 25, with multiple second restricting portions 71 formed therein.

[0033] Figure 7 is a perspective view showing the stator core 23 and the upper insulator 25. The upper insulator 25 is attached to the stator core 23 such that its mounting surface 44 is in contact with the upper end surface 28 of the stator core 23, and that multiple winding drum portions 42 each cover multiple regions formed on multiple tooth portions 32 of the upper end surface 28. The lower insulator 24 is attached to the stator core 23 in the same manner as the upper insulator 25, such that its mounting surface 44 is in contact with the lower end surface 27 of the stator core 23, and that multiple winding drum portions 42 each cover multiple regions formed on multiple tooth portions 32 of the lower end surface 27.

[0034] Figure 8 is a top view showing one of the insulating films 261 among a plurality of insulating films 26. The thickness of the insulating film 261 is t. The insulating film 261 comprises a first tooth covering portion 81, a second tooth covering portion 82, and a yoke covering portion 83. The yoke covering portion 83 is positioned between the first tooth covering portion 81 and the second tooth covering portion 82.

[0035] Figure 9 is a longitudinal cross-sectional view showing an insulating film 261 attached to the stator core 23. The insulating film 261 is formed such that the axial length L3 of the insulating film 261 satisfies the following equation (1). L2 ≤ L3 ≤ L2 + L1 × 2 …(1) Here, length L2 is the axial length of the teeth portion 321 and is equal to the distance between the lower end face 27 and the upper end face 28 of the stator core 23. Other insulating films among the multiple insulating films 26 that are different from insulating film 261 are formed in the same manner as insulating film 261.

[0036] Figure 10 is a perspective view showing an insulating film 261 attached to the stator core 23. The insulating film 261 is placed in one of the multiple slots 34 of the stator core 23, and is attached to the stator core 23. In other words, multiple insulating films 26 are placed in multiple slots 34 of the stator core 23 and are attached to the stator core 23.

[0037] The first tooth covering portion 81 of the insulating film 261 covers the side surface of one tooth portion 321 of the multiple tooth portions 32 facing the slot 341 when the multiple insulating films 26 are properly attached to the stator core 23. The second tooth covering portion 82 of the insulating film 261 covers the side surfaces of the other tooth portions 322 of the multiple tooth portions 322 facing the slot 341 when the multiple insulating films 26 are properly attached to the stator core 23. The yoke covering portion 83 of the insulating film 261 covers the area between the tooth portions 321 and 322 of the inner circumferential surface 33 when the multiple insulating films 26 are properly attached to the stator core 23. Figure 11 is a cross-sectional view showing the insulating film 261 attached to the stator core 23. The side of the tooth portion 321 facing the other slots 342 is covered by the second tooth covering portion 82 of the other insulating film 262 when the multiple insulating films 26 are properly attached to the stator core 23.

[0038] The winding drum portion 421 is formed such that width T1 and width T2 satisfy the following equation (2). T1 ≤ T3 <T2≦T3+t×2…(2) Here, width T3 is the width of the teeth portion 321 in the width direction 67, and is equal to the distance between the side of the teeth portion 321 facing slot 341 and the side facing slot 342. The multiple winding drum portions 42 of the lower insulator 24 are formed in the same manner as the multiple winding drum portions 42 of the upper insulator 25.

[0039] Figure 12 is a longitudinal cross-sectional view showing the teeth portion 321 of the stator core 23 with the lower insulator 24, upper insulator 25, and multiple insulating films 26 properly attached. The end faces 85 of the multiple insulating films 26 on the upper insulator 25 side face the right axial restricting surface 54 of the right restricting portion 51 and the left axial restricting surface 64 of the left restricting portion 61 of the upper insulator 25 when the multiple insulating films 26 are properly attached to the stator core 23. The end faces 86 of the multiple insulating films 26 on the lower insulator 24 side face the right axial restricting surface 54 of the right restricting portion 51 and the left axial restricting surface 64 of the left restricting portion 61 of the lower insulator 24 when the multiple insulating films 26 are properly attached to the stator core 23.

