WO2019039143A1

WO2019039143A1 - Stator, motor provided with stator, compressor provided with motor, and air conditioner provided with compressor

Info

Publication number: WO2019039143A1
Application number: PCT/JP2018/027049
Authority: WO
Inventors: 明宣石嵜
Original assignee: ダイキン工業株式会社
Priority date: 2017-08-22
Filing date: 2018-07-19
Publication date: 2019-02-28
Also published as: CN111033953B; CN111033953A; JP2019041444A; JP6489175B2

Abstract

In the present invention, an insulating member disposed between a coil 55 and a plurality of tooth parts 53 of a stator core 51 of a stator 50 comprises a first insulating sheet 60B and a second insulating sheet 60C which cover a slot 56. The number of folds in the second insulating sheet 60C is less than the number of folds in the first insulating sheet 60B, and the second insulating sheet 60C is bent into a shape which, in a plan view of the stator 50, conforms more closely to the shape of the section on a back yoke 52 side than to the shapes of tips of the tooth parts 53 in the slot 56.

Description

Stator, motor including the stator, compressor including the motor, and air conditioner including the compressor

The present invention relates to a stator, a motor including the stator, a compressor including the motor, and an air conditioner including the compressor.

In a compressor motor provided in an outdoor unit of an air conditioner, an insulating member for insulating between a stator core made of electromagnetic steel sheet and a coil is disposed between the stator core and the coil. The insulating member is inserted into the slot of the stator core and has an insulating sheet covering the side of the teeth of the stator core. In such an insulating sheet, in order to increase the insulation distance between the tooth portion and the coil, a plurality of insulating sheets may be inserted into the slot in a state of being superposed (see, for example, Patent Documents 1 and 2). ).

JP, 2014-50290, A Unexamined-Japanese-Patent No. 2010-115040

By the way, when inserting an insulation sheet in a slot part, in order to secure the ease of insertion, it is necessary to bend an insulation sheet in the shape same as the shape of a slot part beforehand. However, when the shape of the insulating sheet is complicated, the number of times of bending of the insulating sheet is increased, and the production equipment for manufacturing the insulating sheet is complicated accordingly.

The present invention has been made in view of such circumstances, and it is a stator easy to simplify production equipment, a motor including the stator, a compressor including the motor, and an air conditioner including the compressor. Intended to provide.

A stator for solving this problem is formed by winding a wire around a stator core having an annular back yoke and a plurality of teeth extending radially from the back yoke and the plurality of teeth. A stator comprising: a coil; and an insulating member disposed between the plurality of teeth and the coil and electrically insulating the stator core from the coil, wherein the plurality of insulating members are provided. In the side face of the portion of the stator core that constitutes the slot portion formed by the back-yoke including the teeth adjacent to each other in the circumferential direction, including the insulating sheet, the plurality of insulating sheets And the plurality of insulating sheets are inserted into the slot in a bent state and in a state of being superimposed on each other, and the plurality of insulating sheets are The first insulating sheet of the first bending number and the second insulating sheet of the bending number smaller than the first bending number, the second insulating sheet being in the slot portion in a plan view of the stator It is bent in the shape according to the shape of the part by the side of the back yoke rather than the tip of the tooth part.

According to this configuration, direct contact between the coil and the tooth portion between the entire tooth portion and the coil can be suppressed by the first insulating sheet. The number of bending of the second insulating sheet is smaller than the number of bending of the first insulating sheet, and the second insulating sheet is bent to a shape conforming to the shape of the portion closer to the back yoke than the tip of the tooth portion. The structure of the part which manufactures a 2nd insulation sheet in the production equipment which manufactures an insulation sheet and a 2nd insulation sheet can be simplified.

In the stator, the teeth portion has a wide portion that expands in the circumferential direction at its tip, and the first insulating sheet covers the wide portion and extends toward the teeth adjacent in the circumferential direction. Is preferred.

According to the above configuration, since the first insulating sheet covers the wide portion and extends toward the teeth adjacent in the circumferential direction, the insulation distance between the coil and the teeth can be increased. Therefore, the dielectric strength can be improved.

In the stator, the insulating member has a cover member that covers both axial end faces of the tooth portion, and the cover member is a tip cover portion that covers at least a part of the tip of the tooth portion and the wide portion. It is preferable that the distal end cover portion protrudes from the wide portion toward the back yoke, and the coil is in contact with the distal end cover portion in the radial direction.

According to this configuration, the shortest distance between the coil at the tip of the tooth portion and the wide portion of the tooth portion is longer than the shortest distance between the coil and the tooth portion in the other portion of the tooth portion. Therefore, the leakage current between the coil and the stator core can be reduced.

In the stator, the first insulating sheet is disposed on the coil side, the second insulating sheet is disposed on the tooth portion side, and the thickness of the second insulating sheet is that of the first insulating sheet. It is preferable to be thinner than the thickness.

According to this configuration, the first insulating sheet on the side of the thick coil can press the second insulating sheet on the side of the thin tooth portion against the side surface of the tooth portion. The sheet can be placed along the side of the teeth. Therefore, when winding a conducting wire to a teeth part by a winding machine, it can control that a nozzle of a winding machine contacts a 1st insulating sheet.

In the stator, the insulating member has a cover member that covers both axial end surfaces of the tooth portion, and an axial direction of the insulating sheet disposed closest to the tooth portion among the plurality of insulating sheets. Preferably, the length of the sheet is shorter than the axial length of the other insulating sheets.

