JP2000333398A - Stator of electric rotating machine and fully enclosed motor compressor mounting it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the stator of a rotating machine in which leakage current of an electric rotating machine is reduced while enhancing productivity. SOLUTION: Leakage current is reduced by employing a polyester film 5 including an air gap part as the slot insulating paper at the slot insulating part 4 of the stator of an electric rotating machine and productivity thereof can be enhanced by employing it in combination with a polyester film 6 having high strength and excellent lubricity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating electric machine stator used as a generator or a motor, and a hermetically sealed electric compressor equipped with the same.

[0002]

2. Description of the Related Art Conventionally, a polyester film such as polyethylene terephthalate (PET) has been used as a heat-resistant general-purpose film as an insulating material for a rotating electric machine stator.
From the viewpoint of excellent insulation performance, heat resistance, workability, cost, etc., it has been used for slot insulation, slot spacer, wedge, and the like of a slot insulation portion between an iron core and a field coil.

[0003] In a rotating electric machine stator such as an electric motor,
Inverter control that can be precisely controlled is often performed for higher efficiency and higher function, and as a result,
An increase in leakage current of high-frequency components in the insulating member has become a problem. In particular, when used in a hermetic electric compressor, it is used in a refrigerant or refrigerating machine oil, so an increase in leakage current is a major problem. As a countermeasure, a film having a low dielectric constant using a polyester film including voids in slot insulating paper has been used.

[0004]

In the above-mentioned conventional insulating material for a rotating electric machine stator, in the case of a general-purpose polyester film, an insulating paper excellent in terms of insulation performance, heat resistance, workability, and cost. However, there is a limit to the dielectric constant, which is an intrinsic value of plastic, and it may not be possible to satisfactorily cope with an increase in leakage current of high-frequency components due to the inverter control described above. In the case of a polyester film containing voids, the dielectric constant can be lowered by increasing the content ratio of the voids, but the strength of the film is reduced depending on the content ratio of the voids, and the processability is reduced. It gets worse.

An object of the present invention is to solve the above problems and to provide a rotating electric machine stator having high productivity and low leakage current.

[0006]

SUMMARY OF THE INVENTION In order to solve this problem, the present invention provides a first polyester film including a void in a slot insulating portion between an iron core and a field of a rotating electric machine stator; A second polyester film having higher strength and good lubricity is used by being overlapped.

As a result, it is possible to obtain a rotating electric machine stator having good productivity and low leakage current.

[0008]

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a first polyester film having a low dielectric constant and including voids in a slot insulating portion between an iron core and a field coil; A rotating electric machine stator in which a good second polyester film is used by laminating the first polyester film having a low dielectric constant and a second polyester film having good strength and lubricity.
By overlapping the polyester films of
A rotating electric machine stator with low leakage current and high productivity can be realized.

Further, by disposing the second polyester film having good strength and lubricity on the field coil side of the slot insulating portion, it is possible to withstand the coil insertion stress when assembling the stator of the rotating electric machine. The productivity of the electric stator is improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rotating electric machine stator 1 of the present embodiment has a slot insulating portion 4 between an iron core 2 and a field coil 3 as shown in FIG.
In this configuration, the first polyester film 5 including voids and the second polyester film 6 having high strength and good lubricity are overlapped and arranged.

FIG. 2 is a partial cross-sectional view showing the assembly of the rotating electric machine stator 1. A magnetic field is applied to a slot insulating portion 4 on an iron core 2 on which the polyester films 5 and 6 are arranged, in the direction shown in FIG. It is shown that the coil 3 is inserted. Here, when the field coil 3 is inserted into the iron core 2, the first polyester film 5 and the second polyester film 6 are pressed against the slot corners 7 of the iron core 2. At this time, as the ratio (occupancy ratio) of the inserted field coil 3 to the slot 8 is higher, the force of pressing the polyester films 5 and 6 against the slot corners 7 is higher, so that the second polyester having higher strength is used. By arranging the film 6 on the field coil 3 side, a structure that can withstand the insertion stress of the field coil 3 can be obtained. Further, since the second polyester film 6 has lubricity, the coil insertion of the field coil 3 becomes smooth, and as a result, the coil insertion stress can be reduced.

It is to be noted that the second, high-strength and good lubricating property
The polyester film 6 corresponds to polyethylene naphthalate (PEN) or the like.

FIG. 3 shows the form of the first polyester film 5 including voids. Since the voids 9 are provided inside the first polyester film 5, the dielectric property is high. The rate can be lowered.

[0014]

As described above, according to the first or second aspect of the present invention, as the slot insulating film between the iron core of the rotating electric machine stator and the field coil, a polyester film including a void portion, By combining polyester films that have higher strength and lubricity than the polyester film that includes the part, the leakage current is small, quality problems when inserting the coil are less likely to occur, and high performance production It is possible to provide a rotating electric machine stator excellent in performance.

According to the third aspect of the invention, by arranging the polyester film having good lubricity on the field coil side, the coil slipping property at the time of inserting the coil is improved, and the productivity of the rotating electric machine stator is improved. Can be improved.

According to the fourth aspect of the present invention, it is possible to reduce the leakage current even in an inverter driven fully hermetic electric compressor under particularly poor conditions.

[Brief description of the drawings]

FIG. 1 is a sectional view of a rotating electric machine stator according to the present embodiment.

FIG. 2 is a schematic view of the rotating electric machine stator assembly of the present embodiment.

FIG. 3 is a partial cross-sectional view of a first polyester film including a void according to the present embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 rotating electric machine stator 2 iron core 3 field coil 4 slot insulating part 5 first polyester film 6 second polyester film 7 iron core slot corner 8 slot 9 first polyester film void

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Shinichi Okuyama 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F-term (reference) 5H604 AA08 BB01 BB08 BB14 CC05 CC15 DA16 DA17 DB26 PB03

Claims (4)

[Claims] A stator core having a plurality of slots;
A rotating electric machine stator including a field coil wound around the iron core via a slot insulating film, wherein the slot insulating film includes a first polyester film including a void portion; A rotating electric machine stator comprising a second polyester film, which has higher strength than a polyester film and has good lubricity, is superposed on the second polyester film. 2. The rotating electric machine stator according to claim 1, wherein polyethylene naphthalate (PEN) is used as the second polyester film. 3. The rotating electric machine stator according to claim 1, wherein a second polyester film having high strength and good lubricity is arranged at least on the field coil side. Rotating machine stator. 4. An all-inverter driven hermetically sealed electric compressor equipped with the rotating electric machine stator according to claim 1.