JP2005133585A - Hermetic electric compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure reliability without baring improvement of efficiency of a motor by ensuring fixing of an insulating material between phases inserted between windings of a stator of a motor of a concentrated winding type and ensuring insulation between windings. <P>SOLUTION: Insulation between windings is surely performed and the insulating material between phases is surely fixed by inserting I-shaped, T-shaped insulating material between phases between stator winding phases and hooking a projection provided on the insulating material between phases on a stator. If S-shaped insulating material between phases is used, the insulating material between phases can be fixed by inserting an S-shaped end part between stator winding and the stator. The insulating material between phases can be fixed surer by making a notch on an end part in a piling thickness direction or folding back a slot opening part of slot insulating paper. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a hermetic electric compressor equipped with an electric motor wound by a concentrated winding method.

  As a means for reducing the power consumption of the electric compressor, there is concentrated winding of the motor stator winding method. In the concentrated winding method, the winding is wound directly on the stator core via an insulating material. Therefore, compared to the distributed winding method, the winding length can be shortened and the winding resistance can be reduced, resulting in reduced copper loss. Power consumption can be suppressed. On the other hand, the stator wound by the distributed winding method has only one phase winding inserted into one slot, but the stator wound by the concentrated winding method is wound around adjacent teeth 2. Since the windings of one phase fit in one slot, it is necessary to provide insulation between windings of different phases adjacent to each other in each slot. As a method of insulation, the space factor of the winding is reduced by designing the wire diameter of the winding to be thin and the number of turns to be small so that a sufficient space insulation distance between the windings in the slot and an interphase insulation distance are obtained. It was secured. On the other hand, since it is desirable that the space factor is large in order to increase the efficiency of the electric motor, the above insulating means has hindered the increase in efficiency.

  In addition, an electric compressor having a permanent magnet in the rotor, and a winding that magnetizes the permanent magnet by passing an instantaneous large current through the stator winding in a state where the stator and the rotor are incorporated in the compressor. When the magnetizing method is used, there is a possibility that the windings are violently collided by the large current, resulting in damage to the coating of the windings, leading to insulation failure. In particular, when a rare earth magnet with a high magnetic flux density is used as a permanent magnet of a stator in order to increase the effect of improving the efficiency of the motor, a large amount of energy is required to magnetize the permanent magnet. There was a possibility of a rare short.

  As a first known example for solving the above-mentioned problem, a tube-shaped insulating material is put on the winding end portion of the winding, and the tube-shaped insulating material is arranged so as to partition the windings in the slot. As a second known example, in order to insulate only the lead wire welded portion, an insulating material that is usually covered on the welded portion is inserted between the windings in the slot, and the insulation between the lead wire welded portion and the winding There is a method that doubles as insulation.

  Without interphase insulation between the stator windings, reducing the space factor of the windings and securing the distance between the stator windings hinders high efficiency, and the permanent magnet of the stator In the case of magnetizing by winding magnetism, there is a problem in reliability because there is a possibility that the stator winding may suddenly break due to a large current at the time of magnetization and the coating of the winding may be damaged. For this reason, it is essential to provide an interphase insulating material between the stator windings so as not to hinder the high efficiency of the electric motor and to reduce the reliability even when the winding is magnetized.

  The first publicly known example of the prior art has a problem that workability is deteriorated because the winding must be passed through the tubular insulating material in the middle of the winding although the fixing of the insulating material is reliable. In the second known example of the prior art, it is easy to insert the interphase insulating material, but the fixing property of the insulating material is obtained by inserting it in a narrow gap between the windings. The magnitude of the fixing force varies depending on the size of the gap between them. When the space factor of the winding is not high, a sufficient fixing force of the insulating material cannot be obtained, and the insulating material may be displaced or dropped.

  According to the present invention, it is possible to easily attach the interphase insulating material and securely fix the interphase insulating material.

  A flat interphase insulating material is inserted between the windings in the stator slot, and the interphase insulating material is an I-shaped insulating film having protrusions extending in the outer diameter direction of the stator and the central direction at both ends in the stacking direction. There is provided a hermetic electric compressor equipped with a stator having a structure in which the protruding portion is hooked to the end of the stator.