In the case where the cover members are attached to both axial end faces of the teeth after the plurality of insulation sheets are inserted into the slot, the insulation sheet closest to the teeth of the plurality of insulation sheets contacts the cover. There is a high possibility of doing. When the insulating sheet closest to the teeth portion contacts the cover member, the insulating sheet may be bent and sandwiched between the cover member and the axial end face of the teeth portion.

In that respect, according to the above configuration, since the axial length of the insulating sheet closest to the teeth of the plurality of insulating sheets is shorter than the axial length of the other insulating sheets, the cover member has the teeth In the case of being attached to both axial end faces, the insulation sheet on the teeth side is in contact with the cover member and the insulation sheet is bent and may be sandwiched between the cover member and the axial end face of the tooth part Becomes lower.

In the stator, the second insulating sheet is disposed closest to the teeth portion, and an axial length of the first insulating sheet is longer than an axial length of the teeth portion, and the second insulating sheet is provided. The axial length of the sheet is preferably shorter than the axial length of the first insulating sheet.

According to this configuration, the second insulating sheet protrudes in the axial direction from the axial end face of the tooth portion as compared to the case where the axial length of the first insulating sheet and the axial length of the second insulating sheet are equal to each other. The length of doing Therefore, the second insulating sheet is less likely to be sandwiched between the end face in the axial direction of the teeth portion and the cover member.

In the stator, the axial length of the second insulating sheet is preferably equal to the axial length of the teeth.
According to this configuration, the second insulating sheet protrudes in the axial direction from the axial end face of the tooth portion as compared to the case where the axial length of the first insulating sheet and the axial length of the second insulating sheet are equal to each other. The second insulating sheet does not project from the axial end face of the teeth. Therefore, the second insulating sheet is more difficult to be sandwiched between the end face in the axial direction of the tooth portion and the cover member.
In the stator, it is preferable that the length of the first insulating sheet be longer than the length of the second insulating sheet in the circumferential direction of the slot portion.
In the stator, it is preferable that the first insulating sheet is disposed on the tip end side of the teeth portion and has a tip portion folded back to the back yoke side.

A motor which solves the above-mentioned subject is provided with the above-mentioned stator and a rotor which counters with the above-mentioned stator in the above-mentioned diameter direction, and is rotated by the magnetic field which the above-mentioned stator forms.
According to this configuration, the same effect as that of the stator can be obtained.

The compressor which solves the above-mentioned subject is provided with the above-mentioned motor and the compression mechanism which drives with the above-mentioned motor.
According to this configuration, the same effect as that of the motor can be obtained.

An air conditioner that solves the above problems includes the above-described compressor.
According to this configuration, the same effect as that of the compressor can be obtained.

According to the stator, a motor including the stator, a compressor including the motor, and an air conditioner including the compressor, production facilities can be simplified.

BRIEF DESCRIPTION OF THE DRAWINGS The block diagram which shows the air conditioner of this embodiment notionally. The longitudinal cross-sectional view of the compressor of an air conditioner. Sectional drawing of the 3-3 line of FIG. The disassembled perspective view of the stator core and the 1st insulation sheet and the 2nd insulation sheet in the stator of the motor of a compressor. Flat section view of a stator. The top view of a 1st insulation sheet. The top view of a 2nd insulation sheet. The longitudinal cross-sectional view of the teeth part in the state where the insulating member was attached to the stator core, and its surroundings. (A) is a top view of a stator, (b) is an enlarged view of the dashed-dotted-line circle of (a). The schematic diagram of the production equipment which manufactures a 1st insulation sheet and a 2nd insulation sheet. The flat cross section of the stator of a modification. The flat cross section of the stator of another modification.

As shown in FIG. 1, in the air conditioner 1, a compressor 10, a four-way switching valve 2, an outdoor heat exchanger 3, an expansion valve 4, and an indoor heat exchanger 5 are annularly connected by a pipe 6. This is a heat pump type air conditioner in which the refrigerant is reversibly circulated by switching the four-way switching valve 2.

That is, the air conditioner 1 switches the four-way switching valve 2 to the cooling mode connection state (the state shown by the solid line in the drawing), whereby the compressor 10, the four-way switching valve 2, the outdoor heat exchanger 3, the expansion valve 4, A cooling cycle is formed in which the refrigerant is circulated in the order of the indoor heat exchanger 5, the four-way switching valve 2, and the compressor 10. Thus, the air conditioner 1 performs the cooling operation in which the outdoor heat exchanger 3 is a condenser and the indoor heat exchanger 5 is an evaporator. In addition, the air conditioner 1 switches the four-way switching valve 2 to the heating mode connection state (the state shown by the broken line), whereby the compressor 10, the four-way switching valve 2, the indoor heat exchanger 5, the expansion valve 4, the chamber A heating cycle is formed in which the refrigerant is circulated in the order of the outer heat exchanger 3, the four-way switching valve 2, and the compressor 10. As a result, the air conditioner 1 performs the heating operation in which the indoor heat exchanger 5 is used as a condenser and the outdoor heat exchanger 3 is used as an evaporator.

