JP2023044187A - Electric motor and hermetic electric compressor comprising the electric motor - Google Patents

Abstract

To provide an electric motor which materializes simplification of the structure of a metallic mold, thereby materializing suppression of an increase in work processes, and to provide a hermetic compressor comprising the electric motor.SOLUTION: An electric motor according to the present invention comprises a stator 10a and a rotor 10b rotating inside the stator 10a. The stator 10a comprises a stator core 110 and an insulator 120 covering the stator core 110. A coil 140 is wound, vial the insulator 120, around a plurality of teeth portions 112 formed in the stator core 110. The insulator 120 comprises a groove portion 126 having an opening in the rotary shaft direction and into which a power wire 142 of the coil 140 is inserted, and a pair of locking projections 127a and 127b which restrain coming off of the power wire 142 inserted in the groove portion 126. The pair of locking protrusions 127a and 127b and the groove portion 126 are arranged at radially displaced positions when viewed from the rotary shaft direction.SELECTED DRAWING: Figure 8

Description

The present invention relates to an electric motor and a hermetic electric compressor provided with this electric motor.

As a conventional electric motor, for example, a technique described in Patent Document 1 has been proposed. In Patent Literature 1, a stator core is divided and configured, and insulators for insulation are attached to the divided cores. The insulator covers the tooth portion of the stator core, includes a tooth covering portion on which the coil is wound, an outer collar that insulates between the outer peripheral side of the coil and the split yoke, and the inner peripheral side of the coil and the inner tip of the tooth portion. It is composed of an inner flange that insulates the overhanging shoe portion.

The upper portion of the outer flange is formed with a groove extending radially and open at the top for inserting the terminal wire of the coil. The groove is provided with a pair of locking projections projecting from both side wall portions of the groove so as to face each other in the circumferential direction.

JP 2017-195647 A

The insulator is made of an insulating resin material. A mold is required to mold the insulator from a resin material. When molding the teeth cover, outer collar, and inner collar, after filling the mold with resin, the mold is moved in the direction of the rotation axis to release the molded product. The collar can be molded.

When the groove is to be molded together with the tooth covering portion, the outer collar, and the inner collar, the locking projection becomes an undercut, and the mold cannot be moved in the rotation axis direction to release the molded product. For this reason, a slide core that moves in a direction intersecting with the direction of the rotation axis is required to form the locking projection.

In the technique described in Patent Document 1, since it is necessary to use a slide core for molding the locking projection, there is a problem that the structure of the mold becomes complicated and the number of work steps increases.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems, simplify the structure of a mold, and provide an electric motor that suppresses an increase in work processes, and a hermetic compressor equipped with this electric motor.

In order to achieve the above object, the present invention includes a stator and a rotor that rotates inside the stator, the stator includes a stator core and an insulator that covers the stator core, and a plurality of stator cores formed on the stator core. An electric motor in which a coil is wound around the tooth portion via the insulator, and the insulator has a groove portion having an opening in the rotation axis direction and into which the end wire of the coil is inserted, and the groove portion is inserted into the groove portion. and a pair of locking protrusions for suppressing the terminal wire from slipping out, wherein the pair of locking protrusions and the groove are arranged at radially displaced positions when viewed from the rotation axis direction. .

ADVANTAGE OF THE INVENTION According to this invention, the structure of a metal mold|die can be simplified and the electric motor which suppressed the increase of a work process, and a hermetic compressor provided with this electric motor can be provided.