  In addition, a flat interphase insulating material is inserted between the windings in the stator slot, and the interphase insulating material is provided with a protruding portion extending in the outer diameter direction and the central direction of the stator at one end portion in the stacking direction. A hermetic electric compressor including an insulating film and a stator having a structure in which the protruding portion is hooked to the end of the stator is provided.

  Further, a flat interphase insulating material is inserted between the stator slot windings, and both end portions of the interphase insulating material in the stator cross section are between the stator winding and the slot outer diameter, and between the stator winding and the slot. The length of the interphase insulating material in the stator cross-section direction is longer than the slot depth dimension connecting the slot opening and the outermost diameter portion of the slot, and the slot is bent in an S shape. A hermetic electric compressor is mounted with a stator inserted between the inner stator windings.

  Further, in the stator of the hermetic compressor having the S-shaped interphase insulating material, the S-shaped interphase insulating material has a notch at the end of the stator cross-sectional direction in the stator stacking direction, and is folded back from the notch. A hermetic electric compressor including a stator having a structure in which an interphase insulating material is hooked on the stator is provided.

  Further, a hermetic compressor having the S-shaped interphase insulating material, wherein the slot insulating paper has a stator that has a folding back in the direction opposite to the opening at the slot opening, and To do.

  By using the interphase insulating material of the present invention for a concentrated winding stator of an electric compressor, insulation between the windings in the slot can be reliably performed without reducing the efficiency of the electric motor. Even when a permanent magnet of the rotor is magnetized by passing a large current, it is possible to prevent a decrease in reliability due to dielectric breakdown. By providing the interphase insulating material with the fall prevention shape of the present invention, it is possible to reliably prevent the interphase insulating material from dropping even when the space factor of the winding is low. Further, the creeping insulation distance between the windings can be easily ensured by bending the interphase insulating material into an S shape.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  1 is a hermetic electric compressor of the present invention, FIG. 2 is a horizontal sectional view, FIG. 3 is a stator for an electric motor mounted on the hermetic electric compressor, and FIGS. 5 to 6 are conventional embodiments of interphase insulation. 7 to 15 show an embodiment of the present invention.

  FIG. 1 shows a hermetic electric compressor according to the present invention.

  The hermetic type electric compressor includes a rotary type, a scroll type, a piston rod type, and the like, and will be described by using an example of a scotch yoke type hermetic type electric compressor.

  The compression mechanism part 3 is arranged in the upper part of the sealed container 2 and the electric motor part 4 is arranged in the lower part. The stator 13 of the electric motor 12 is fixed to the frame 5 with bolts 10, and the rotor 14 and the shaft 6 are press-fitted. These are connected by a shrink fit, and these are elastically supported in the sealed container 2 by a spring 11. When the hermetic electric compressor configured as described above is driven by the electric motor 11, the eccentric rotation of the crankshaft 6 supported by the rotor 14 causes the piston 7 to reciprocate, and the cylinder 8 The refrigerant gas is sucked in, compressed, and discharged.

  The hermetic electric compressor 1 configured as described above is used in refrigerators and air conditioners.

  Here, a six-slot concentrated winding motor will be described as an embodiment of the present invention. As shown in FIG. 3, the stator core 15 forms six slots 17, and a slot insulating paper 18 is inserted into each slot 17, and the stator winding 16 is connected to the stator core 15 via the slot insulating paper 18. It is wound directly and a wedge 19 is inserted between the opening of the slot 17 and the stator winding 16 as necessary. In the stator wound by such a concentrated winding method, the windings 16 having different phases are wound around the adjacent teeth 23, and the windings 16 having different phases are mixed into one slot 17. The stator winding 16 wound around the stator core 15 is welded to the lead wire 24, and power can be supplied to the motor from the terminal 25 provided in the hermetic electric compressor through the lead wire 24. Usually, the connecting portion 26 between the lead wire 24 and the stator winding 16 is covered with a connecting portion insulating material 27 and is bound and fixed on the winding at the end of the stator by a lacing yarn 28 or the like.

  In this embodiment, a permanent magnet is embedded in the iron core of the rotor 14 in order to increase the efficiency of the electric motor, and the permanent magnet is magnetized in a state where the stator 13 and the rotor 14 are incorporated in the compressor. This is done by flowing a large current through the stator winding 16. When the permanent magnet in the rotor 14 is preliminarily magnetized and incorporated in the airtight container 2 of the compressor, the assembling workability of the stator 13 and the rotor 14 deteriorates due to the magnetic attractive force. Since there is a problem that iron powder or the like may adhere to the compressor and cause a compressor operation failure, as described above, the permanent magnet of the rotor 14 is magnetized with the stator 13 and the rotor. 14 is carried out in a state of being incorporated in the hermetic container 2 of the compressor.