As shown in FIGS. 2 and 3, the compressor 10 is a rocking piston type compressor, and includes a compression mechanism 20, a motor 30, and a crankshaft 11 for transmitting the driving force of the motor 30 to the compression mechanism 20. , A housing 12 accommodating the compression mechanism 20, the motor 30, and the crankshaft 11, and an accumulator 13 for separating the refrigerant into gas and liquid. The accumulator 13 is disposed laterally of the housing 12 and connected to the housing 12 by a suction pipe 14. The motor 30 is disposed at the top of the housing 12 and the compression mechanism 20 is disposed at the bottom of the housing 12 in the direction in which the crankshaft 11 extends (hereinafter simply referred to as “axial direction”). A reservoir 16 in which the lubricating oil is accumulated is formed in the housing 12 below the compression mechanism 20. At the upper end of the housing 12, a discharge pipe 15 for discharging a refrigerant is provided. The discharge pipe 15 is connected to the pipe 6 (see FIG. 1).

The compression mechanism 20 includes a cylinder 21 attached to the housing 12, a roller piston 22 accommodated in a cylinder chamber 21a of the cylinder 21, a front head 23 and a rear head 24 which cover both sides of the cylinder chamber 21a in the axial direction, and a refrigerant And a muffler 25 for reducing the flow noise. The muffler 25 is attached to the front head 23.

As shown in FIG. 3, the cylinder 21 has a blade accommodation chamber 21 b having a shape in which two circles are arranged in a plan view, an intake port 21 c communicating the intake pipe 14 and the cylinder chamber 21 a, a cylinder chamber 21 a and a blade. And a discharge port 21d formed in the vicinity of the storage chamber 21b. The cylinder chamber 21a has a circular shape in plan view. The cylinder chamber 21a and the blade accommodation chamber 21b communicate with each other. A swing bush 26 is slidably attached to a portion of the blade accommodation chamber 21b on the cylinder chamber 21a side. A discharge valve 27 (see FIG. 2) is attached to the discharge port 21d. An example of the discharge valve 27 is a reed valve.

The roller piston 22 has a configuration in which a substantially cylindrical roller portion 22a and a rod-like blade portion 22b are formed integrally and indivisiblely. The eccentric portion 11a of the crankshaft 11 is slidably fitted on the roller portion 22a. The blade portion 22 b is slidably fitted to the rocking bush 26. The cylinder chamber 21 a is divided by the roller piston 22 into a compression chamber HR on the discharge port 21 d side and a suction chamber LR on the suction port 21 c side. The center CA of the roller portion 22a is at the same position as the center CB of the eccentric portion 11a, and is different from the center CC of the cylinder chamber 21a. The center CC of the cylinder chamber 21 a is at the same position as the rotation center of the crankshaft 11. The rotation of the crankshaft 11 by the motor 30 causes the blade portion 22b to rock and the roller portion 22a to revolve, whereby the refrigerant is sucked from the suction port 21c into the suction chamber LR and compressed in the compression chamber HR. Then, the compressed high-pressure refrigerant is discharged into the muffler 25 through the discharge port 21d. Since the space in the muffler 25 is sufficiently larger than the opening of the discharge port 21 d, the noise of the refrigerant discharged into the muffler 25 is reduced.

As shown in FIG. 2, the motor 30 is an inner rotor type three-phase brushless motor, and includes a rotor 40 and a stator 50.
The rotor 40 is a magnet embedded rotor, and includes a rotor core 41 fixed to the crankshaft 11 and a plurality of plate-like permanent magnets 42. The rotor core 41 is formed by laminating thin electromagnetic steel plates in the axial direction. The permanent magnet 42 is embedded in the rotor core 41. The shape of the permanent magnet 42 can be set arbitrarily. In one example, the permanent magnet 42 is flat.

As shown in FIGS. 2 and 4, the stator 50 has a stator core 51 in which thin electromagnetic steel plates are laminated in the axial direction. The stator core 51 is fixed to the housing 12 by, for example, shrink fitting. The stator core 51 has an annular back yoke 52 and a plurality of teeth portions 53 extending radially inward from the back yoke 52. Further, the stator core 51 has a slot 56 which is a portion surrounded by the teeth 53 adjacent to each other in the circumferential direction and the back yoke 52 connecting the teeth 53. At the tip of the teeth portion 53, a wide portion 53a extending in the circumferential direction is formed. The wide portion 53a has a shape that tapers toward the circumferential tip in a plan view.

The stator 50 further includes a coil 55 formed by so-called concentrated winding in which a conducting wire 54 is wound around each tooth portion 53, and an insulating member 60 disposed between the stator core 51 and the coil 55. .

The insulating member 60 includes a pair of cover members 60A (see FIG. 2) covering both axial end faces of the stator core 51, and a first insulating sheet 60B covering the inner side surface of the back yoke 52 and the circumferential side surface of the teeth portion 53. And a second insulating sheet 60C (see FIG. 4).

The detailed configuration of the insulating member 60 will be described with reference to FIGS. 4 to 9. In FIG. 4 to FIG. 9, the first insulating sheet 60B is separated from the second insulating sheet 60C and the second insulating sheet 60C is separated from the stator core 51 for convenience of explanation, but in practice the first insulating sheet 60B is The second insulating sheet 60C is in contact with the stator core 51.

As shown in FIGS. 4 and 5, the first insulating sheet 60 B and the second insulating sheet 60 C are inserted into the respective slot portions 56 of the stator core 51 in a state of being superimposed on each other. The first insulating sheet 60B is disposed on the coil 55 side, and the second insulating sheet 60C is disposed on the stator core 51 side. As shown in FIG. 5, the second insulating sheet 60 C is disposed closest to the teeth portion 53 among the plurality of insulating sheets. The thickness of the first insulating sheet 60B is thicker than that of the second insulating sheet 60C. In one example, the thickness of the first insulating sheet 60B is twice or more the thickness of the second insulating sheet 60C. More specifically, the thickness of the first insulating sheet 60B is at least twice and at most 3 times the thickness of the second insulating sheet 60C. The first insulating sheet 60B and the second insulating sheet 60C are formed of a resin material such as polyethylene terephthalate (PET).