1 is a longitudinal sectional view of a scroll compressor according to Embodiment 1 of the present invention; FIG. 1 is an exploded perspective view of a stator forming part of an electric motor according to Embodiment 1 of the present invention; FIG. 1 is a perspective view of a stator core according to Example 1 of the present invention; FIG. 1 is an upper perspective view of an upper insulator according to Example 1 of the present invention, viewed obliquely from above; FIG. FIG. 2 is a bottom perspective view of the upper insulator according to the first embodiment of the present invention, viewed obliquely from below; 1 is an upper perspective view of a lower insulator according to Example 1 of the present invention, viewed obliquely from above; FIG. FIG. 4 is a bottom perspective view of the bottom insulator according to the first embodiment of the present invention, viewed obliquely from below; It is the perspective view which looked at the stator which concerns on Example 1 of this invention from upper diagonal. FIG. 7 is an enlarged view of a main part of a VII section shown in FIG. 6; 7 is an arrow view of the VIII part shown in FIG. 6. FIG. FIG. 4 is a top view of the locking protrusion according to Example 1 of the present invention as viewed from above; It is the figure which looked at the locking projection and groove part which concern on Example 1 of this invention from the outer peripheral side (diameter direction outer side). FIG. 2 is a layout diagram of a mold for molding an insulator in a state in which a groove portion according to Example 1 of the present invention is viewed from the inner peripheral side (inside in the radial direction); FIG. 2 is a layout diagram of a mold for molding an insulator in a state in which a groove portion according to Example 1 of the present invention is viewed from the outer peripheral side (outside in the radial direction); FIG. 10 is an enlarged perspective view of locking projections of an upper insulator according to a second embodiment of the present invention, viewed from the radially outer side; FIG. 10 is an enlarged perspective view of locking projections of an upper insulator viewed from the radially inner side according to a second embodiment of the present invention; FIG. 11 is an enlarged perspective view of a locking projection of an upper insulator viewed from above according to a second embodiment of the present invention;

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Similar components are denoted by similar reference numerals, and similar descriptions are not repeated.

The various constituent elements of the present invention do not necessarily have to be independent entities, and one constituent element may consist of a plurality of members, a plurality of constituent elements may consist of one member, a certain constituent element may part of a component, part of one component overlaps part of another component, and so on.

<Summary of scroll compressor>
FIG. 1 is a longitudinal sectional view of a scroll compressor according to Embodiment 1 of the present invention. INDUSTRIAL APPLICABILITY The scroll compressor of the present invention is used, for example, in a refrigeration cycle device such as a water heater.

The scroll compressor 1 includes a fixed scroll 2 that compresses a working fluid, an orbiting scroll 3, a crankshaft 6 that rotates the orbiting scroll 3, a frame 4 having a main bearing 7 for the crankshaft 6, and a rotational force on the crankshaft 6. and a casing 8 enclosing them. The fixed scroll 2 and the orbiting scroll 3 constitute a compression mechanism.

The scroll compressor 1 has a suction pipe 9 with one end connected to the outside of the scroll compressor and the other end connected to a suction port 2s. When the working fluid is taken into the scroll compressor 1 from one end of the suction pipe 9, the working fluid is introduced from the suction port 2s at the other end into a suction chamber (not shown) formed by the fixed scroll 2 and the orbiting scroll 3. be done. The working fluid introduced into the suction chamber is compressed by the scroll and discharged to the fixed back chamber 11 located above the fixed scroll 2 . The discharged compressed fluid flows below the casing 8 to raise the pressure of the oil in the oil reservoir 12 stored below the casing 8 .

A lower end of an oil supply pipe 6x immersed in the oil reservoir 12 is arranged on the crankshaft 6, and the oil in the oil reservoir 12 is pumped up to a back pressure chamber 13 formed between the orbiting scroll 3 and the frame 4. Thus, the back pressure chamber 13 can function as an oil reservoir. Since the pressure of the oil flowing into the back pressure chamber 13 becomes the discharge pressure Pd due to the above-described process, the pressure in the back pressure chamber 13 rises due to the inflow of the oil. The pressure in the back pressure chamber 13 increases, and the orbiting scroll 3 is pressed against the fixed scroll 2 . An eccentric portion 6a located at the upper end of the crankshaft 6 is inserted into the orbiting bearing 14 on the lower surface of the orbiting scroll 3. As shown in FIG. The orbiting scroll 3 orbits along with the rotation of the crankshaft 6 and moves relative to the fixed scroll 2 .

The pressure of the working fluid flowing out to the fixed rear chamber 11 is defined as a discharge pressure Pd. The working fluid that has flowed out to the fixed back chamber 11 flows into the space on the side of the oil storage section 12 below the casing 8 , applies a discharge pressure Pd to the oil storage section 12 , and is discharged to the outside through the discharge pipe 15 . Due to the pressure applied to the oil reservoir 12, the oil rises through the oil supply hole 6b provided in the crankshaft. Since the pressure is increased by this oil, the pressure in the back pressure chamber 13 (referred to as back pressure) becomes higher than the suction pressure Ps, which is the pressure at the suction port 2s.