[0040] Although not shown, the end faces 85 of the multiple insulating films 26 further face the axial restricting surfaces 72 of the multiple second restricting portions 71 of the upper insulator 25. The end faces 86 of the multiple insulating films 26 further face the axial restricting surfaces 72 of the multiple second restricting portions 71 of the lower insulator 24.

[0041] The stator 22 further comprises a plurality of coils wound around a plurality of tooth sections 32. Each of the plurality of coils is formed from a conductor made of copper wire coated with enamel. Each of the plurality of coils is formed by winding a conductor around one of the tooth sections 32, together with one of the plurality of winding drum sections 42 of the lower insulator 24 and one of the plurality of winding drum sections 42 of the upper insulator 25. One end of the conductor is connected to one of the power terminals, the U-phase power terminal 8U, the V-phase power terminal 8V, and the W-phase power terminal 8W, and the other end of the conductor is connected to the neutral point.

[0042] One coil 89, which corresponds to the tooth portion 321 of the multiple coils, is wound around the tooth portion 321 together with one winding drum portion 421 of the lower insulator 24 and one winding drum portion 421 of the upper insulator 25, and is attached to the stator core 23. The other coils, which are different from coil 89 among the multiple coils, are wound around one tooth portion of the multiple tooth portions 32 together with one winding drum portion of the lower insulator 24 and one winding drum portion of the upper insulator 25, and are attached to the stator core 23, similar to coil 89.

[0043] As the above-described equation (1) is satisfied, the motor 5 can cover the surfaces of the stator core 23 facing multiple slots 34 with multiple insulating films 26. By covering the surfaces of the stator core 23 facing multiple slots 34 with multiple insulating films 26, the motor 5 can prevent the stator core 23 from making electrical contact with multiple coils.

[0044] Since the motor 5 satisfies equation (1) described above, the end faces 85 and 86 of the multiple insulating films 26 can be positioned to face the right axial restricting surface 54, the left axial restricting surface 64, and the axial restricting surface 72. Because the end faces 85 and 86 of the multiple insulating films 26 face the axial restricting surfaces (right axial restricting surface 54, left axial restricting surface 64) formed on the multiple winding drum portions 42 of the upper insulator 25 and the axial restricting surface (axial restricting surface 72) formed on the outer peripheral wall portion 41 of the upper insulator 25, the motor 5 can suppress axial displacement of the multiple insulating films 26 from a state in which the multiple insulating films 26 are properly attached. Since axial displacement of the multiple insulating films 26 is suppressed, the motor 5 can suppress the fact that a part of the surface of the stator core 23 facing the multiple slots 34 is not covered by the multiple insulating films 26. The motor 5 can more reliably prevent the stator core 23 from electrically contacting multiple coils by suppressing the fact that a portion of the surface of the stator core 23 facing multiple slots 34 is not covered by the multiple insulating films 26.

[0045] Motor 5 can prevent the end faces 85 and 86 of the multiple insulating films 26 from ceasing to face the right axial regulating surface 54, the left axial regulating surface 64, and the axial regulating surface 72, as the previously described equation (2) is satisfied. By preventing the end faces 85 and 86 of the multiple insulating films 26 from ceasing to face the right axial regulating surface 54, the left axial regulating surface 64, and the axial regulating surface 72, motor 5 can suppress the axial displacement of the multiple insulating films 26.

[0046] By satisfying equation (2) described above, the motor 5 can further suppress the formation of gaps between the insulating film 261 and the teeth portion 321, and between the insulating film 261 and the coil 89. Such gaps can increase the dead space in which multiple coils among the multiple slots 34 are not placed. The space utilization ratio, calculated by dividing the area of ​​the coil cross-section where the region in which multiple coils among the multiple slots 34 are placed intersects with a plane perpendicular to the rotation axis 16 by the area of ​​the slot cross-section where the multiple slots 34 intersect with that plane, decreases as the dead space increases. By suppressing the formation of such gaps, the motor 5 can suppress a decrease in space utilization ratio.

