JP2006197662A - Stator with skew - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a slot insulation sheet from rubbing on burrs at the slot opening of a stator core and being damaged due to skew after insertion of winding. <P>SOLUTION: In the stator with skew having a plurality of slots in the inner circumference of a stator core and applied with a winding and a sheet for insulating the winding in the slot, a double insulation sheet is employed and the core side insulation sheet is composed of a material having a hardness higher than that of the winding side insulation sheet and better splipperiness. Consequently, the slot insulation sheet can be prevented from being damaged due to rubbing on burrs at the slot opening of a stator core resulting in a highly reliable stator exhibiting high insulation performance. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The skewed stator according to the present invention has an effect of improving insulation performance with low noise and high efficiency, and is effective for a stator of a brushless motor for a compressor mounted on a home air conditioner or a car air conditioner for automobiles. is there.

  In recent years, energy conservation efforts have been actively carried out to improve the global environment, and automobiles have been considered to be electrified to improve fuel efficiency and exhaust gas, and motors have become more efficient, smaller and lighter, In addition, low noise is required.

  In order to reduce noise, it is known that the stator or rotor is skewed. In the case of a skew specification in a brushless motor mounted on a compressor for a home air conditioner, a pseudo skew on the rotor side is used. There are many cases. In contrast to the pseudo skew, the continuous skew has a great effect of low noise and low vibration because the change of magnetic flux is smooth, but it is a pseudo skew on the rotor side mainly from the viewpoint of manufacturing.

  In addition, the method of skewing on the stator side is a method of winding on a stator core that has been skewed in advance in the state of the stator core, and a method of performing skewing after performing winding without skewing in the state of the stator core. It has been known. In the former case, a direct winding method in which the winding is wound directly around the stator core, a manual manufacturing method, a stator having a relatively small number of slots, or a stator having a relatively short structure There are many cases adopted in In the latter case, there are many cases of the inserter system in which the winding is inserted from the inner diameter side opening of the slot.

  In the case of a vehicle-mounted compressor, a structure having a small outer diameter is generally preferred for mounting. For high output with the same outer diameter, a long stack thickness is required. Further, in the case of low vibration and low noise, it is necessary to increase the number of slots. In other words, considering high output, low vibration, and low noise at the same outer diameter, a structure with a long slot thickness and a large number of slots is required, and the inserter method is effective.

  In the case of the inserter method, it is generally known that the winding is inserted from the anti-burr side in the slot portion formed in the stator core in consideration of slot insulation at the time of insertion and damage to the winding. .

  When skewing is performed after the winding is inserted, the winding in the slot is pressed and the slot insulating sheet is strongly pressed against the stator core. Since the axial opening of the slot serves as an outlet of the winding, the winding is opened from the inside of the slot, so that the slot insulating sheet is more strongly pressed against the edge of the slot opening of the stator core. . Needless to say, if there is a burr at the edge portion, the stress on the slot insulating sheet becomes more severe.

  As an example of improving the motor efficiency, means for increasing the winding amount in the slot and reducing the copper loss are widely known. In other words, the stress on the insulating sheet further increases due to the increase in the winding amount, and the slot insulating sheet is pressed more strongly against the edge of the slot opening of the stator core.

On the other hand, if the fixed iron core is twisted and skewed during skewing, the longitudinal length of the slot becomes longer depending on the skew angle, so the relative position of the iron plate sheet in contact with the slot insulation sheet before skewing changes. Then, the iron plate sheet and the slot insulating sheet rub against each other. As described above, the anti-insertion-side stator core end face of the winding, that is, the slot-opening side slot opening of the winding, is generally the burr side. As a result, the slot insulation sheet is rubbed while being pressed against the slot opening burr of the stator core with a strong force, so that the slot insulation sheet is scraped and thinned, and the slot insulation sheet is cracked. was there. (For example, see Patent Document 1)
JP 2004-40897 A

  The problem to be solved is that the slot insulation sheet rubs against the burr at the slot opening of the stator core due to the skew after the winding is inserted, and the slot insulation sheet is damaged.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a high-reliability, low-noise motor stator having a simple structure and higher insulation performance.

  In order to achieve the above object, a skewed stator of the present invention has a skewed structure in which a plurality of slots are provided on the inner periphery of a stator core and an insulating sheet and a winding are installed in the slots to insulate the windings. The stator is characterized in that the insulating sheet is composed of a double layer, and the insulating sheet on the iron core side is made of a material that is higher in level than the insulating sheet on the winding side and has a good sliding property.

  As a result, it is possible to prevent the slot insulation sheet from being damaged due to the burrs at the slot openings of the stator core and the friction between the slot insulation sheet. Therefore, a highly reliable stator with high insulation performance can be provided.