<Structure of stator>
The configuration of the electric motor used in the scroll compressor 1 will be described below. FIG. 2 is an exploded perspective view of a stator that constitutes a part of the electric motor according to Embodiment 1 of the present invention.

The electric motor 10 is composed of a stator 10a and a rotor 10b (see FIG. 1) that rotates inside the stator 10a. Although not shown, the rotor 10b has six permanent magnets. The stator 10a includes a stator core 110 formed by laminating a plurality of electromagnetic steel sheets, an insulator 120 covering the stator core 110, and a slot insulating paper 130 inserted into a plurality of slots 114 formed in the stator core 110. . Insulator 120 is composed of upper insulator 120 a covering stator core 110 above and lower insulator 120 b covering stator core 110 below.

<Structure of stator core>
FIG. 3 is a perspective view of a stator core according to Example 1 of the present invention. Stator core 110 is configured by stacking a plurality of electromagnetic steel sheets, and includes yoke portion 111 forming an outer peripheral portion, a plurality of (nine) teeth portions 112 protruding from yoke portion 111 toward the inner peripheral side, and rotor 10b. It has tooth tip portions 113 facing the outer peripheral surface and slots 114 formed between the plurality of tooth portions 112 .

The yoke portion 111 is formed in a cylindrical shape. A plurality of teeth portions 112 are formed in a columnar shape.

The tooth portion 112 is formed continuously on the inner peripheral surface of the yoke portion 111 and is formed to protrude from the inner peripheral surface toward the rotor 10b side (inner peripheral side). Coils 140 ( FIG. 6 ) are wound around the plurality of teeth portions 112 via insulators 120 .

Teeth tip portions 113 are formed on the rotor 10b side (inner peripheral side) of teeth portions 112 . The circumferential width of tooth tip portion 113 is formed to be wider than the circumferential width of tooth portion 112 . Teeth tip portion 113 faces the outer peripheral surface of rotor 10b.

Coils 140 wound around the teeth 112 are accommodated in the slots 114 formed between the teeth 112 .

In this embodiment, the stator core 110 has an enlarged slot portion 114a and an enlarged slot portion 114b in which the slot size at the axially upper end portion and the axially lower end portion is larger than that at the axially central portion. It forms an upper side surface 112a and a lower side surface 112b.

<Structure of insulator>
FIG. 4A is an upper perspective view of the upper insulator according to Example 1 of the present invention, viewed obliquely from above. FIG. 4B is a bottom perspective view of the upper insulator according to Example 1 of the present invention, viewed obliquely from below.

First, the material of insulator 120 will be described. Refrigerants used in the refrigeration cycle of water heaters, refrigerators, etc. are HFC R410A, R407C, CO2, etc. In this case, the refrigerating machine oil is polyol ester oil that has good compatibility with HFC refrigerants, and polyol ester oil with good compatibility with CO2 refrigerants. There are ester oils, polyalkylene glycol oils, polyalphaolefin oils, paraffinic mineral oils, naphthenic mineral oils, and the like. The refrigerating machine oil should have a viscosity of 20 to 180 cSt at 40°C. The insulator used in the motor uses PPS (polyphenylene sulfide) or LCP (liquid crystal polymer) which is structurally stable in a supercritical state in the presence of CO2. The amount of oligomer extracted from these insulators is hardly observed, and the amount of oligomer extracted is greatly reduced compared to the PET film conventionally used for motors. There are two types of PPS: linear type and cross-linked type. In the cross-linked type, a large amount of oligomer is extracted, so it is preferable to use a heat pump insulator without glass fiber, but 10 to 40% of glass fiber is added to maintain strength. No problem in any case.

In general grades of PBT (polybutylene terephthalate) and PET (polyethylene terephthalate), the extraction of oligomers is high, and there is a concern that cooling failure may occur due to abrasion of sliding parts and clogging of capillaries, so terminal active groups (-OH, -COOH) Specifications for low oligomer grades that block

The insulator 120 is composed of an upper insulator 120a and a lower insulator 120b. Upper insulator 120a is arranged above stator core 110, lower insulator 120b is arranged below stator core 110, and stator core 110 is sandwiched between upper insulator 120a and lower insulator 120b.