[0047] Molded products manufactured by injection molding may have burrs (protrusions) formed along the parting line. In the motor 5, the axial restricting surfaces (right axial restricting surface 54, left axial restricting surface 64) of the first restricting section (right restricting section 51, left restricting section 61) and the axial restricting surface 72 of the second restricting section 71 are formed along the parting line plane 53. This prevents the multiple insulating films 26 from being obstructed by the burrs and not being positioned in the correct location, even when burrs (protrusions) are formed along the parting line. By preventing the multiple insulating films 26 from being positioned in the correct location, the motor 5 can prevent an increase in dead space. Cases where the multiple insulating films 26 are not positioned in the correct location will be described later using a comparative example.

[0048] [Operation of Compressor 1] The compressor 1 is installed in a refrigeration cycle device (not shown). The stator 22 of the motor 5 generates a rotating magnetic field in the space inside the stator 22 by appropriately applying three-phase voltages to multiple coils via the U-phase power terminal 8U, the V-phase power terminal 8V, and the W-phase power terminal 8W. The rotor 21 rotates due to the rotating magnetic field generated by the stator 22. The shaft 3 transmits the rotation of the rotor 21 to the compression unit 6. As the shaft 3 rotates, the compression unit 6 draws in low-pressure gas refrigerant from the device upstream of the compressor 1 in the refrigeration cycle device via the suction pipe 11, compresses the drawn-in low-pressure gas refrigerant to generate high-pressure gas refrigerant, and supplies this high-pressure gas refrigerant to the space between the compression unit 6 and the motor 5 in the internal space 7.

[0049] The high-pressure gas refrigerant supplied to the space between the compression unit 6 and the motor 5 within the internal space 7 passes through a gap formed in the motor 5 and is supplied to the space above the motor 5 within the internal space 7. The high-pressure gas refrigerant supplied to the space above the motor 5 within the internal space 7 is discharged via the discharge pipe 12 to the downstream equipment of the refrigeration cycle system, where the compressor 1 is located. As the high-pressure gas refrigerant is discharged to the downstream equipment, the refrigerant circulates within the refrigeration cycle system.

[0050] Because the motor 5 has a suppressed decrease in its space utilization ratio, it can efficiently generate rotational power to rotate the shaft 3, thereby enabling the shaft 3 to rotate efficiently. The compressor 1 can efficiently compress the refrigerant because the motor 5 generates rotational power efficiently, and can efficiently circulate the refrigerant to the refrigeration cycle device.

[0051] Figure 13 is a cross-sectional view showing an insulating film 261 attached to the stator core 23 of the motor of Comparative Example 1. In the motor of Comparative Example 1, the multiple insulating films 26 of the motor 5 of Example 1 described above are replaced with multiple other insulating films. Each of the multiple insulating films of the motor of Comparative Example 1 is formed such that its axial length L3 satisfies the following equation (3). L3 <L2…(3) In this case, some of the sides of the multiple teeth portions 32 are not covered by the multiple insulating films 26. The motor 5 of Embodiment 1 described above can cover all of the sides of the multiple teeth portions 32 with the multiple insulating films 26, and can more reliably prevent the stator core 23 from electrically contacting the coil compared to the motor of Comparative Example 1.

[0052] Figure 14 is a cross-sectional view showing an insulating film 261 attached to the stator core 23 of the motor of Comparative Example 2. In the motor of Comparative Example 2, the multiple insulating films 26 of the motor 5 of Example 1 described above are replaced with multiple other insulating films. Each of the multiple insulating films of the motor of Comparative Example 2 is formed such that its axial length L3 satisfies the following equation (4). L2 + L1 × 2 <L3…(4) In this case, the axial ends of the multiple insulating films 26 may ride up onto the right or left side surface 46 of the lower insulator 24 or the upper insulator 25. In the motor of Comparative Example 2, the ends of the multiple insulating films 26 may ride up onto the right or left side surface 45 or the left side surface 46, causing the end faces 85 and 86 of the multiple insulating films 26 to no longer face each other, or creating a gap between the insulating film 261 and the teeth portion 321. Compared to the motor of Comparative Example 2, the motor 5 of Example 1 described above can more reliably prevent the multiple insulating films 26 from shifting in the axial direction, and can more reliably suppress the decrease in the space factor.

