JP7312967B2 - Stator, motor and compressor - Google Patents

Description

The present invention relates to stators, motors and compressors equipped with insulators for insulating stator cores and windings.

In a stator employing a nozzle winding technique in which the winding is wound around teeth of the stator through a nozzle through which the winding is passed, the winding start portion of the winding is pressed against the wall of the insulator by the winding wound thereafter.

As a result, stress is applied to the winding start portion of the winding, and the insulation film of the winding is damaged, making it impossible to maintain insulation, and in the worst case, there is a risk of wire breakage.

Therefore, in a conventional stator provided with an insulator, a notch is provided in the wall of the insulator so that the winding start portion of the winding is passed through the outer diameter side of the insulator wall portion so that stress is not applied to the winding start portion of the winding (see Patent Document 1).

Japanese Patent No. 5529073

However, in the conventional configuration, the winding start portion of the winding passes through the notch of the insulator and is connected on the outer diameter side of the wall portion of the insulator, so that the closed container of the compressor and the winding come closer, so there is a problem that the leakage current increases.

The present invention provides a stator, a motor, and a compressor capable of reducing leakage current between the windings and the closed container of the compressor while having a configuration in which no stress is applied to the winding start portion of the windings.

A stator according to the present invention includes a stator core having an annular stator core yoke portion and a plurality of stator core teeth arranged on the inner peripheral side of the stator core yoke portion. An annular wall provided on the stator core yoke, a plurality of insulator teeth arranged on the inner peripheral side of the annular wall, and an insulator provided on the annular wall and having a groove into which the winding start portion of the winding is inserted when the winding is wound around the insulator teeth . Furthermore, the grooves are provided upward from the insulator tooth portion to a position a predetermined distance away from the apex of the annular wall portion without being provided to the apex of the annular wall portion, a notch is formed at a predetermined distance from the apex of the annular wall portion, and the winding start portion of the winding has a connection portion that connects a plurality of wires while maintaining insulation from the winding through an insulating tube for connection. It is fixed with a tying string and connected to a power supply terminal for a power supply winding. Furthermore, the winding start portion of the winding is connected on the inner diameter side of the annular wall portion, the connection portion is positioned on the inner diameter side of the annular wall portion, and the winding is connected on the inner diameter side of the annular wall portion.

With this configuration, no stress is applied to the winding start portion of the winding, so the winding can be separated from the sealed container of the compressor while maintaining the winding quality, and leakage current can be reduced.

FIG. 1 is a longitudinal sectional view of a compressor according to a first embodiment of the invention. FIG. 2 is a top view of the stator of the compressor according to the first embodiment of the invention. FIG. 3A is a perspective view showing the stator of the compressor before winding according to the first embodiment of the present invention. 3B is a perspective view showing the stator of the compressor after winding according to the first embodiment of the present invention. FIG. FIG. 4 is an assembly drawing of the stator core and insulator of the compressor according to the first embodiment of the present invention. FIG. 5 is an enlarged view of the insulator of the compressor according to the first embodiment of the present invention. FIG. 6A is a detailed view of the insulator groove portion of the compressor according to the first embodiment of the present invention. 6B is a cross-sectional view taken along line 6B-6B of FIG. 6A.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the present invention is not limited by this embodiment.

(First embodiment)
<Overall configuration of compressor>
First, the configuration of the compressor according to the first embodiment will be described with reference to FIG.

FIG. 1 is a longitudinal sectional view of a compressor according to a first embodiment of the invention.

As shown in FIG. 1, the compressor of the present embodiment includes a closed container 1, and a compression mechanism section 102 and a motor 103 arranged inside the closed container 1. As shown in FIG.

<Compression mechanism>
The compression mechanism section 102 includes a main bearing member 104 , a fixed scroll 106 and an orbiting scroll 107 .