A configuration of the upper insulator 120a will be described. The upper insulator 120a is formed so as to protrude toward the rotor 10b side (inner peripheral side) from the outer peripheral wall portion 121a formed in an annular shape, and the inner peripheral surface of the outer peripheral wall portion 121a. A covering tooth covering portion 122a and a tooth tip covering portion 123a extending upward from the inner peripheral end of the tooth covering portion 122a and covering the upper portion of the tooth tip portion 113 are provided. Further, the tooth covering portion 122a includes a tooth covering portion side wall 122a1 formed so as to protrude downward so as to cover the upper side surface 112a of the tooth portion 112. As shown in FIG.

Above the outer peripheral wall portion 121a, a plurality of neutral point terminal blocks 124 for connecting the neutral wire of the coil 140 and protruding upward from the upper portion of the outer peripheral wall portion 121a (protruding from the outer peripheral wall portion 121a in the rotation axis direction). A plurality of protrusions 125 around which the power wire of the coil 140 is wound, and grooves 126 cut downward (in the rotation axis direction) from the upper portion of the outer peripheral wall portion 121a to hold the power wire 142 are formed. there is Groove portion 126 has an opening in the rotation axis direction and is formed to extend in the radial direction of upper insulator 120a. A pair of locking protrusions 127 projecting radially outward from the outer peripheral wall portion 121a are provided on the outer peripheral side of the outer peripheral wall portion 121a where the groove portion 126 is located. A configuration of the locking projection 127 will be described later.

Further, a guide protrusion 128 is formed on the outer peripheral surface of the outer peripheral wall portion 121a and protrudes radially outward from the outer peripheral surface. The guide projection 128 is located between the neutral point terminal block 124 and the projection portion 125 and arranged closer to the neutral point terminal block 124 side.

Next, the configuration of the lower insulator 120b will be described. FIG. 5A is an upper perspective view of the lower insulator according to Example 1 of the present invention, viewed obliquely from above. FIG. 5B is a bottom perspective view of the bottom insulator according to Example 1 of the present invention, viewed obliquely from below.

The lower insulator 120b is formed so as to protrude toward the rotor 10b side (inner peripheral side) from the outer peripheral wall portion 121b formed in an annular shape, and the inner peripheral surface of the outer peripheral wall portion 121b. Teeth covering portion 122b for covering, and tooth tip covering portion 123b extending downward from the inner circumference side end portion of tooth covering portion 122b and covering the lower portion of tooth tip portion 113 are provided. Moreover, the tooth covering portion 122b includes a tooth covering portion side wall 122b1 formed so as to protrude upward so as to cover the lower side surface 112b of the tooth portion 112. As shown in FIG.

<Configuration of assembled stator>
FIG. 6 is a perspective view of the stator according to Example 1 of the present invention, viewed obliquely from above. 7 is an enlarged view of a main portion of the VII section shown in FIG. 6. FIG. 8 is an arrow view of the VIII part shown in FIG. 6. FIG. FIG. 9 is a top view of the locking protrusion according to Example 1 of the present invention.

Insulators 120 (upper insulator 120 a and lower insulator 120 b ) are arranged in stator core 110 , and slot insulating paper 130 is arranged in slots 114 . In this state, the coil 140 is wound around the tooth portion 112 of the stator core 110 via the tooth covering portions 122 a and 122 b and the slot insulating paper 130 . When the coil 140 is wound around the tooth portion 112, the tooth tip covering portions 123a and 123b function as restricting members that restrict the movement of the coil 140 to the inner peripheral side (toward the rotor 10b). The radially inner side of the tooth tip portion 113 is not covered with the insulator 120 and is exposed so as to face the rotor 10b.

A three-phase AC motor is used for the compressor of this embodiment. The stator core 110 of this embodiment is provided with nine teeth 112 , and three coils 140 constituting U-phase, V-phase, and W-phase are wound around the nine teeth 112 .

After the coil 140 is wound around each of the plurality of teeth 112 , the terminal wires at the winding start and winding end of the coil 140 are divided into a neutral wire 141 and a power supply wire 142 , which are connected to the coil end of the stator and the insulator 120 . is pulled around.