  As described above, in the stator 13 wound by the concentrated winding method, the stator windings 16 having different phases are mixed in the slots 17, so that it is necessary to provide insulation between the windings.

  Examples of conventional insulation will be described with reference to FIGS.

  FIG. 4 shows a method of insulation by lowering the space factor of the stator 16 windings and ensuring the insulation distance between the windings in the slot 17, but there is a problem that hinders the efficiency improvement of the motor. It was. In addition, when the winding is magnetized, the stator winding 16 may be violated by an instantaneous large current, and the coating of the winding may be damaged.

  FIG. 5 shows a method of insulating by placing a tubular interphase insulating material 20a on the winding end portion of the stator winding 16, and arranging the tubular insulating material 20a so as to partition between the windings in the slot 17. Show. In this embodiment, the interphase insulating material 20a is fixed securely, but the stator winding 16 must be passed through the tube-shaped insulating material in the middle of the winding, resulting in poor workability.

  FIG. 6 shows a method in which an insulating material 22 to be applied to the welded portion 21 is inserted between the windings in the slot so as to insulate only the lead wire connecting portion 21 and serve as both insulation of the lead wire welded portion and insulation between the windings. Is shown. In this embodiment, the insulating material 22 can be easily inserted, but the fixing property of the insulating material 22 is obtained by inserting it in a narrow gap between the windings, and the gap between the windings is large. Thus, the magnitude of the fixing force changes. When the space factor of the stator winding 16 is not high, a sufficient fixing force of the insulating material 22 cannot be obtained, and the insulating material 22 may be displaced or dropped.

  In the first embodiment of the present invention that solves the above problem, an I-shaped interphase insulating material 20b as shown in FIG. Insulation can be performed reliably and the interphase insulating material 20b can be reliably prevented from falling. 8 is a view showing a state in which an I-shaped interphase insulating material 20c is inserted between the windings 16 in the slot 17, and FIG. 9 is a cross-sectional view of the interphase insulating material portion between the windings in FIG. As shown in FIG. 9, by using the I-shaped interphase insulating material 20c, it is possible to reliably prevent the interphase insulating material from shifting in both axial directions. At this time, in the case where the displacement and dropping directions of the interphase insulating material are limited to only one direction, a T-shaped interphase insulating material as shown in FIG. 10 may be used.

  Explaining an example in which the above-described T-shaped interphase insulating material may be used, for example, as shown in FIG. 3, the lead wire, the lead wire of the stator winding, and the insulating material for the lead wire connecting portion are arranged on the stator slot in the circumferential direction. In the case where they are drawn and fixed firmly by a lacing yarn or the like, these fixed objects can prevent the interphase insulating material from shifting and dropping, so that it can be prevented from shifting to the opposite side and falling. A character-shaped interphase insulating material may be used.

  In the second embodiment of the present invention, a flat interphase insulating material is curved between the windings 16 in the slot 17 in an S shape as shown in FIG. By inserting and inserting both ends of the S shape between the stator winding 16 and the slot insulating paper 18, the interphase insulating material 20d can be firmly fixed. At this time, by taking the length of the S-shaped portion sufficiently longer than the slot depth dimension, the fixing force can be increased by adding the elastic force of the insulating material itself. In addition, as shown in FIG. 12, the interphase insulating material 20d is inserted in an S-shape so that the creepage distance between the windings 16 can be increased, and the insulation distance can be ensured more reliably. be able to. Further, as shown in FIGS. 13 and 14, an S-shaped interphase insulating material having a notch at the end portion is inserted between the windings in the slot, and the interphase insulating material is hooked on the folded stator from the notch. It is possible to reliably prevent 20e from shifting and dropping, and further improve the reliability. Although FIG. 13 has a total of four cuts, two at each end in the stacking direction, if there is only one direction of misalignment and dropping of interphase insulation, cut two at the end on one side in the stacking direction. You can just put it in.