The main bearing member 104 is fixed inside the sealed container 1 by welding or shrink fitting, and this main bearing member 104 pivotally supports the shaft 105 . A fixed scroll 106 is bolted onto the main bearing member 104 . An orbiting scroll 107 meshing with the fixed scroll 106 is sandwiched between the fixed scroll 106 and the main bearing member 104 . That is, the compressor in this embodiment is a scroll compressor.

Between the orbiting scroll 107 and the main bearing member 104, there is provided a rotation restraint mechanism 108 including an Oldham ring that prevents the orbiting scroll 107 from rotating and guides the orbiting scroll 107 to move in a circular orbit. By eccentrically driving the orbiting scroll 107 with the eccentric shaft portion 105a at the upper end of the shaft 105, the orbiting scroll 107, whose rotation is prevented by the rotation restraint mechanism 108, moves in a circular orbit.

Due to the operation of the orbiting scroll 107 described above, the compression chamber 109 formed between the fixed scroll 106 and the orbiting scroll 107 moves from the outer peripheral side toward the central portion while reducing the volume. Using this movement, the refrigerant gas is sucked into the sealed container 1 from the suction pipe 110 connected to the refrigeration cycle outside the closed container 1 through the suction chamber 111 provided in the fixed scroll between the suction pipe 110 and the compression chamber 109 and always at the suction pressure. Refrigerant gas sucked into the sealed container 1 is confined in the compression chamber 109 and then compressed. The refrigerant gas that reaches a predetermined pressure pushes open the reed valve 113 from the discharge port 112 at the center of the fixed scroll 106 and is discharged into the muffler space 114 formed inside the muffler 116 .

The refrigerant gas discharged into the muffler space 114 passes through the container inner space 115 of the closed container 1 and is delivered from the discharge pipe 117 to the refrigerating cycle outside the closed container 1 .

In addition, in this embodiment, the R32 refrigerant is used as the refrigerant.

On the other hand, the shaft 105 for orbiting the orbiting scroll 107 is provided with a pump 118 at its lower end, and the suction port of the pump 118 is arranged in an oil reservoir 119 provided at the bottom of the sealed container 1. Since the pump 118 is driven simultaneously with the scroll compressor, the pump 118 can reliably suck up the oil in the oil reservoir 119 provided at the bottom of the closed container 1 regardless of pressure conditions and operating speed. The oil sucked up by the pump 118 is supplied to the compression mechanism portion 102 through an oil supply hole 120 penetrating through the shaft 105 . If foreign matter is removed from the oil with an oil filter or the like before or after the oil is sucked up by the pump 118, contamination of the compression mechanism 102 with foreign matter can be prevented, and reliability can be improved.

<Motor>
The motor 103 is provided inside the sealed container 1 to drive the compression mechanism section 102, and has a rotor 121 and a stator 2 arranged radially outside the rotor 121 with an air gap therebetween.

<Rotor>
The rotor 121 has a core (not shown) and a plurality of permanent magnets (not shown).

The core is formed by stacking a plurality of thin plates made of a metal material and joining the stacked thin plates together by welding or the like.

Further, the core has a substantially circular through-hole in a plan view at substantially the center thereof. A shaft 105 is inserted into the through hole, and the magnetic force generated between the rotor 121 and the stator 2 causes the shaft 105 to rotate together with the rotor 121 .

In the present embodiment, the scroll compressor has been described, but the present invention can also be applied to, for example, a rotary compressor and other compressors.

Also, in the present embodiment, the R32 refrigerant is used as the refrigerant, but the present invention is also applicable to, for example, R410A refrigerant and other refrigerants.

The stator 2 will be described in detail below.

<Stator>
FIG. 2 shows a top view of the stator in the first embodiment of the invention.

In FIG. 2 , a stator 2 fixed to a closed container 1 that constitutes a compressor includes a stator core 21 and insulators 22 arranged above and below the stator core 21 .

Here, as shown in FIG. 4, the stator core 21 has an annular stator core yoke portion 21a and a plurality of stator core teeth portions 21b arranged on the inner peripheral side of the stator core yoke portion 21a.