A neutral wire 141 is connected to a terminal of the neutral terminal block 124 . Part of the neutral wire 141 connected to the terminal of the neutral terminal block 124 is guided to the outer peripheral side of the outer peripheral wall portion 121a, hung on the outer peripheral surface of the guide projection portion 128, and wired while applying tension. . By wiring in this way, slackness of the neutral wire 141 is suppressed.

The power line 142 is wound several times while applying tension to the protrusion 125 provided on the upper portion of the outer peripheral wall portion 121a, and then inserted into an insulating tube 143 formed by cylindrically forming an insulating film made of PET, PEN, or the like. , is guided into the groove 126 together with the insulating tube 143 and inserted. A pair of locking protrusions 127a and 127b protruding radially outward from the outer peripheral wall portion 121a are provided on the outer peripheral side of the outer peripheral wall portion 121a where the groove portion 126 is formed to prevent the power line 142 from coming off. A protruding portion 125 around which the power line 142 is wound is provided on the upper portion of the outer peripheral wall portion 121a. In this embodiment, since the projecting portion 125 is arranged above the outer peripheral wall portion 121a, an insulating distance from the neutral wire 141 can be ensured.

Inclined surfaces 127a1 and 127b1 are formed on opposing surfaces of the pair of locking projections 127a and 127b, respectively. The inclined surfaces 127a1 and 127b1 are formed so that the distance between them decreases from the opening of the groove 126 toward the bottom. The distance between the tip portions 127a2 and 127b2 of the inclined surfaces 127a1 and 127b1 (locking projection 127) is arranged so as to be narrower than the opening width of the groove portion 126 (see FIGS. 9 and 10A).

The power wire 142 inserted into the insulating tube 143 is inserted into the groove portion 126 along the inclined surfaces 127a1 and 127b1. Then, the insulating tube 143 is elastically deformed at the tip portions 127a2 and 127b2 of the inclined surfaces 127a1 and 127b1, and the power line 142 is accommodated in the bottom of the groove portion 126. As shown in FIG. Since the distance between the tip portions 127a2 and 127b2 is narrower than the opening width of the groove portion 126, the power line 142 can be prevented from slipping out of the groove portion 126. FIG.

The power wires 142 inserted into the grooves 126 are wired on the coil 140 , and the plurality of power wires 142 are bundled and connected to the connection terminals 150 .

<Insulator molding method>
As described above, insulator materials for compressor motors used in water heaters and refrigerators are required to have high heat resistance and low oligomerization properties. LCP, PPS, and PBT are used as materials having excellent properties.

On the other hand, considering the moldability of the insulator, the LCP material has the highest fluidity and can be injection-molded at a lower molding pressure than the other materials, but there is a problem that the cost is high. When relatively inexpensive PPS or PBT materials are used, their fluidity is poor, so it is necessary to increase the molding pressure in order to spread the resin all the way to the end of the thin plate. Burrs are more likely to occur on the ground line.

In the case of a compressor motor, burrs generated on the insulator are usually removed by deburring work, but if burrs remain without being removed in this process, the lead wire of the motor will be routed to the location where burrs are generated. The coating of the enamelled wire may be damaged by the heat, or burrs may drop into the refrigerating machine oil in the compressor container, and the burrs may get caught in the sliding parts along the oil supply route, which may significantly reduce the reliability of the compressor. .

When the groove portion and the locking projection overlap in the release direction of the mold, the locking projection becomes an undercut with respect to the groove, and the mold can be moved in the rotation axis direction to release the molded product. Can not. For this reason, a slide core that moves in a direction intersecting with the direction of the rotation axis is required to form the locking projection. The use of the slide core raises the problem of an increase in cost, an increase in mold parting lines, and an increase in the number of locations where burrs are generated.

Means for solving this problem will be described with reference to FIGS. 8 to 10C. FIG. 10A is a diagram of locking protrusions and grooves according to Example 1 of the present invention as seen from the outer peripheral side (outside in the radial direction). FIG. 10B is a layout diagram of a mold for molding an insulator in a state in which the groove portion according to Example 1 of the present invention is viewed from the inner peripheral side (diameter direction inner side). FIG. 10C is a layout diagram of a mold for molding an insulator in a state in which the groove portion according to Example 1 of the present invention is viewed from the outer peripheral side (outside in the radial direction).