[0053] The motor of Comparative Example 3 has multiple winding drum portions 42 of the motor 5 of Example 1 described above replaced with other winding drum portions. Figure 15 is a cross-sectional view showing the insulating film 261 attached to the stator core 23 of the motor of Comparative Example 3. Figure 16 is a longitudinal cross-sectional view showing the insulating film 261 when the multiple winding drum portions of the motor of Comparative Example 3 are attached to the stator core 23. Each of the multiple winding drum portions of the motor of Comparative Example 3 is formed such that its width T1 satisfies the following equation (5). T3 <T1…(5)

[0054] At this time, both axial ends of the insulating film 261 may overlap onto the lower insulator 24 and the upper insulator 25, respectively, as shown in Figure 16. A gap 101 may be formed between the multiple insulating films 26 and the multiple tooth portions 32 when both ends of the multiple insulating films 26 overlap onto the lower insulator 24 and the upper insulator 25, respectively. The space factor in the motor of Comparative Example 3 decreases due to the formation of the gap 101. The motor 5 of Example 1 described above can suppress the formation of such a gap 101, and can suppress the decrease in space factor compared to the motor of Comparative Example 3.

[0055] Figure 17 is a cross-sectional view showing the insulating film 261 attached to the stator core 23 of the motor of Comparative Example 4. Figure 18 is a longitudinal cross-sectional view showing the insulating film 261 when the multiple winding drum portions of the motor of Comparative Example 4 are attached to the stator core 23. In the motor of Comparative Example 4, the multiple winding drum portions 42 of the motor 5 of Example 1 described above are replaced with other multiple winding drum portions. Each of the multiple winding drum portions of the motor of Comparative Example 4 is formed such that its width T2 satisfies the following equation (6). T2 ≤ T3 …(6) In this case, the axial end faces of the multiple insulating films 26 may not face the right axial regulating surface 54 and the left axial regulating surface 64 of the multiple winding drum portions of the motor of Comparative Example 4, as shown in Figure 18. The motor of Comparative Example 4 may not be able to prevent the multiple insulating films 26 from shifting in the axial direction because the end faces 85 and 86 of the multiple insulating films 26 do not face the right axial regulating surface 54 and the left axial regulating surface 64. The motor 5 of Example 1 described above can position the end faces 85 and 86 of the multiple insulating films 26 to face the right axial regulating surface 54 and the left axial regulating surface 64, and can reliably prevent the multiple insulating films 26 from shifting in the axial direction compared to the motor of Comparative Example 4.

[0056] Figure 19 is a cross-sectional view showing an insulating film 261 attached to the stator core 23 of the motor of Comparative Example 5. Figure 20 is a longitudinal cross-sectional view showing a coil 89 wound around the teeth portion 321 of the motor of Comparative Example 5. In the motor of Comparative Example 5, the multiple winding drum portions 42 of the motor 5 of Example 1 described above are replaced with multiple other winding drum portions. Each of the multiple winding drum portions of the motor of Comparative Example 5 is formed such that its width T2 satisfies the following equation (7). T3 + t × 2 <T2…(7) In this case, as shown in Figure 20, the coil may not be in contact with the insulating film 261, and a gap 102 may be formed between the coil and the insulating film 261. The motor 5 of Example 1 described above can suppress the formation of such a gap 102, and can more reliably suppress the decrease in space factor compared to the motor of Comparative Example 5.