As shown in FIGS. 4 and 5, the shape of the first insulating sheet 60B and the shape of the second insulating sheet 60C in plan view are different from each other. Specifically, the first insulating sheet 60 B covers the side surface of the back yoke 52 from the side surface of the back yoke 52 in the slot portion 56 to the side surface in the circumferential direction of the wide portion 53 a which is the tip of the tooth portion 53. The second insulating sheet 60 C covers the side surface in the circumferential direction of the slot portion 56 from the side surface of the back yoke 52 to the portion closer to the back yoke 52 than the tip end of the teeth portion 53. That is, the second insulating sheet 60C does not cover the side surface in the circumferential direction of the wide portion 53a which is the tip of the tooth portion 53.

More specifically, as shown in FIGS. 5 and 6, the first insulating sheet 60B includes a pair of tooth cover portions 64A covering side surfaces facing in the circumferential direction in the teeth portions 53 adjacent in the circumferential direction, and It has back yoke cover part 65A which covers the inner side of back yoke 52 which ties adjacent teeth part 53 in the peripheral direction, and tip cover part 66 which covers the side surface of the tip of teeth part 53 in the circumferential direction. The first insulating sheet 60B further includes an extending portion 67 which is bent radially outward from the tip end cover portion 66 and extends in the circumferential direction. The first insulating sheet 60B is formed by bending a sheet-like base material with a press die so that the pair of teeth cover portions 64A, the back yoke cover portions 65A, the pair of tip end cover portions 66, and the pair of extension portions It is integrally formed. As shown in FIG. 6, the first insulating sheet 60B has six folds FA1 to FA6. The folds FA1 and FA2 are formed by bending the pair of teeth cover portions 64A with respect to the back yoke cover portion 65A. The folds FA3 and FA4 are formed by bending the distal end cover portion 66 with respect to each tooth cover portion 64A. The folds FA 5 and FA 6 are formed by bending the extension portion 67 with respect to each tip end cover portion 66.

As shown in FIGS. 5 and 7, the second insulating sheet 60C has a substantially U shape in a plan view. The second insulating sheet 60C includes a pair of teeth cover portions 64B covering side surfaces facing in the circumferential direction in the teeth portions 53 adjacent in the circumferential direction, and an inside of the back yoke 52 connecting the teeth portions 53 adjacent in the circumferential direction in the circumferential direction. And a back yoke cover portion 65B covering the side surface. In the second insulating sheet 60C, the pair of tooth cover portions 64B and the back yoke cover portion 65B are integrally formed by bending a sheet-like base material with a press die. As shown in FIG. 5, the pair of teeth cover portions 64B do not cover the tips (wide portions 53a) of the teeth portions 53, that is, the teeth cover portions 64B are radially outer than the wide portions 53a in the teeth portions 53 (back yoke 52) is covered. As shown in FIG. 7, the second insulating sheet 60C has two folds FB1 and FB2. That is, the number of bending of the second insulating sheet 60C is smaller than the number of bending of the first insulating sheet 60B. The folds FB1 and FB2 are formed by bending the pair of teeth cover portions 64B with respect to the back yoke cover portion 65B.

As shown in FIG. 8, the length L1 of the first insulating sheet 60B is longer than the length L3 of the stator core 51 (L1> L3). The axial length L2 of the second insulating sheet 60C is shorter than the axial length L1 of the first insulating sheet 60B (L1> L2). The axial length L2 of the second insulating sheet 60C is preferably equal to the axial length L3 of the stator core 51 (the teeth 53) (L2 = L3). More preferably, both axial end surfaces of the second insulating sheet 60C are flush with the axial end surfaces of the stator core 51 (the teeth 53).

As shown in FIG. 9A, the cover member 60A is made of a resin material, and has an annular back yoke cover 61 covering the back yoke 52, and a linear teeth cover 62 covering the teeth 53. . The back yoke cover 61 and the teeth cover 62 are integrally formed. The tooth cover portion 62 extends radially inward from the back yoke cover portion 61. The circumferential width dimension of the teeth cover portion 62 is equal to the circumferential width dimension of the teeth portion 53. In the teeth cover portion 62, a tip cover portion 63 is provided at the tip of the teeth cover portion 62, that is, the portion covering the tip of each tooth portion 53. The front end cover portion 63 extends in the axial direction from the tooth cover portion 62. That is, the distal end cover portion 63 covers the distal end of the tooth portion 53 and at least a part of the wide portion 53 a in the axial direction. The distal end cover portion 63 of the present embodiment covers the teeth portion 53 to a portion slightly radially outward of the distal end edge of the tooth portion 53. The shape of the distal end cover portion 63 is different from the shape of the distal end (wide portion 53 a) of the tooth portion 53.

As shown in FIG. 9B, a groove 63a into which the first insulating sheet 60B is inserted is formed on the back surface side of the front end cover portion 63 of the cover member 60A. The axial position of the first insulating sheet 60B is determined by the grooves 63a. Further, in order to suppress the strength reduction of the tip cover portion 63 due to the groove 63a, the width of the tip cover portion 63 in the radial direction increases toward the tip of the tip cover portion 63 in the circumferential direction. Thus, the tip end cover portion 63 extends outward in the radial direction (back yoke 52 side) of the wide portion 53 a of the tooth portion 53. The conducting wire 54 constituting the coil 55 is in contact with the radially outer surface of the distal end cover portion 63. For this reason, the conducting wire 54 which comprises the coil 55 does not exist in the wide part 53a side rather than the tip cover part 63. As shown in FIG. That is, a space S wider than the space between the leading end cover portion 66 of the first insulating sheet 60B and the wide portion 53a of the tooth portion 53 is formed between the conducting wire 54 and the wide portion 53a.

