JP7437360B2 - Electric motor and hermetic electric compressor equipped with this electric motor - Google Patents

Description

The present invention relates to an electric motor and a hermetic electric compressor equipped with the electric motor.

As a conventional electric motor, for example, a technique described in Patent Document 1 has been proposed. In Patent Document 1, a stator core is configured by being divided, and an insulator for insulation is attached to the divided core. The insulator covers the teeth of the stator core and includes a teeth sheathing part around which the coil is wound, an outer flange that insulates between the outer circumference of the coil and the split yoke, and an inner circumference of the coil and the inner tip of the teeth. It consists of an inner flange that insulates the protruding shoe part.

A groove that extends in the radial direction and is open at the top is formed in the upper part of the outer flange, into which the terminal wire of the coil is inserted. The groove is provided with a pair of locking protrusions that protrude from both side walls of the groove to face each other in the circumferential direction.

Japanese Patent Application Publication No. 2017-195647

The insulator is made of an insulating resin material. When molding an insulator using a resin material, a mold is required. To mold the teeth covering part, outer flange, and inner flange, after filling the mold with resin, move the mold in the direction of the rotation axis to release the molded product. The tsuba can be molded.

When attempting to mold the groove together with the tooth covering portion, outer flange, and inner flange, the locking protrusion becomes an undercut, making it impossible to move the mold in the direction of the rotation axis and release the molded product. Therefore, in molding the locking protrusion, a slide core that is moved in a direction intersecting the direction of the rotation axis is required.

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

An object of the present invention is to provide an electric motor that solves the above problems, simplifies the structure of a mold, and suppresses an increase in the number of work steps, 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 includes a plurality of insulators formed on the stator core. The electric motor has a coil wound around the teeth through the insulator, and the outer circumferential wall of the insulator has a neutral point terminal block to which the neutral wire of the coil is connected, and a neutral terminal block extending in the direction of the rotation axis. a groove having an opening into which the power wire of the coil is inserted; a pair of locking protrusions that prevent the power wire inserted into the groove from coming out; and a pair of locking protrusions that protrude from the outer peripheral wall of the insulator in the direction of the rotation axis. a protrusion; a guide protrusion that protrudes radially outward from the outer peripheral surface of the outer peripheral wall of the insulator and is formed between the neutral point terminal block and the protrusion at a position in the circumferential direction; The pair of locking protrusions and the groove are disposed at positions shifted in the radial direction when viewed from the direction of the rotation axis , and the neutral wire is guided to the outer peripheral wall of the insulator and the guide protrusion The power wire is wound around the protrusion and then connected to the neutral point terminal block, and the power wire is wound around the protrusion and then guided to the groove .

According to the present invention, it is possible to provide an electric motor in which the structure of a mold is simplified and an increase in work steps is suppressed, and a hermetic compressor equipped with this electric motor.

1 is a longitudinal cross-sectional view of a scroll compressor according to Example 1 of the present invention. FIG. 1 is an exploded perspective view of a stator that constitutes a part of the electric motor according to the first embodiment of the present invention. FIG. 2 is a perspective view of a stator core according to Example 1 of the present invention. FIG. 2 is an upper perspective view of the upper insulator according to Example 1 of the present invention, viewed diagonally from above. FIG. 2 is a bottom perspective view of the upper insulator according to Example 1 of the present invention, viewed obliquely from below. FIG. 2 is an upper perspective view of the lower insulator according to Example 1 of the present invention, viewed diagonally from above. FIG. 2 is a bottom perspective view of the lower insulator according to Example 1 of the present invention, viewed diagonally from below. FIG. 2 is a perspective view of the stator according to the first embodiment of the present invention, viewed diagonally from above. 7 is an enlarged view of the main part of section VII shown in FIG. 6. FIG. FIG. 7 is a view taken along the arrows of section VIII shown in FIG. 6; FIG. 3 is a top view of the locking protrusion according to the first embodiment of the present invention, viewed from above. FIG. 3 is a diagram of a locking protrusion and a groove according to Example 1 of the present invention, viewed from the outer peripheral side (radially outer side). FIG. 2 is a layout diagram of a molding die for 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 (radially inner side). FIG. 2 is a layout diagram of a molding die for an insulator in a state in which a groove portion according to Example 1 of the present invention is viewed from the outer circumferential side (radially outer side). FIG. 7 is an enlarged perspective view of a locking protrusion when the upper insulator according to Example 2 of the present invention is viewed from the outside in the radial direction. FIG. 7 is an enlarged perspective view of a locking protrusion when the upper insulator according to Example 2 of the present invention is viewed from the inside in the radial direction. FIG. 7 is an enlarged perspective view of a locking protrusion when the upper insulator according to Example 2 of the present invention is viewed from above.