[0057] [Effects of Motor 5 in Example 1] The motor 5 of Embodiment 1 comprises a cylindrical stator 22 and a rotor 21 positioned inside the stator 22 and supported to be rotatable around a rotation axis 16. The stator 22 comprises a stator core 23, an upper insulator 25, a coil, and an insulating film 261. The stator core 23 comprises an annular yoke portion 31 and a tooth portion 321 projecting from the yoke portion 31 toward the rotation axis 16. The upper insulator 25 comprises a winding drum portion 421 along the tooth portion 321. The coil 89 is wound around the tooth portion 321 together with the winding drum portion 421. The insulating film 261 separates the tooth portion 321 from the coil 89. A right-side restricting portion (first restricting portion) 51 is formed along the parting line on the right side surface 45 of the circumferential end of the winding drum portion 421. The right-side restricting portion (first restricting portion) 51 ensures that the axial end face of the insulating film 261 faces the right-side restricting portion 51 and restricts the axial movement of the insulating film 261.

[0058] In this case, the motor 5 of Example 1 can prevent the insulating film 261 from being improperly attached to the stator core 23 even when burrs (protrusions) are formed along the parting line. In the motor 5 of Example 1, by properly attaching the insulating film 261 to the stator core 23, the dead space inside the slot 341 where the coil 89 is not placed can be reduced, and a decrease in the space factor can be suppressed. In the motor 5 of Example 1, because the decrease in space factor is suppressed, rotational power can be generated with high efficiency.

[0059] Furthermore, the right-side restricting portion (first restricting portion) 51 of the motor 5 in Embodiment 1 is positioned further axially from the teeth portion 321 than the upper end surface 28 of the teeth portion 321 in the axial direction. In this case, the motor 5 in Embodiment 1 can reliably prevent electrical contact between the teeth and the coil 89 by positioning the insulating film 261 so that its end surface contacts the right-side restricting portion (first restricting portion) 51.

[0060] Furthermore, the motor 5 of Example 1 is formed such that it satisfies the following equation (8) using the distance L1 from the end face of the tooth portion 321 in the axial direction to the right-side restricting portion (first restricting portion) 51, the length L2 of the tooth portion 321 in the axial direction, and the length L3 of the insulating film 261 in the axial direction. L2 ≤ L3 ≤ L2 + L1 × 2 …(8) In this case, the motor 5 of Embodiment 1 can prevent a portion of the side surface of the tooth portion 321 facing the slot 341 from being left uncovered by the insulating film 261, thereby reliably preventing electrical contact between the tooth portion 321 and the coil 89. Furthermore, the motor 5 of Embodiment 1 can prevent the insulating film 261 from riding up onto the right-side restricting portion (first restricting portion) 51, thereby reducing the dead space inside the slot 341 where the coil 89 is not located, and suppressing a decrease in the space utilization ratio.

[0061] Furthermore, in the motor 5 of Embodiment 1, a right-side recess 52 is formed in the region of the right side surface 45 of the motor 5 that is closer to the teeth portion 321 than the right-side restricting portion (first restricting portion) 51, and is recessed in the width direction 67 perpendicular to the longitudinal direction 68 of the winding drum portion 421 when viewed from the axial direction. In this case, the motor 5 of Embodiment 1 can securely hold the insulating film 261 in a state in which the insulating film 261 is properly attached to the stator core 23 by having the end of the insulating film 261 fit into the right-side recess 52. In addition, the motor 5 of Embodiment 1 can reduce the dead space inside the slot 341 where the coil 89 is not placed by having the end of the insulating film 261 fit into the right-side recess 52, thereby suppressing a decrease in the space factor.