  A third embodiment of the present invention is shown in FIG. A slot insulating paper is provided in the slot 17 of the stator core 16, and the slot insulating paper 18b is folded back to the opposite side of the opening in the slot opening. The provision of the wrapping is effective in securing an insulation distance between the stator winding and the stator core of the slot opening, particularly in the stator not using the wedge as shown in FIG. 15 for example, even when the S-shaped interphase insulating material is inserted in a state of being biased toward the back of the slot as shown in FIG. 15, the folded portion of the slot insulating paper is formed so that the S-shaped interphase insulating material has the slot opening. At the same time, it plays the role of preventing the part from falling off. At this time, the interphase insulating material combined with the folded slot insulating paper 18b may be the notched S-shaped interphase insulating material of FIG. 11 or the notched S-shaped interphase insulating material of FIG.

The figure which shows a hermetic type electric compressor. The horizontal sectional view of FIG. Explanatory drawing which shows the winding structure of a stator. The figure which shows the example of insulation between the windings by a low space factor. The figure which shows the conventional Example. The figure which shows the conventional Example. The figure which shows the I-shaped interphase insulating material which is 1st embodiment of this invention. Explanatory drawing of the insulation by an I-shaped interphase insulating material. FIG. 9 is a cross-sectional view of FIG. 8. The figure which shows a T-shaped interphase insulating material. The figure which shows the S-shaped interphase insulating material which is 2nd embodiment of this invention. Explanatory drawing of the insulation by a S-shaped interphase insulating material. The figure which shows the S-shaped interphase insulating material with a notch. Explanatory drawing of the insulation by the S-shaped interphase insulating material with a notch. Explanatory drawing of the insulation by the S-shaped interphase insulating material with a notch which is 3rd embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Sealed type electric compressor, 2 ... Sealed container, 3 ... Compressor mechanism part, 4 ... Electric motor part, 5 ... Frame, 6 ... Shaft, 7 ... Piston, 8 ... Cylinder, 9 ... Head cover, 10 ... Bolt, DESCRIPTION OF SYMBOLS 11 ... Spring, 12 ... Electric motor, 13 ... Stator, 14 ... Rotor, 15 ... Stator iron core, 16 ... Stator winding, 17 ... Slot, 18 ... Slot insulation paper, 19 ... Wedge, 20 ... Interphase insulation , 21 ... Lead wire connecting part, 22 ... Insulating material for lead wire connecting part.

Claims (5)

  In a hermetic electric compressor using a concentrated winding type stator in which a winding is wound directly around a stator core via an insulating material, the stator is a flat interphase insulating material inserted between the windings in the slot. The interphase insulating material is an I-shaped insulating film provided with protrusions extending in the stator outer diameter direction and the center direction at both ends in the stacking direction, and the protrusions are hooked to the stator end portions. A hermetic electric compressor characterized by mounting a stator.   In a hermetic electric compressor using a concentrated winding type stator in which a winding is wound directly around a stator core via an insulating material, the stator is a flat interphase insulating material inserted between the windings in the slot. The interphase insulating material is a T-shaped insulating film provided with a protruding portion extending in the outer diameter direction and the center direction of the stator at one end portion in the stacking direction, and the protruding portion is latched to the stator end portion. A hermetic electric compressor characterized by mounting a stator.   In a hermetic electric compressor using a concentrated winding type stator in which a winding is wound directly around a stator core via an insulating material, the stator has a flat interphase insulating material between windings in a slot, Both ends of the interphase insulating material in the cross section of the stator are inserted between the stator winding and the outer diameter of the slot, and between the stator winding and the opening of the slot, respectively. It is longer than the slot depth dimension connecting the slot opening and the outermost diameter portion of the slot, and is mounted with a stator that is inserted between the stator windings in the slot while being curved in an S shape. Hermetic electric compressor.   4. The S-shaped interphase insulating material for a hermetic electric compressor according to claim 3, wherein the S-shaped interphase insulating material has a notch in the stator stacking direction in the stator cross-section direction, and is folded from the notch to be interphased. A hermetic electric compressor characterized in that a stator having a structure for hooking an insulating material to the stator is mounted. 5. The stator of a sealed electronic brain compressor according to claim 3, wherein the slot has a slot insulating paper in the stator slot, and the slot insulating paper has a folding back in a direction opposite to the opening at the slot opening. A hermetic electric compressor characterized by mounting a child.

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