As described above, when compared with the shortest distance between the conducting wire 54 and the wide portion 53 a of the tooth portion 53 when the conducting wire 54 is in contact with the front end cover portion 66 of the first insulating sheet 60 B, the conducting wire 54 (coil 55) and the shortest distance between the wide portion 53a of the tooth portion 53 is increased. As a result, the capacitance of the capacitor between the conductor 54 and the wide portion 53a is reduced. Therefore, since the leakage current is reduced in the wide portion 53 a of the tooth portion 53, it is possible to suppress the leakage current from flowing into the wide portion 53 a of the tooth portion 53 even with only one first insulating sheet 60 B.

The method of manufacturing the stator 50 and the operation of this embodiment will be described with reference to FIG. In the following description, the first comparison stator is a stator using a second insulating sheet having a tip cover portion 66 and an extending portion 67 as in the shape of the first insulating sheet 60B. The second comparative stator has an axial length equal to the axial length L1 of the first insulating sheet 60B, and has the same shape as the second insulating sheet 60C of the present embodiment in plan view. It is a stator in which the 2nd insulating sheet was used.

In the present embodiment, after each of the first insulating sheet 60B and the second insulating sheet 60C is formed by the production facility 100, the first insulating sheet 60B and the second insulating sheet 60C are inserted into the respective slot portions 56 of the stator core 51 in a superimposed state 4). As shown in FIG. 10, the production facility 100 includes a first forming portion 110 for forming the first insulating sheet 60B, a second forming portion 120 for forming the second insulating sheet 60C, and a first insulating sheet 60B. And an assembling portion 130 for overlapping the second insulating sheet 60C. One example of the first forming portion 110 and the second forming portion 120 form the first insulating sheet 60B and the second insulating sheet 60C by heat press molding.

In the first formation portion 110, the first insulating sheet 60B is formed through the following first to fifth steps. In the first step, the first base material DS1 is bent by being pressed by the first mold MA to form a pair of extension parts 67. In the second step, the first base material DS1 subjected to the first step is bent by being pressed with a second mold (not shown) to form one tip cover portion 66. In the third step, the first base material DS1 subjected to the second step is bent by pressing with a third mold (not shown) to form the other end cover portion 66. In the fourth step, the first base material DS1 subjected to the third step is bent by being pressed with a fourth die (not shown), and one teeth cover portion 64A is formed. Finally, in the fifth step, the first base material DS1 subjected to the fourth step is bent by being pressed with a fifth mold (not shown), and the other teeth cover portion 64A and back yoke cover portion 65A are folded. It is formed. In the first formation portion 110, after the first step, the fourth step of forming one teeth cover portion 64A, and the fifth step of forming the other teeth cover portion 64A and the back yoke cover portion 65A are sequentially performed. Thereafter, a second step of forming one tip cover portion 66 and a third step of forming the other tip cover portion 66 may be performed.

In the second formation portion 120, the second base material DS2 is bent by being pressed by the mold MB, and a pair of tooth cover portions 64B and a back yoke cover portion 65B are formed. Thereby, the second insulating sheet 60C is formed.

In the assembling portion 130, the first insulating sheet 60B and the second insulating sheet 60C are overlapped by inserting the first insulating sheet 60B into the opening 68 formed by the tips of the pair of tooth cover portions 64B of the second insulating sheet 60C. It is adjusted. The stacked first insulating sheet 60B and the second insulating sheet 60C are inserted into the respective slot portions 56 (see FIG. 4) of the stator core 51.

Thereafter, the cover members 60A are attached to both axial end faces of the stator core 51, and the conducting wire 54 is wound around the teeth 53 by a winding machine (not shown) so that the coils 55 are wound. Are formed (see FIG. 9A).

By the way, in the method of manufacturing the first comparative stator, since the shape of the second insulating sheet is the same as the shape of the first insulating sheet 60B, a production facility for manufacturing the first comparative stator (hereinafter referred to as “ The second forming unit of the comparative production facility “) has the same configuration as the first forming unit 110. That is, the second formation portion of the comparative production facility includes five types of molds, and manufactures the second insulating sheet through the above-described first to fifth steps. On the other hand, the second insulating sheet 60C of the present embodiment is formed in one step of pressing with the mold MB and bending the second base material DS2. For this reason, the 2nd formation part 120 of production equipment 100 is provided with one type of metallic mold. As described above, in the production facility 100 of the present embodiment, the configuration of the second forming unit 120 is simplified as compared with the comparative production facility.