Embodiments of the present invention will be described below with reference to the accompanying drawings. Similar components are given the same reference numerals, and similar descriptions will not be repeated.

The various components of the present invention do not necessarily have to exist independently, and one component may be made up of multiple members, multiple components may be made of one member, or a certain component may be different from each other. It is allowed that a part of a certain component overlaps with a part of another component, etc.

<Overview of scroll compressor>
FIG. 1 is a longitudinal sectional view of a scroll compressor according to Example 1 of the present invention. The scroll compressor of the present invention is used, for example, in a refrigeration cycle device of a water heater.

The scroll compressor 1 includes a fixed scroll 2 that compresses working fluid, an orbiting scroll 3, a crankshaft 6 that rotates the orbiting scroll 3, a frame 4 having a main bearing 7 of the crankshaft 6, and a frame 4 that applies rotational force to the crankshaft 6. The electric motor 10 is equipped with a casing 8 that encloses them. The fixed scroll 2 and the orbiting scroll 3 constitute a compression mechanism section.

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 the 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 into the fixed back chamber 11 located above the fixed scroll 2. The discharged compressed fluid flows below the casing 8 and pressurizes the oil in the oil storage section 12 stored below the casing 8.

The crankshaft 6 is provided with a lower end of an oil supply pipe 6x immersed in an oil storage section 12, and the oil in the oil storage section 12 is pumped up to a back pressure chamber 13 formed between the orbiting scroll 3 and the frame 4. This allows the back pressure chamber 13 to 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-mentioned circumstances, the pressure of the back pressure chamber 13 increases due to the inflow of the oil. The pressure in the back pressure chamber 13 increases, and thereby the orbiting scroll 3 is pressed against the fixed scroll 2. Further, the 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. The orbiting scroll 3 rotates as the crankshaft 6 rotates and moves relative to the fixed scroll 2 .

The pressure of the working fluid flowing out into the fixed back chamber 11 is defined as the discharge pressure Pd. The working fluid flowing into the fixed back chamber 11 flows into the space below the casing 8 on the side of the oil storage section 12, applies a discharge pressure Pd to the oil storage section 12, and is discharged from the discharge pipe 15 to the outside. The pressure applied to the oil storage portion 12 causes the oil to rise 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.

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

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

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

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

The teeth portion 112 is formed continuously on the inner circumferential surface of the yoke portion 111, and is formed to protrude from the inner circumferential surface toward the rotor 10b side (inner circumferential side). A coil 140 (FIG. 6) is wound around the plurality of teeth portions 112 via an insulator 120.

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

A coil 140 wound around the teeth 112 is accommodated in the slot 114 formed between the plurality of teeth 112 .

In this embodiment, the stator core 110 has an enlarged slot portion 114a and an enlarged slot portion 114b whose slot sizes are larger at the upper and lower ends in the axial direction than at the center portion in the axial direction. An upper side surface 112a and a lower side surface 112b are formed.

<Insulator configuration>
FIG. 4A is a top 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 diagonally from below.