As shown in FIG. 10A, when the locking projection and the groove are viewed from the outer peripheral side (diameter direction outside), the distance between the tip portions 127a2 and 127b2 of the inclined surfaces 127a1 and 127b1 (locking projection 127) is equal to the opening of the groove 126. It has a positional relationship such that it is narrower than the width. When the insulator 120 is molded with a mold, the distance between the tips 127a2 and 127b2 of the locking projection 127 is narrower than the opening width of the groove 126, so the tips 127a2 and 127b2 are caught and the insulator 120 is released from the mold. Can not.

Therefore, in this embodiment, as shown in FIGS. 8 and 9, the locking projection 127 is provided so as to protrude from the outer peripheral surface of the outer peripheral wall portion 121a toward the outer peripheral side (outward in the radial direction). In other words, as shown in FIG. 9, the groove 126 and the locking projection 127 are arranged at positions that do not overlap when viewed from above (rotational axis direction), that is, positions that are shifted in the radial direction.

Insulator 120 is formed in an annular shape. In molding the insulator 120, two molds facing each other in the rotation axis direction are prepared. After the mold is filled with resin and molded, the mold is moved in the rotation axis direction to release the insulator 120 . At this time, the groove portion 126 is formed by the upper mold of the mold, and the locking projection 127 is formed by the upper mold and the lower mold.

The upper mold for molding the groove 126 forms a shape as a dividing surface so as to follow the shape of the groove 126 .

On the other hand, the upper mold and the lower mold for molding the locking projection 127 form the positions of the tip portions 127a2 and 127b2 of the inclined surfaces 127a1 and 127b1 as mutual dividing surfaces. Since there is no undercut portion in the upper mold and the lower mold for molding the locking projection 127, the insulator 120 can be released from the upper mold and the lower mold.

According to the first embodiment, the groove 126 and the locking projection 127 are arranged at radially displaced positions when viewed from above (rotational axis direction). Even when the groove portion 126 and the locking projection 127 are formed using a mold, undercut portions can be avoided.

According to the first embodiment, there is no need for a slide core to be moved in the direction intersecting with the rotation axis direction, the structure of the mold is simplified, and an electric motor that suppresses an increase in work processes and a hermetic compressor equipped with this electric motor are provided. can provide. Further, according to the first embodiment, since the slide core is not required, an increase in the parting line portion of the mold can be suppressed, and burrs can be suppressed at locations where burrs are generated.

In Example 1, the locking protrusion 127 is provided so as to protrude from the outer peripheral surface of the outer peripheral wall portion 121a toward the outer peripheral side (diametrically outward). You may make it provide so that it may protrude toward radial direction inner side.

A second embodiment of the present invention will be described with reference to FIGS. 11 to 13. FIG. FIG. 11 is an enlarged perspective view of a locking projection of an upper insulator according to a second embodiment of the present invention, viewed from the radially outer side. FIG. 12 is an enlarged perspective view of a locking projection of an upper insulator according to a second embodiment of the present invention, viewed from the inside in the radial direction. FIG. 13 is an enlarged perspective view of locking protrusions of an upper insulator according to a second embodiment of the present invention, viewed from above. The same reference numerals are assigned to the same configurations as those of the first embodiment, and detailed description thereof will be omitted.

In the first embodiment, the locking projection 127 is formed so as to protrude radially outward from the outer peripheral wall portion 121a of the upper insulator 120a. It was formed so as to protrude upward (rotating shaft direction) from the upper part of 121a.

A pair of locking protrusions 127c and 127d are formed on the upper portion (rotational axis direction) of the outer peripheral wall portion 121a of the upper insulator 120a in which the groove portion 126 is formed so as to sandwich the groove portion 126 therebetween. Locking protrusions 127c and 127d protrude upward from the upper portion of outer peripheral wall portion 121a of upper insulator 120a.

Inclined surfaces 127c1 and 127d1 are formed on opposing surfaces of the pair of locking projections 127c and 127d, respectively. The inclined surfaces 127c1 and 127d1 are formed so that the distance between them decreases from the opening of the groove 126 toward the bottom. The distance between the tip portions 127c2 and 127d2 of the inclined surfaces 127c1 and 127d1 (locking projection 127) is positioned so as to be narrower than the opening width of the groove portion 126 (see FIGS. 12 and 13).