3A and 3B, the insulator 22 has an annular wall portion 22a provided on the stator core yoke portion 21a, a plurality of insulator teeth portions 22b arranged on the inner peripheral side of the annular wall portion 22a, and a groove 22c provided in the annular wall portion 22a for receiving the winding start portion 23a of the winding when the winding is wound around the insulator tooth portion 22b.

Moreover, the winding start portion 23a of the winding passes through the insulation tube 28a for connection, and has a connection portion 28 that connects a plurality of windings while maintaining insulation from the windings 23 wound on the stator core teeth portion 21b and the insulator teeth portion 22b.

Here, the connection portion 28 is positioned on the inner diameter side with respect to the annular wall portion 22a.

In addition, the winding start portion 23a of the winding collected by the connection portion 28 passes through an insulating tube 25 for insulating between different phases when the winding 23 is pulled out, is fixed by a binding thread 24 for fixing the winding, and is connected to a power supply terminal 26 for the power supply winding.

Note that, in the present embodiment, the groove 22c provided in the annular wall portion 22a is not a notch as described in Patent Document 1, but a recess having a predetermined depth provided in the inner surface of the annular wall portion 22a.

In this way, the groove 22c is not a notch but a concave portion having a predetermined depth, so that an insulating distance can be secured from the winding (winding end portion) connected at the outer diameter portion of the annular wall portion 22a, and a breakdown voltage failure can be prevented.

In addition, when the groove 22c is a notch, the insulating distance can be secured by increasing the height of the annular wall portion 22a, but the material for the insulator is required, which increases the cost.

Further, the grooves 22c are provided upward from the insulator teeth portion 22b, not to the apex of the annular wall portion 22a, but to a position a predetermined distance away from the apex of the annular wall portion 22a.

FIG. 3A shows a perspective view of the stator before winding, and FIG. 3B shows a perspective view of the stator after winding.

FIG. 4 is a perspective view of an assembly drawing of the insulator 22 and the stator core 21. As shown in FIG. FIG. 5 is an enlarged view of the insulator 22. FIG. FIG. 6 is an enlarged view of an insulator groove.

As shown in FIG. 3A, the insulator 22 is arranged above the stator core 21, and the insulator 22 is composed of an insulator tooth portion 22b, an annular wall portion 22a arranged on the stator core yoke portion 21a, a lateral wall portion 22d of the insulator tooth portion 22b, and a groove 22c for receiving the winding start portion 23a of the winding.

Further, as shown in FIGS. 3A and 5, the grooves 22c are arranged in the vicinity of straight lines on the ends of the lateral wall portions 22d of the insulator tooth portions 22b.

With this configuration, the winding start portion of the winding can be prevented from being shifted, and the wire connection can be performed with high accuracy.

Also, the "groove width" of the groove 22c shown in FIG.

As a result, the winding start part of the winding can be easily accommodated in the groove, the displacement of the winding start part can be prevented, and stress is not applied to the winding start part of the winding, so that the winding can be separated from the sealed container 1 of the compressor while maintaining the winding quality, and the leakage current can be reduced.

Further, as shown in FIG. 6B, the “groove depth” of the groove 22c is set to be equal to or greater than the radius of the winding 23. As shown in FIG.

As a result, the winding can be accommodated by more than half of the depth of the groove, the deviation of the winding start portion of the winding can be prevented, and since stress is not applied to the winding start portion of the winding, the winding can be separated from the sealed container 1 of the compressor while maintaining the winding quality, and the leakage current can be reduced.

Moreover, as shown in FIG. 6B, the groove 22c has a tapered shape in which the "groove depth" becomes shallower toward the insulator tooth portion 22b.

With this configuration, the winding start portion of the winding can be prevented from shifting, and the strength of the base of the annular wall portion 22a of the insulator 22 can be maintained.