First, the material of the insulator 120 will be explained. The refrigerants used in the refrigeration cycles of water heaters, refrigerators, etc. are HFC R410A, R407C, CO2, etc., and the refrigerating machine oil in this case is polyol ester oil, which has good compatibility with HFC refrigerants, and polyol ester oil with CO2 refrigerants. Examples include ester oil, polyalkylene glycol oil, polyalphaolefin oil, paraffinic mineral oil, and naphthenic mineral oil. The refrigerating machine oil should have a viscosity of 20 to 180 cSt at 40°C. The insulator used in the motor is PPS (polyphenylene sulfide) or LCP (liquid crystal polymer), which is structurally stable in a supercritical state in the coexistence of CO2. These insulators show almost no amount of oligomer extracted, and the amount of oligomer extracted is significantly reduced compared to PET films conventionally used in motors. There are linear types and cross-linked types of PPS, but cross-linked types tend to extract more oligomers, so those without glass fiber are preferred as heat pump insulators, but 10 to 40% glass fiber is added to maintain strength. There is no problem in that case.

General grades of PBT (polybutylene terephthalate) and PET (polyethylene terephthalate) have high oligomer extraction, and there is a risk of poor cooling due to sliding part wear and capillary blockage, so terminal active groups (-OH, -COOH) are used. It is necessary to specify a low oligomer grade that is sealed.

The insulator 120 includes 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.

The configuration of the upper insulator 120a will be explained. The upper insulator 120a has an annular outer peripheral wall 121a, and is formed to protrude from the inner peripheral surface of the outer peripheral wall 121a toward the rotor 10b (inner peripheral side), and covers the upper part of the teeth 112. A tooth covering portion 122a that covers the tooth covering portion 122a and a tooth tip covering portion 123a that extends upward from the inner circumferential end of the tooth covering portion 122a and covers the upper part of the tooth tip portion 113 are provided. Moreover, the tooth covering part 122a includes a tooth covering part side wall 122a1 formed to protrude downward so as to cover the upper side surface 112a of the tooth part 112.

At the upper part of the outer peripheral wall 121a, there are a plurality of neutral point terminal blocks 124 for connecting the neutral wire of the coil 140, which protrude upward from the upper part of the outer peripheral wall 121a (project from the outer peripheral wall 121a in the direction of the rotation axis). A plurality of protrusions 125 around which the power wire of the coil 140 is wound, and a groove 126 cut downward (in the direction of the rotation axis) from the upper part of the outer peripheral wall 121a and holding the power wire 142 are formed. There is. The groove portion 126 has an opening in the rotation axis direction and is formed to extend in the radial direction of the upper insulator 120a. A pair of locking protrusions 127 that protrude radially outward from the outer circumferential wall 121a are provided on the outer circumferential side of the outer circumferential wall 121a where the groove 126 is located. The structure of the locking protrusion 127 will be described later.

Further, a guide protrusion 128 is formed on the outer circumferential surface of the outer circumferential wall portion 121a, and projects from the outer circumferential surface toward the outside in the radial direction. The guide protrusion 128 is located between the neutral point terminal block 124 and the protrusion 125 and is arranged closer to the neutral point terminal block 124 side.

Next, the configuration of the lower insulator 120b will be explained. 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 lower insulator according to Example 1 of the present invention, viewed obliquely from below.

The lower insulator 120b includes an outer circumferential wall portion 121b formed in an annular shape, and is formed to protrude from the inner circumferential surface of the outer circumferential wall portion 121b toward the rotor 10b side (inner circumferential side). It includes a tooth covering portion 122b that covers the tooth covering portion 122b, and a tooth tip covering portion 123b that extends downward from the inner circumferential end of the tooth covering portion 122b and covers the lower part of the tooth tip portion 113. Further, the tooth covering portion 122b includes a tooth covering portion side wall 122b1 formed to protrude upward so as to cover the lower side surface 112b of the tooth portion 112.