The power wire 142 inserted into the insulating tube 143 is inserted into the groove portion 126 along the inclined surfaces 127c1 and 127d1. As the power supply line 142 is inserted, the locking protrusions 127c and 127d are elastically deformed so as to separate from each other, and the insulating tube 143 is elastically deformed at the distal end portions 127c2 and 127d2 of the inclined surfaces 127c1 and 127d1, thereby Wire 142 fits in the bottom of groove 126 . Since the distance between the tip portions 127c2 and 127d2 is narrower than the opening width of the groove portion 126, the power line 142 can be prevented from slipping out of the groove portion 126. FIG.

A power wire support portion 127d3 protruding radially outward from the outer peripheral surface of the outer peripheral wall portion 121a is formed on the locking projection 127d. The power line support portion 127d3 protrudes radially outward from the inclined surface 127d1. A power wire 142 inserted into an insulating tube 143 is placed on the upper part of the power wire supporting portion 127d3 and guided to the groove portion 126. As shown in FIG. In addition, the neutral wire 141 hooked on the outer peripheral surface of the guide protrusion 128 is led to the lower part of the power wire supporting portion 127d3 and wired while applying tension.

Slanted surfaces 127c1 and 127d1 of locking projections 127c and 127d are arranged to protrude radially outward from the outer peripheral surface of outer peripheral wall portion 121a when upper insulator 120a is viewed from above (in the rotation axis direction). In other words, as shown in FIG. 13, the groove 126 and the inclined surfaces 127c1 and 127d1 are arranged at radially displaced positions so that they do not overlap when viewed from above (in the rotation axis direction).

In molding the insulator 120, two molds facing each other in the rotation axis direction are prepared. After the mold is filled with resin and molded, the mold is moved in the rotation axis direction to release the insulator 120 . At this time, the locking protrusion 127 except for the groove 126 and the inclined surfaces 127c1 and 127d1 is formed by the upper mold, and the inclined surfaces 127c1 and 127d1 are formed by the upper and lower molds.

The upper die for forming the groove 126 is formed as a dividing surface so as to follow the shape of the locking projection 127 except for the groove 126 and the inclined surfaces 127c1 and 127d1.

On the other hand, the upper mold and the lower mold for forming the inclined surfaces 127c1 and 127d1 form the positions of the tip portions 127c2 and 127d2 of the inclined surfaces 127c1 and 127d1 as mutual dividing surfaces. Since the upper and lower dies that form the inclined surfaces 127c1 and 127d1 do not have undercut portions, the insulator 120 can be released from the upper and lower dies.

According to the second embodiment, in addition to the effects of the first embodiment, a pair of locking projections 127c and 127d are formed on the upper portion of the outer peripheral wall portion 121a of the upper insulator 120a. , 127d are elastically deformed so as to separate from each other, it is possible to prevent the power line 142 from being damaged by the tip portions 127c2 and 127d2 of the inclined surfaces 127c1 and 127d1.

Further, according to the second embodiment, since the groove 126 and the inclined surfaces 127c1 and 127d1 are arranged at positions shifted in the radial direction when viewed from above, a mold that moves in the direction of the rotation axis orthogonal to the radial direction is used. Even when the groove portion 126 and the locking projection 127 are formed by using the same method, undercut portions can be avoided.

Furthermore, according to the second embodiment, the slide core that moves in the direction intersecting with the direction of the rotation axis is not required, the structure of the mold is simplified, and the increase in work processes is suppressed. can be provided. Further, according to the second embodiment, since the slide core is not required, the increase in the parting line portion of the mold can be suppressed, and the occurrence of burrs can be suppressed.

In addition, the present invention is not limited to the above-described embodiments, and includes various modifications. The above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the described configurations. For example, although an example of a motor with 6 poles and 9 slots has been described, the number of poles and the number of slots are not limited to this. Further, the type of compressor is not limited to scroll compressors, and can be applied to hermetic electric compressors such as rotary compressors and reciprocating compressors. In the above-described embodiment, the upper insulator having the features of the present invention and the lower insulator not having the features of the present invention have different shapes. may be used.