In addition, although not shown, an insulating film made of polyethylene terephthalate is arranged on inner diameter side surfaces of the yoke portion and the tooth portion.

Winding 23 is wound as shown in FIGS. 2 and 3B.

The operation and action of the stator 2 configured as described above will be described below.

First, when the winding is wound around the insulator tooth portion 22b, the winding is wound after the winding start portion 23a is placed in the groove 22c, so that the winding start portion 23a is sandwiched between the annular wall portion 22a and the winding 23 wound on the insulator tooth portion 22b, so that the winding can be wound without applying stress.

In other words, the connection portion 28, which combines the plurality of winding start portions, is positioned on the inner diameter side with respect to the annular wall portion 22a.

After that, the wire connection process is performed on the inner diameter side of the annular wall portion 22a, so that the wire can be arranged apart from the sealed container 1. FIG.

As described above, in the present embodiment, by providing the insulator 22 constituting the stator 2 with the groove 22c for receiving the winding start portion 23a of the winding, it is possible to maintain the quality of the winding without applying stress to the winding start portion 23a of the winding.

In the configuration of the present embodiment shown in FIGS. 3A and 5, the groove 22c for receiving the winding start portion 23a of the winding is arranged on the left side of the insulator tooth portion 22b, but the same effect can be expected even if the groove 22c for receiving the winding start portion 23a is arranged on the right side of the insulator tooth portion 22b.

The compressor of the present embodiment can be applied to room air conditioners, dehumidifiers, heat pump water heaters, refrigerators, showcases, air conditioners, refrigeration equipment, and the like.

As described above, the stator in the first disclosure includes a stator core having an annular stator core yoke portion and a plurality of stator core teeth arranged on the inner peripheral side of the stator core yoke portion. The insulator has an annular wall portion provided on the stator core yoke portion, a plurality of insulator teeth portions arranged on the inner peripheral side of the annular wall portion, and grooves into which the winding start portion of the winding provided on the annular wall portion enters when the winding is wound around the insulator tooth portion. Furthermore, the winding start portion of the winding is connected on the inner diameter side of the annular wall portion.

With this configuration, no stress is applied to the beginning of the winding. Therefore, it is possible to separate the windings from the closed container of the compressor while maintaining the quality of the windings, thereby providing a stator capable of reducing leakage current.

In the stator according to the second disclosure, in the first disclosure, the groove into which the winding start portion of the winding is to be placed may be arranged in the vicinity of the straight line of the lateral wall portion of the insulator tooth portion.

With this configuration, the winding start portion of the winding can be prevented from being shifted, and stress is not applied to the winding start portion of the winding, so the winding can be separated from the closed container of the compressor while maintaining the winding quality, and leakage current can be reduced.

In the stator according to the third disclosure, in either the first disclosure or the second disclosure, the width of the groove into which the winding start portion of the winding is placed may be equal to or greater than the diameter of the winding and equal to or less than the diameter of the winding + 3 mm.

With this configuration, the winding start portion of the winding can be easily accommodated in the groove, the displacement of the winding start portion of the winding can be prevented, and stress is not applied to the winding start portion of the winding. Therefore, the winding can be separated from the closed container of the compressor while maintaining the quality of the winding, and the leakage current can be reduced.

In the stator according to the fourth disclosure, in any one of the first disclosure to the third disclosure, the depth of the groove into which the winding start portion of the winding is placed may be set to be greater than or equal to the radius of the winding.

With this configuration, the winding can be accommodated by more than half of the depth of the groove, so that the winding start portion of the winding can be prevented from being displaced, and no stress is applied to the winding start portion of the winding. Therefore, the winding can be separated from the closed container of the compressor while maintaining the quality of the winding, and the leakage current can be reduced.

In the stator according to the fifth disclosure, in any one of the first disclosure to the fourth disclosure, the groove into which the winding start portion of the winding is placed may be tapered toward the insulator tooth portion.