[0062] Furthermore, the upper insulator 25 of the motor 5 in Embodiment 1 is formed such that it satisfies the following equation (9) using the width T1 between the right recess 52 and the left recess 62 in the width direction 67, the width T2 of the winding drum portion 421 in the width direction 67, the width T3 of the teeth portion 321 in the width direction 67, and the thickness t of the insulating film 261. T1 ≤ T3 <T2≦T3+t×2…(9) In this case, the motor 5 of Embodiment 1 can prevent the insulating film 261 from separating from the teeth portion 321 when the insulating film 261 contacts the right circumferential restricting surface 55 of the right recess 52 of the winding drum portion 421, thereby suppressing a decrease in the space factor. Furthermore, the motor 5 of Embodiment 1 can prevent the end face of the insulating film 261 from no longer facing the right restricting portion (first restricting portion) 51, thereby reliably preventing the insulating film 261 from moving in the axial direction. Furthermore, the motor 5 of Embodiment 1 can prevent a gap from forming between the coil 89 and the insulating film 261, thereby suppressing a decrease in the space factor.

[0063] Furthermore, the upper insulator 25 of the motor 5 in Embodiment 1 further includes an outer peripheral wall portion 41 along the yoke portion 31. On the inner peripheral surface 43 of the outer peripheral wall portion 41 facing the rotation axis 16, a plurality of second restricting portions 71 are formed on the side further axially from the yoke portion 31 than the upper end surface 28, which restrict the radial movement of the insulating film 261 perpendicular to the rotation axis 16, facing the insulating film 261. In this case, because a part of the outer peripheral wall portion 41 of the motor 5 in Embodiment 1 is not located inside the slot 341, the dead space inside the slot 341 where the coil 89 is not located can be reduced, and a decrease in the space utilization rate can be suppressed.

[0064] By the way, in the above-described embodiment 1, each of the multiple winding drum portions 42 of the motor 5 upper insulator 25 has a right-side recess 52 and a left-side recess 62 formed therein, but the right-side recess 52 and the left-side recess 62 do not necessarily have to be formed. [Examples]

[0065] Figure 21 is a perspective view showing the insulator 91 of the motor in Embodiment 2. The motor in Embodiment 2 is modified so that the lower insulator 24 and upper insulator 25 of the motor 5 in Embodiment 1 described above are replaced with other insulators 91. The insulator 91 is modified so that the multiple winding drum portions 42 of the upper insulator 25 described above are replaced with other multiple winding drum portions, and the parts of the insulator 91 that differ from the multiple winding drum portions are the same as the parts that differ from the multiple winding drum portions 42 of the upper insulator 25 described above.

[0066] Figure 22 is another perspective view showing the insulator 91 of the motor in Embodiment 2. The winding drum portion 92 of the motor in Embodiment 2 is formed in a generally columnar shape, similar to the winding drum portion 421 described above, and is integrally formed with the outer peripheral wall portion 41, protruding from the inner peripheral surface 43 of the outer peripheral wall portion 41 toward the rotation axis 16.

[0067] Figure 23 is a cross-sectional view showing the winding drum portion 92 of the motor of Embodiment 2. Similar to the winding drum portion 421 described above, the winding drum portion 92 has a right side surface 45 and a left side surface 46. The right side surface 45 has a right regulating portion 93 (first regulating portion) and a right circumferential regulating surface 94. The right regulating portion 93 is formed from a projection protruding from the right side surface 45 and is formed along the parting line plane 53. The right circumferential regulating surface 94 is formed between the right regulating portion 93 and the mounting surface 44 of the right side surface 45 and is formed along the plane 47.

[0068] The left side surface 46 has a left-side restricting portion 95 (first restricting portion) and a left-side circumferential restricting surface 96. The left-side restricting portion 95 is formed from a projection protruding from the left side surface 46 and is formed along the parting line plane 53. The left-side circumferential restricting surface 96 is formed between the left-side restricting portion 95 and the mounting surface 44 on the left side surface 46 and is formed along the plane 48.

[0069] The motor of Example 2, like the motor 5 of Example 1 described above, can prevent the multiple insulating films 26 from being positioned incorrectly even when burrs (protrusions) are formed along the parting line, by preventing the burrs (protrusions) from restricting the axial movement of the multiple insulating films 26. Because the motor of Example 2 prevents the multiple insulating films 26 from being positioned incorrectly, it can prevent an increase in dead space and suppress a decrease in the space utilization ratio, similar to the motor 5 of Example 1 described above.