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

Insulators 120 (upper insulator 120a, lower insulator 120b) 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 teeth portion 112 of the stator core 110 via the teeth covering portions 122a, 122b and the slot insulating paper 130. Teeth tip covering portions 123a and 123b function as a regulating member that restricts movement of coil 140 toward the inner circumference (toward rotor 10b) when coil 140 is wound around tooth portion 112. 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 in the compressor of this embodiment. The stator core 110 of this embodiment includes nine teeth portions 112, and three coils 140 constituting the U-phase, V-phase, and W-phase are wound around each of the nine teeth portions 112.

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

Neutral wire 141 is connected to a terminal of neutral point terminal block 124 . A part of the neutral wire 141 connected to the terminal of the neutral point terminal block 124 is guided to the outer circumferential side of the outer circumferential wall 121a, hung on the outer circumferential surface of the guide protrusion 128, and wired while applying tension. . By wiring in this way, slack in the neutral wire 141 is suppressed.

The power wire 142 is wound several times while applying tension around the protrusion 125 provided at the upper part of the outer peripheral wall 121a, and then inserted into an insulating tube 143 made of an insulating film made of a material such as PET or PEN and formed into a cylindrical shape. , and are guided and inserted into the groove 126 together with the insulating tube 143. A pair of locking protrusions 127a and 127b protruding radially outward from the outer circumferential wall 121a is provided on the outer circumferential side of the outer circumferential wall 121a where the groove 126 is formed, and prevents the power line 142 from coming off. The protrusion 125 around which the power line 142 is wound is provided on the upper part of the outer peripheral wall 121a. In this embodiment, since the protrusion 125 is arranged on the upper part of the outer peripheral wall 121a, an insulation distance from the neutral wire 141 can be ensured.

Slanted surfaces 127a1 and 127b1 are formed on opposing surfaces of the pair of locking protrusions 127a and 127b, respectively. The inclined surfaces 127a1 and 127b1 are formed so that the distance from each other 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 protrusion 127) is arranged 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 126 along the inclined surfaces 127a1 and 127b1. Then, the insulating tube 143 is elastically deformed at the tip portions 127a2, 127b2 of the inclined surfaces 127a1, 127b1, and the power supply wire 142 is accommodated in the bottom of the groove portion 126. Since the distance between the tips 127a2 and 127b2 is narrower than the opening width of the groove 126, it is possible to prevent the power line 142 from slipping out of the groove 126.

The power wire 142 inserted into the groove 126 is wired above the coil 140, and the plurality of power wires 142 are bundled and connected to the connection terminal 150.

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

On the other hand, when considering the moldability of the insulator, LCP material has the highest fluidity and can be injection molded at a lower molding pressure than other materials, but it has the problem of high cost. When using relatively inexpensive PPS or PBT materials, they have poor fluidity, so it is necessary to increase the molding pressure to spread the resin to the end of the thin plate, so the mold part of the molded product burrs are likely to occur on the running line.

In the case of compressor motors, burrs generated on the insulator are usually removed by deburring work, but if burrs are not removed during this process and burrs remain, the motor lead wire may be routed to the location where the burrs are generated. This may damage the enamelled wire coating, or burrs may fall into the refrigerating machine oil inside the compressor container and become lodged in the sliding parts along the oil supply path, significantly reducing the reliability of the compressor. .

If the groove and the locking protrusion are configured to overlap in the mold release direction, the locking protrusion will undercut the groove, making it difficult to move the mold in the rotational axis direction and release the molded product. Can not. Therefore, in molding the locking protrusion, a slide core that is moved in a direction intersecting the direction of the rotation axis is required. When a slide core is used, there are problems in that the cost increases and the number of mold parting lines increases, which increases the number of places where burrs occur.

Means for solving this problem will be explained using FIGS. 8 to 10C. FIG. 10A is a diagram of a locking protrusion and a groove according to Example 1 of the present invention, viewed from the outer peripheral side (radially outer side). FIG. 10B is a layout diagram of the molding die for the insulator when the groove according to the first embodiment of the present invention is viewed from the inner peripheral side (radially inside). FIG. 10C is a layout diagram of a molding die for 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 (radially outside).