Further, in the method of manufacturing the second comparative stator, the axial length of the second insulating sheet (hereinafter, “second comparative insulating sheet”) of the second comparative stator is the axial length of the stator core 51 Since it is longer than L3, when attaching cover member 60A to stator core 51, a portion (hereinafter referred to as "projected portion") axially protruding from the axial end face of stator core 51 in the second comparison insulation sheet There is a possibility that the cover member 60A and the axial end face of the stator core 51 may be pinched. That is, when the cover member 60A bends the protruding portion of the second comparison insulation sheet toward the teeth portion 53, the second comparison insulation sheet protrudes between the cover member 60A and the axial end face of the stator core 51. There is a risk that the part will be pinched. In particular, since the thickness of the second comparative insulating sheet is thinner than the thickness of the first insulating sheet 60B, and the shape of the second comparative insulating sheet in a plan view is substantially U-shaped, the second comparative insulating sheet is The projecting portion of the sheet is in a state of being easily bent by the cover member 60A. As a result, the possibility that the projecting portion of the second comparison insulation sheet is sandwiched between the cover member 60A and the axial end face of the stator core 51 is increased. When the projecting portion of the second comparison insulation sheet is sandwiched between the cover member 60A and the axial end face of the stator core 51, the first insulation sheet 60B is folded along with the bending of the second comparison insulation sheet. The first insulating sheet 60 B is separated from the teeth portion 53 because the first insulating sheet 60 B is pushed in a direction away from the teeth portion 53. As a result, when the coil 55 is formed by the winding machine, the nozzle (not shown) of the winding machine may interfere with the tip cover portion 66 and the extension portion 67 of the first insulating sheet 60B. In addition, when the second comparison insulating sheet is sandwiched between the cover member 60A and the axial end face of the stator core 51, the cover member 60A may float from the axial end face of the stator core 51. is there.

In that respect, in the present embodiment, the axial length L2 of the second insulating sheet 60C is equal to the axial length L3 of the stator core 51. Therefore, the axial length of the portion of the second insulating sheet 60C that protrudes from the axial end face of the stator core 51 is shorter than the axial length of the protruding portion of the second comparison insulating sheet, or The second insulating sheet 60C does not protrude from the axial end face of the stator core 51. Therefore, the possibility of the second insulating sheet 60C being pinched by the end face in the axial direction of the stator core 51 and the cover member 60A is reduced.

According to the present embodiment, the following effects can be obtained.
(1) The insulating member 60 disposed between the coil 55 and the teeth portion 53 includes the first insulating sheet 60B and the second insulating sheet 60C. Thereby, the insulation between the coil 55 and the stator core 51 is secured by the first insulating sheet 60B, and the capacitor capacity between the coil 55 and the stator core 51 is reduced by the second insulating sheet 60C. Therefore, electrical insulation between the coil 55 and the stator core 51 is secured by the first insulating sheet 60B and the second insulating sheet 60C, and the leakage current between the coil 55 and the stator core 51 is reduced. There is.

And in such a 1st insulation sheet 60B and the 2nd insulation sheet 60C, the 2nd formation part 120 of production equipment 100 shown in Drawing 10 is formed by forming the 2nd insulation sheet 60C in a substantially U shape in plane view. As shown, the second insulating sheet 60C can be formed in one step of the mold MB. Therefore, the production facility 100 can be simplified.

(2) The first insulating sheet 60B covers the wide portion 53a which is the tip of the tooth portion 53, while the second insulating sheet 60C does not cover the wide portion 53a of the tooth 53. According to this configuration, insulation between the coil 55 and the stator core 51 in the wide portion 53a of the tooth portion 53 can be secured by the first insulating sheet 60B, and leakage current can be suppressed from flowing to the wide portion 53a.

(3) The first insulating sheet 60 B has an extension portion 67 extending to the tooth portion 53 adjacent in the circumferential direction to the wide portion 53 a of the tooth portion 53. Therefore, the insulation distance between the coil 55 and the teeth portion 53 can be increased. Therefore, the dielectric strength between coil 55 and stator core 51 can be improved.

(4) The distal end cover portion 63 of the cover member 60A is located radially outward of the wide portion 53a of the tooth portion 53. The coil 55 is in contact with the distal end cover 63. According to this configuration, the shortest distance between the coil 55 at the tip of the tooth portion 53 and the wide portion 53a of the tooth portion 53 is the shortest distance between the coil 55 and the tooth portion 53 in the other portion of the tooth portion 53. It will be longer than that. Therefore, the leakage current between the coil 55 and the stator core 51 can be further reduced.

(5) The thickness of the second insulating sheet 60C disposed on the tooth portion 53 side is thinner than the thickness of the first insulating sheet 60B disposed on the coil 55 side. According to this configuration, the first insulating sheet 60B on the side of the thick coil 55 can press the second insulating sheet 60C on the side of the thin tooth portion 53 against the side surface of the tooth 53, so The sheet 60 B and the second insulating sheet 60 C can be disposed along the side surfaces of the teeth portion 53. Therefore, when the conducting wire 54 is wound around the teeth portion 53 by the winding machine, the nozzle of the winding machine can be prevented from contacting the first insulating sheet 60B.

(6) The axial length L2 of the second insulating sheet 60C is shorter than the axial length L1 of the first insulating sheet 60B, which is longer than the axial length L3 of the teeth 53. According to this configuration, the second insulating sheet 60C has the axis of the tooth portion 53 in comparison with the case where the axial length L1 of the first insulating sheet 60B and the axial length L2 of the second insulating sheet 60C are equal to each other. The length projecting from the end face in the direction becomes short. Therefore, the second insulating sheet 60C is less likely to be sandwiched between the end face in the axial direction of the teeth portion 53 and the cover member 60A. As a result, the second insulating sheet 60C is suppressed from being bent by the cover member 60A, so that the second insulating sheet 60C is suppressed from pressing the first insulating sheet 60B in a direction away from the teeth portion 53. Therefore, when the nozzle of the winding machine revolves around the teeth portion 53, interference with the first insulating sheet 60B can be suppressed.