[0070] By the way, the insulating film 261 of the motor in the embodiment described above is formed so as to satisfy the previously described formula (1), but it may also be formed so as to further satisfy the following formula (10). L2 + L1 ≤ L3 ... (10) Even when equation (10) is satisfied, and the end face 85 or end face 86 is in contact with the right axial restricting surface 54 or the left axial restricting surface 64, the motor can cover the surfaces of the stator core 23 facing multiple slots 34 with multiple insulating films 26, thereby more reliably preventing the stator core 23 from making electrical contact with multiple coils.

[0071] Although examples have been described above, the examples are not limited to those described above. Furthermore, the components described above include those that can be easily imagined by a person skilled in the art, those that are substantially the same, and those that fall within the so-called equivalent range. Moreover, the components described above can be combined as appropriate. Furthermore, at least one of various omissions, substitutions, and modifications of the components can be made without departing from the gist of the examples. [Explanation of symbols]

[0072] 5: Motor 16: Rotation axis 21: Rotor 22: Status 23: Stator core 24: Lower insulator 25: Upper insulator 26: Multiple insulating films 27: Lower end surface 28: Upper end surface 31: Yoke section 32: Multiple teeth 33: Inner surface 41:Outer wall part 42: Multiple winding drum sections 43: Inner surface 45:Right side 46: Left side 51: Right-side control section (first control section) 52: Right-side recess 53: Parting line plane 61: Left-side control section (first control section) 62: Left side recess 67: Width direction 68: Longitudinal direction 71: Second Regulatory Section 85: End face 86: End face 89: Coil 91: Insulator 92: Winding trunk part 93: Right-side regulatory section (first regulatory section) 95: Left-side control section (first control section)

Claims

1. A stator formed in a cylindrical shape, The stator is positioned inside the rotor and is supported so as to be rotatable around the axis of rotation, The stator is, A stator core comprising a yoke portion formed in an annular shape and a teeth portion protruding from the yoke portion toward the axis of rotation, An insulator having a winding drum portion along the aforementioned teeth portion, The coil wound around the teeth portion together with the winding drum portion, It has an insulating film that separates the teeth portion and the coil, On the side surfaces of both ends of the winding drum portion in the circumferential direction around the rotation axis, a first restricting portion is formed along the parting line formed in the insulator. The first restricting portion is configured such that the end faces of the insulating film face each other in the axial direction parallel to the rotation axis, and restricts the movement of the insulating film in the axial direction. Motor.

2. The first restricting portion is positioned on the side further in the axial direction from the teeth portion than the end face of the teeth portion in the axial direction. The motor according to claim 1.

3. Using the distance L1 from the end face of the teeth portion to the first restricting portion in the axial direction, the length L2 of the teeth portion in the axial direction, and the length L3 of the insulating film in the axial direction, the following formula is used: L2 ≤ L3 ≤ L2 + L1 × 2 Formed to satisfy The motor according to claim 2.

4. In the axial direction, a recess is further formed in the region of the side surface that is closer to the teeth portion than the first restricting portion, so as viewed from the axial direction, the recess is recessed in the width direction perpendicular to the longitudinal direction of the winding drum portion. The motor according to claim 2.

5. The insulator is calculated using the width T1 between the recesses in the width direction, the width T2 of the winding drum portion in the width direction, the width T3 of the teeth portion in the width direction, and the thickness t of the insulating film, as follows: T1 ≤ T3 < T2 ≤ T3 + t × 2 Formed to satisfy The motor according to claim 4.

6. The insulator further comprises an outer peripheral wall portion along the yoke portion, On the inner circumferential surface of the outer circumferential wall portion facing the rotation axis, a second restricting portion is formed on the side further axially from the yoke portion than the end face of the yoke portion in the axial direction, which restricts the movement of the insulating film in the radial direction perpendicular to the rotation axis, facing the insulating film. The motor according to claim 1.

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