With this configuration, the winding start portion of the winding can be prevented from being displaced, and no stress is applied to the winding start portion of the winding. Therefore, the winding can be separated from the closed container of the compressor while maintaining the quality of the winding, and the leakage current can be reduced.

Further, it is possible to prevent the winding start portion of the winding from shifting, and to maintain the strength of the base of the annular wall portion of the insulator.

The motor according to the sixth disclosure may comprise the stator according to any one of the first disclosure to the fifth disclosure, and a rotor arranged inside the stator.

With this configuration, it is possible to separate the windings from the closed container of the compressor while maintaining the quality of the windings, thereby providing a motor capable of reducing leakage current.

The compressor in the seventh disclosure may comprise the motor in the sixth disclosure.

With this configuration, it is possible to separate the windings from the closed container of the compressor while maintaining the quality of the windings, thereby providing a compressor capable of reducing leakage current.

INDUSTRIAL APPLICABILITY By using the present invention, it is possible to obtain a stator, a motor, and a compressor capable of improving winding quality of coils and reducing leakage current.

1 Sealed Container 2 Stator 21 Stator Core 21a Stator Core Yoke Part 21b Stator Core Teeth Part 22 Insulator 22a Annular Wall Part 22b Insulator Teeth Part 22c Groove 22d Lateral Wall Part 23 Winding 23a Winding Start Part 23b Winding After Winding 24 Binding Thread 25 Insulating Tube 26 Power Supply Terminal 28 Connection portion 102 Compression mechanism portion 103 Motor 104 Main bearing member 105 Shaft 106 Fixed scroll 107 Orbiting scroll 108 Rotation restraint mechanism 109 Compression chamber 110 Suction pipe 111 Suction chamber 112 Discharge port 113 Reed valve 114 Muffler space 115 Inner space 116 Muffler 117 Discharge pipe 118 Pump 119 Oil reservoir 120 Oil supply hole 121 Rotor

Claims (7)

an annular stator core yoke portion;
and a stator core having a plurality of stator core tooth portions arranged on the inner peripheral side of the stator core yoke portion;
an annular wall portion provided on the stator core yoke portion;
a plurality of insulator teeth arranged on the inner peripheral side of the annular wall;
and an insulator having a groove formed on the annular wall into which a winding start portion of the winding is inserted when the winding is wound around the insulator teeth;
with
A stator fixed to a closed container that constitutes a compressor,
The grooves are provided upward from the insulator tooth portion to a position separated by a predetermined distance from the apex of the annular wall portion without being provided to the apex of the annular wall portion,
a notch is formed at the predetermined distance from the vertex of the annular wall;
The winding start portion of the winding has a connection portion that connects a plurality of windings while maintaining insulation from the winding through a connection insulating tube,
The winding start portion of the winding united by the connection portion passes through an insulating tube for insulating between different phases when the winding is pulled out, is fixed with a binding thread that fixes the winding, and is connected to a power supply terminal for a power supply winding.
The winding start portion of the winding is connected on the inner diameter side of the annular wall portion ,
The connection portion is positioned on the inner diameter side with respect to the annular wall portion,
The wire connection process of the winding is performed on the inner diameter side of the annular wall portion.
stator. 2. The stator according to claim 1, wherein the groove into which the winding start portion of the winding is inserted is arranged in the vicinity of a straight line of the lateral wall portion of the insulator tooth portion. 3. The stator according to claim 1, wherein the width of the groove into which the winding start portion of the winding is inserted is equal to or greater than the diameter of the winding and equal to or less than the diameter of the winding plus 3 mm. 4. The stator according to any one of claims 1 to 3, wherein the depth of the groove into which the winding start portion of the winding enters is greater than or equal to the radius of the winding. 5. The stator according to any one of claims 1 to 4, wherein grooves into which the winding start portions of the windings are inserted are tapered toward the insulator tooth portions. A motor comprising the stator according to any one of claims 1 to 5 and a rotor arranged inside the stator. A compressor comprising the motor according to claim 6 .

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