DESCRIPTION OF SYMBOLS 1... Scroll compressor, 2... Fixed scroll, 2s... Suction port, 3... Revolving scroll, 4... Frame, 6... Crankshaft, 6a... Eccentric part, 6b... Oil supply hole, 6x... Oil supply pipe, 7... Main bearing, DESCRIPTION OF SYMBOLS 8... Casing 9... Suction pipe 10... Electric motor 10a... Stator 10b... Rotor 11... Fixed rear chamber 12... Oil reservoir 13... Back pressure chamber 14... Rotation bearing 15... Discharge pipe 110... Stator core 111 yoke portion 112 tooth portion 112a upper side surface 112b lower side surface 113 tooth tip portion 114 slot 114a, 114b enlarged slot portion 120 insulator 120a upper insulator 120b Lower insulator 121a, 121b Peripheral wall portion 122a, 122b Teeth covering portion 122a1, 122b1 Teeth covering portion side wall 123a, 123b Teeth tip covering portion 124 Neutral point terminal block 125 Protrusion , 126... Grooves 127, 127a, 127b, 127c, 127d... Locking protrusions 127a1, 127b1, 127c1, 127d1... Inclined surfaces 127a2, 127b2, 127c2, 127d2... Tip parts 127d3... Power supply wire support parts 128... Guide protrusion 130 Slot insulation paper 140 Coil 141 Neutral wire 142 Power supply wire 143 Insulation tube 150 Connection terminal

Claims (8)

comprising a stator and a rotor that rotates inside the stator;
The stator includes a stator core and an insulator covering the stator core,
An electric motor in which a coil is wound through the insulator on a plurality of teeth formed in the stator core,
The insulator includes a groove portion having an opening in the rotation axis direction and into which the terminal wire of the coil is inserted, and a pair of locking projections that suppress the withdrawal of the terminal wire inserted in the groove portion,
The electric motor according to claim 1, wherein the pair of locking projections and the groove are arranged at radially displaced positions when viewed from the direction of the rotating shaft. In claim 1,
The pair of locking protrusions are formed to protrude radially outward from the outer peripheral surface of the outer peripheral wall portion of the insulator, or protrude radially inward from the inner peripheral surface of the outer peripheral wall portion of the insulator. An electric motor characterized by: In claim 1 or 2,
The electric motor, wherein the pair of locking projections are provided with inclined surfaces formed so that the distance between them decreases from the opening of the groove toward the bottom. In claim 3,
The electric motor, wherein the distance between the tip end portions of the inclined surfaces is arranged to be narrower than the opening width of the groove portion. In any one of claims 1 to 4,
The insulator has a protrusion that protrudes from the outer peripheral wall of the insulator in the rotation axis direction and around which the terminal wire is wound,
An electric motor according to claim 1, wherein after the terminal wire is wound around the protrusion, the terminal wire is guided into the groove. In claim 5,
The terminal wires are a power wire and a neutral wire,
A guide protrusion projecting radially outward from the outer peripheral surface is formed on the outer peripheral surface of the outer peripheral wall portion of the insulator,
The electric motor, wherein the power line is inserted into the groove, and the neutral line is hooked on the guide protrusion. comprising a stator and a rotor that rotates inside the stator;
The stator includes a stator core and an insulator covering the stator core,
An electric motor in which a coil is wound through the insulator on a plurality of teeth formed in the stator core,
The insulator includes a groove portion having an opening in the rotation axis direction and into which the terminal wire of the coil is inserted, and a pair of locking projections that suppress the withdrawal of the terminal wire inserted in the groove portion,
The pair of locking projections are formed to project from the rotational axis direction of the insulator so as to sandwich the groove,
The pair of locking projections have inclined surfaces formed so that the distance between them decreases from the opening of the groove toward the bottom,
The electric motor according to claim 1, wherein the inclined surface and the groove are arranged at radially displaced positions when viewed from the rotating shaft direction. A closed electric compressor comprising a compression mechanism for compressing a working fluid, an electric motor for driving the compression mechanism, and a casing enclosing the compression mechanism and the electric motor,
A hermetic electric compressor, wherein the electric motor is the electric motor according to any one of claims 1 to 7.

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