As shown in FIG. 10A, when the locking protrusion and the groove are viewed from the outer peripheral side (radially outward), the distance between the tips 127a2 and 127b2 of the inclined surfaces 127a1 and 127b1 (locking protrusion 127) is the opening of the groove 126. The position is such that it is narrower than the width. When molding the insulator 120 with a mold, the distance between the tips 127a2 and 127b2 of the locking protrusion 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 protrusion 127 is provided so as to protrude toward the outer circumferential side (radially outward) from the outer circumferential surface of the outer circumferential wall portion 121a. In other words, as shown in FIG. 9, the groove portion 126 and the locking protrusion 127 are arranged at positions where they do not overlap when viewed from above (rotational axis direction), that is, at positions shifted in the radial direction.

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

The upper mold for forming the groove 126 is formed with a dividing surface so as to follow the shape of the groove 126 .

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

According to the first embodiment, the groove portion 126 and the locking protrusion 127 are arranged at positions shifted in the radial direction when viewed from above (in the direction of the rotation axis), so that the metal moving in the direction of the rotation axis perpendicular to the radial direction Even when the groove portion 126 and the locking protrusion 127 are formed using a mold, undercut portions can be avoided.

According to Example 1, the slide core that moves in the direction crossing the rotation axis direction is no longer required, the structure of the mold is simplified, and the number of work processes is suppressed. can be provided. Further, according to the first embodiment, since a slide core is not required, an increase in the number of mold parting lines can be suppressed, and the occurrence of burrs can be suppressed.

In the first embodiment, the locking protrusion 127 was provided so as to protrude from the outer circumferential surface of the outer circumferential wall portion 121a toward the outer circumferential side (radially outward); It may also be provided so as to protrude toward the inside in the radial direction.

Example 2 of the present invention will be described using FIGS. 11 to 13. FIG. 11 is an enlarged perspective view of the locking protrusion when the upper insulator according to the second embodiment of the present invention is viewed from the outside in the radial direction. FIG. 12 is an enlarged perspective view of the locking protrusion when the upper insulator according to the second embodiment of the present invention is viewed from the inside in the radial direction. FIG. 13 is an enlarged perspective view of a locking protrusion when the upper insulator according to the second embodiment of the present invention is viewed from above. Components that are the same as those in Example 1 are designated by the same reference numerals, and detailed description thereof will be omitted.

In the first embodiment, the locking protrusion 127 was formed to protrude radially outward from the outer peripheral wall 121a of the upper insulator 120a, but in the second embodiment, the locking projection 127 was formed in the outer peripheral wall 121a of the upper insulator 120a. It was formed to protrude upward (in the rotational axis direction) from the upper part of 121a.

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

Slanted surfaces 127c1 and 127d1 are formed on opposing surfaces of the pair of locking protrusions 127c and 127d, respectively. The inclined surfaces 127c1 and 127d1 are formed such that the distance from each other becomes closer from the opening of the groove portion 126 toward the bottom. The distance between the tips 127c2 and 127d2 of the inclined surfaces 127c1 and 127d1 (locking protrusion 127) is narrower than the opening width of the groove 126 (see FIGS. 12 and 13).

The power wire 142 inserted into the insulating tube 143 is inserted into the groove 126 along the inclined surfaces 127c1 and 127d1. Then, as the power line 142 is inserted, the locking protrusions 127c and 127d are elastically deformed to separate from each other, and the insulating tube 143 is elastically deformed at the tips 127c2 and 127d2 of the inclined surfaces 127c1 and 127d1, and the power source Wire 142 fits into the bottom of groove 126. Since the distance between the tips 127c2 and 127d2 is narrower than the opening width of the groove 126, it is possible to prevent the power supply line 142 from slipping out of the groove 126.

Further, the locking projection 127d is formed with a power line support portion 127d3 that protrudes radially outward from the outer peripheral surface of the outer peripheral wall portion 121a. The power line support portion 127d3 protrudes radially outward from the inclined surface 127d1. The power line 142 inserted into the insulating tube 143 is placed on the upper part of the power line support part 127d3 and guided to the groove part 126. Further, the neutral wire 141, which is hung on the outer circumferential surface of the guide protrusion 128, is guided to the lower part of the power line support portion 127d3, and wired while applying tension.