(7) The axial length L2 of the second insulating sheet 60C is equal to the axial length L3 of the teeth 53. According to this configuration, the length in which the second insulating sheet 60C protrudes in the axial direction from the end face in the axial direction of the teeth 53 becomes shorter, or the second insulating sheet 60C protrudes from the end face in the axial direction of the teeth 53 do not do. Therefore, the second insulating sheet 60C is more difficult to be sandwiched between the end face in the axial direction of the teeth 53 and the cover member 60A.

(8) The first insulating sheet 60B and the second insulating sheet 60C are superimposed by inserting the first insulating sheet 60B in the radial direction through the opening 68 of the second insulating sheet 60C. For this reason, the first insulating sheet 60B and the second insulating sheet 60C can be easily overlapped as compared with the case where the first insulating sheet 60B is axially inserted into the second insulating sheet 60C.

(Modification)
The description of the above embodiment is an example of a stator according to the present invention, a motor including the stator, a compressor including the motor, and a form that the air conditioner including the compressor may take, and the form thereof is limited. Not intended. The stator according to the present invention, the motor including the stator, the compressor including the motor, and the air conditioner including the compressor are not limited to the embodiments described above, for example, the modifications described below, and at least consistent with each other. Two variants may take a combined form.

In the above embodiment, after the cover member 60A is attached to one of the end surfaces of the stator core 51 in the axial direction, the first insulating sheet 60B and the second insulating sheet 60C are overlapped by the production facility 100. It may be inserted into each slot 56 in the closed state. In this case, after the first insulating sheet 60B and the second insulating sheet 60C are inserted into the respective slot portions 56, the cover member 60A is attached to the other of the axial end surfaces of the stator core 51.

In the embodiment, the axial length L1 of the first insulating sheet 60B and the axial length L2 of the second insulating sheet 60C can be arbitrarily changed. For example, the length L1 of the first insulating sheet 60B and the length L2 of the second insulating sheet 60C may be equal to each other. Further, for example, the axial length L2 of the second insulating sheet 60C may be shorter than the axial length L3 of the stator core 51.

In the above embodiment, each of the thickness of the first insulating sheet 60B and the thickness of the second insulating sheet 60C can be arbitrarily changed. For example, the thickness of the first insulating sheet 60B and the thickness of the second insulating sheet 60C may be equal to each other.

In the embodiment, the first insulating sheet 60B may be disposed on the tooth portion 53 side, and the second insulating sheet 60C may be disposed on the coil 55 side.
In the above embodiment, as in the case of the stator 50A shown in FIG. 11, if the insulation between the coil 55 and the teeth 53 is maintained, the first insulating sheet covering one side of the predetermined teeth 53X in the circumferential direction 60D and the second insulating sheet 60E, and the first insulating sheet 60F and the second insulating sheet 60G which cover one side surface of the tooth portion 53Y adjacent to the tooth portion 53X and which faces in the circumferential direction the tooth portion 53X It may be formed in

In the embodiment described above, the insulating member 60 may have three or more insulating sheets. As a stator 50B shown in FIG. 12 as an example, the insulating member 60 has a first insulating sheet 60B, a second insulating sheet 60C, and a third insulating sheet 60H. In the stator 50B, the third insulating sheet 60H is disposed between the first insulating sheet 60B and the second insulating sheet 60C. In the stator 50B shown in FIG. 12, the shape of the third insulating sheet 60H is equal to the shape of the first insulating sheet 60B. The thickness of the third insulating sheet 60H is equal to the thickness of the first insulating sheet 60B. The axial length of the third insulating sheet 60H is equal to the axial length L1 of the first insulating sheet 60B.

In the stator 50B shown in FIG. 12, the shape of the third insulating sheet 60H may be substantially U-shaped, which is the same as the shape of the second insulating sheet 60C. This can simplify the production facility.
In the stator 50B shown in FIG. 12, the thickness of the third insulating sheet 60H can be arbitrarily changed. In one example, the thickness of the third insulating sheet 60H may be equal to the thickness of the second insulating sheet 60C.

In the stator 50B shown in FIG. 12, the axial length of the third insulating sheet 60H can be arbitrarily changed. In one example, the axial length of the third insulating sheet 60H is equal to the axial length L2 of the second insulating sheet 60C.

In the embodiment described above, the wide portion 53 a may be omitted from the teeth portion 53. In this case, the front end cover 66 may be omitted from the first insulating sheet 60B. The first insulating sheet 60B in which the front end cover portion 66 is omitted is formed such that the tooth cover portion 64A and the extension portion 67 are continuous.

In the embodiment, the motor 30 may be a so-called outer rotor type motor in which the rotor core is disposed radially outside the stator core.
-Although the air conditioner 1 of the above-mentioned embodiment enabled operation of both cooling operation and heating operation, it is not restricted to this, even if air conditioner 1 enables operation only of either cooling operation and heating operation. Good.

In the above embodiment, the axial length of the insulating sheet closest to the teeth 53 of the plurality of insulating sheets is shorter than the axial length of at least one of the other insulating sheets. In the case, the shape of the insulating sheet closest to the teeth portion 53 may be a shape that covers the wide portion 53a of the teeth portion 53 as in the first insulating sheet 60B of FIG.