When the upper insulator 120a is viewed from above (rotational axis direction), the inclined surfaces 127c1 and 127d1 of the locking protrusions 127c and 127d are arranged so as to protrude radially outward from the outer circumferential surface of the outer circumferential wall portion 121a. In other words, the groove portion 126 and the inclined surfaces 127c1 and 127d1 are arranged at positions shifted in the radial direction so as not to overlap when viewed from above (rotation axis direction), as shown in FIG.

In molding the insulator 120, two molds facing each other in the direction of the rotation axis are prepared. After the mold is filled with resin and molded, the mold is moved in the direction of the rotation axis and the insulator 120 is released from the mold. At this time, the locking protrusion 127 excluding the groove 126 and the sloped surfaces 127c1 and 127d1 is molded with the upper mold of the mold, and the sloped surfaces 127c1 and 127d1 are molded with the upper mold and the lower mold of the mold.

The upper mold for forming the groove 126 is formed as a split surface so as to follow the shape of the locking protrusion 127 excluding the groove 126 and the inclined surfaces 127c1 and 127d1.

On the other hand, the upper mold and the lower mold for molding the sloped surfaces 127c1 and 127d1 form the positions of the tip portions 127c2 and 127d2 of the sloped surfaces 127c1 and 127d1 as mutual dividing surfaces. Since there is no undercut portion in the upper mold and lower mold for molding the inclined surfaces 127c1 and 127d1, the insulator 120 can be released from the upper mold and the lower mold.

According to the second embodiment, in addition to the effects of the first embodiment, a pair of locking protrusions 127c and 127d are formed on the upper part of the outer peripheral wall portion 121a of the upper insulator 120a, and as the power line 142 is inserted, the locking protrusions 127c , 127d are elastically deformed so as to separate from each other, so that damage to the power supply line 142 caused by the tips 127c2, 127d2 of the inclined surfaces 127c1, 127d1 can be suppressed.

Further, according to the second embodiment, since the groove portion 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 perpendicular to the radial direction is used. Even when the groove portion 126 and the locking protrusion 127 are formed by molding, undercut portions can be avoided.

Furthermore, according to Example 2, a motor that eliminates the need for a slide core that moves in a direction intersecting the direction of the rotation axis, simplifies the structure of the mold, and suppresses an increase in work processes, and a hermetic compressor equipped with this motor. can be provided. Further, according to the second embodiment, since a slide core is not required, an increase in the number of mold parting lines can be suppressed, and the occurrence of burrs can be suppressed.

Note that the present invention is not limited to the embodiments described above, and includes various modifications. The embodiments described above are described in detail to explain the present invention in an easy-to-understand manner, and the present invention is not necessarily limited to those having all the configurations described. For example, although an example of a six-pole, nine-slot electric motor 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 a scroll compressor, and can also be applied to a hermetic electric compressor such as a rotary compressor or a reciprocating compressor. In the embodiment described above, the upper insulator with the features of the present invention and the lower insulator without the features of the present invention were of different shapes, but in order to share the mold, the lower insulator was made of the same shape as the upper insulator. may also be used.