(Supplementary note)
Next, technical ideas that can be grasped from the above-described embodiment and the above-described modifications will be described.
(Supplementary Note 1)
A stator core (51) having an annular back yoke (52) and a plurality of teeth (53) radially extending from the back yoke (52); and a plurality of conductive wires (54) on the plurality of teeth (53) Is disposed between the plurality of teeth (53) and the coil (55), and the stator core (51) and the coil (55). A stator (50) having an insulating member (60) for electrically insulating the two, and the insulating member (60) is a cover member (60A) covering both axial end faces of the tooth portion (53) And the plurality of insulating sheets (60B, 60C) covering the side surface of the portion constituting the slot portion (56) in the stator core (51), and the plurality of insulating sheets (60B, 60C) Most of the above Scan section (53) of the deployed axial direction of the insulating sheet to the side length is shorter than the length of the at least one axial direction of the insulating sheet of the other insulating sheet, the stator.

In the case where the cover member is attached to the axial end face of the teeth after the plurality of insulation sheets are inserted into the slot, the insulation sheet closest to the teeth of the plurality of insulation sheets contacts the cover. Probability is high. When the insulating sheet closest to the teeth portion contacts the cover member, the insulating sheet may be bent and sandwiched between the cover member and the axial end face of the teeth portion. As a result, the insulation sheet closest to the tooth portion pushes the other insulation sheets away from the tooth portion. As a result, when the coil is formed by the winding machine, there is a possibility that the nozzle of the winding machine may interfere with the portion of the insulating sheet covering the tip of the tooth portion. In addition, when the insulation sheet on the tooth portion side is sandwiched between the cover member and the axial end face of the stator core, the cover member may float from the axial end face of the stator core.

DESCRIPTION OF SYMBOLS 1 Air conditioner 10 Compressor 20 Compression mechanism 30 Motor 40 Rotor 50 Stator 51 Stator core 52 Back yoke 53 Teeth part 53a Wide part 54 Conducted wire 55 Coil 56 Slot part 60 Insulating member 60A Cover member 60B 1st insulating sheet 60C Second Insulating Sheet 63 Tip Cover Part L1 Axial Length L2 of the First Insulating Sheet Axial Length of the Second Insulating Sheet L3 Axial Length of the Teeth Part

Claims

A stator core (51) having an annular back yoke (52) and a plurality of teeth (53) radially extending from the back yoke (52); and a plurality of conductive wires (54) on the plurality of teeth (53) Is disposed between the plurality of teeth (53) and the coil (55), and the stator core (51) and the coil (55). A stator (50) having an insulating member (60) for electrically insulating the
The insulating member (60) includes a plurality of insulating sheets (60B, 60C),
The side surface of the portion constituting the slot portion (56) in the stator core (51) is covered with the plurality of insulating sheets (60B, 60C),
The plurality of insulating sheets (60B, 60C) includes at least a first insulating sheet (60B) having a first number of bending and a second insulating sheet (60C) having a number of bending smaller than the first number of bending. Including
The first insulating sheet (60B) is bent in a shape along a shape of a portion from the back yoke to the tip of the teeth portion (53) in the slot portion (56) in a plan view of the stator (50) And
The second insulating sheet (60C) follows the shape of the portion closer to the back yoke (52) than the tip of the teeth portion (53) in the slot portion (56) in a plan view of the stator (50). The stator is bent into a square shape.
The teeth portion (53) has a wide portion (53a) that expands in the circumferential direction at its tip,
The stator according to claim 1, wherein the first insulating sheet (60B) covers the wide portion (53a) and extends toward teeth portions (53) adjacent in the circumferential direction.
The insulating member (60) has a cover member (60A) that covers both axial end faces of the tooth portion (53).
The cover member (60A) includes a tip cover portion (63) covering at least a part of the tip of the tooth portion (53) and the wide portion (53a),
The tip cover portion (63) protrudes from the wide portion (53a) toward the back yoke (52),
The stator according to claim 2, wherein the coil (55) is in contact with the tip end cover portion (63) in the radial direction.
The first insulating sheet (60B) is disposed on the coil (55) side,
The second insulating sheet (60C) is disposed on the tooth portion (53) side,
The stator according to any one of claims 1 to 3, wherein a thickness of the second insulating sheet (60C) is thinner than a thickness of the first insulating sheet (60B).
The insulating member (60) has a cover member (60A) that covers both axial end faces of the tooth portion (53).
The axial length of the insulating sheet disposed closest to the teeth portion (53) among the plurality of insulating sheets (60B, 60C) is shorter than the axial length of the other insulating sheets. The stator according to any one of 1 to 4.
The second insulating sheet (60C) is disposed closest to the teeth portion (53),
The axial length (L1) of the first insulating sheet (60B) is longer than the axial length (L3) of the tooth portion (53),
The stator according to claim 5, wherein an axial length (L2) of the second insulating sheet (60C) is shorter than an axial length (L1) of the first insulating sheet (60B).
The stator according to claim 6, wherein an axial length (L2) of the second insulating sheet (60C) is equal to an axial length (L3) of the tooth portion (53).
The length of the said 1st insulation sheet (60B) is longer than the length of the said 2nd insulation sheet (60C) in the circumferential direction of the said slot part (56) as described in any one of Claims 1-7. stator.
The first insulating sheet (60B) is disposed on the tip end side of the tooth portion (53), and has a tip portion folded back to the back yoke (52) side. Stator described in.
A stator (50) according to any one of the preceding claims.
A rotor (40) facing the stator (50) in the radial direction and rotated by a magnetic field formed by the stator (50).
A motor (30) according to claim 10,
And a compression mechanism (20) driven by the motor (30).
An air conditioner comprising the compressor (10) according to claim 11.