1... Scroll compressor, 2... Fixed scroll, 2s... Suction port, 3... Orbiting scroll, 4... Frame, 6... Crankshaft, 6a... Eccentric part, 6b... Oil supply hole, 6x... Oil supply pipe, 7... Main bearing, 8...Casing, 9...Suction pipe, 10...Electric motor, 10a...Stator, 10b...Rotor, 11...Fixed back chamber, 12...Oil storage section, 13...Back pressure chamber, 14...Swivel bearing, 15...Discharge pipe, 110... Stator core, 111...Yoke part, 112...Teeth part, 112a...Upper side, 112b...Lower side, 113...Teeth tip, 114...Slot, 114a, 114b...Enlarged slot part, 120...Insulator, 120a...Upper insulator, 120b ...Lower insulator, 121a, 121b...Outer peripheral wall part, 122a, 122b...Teeth covering part, 122a1, 122b1...Teeth covering part side wall, 123a, 123b...Teeth tip covering part, 124...Neutral point terminal block, 125...Protrusion part , 126... Groove portion, 127, 127a, 127b, 127c, 127d... Locking protrusion, 127a1, 127b1, 127c1, 127d1... Inclined surface, 127a2, 127b2, 127c2, 127d2... Tip portion, 127d3... Power line support portion, 128... Guide protrusion, 130... Slot insulating paper, 140... Coil, 141... Neutral wire, 142... Power line, 143... Insulating tube, 150... Connection terminal

Claims (6)

comprising a stator and a rotor rotating inside the stator,
The stator includes a stator core and an insulator that covers the stator core,
An electric motor in which a coil is wound around a plurality of teeth formed in the stator core via the insulator,
The outer circumferential wall of the insulator includes a neutral point terminal block to which the neutral wire of the coil is connected, a groove having an opening in the direction of the rotation axis and into which the power wire of the coil is inserted, and a groove that is inserted into the groove. a pair of locking protrusions that prevent the power supply wire from coming off, a protrusion that protrudes from the outer circumferential wall of the insulator in the rotational axis direction, and a protrusion that protrudes radially outward from the outer circumferential surface of the outer circumferential wall of the insulator. and a guide protrusion formed between the neutral point terminal block and the protrusion at a circumferential position,
The pair of locking protrusions and the groove are arranged at positions shifted in the radial direction when viewed from the rotation axis direction ,
The neutral wire is guided to the outer peripheral wall of the insulator, hung on the outer peripheral surface of the guide protrusion, and then connected to the neutral point terminal block,
The electric motor , wherein the power line is wound around the protrusion and then guided into the groove . In claim 1,
The pair of locking protrusions are formed to protrude radially outward from the outer circumferential surface of the outer circumferential wall of the insulator, or to protrude radially inward from the inner circumferential surface of the outer circumferential wall of the insulator. An electric motor characterized by: In claim 1 or 2,
The electric motor is characterized in that the pair of locking protrusions are provided with inclined surfaces that are formed such that the distance becomes closer from the opening of the groove toward the bottom. In claim 3,
The electric motor is characterized in that the distance between the tips of the inclined surfaces is narrower than the opening width of the groove. comprising a stator and a rotor rotating inside the stator,
The stator includes a stator core and an insulator that covers the stator core,
An electric motor in which a coil is wound around a plurality of teeth formed in the stator core via the insulator,
The outer circumferential wall of the insulator includes a neutral point terminal block to which the neutral wire of the coil is connected, a groove having an opening in the direction of the rotation axis and into which the power wire of the coil is inserted, and a groove that is inserted into the groove. a pair of locking protrusions that prevent the power supply wire from coming off, a protrusion that protrudes from the outer circumferential wall of the insulator in the rotational axis direction, and a protrusion that protrudes radially outward from the outer circumferential surface of the outer circumferential wall of the insulator. and a guide protrusion formed between the neutral point terminal block and the protrusion at a circumferential position,
The pair of locking protrusions are formed to protrude from the rotation axis direction of the insulator so as to sandwich the groove,
The pair of locking protrusions include inclined surfaces formed such that the distance from each other decreases from the opening of the groove toward the bottom,
The inclined surface and the groove are arranged at positions shifted in the radial direction when viewed from the rotation axis direction ,
The neutral wire is guided to the outer peripheral wall of the insulator, hung on the outer peripheral surface of the guide protrusion, and then connected to the neutral point terminal block,
The electric motor , wherein the power line is wound around the protrusion and then guided into the groove . A hermetic electric compressor comprising: a compression mechanism that compresses a working fluid; an electric motor that drives the compression mechanism; and a casing that includes 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 5 .

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