  The insulating sheet on the winding side is configured to wrap the insulating sheet on the iron core side by folding back at both ends, and the length of the wrapping portion of the insulating sheet on the winding side is 0.3 to the length of the core insulating sheet. It is characterized by being 1.5 mm longer.

  As a result, the slot insulating sheet on the core side is not pressed by the folded portion of the slot insulating sheet on the winding side and is not easily deformed. Therefore, damage to the slot insulating sheet on the core side can be prevented, and higher reliability and higher reliability can be achieved. Can provide a stator.

  According to the present invention, even if the slot insulation sheet rubs against the burr at the slot opening of the stator core due to the skew after the winding is inserted, the slot insulation sheet moves smoothly, so that the slot insulation sheet is not damaged, and the insulation performance High-noise and low-noise stators can be manufactured.

The insulation sheet on the iron core side is made of a relatively hard material with good sliding properties so that the slot insulation sheet does not rub against the burr at the slot opening of the stator core due to skew after winding insertion. A low noise motor stator with high insulation performance that prevents damage was realized.
Examples of the present invention will be described below.

  FIG. 1 is a perspective view of a stator in one embodiment of the present invention, and FIG. 2 is a partial cross-sectional view of the stator in one embodiment of the present invention.

  A slot insulating sheet of straight-shaped material PPS film 3a is folded over the slot 2 of the stator core 1 in which a predetermined amount of 0.35 mm iron sheet (JIS symbol 35A300) having a plurality of slots 2 on the inner diameter side is laminated. A double slot insulating sheet wrapped in a certain shape material PEN film 3b is mounted. The folded portion 3c of the PEN film 3b has a function of wrapping the straight PPS film 3a and simultaneously mounting and holding it on the stator core 1. The PEN film has a lower hardness than the PPS film and can be folded. On the other hand, the PPS film is hard, so that it is difficult to be folded but has a good slip property. The present application effectively utilizes the characteristics of the insulating sheet.

  After inserting the winding 4 in a straight state with no skew from the side opposite to the burr side of the stator core 1, when the stator core 1 is twisted and skewed, the winding 4 in the slot is pressed and the slot insulation on the core side is pressed. The PPS film 3a which is the sheet 3a is strongly pressed against the iron plate sheet. This becomes more conspicuous at the exit of the winding 4, and the relative position of the iron plate sheet in contact with the PPS film 3a changes and the iron plate sheet and the PPS film 3a rub against each other, but the PPS film 3a has a hardness. Since it is high and slippery, the PPS film 3a itself is not damaged and can be prevented from being damaged, and a skewed stator having high insulation performance can be provided.

  In addition, PPS film and PEN film have a merit that the leakage current of the alternating current component is small because the dielectric constant is small compared to a general PET film, and also has high insulation performance due to good hydrolysis resistance. Therefore, a highly reliable skewed stator can be provided. If further added, since the PPS film is not an ester bond, it is not hydrolyzed, so that the insulation performance is further improved.

  FIG. 3 is a cross-sectional view of a slot insulating sheet in one embodiment of the present invention.

  Similarly, the slot 2 of the stator core 1 is fitted with a PPS film 3a on the iron core side and a slot insulating sheet of a folded PEN film 3b on the anti-iron core side (winding side). The length of the wrapping part of the PPS film was 0.3 to 1.5 mm longer than the length of the PPS film. As a result, the PPS film is not compressed by the folded portion of the PEN film and is not easily deformed. A high-performance skewed stator can be provided.

  The skewed stator according to the present invention has an effect of improving insulation performance with low noise and high efficiency, and is useful for a stator of a brushless motor for a compressor mounted on a home air conditioner or a car air conditioner for a car. is there.

The perspective view of the stator in one Example of this invention The fragmentary sectional view of the stator in one example of the present invention Sectional drawing of the slot insulation sheet in one Example of this invention Partial sectional view of a conventional stator

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stator core 2 Slot 3 Slot insulation 3a Slot insulation sheet PPS film on the core side 3b Slot insulation sheet PEN film on the winding side 3c Turn-up part 3d Slot insulation sheet PET film on the core side 3e Slot insulation sheet PET film on the winding side 4 windings

Claims (4)

In a stator with skew having a plurality of slots in the inner periphery of the stator core and insulating the windings in the slots, and a stator with a winding, the insulating sheet is composed of two layers, Insulation sheet is a skewed stator made of a material with a higher level than the insulation sheet on the winding side. In a stator with skew having a plurality of slots in the inner periphery of the stator core and insulating the windings in the slots, and a stator with a winding, the insulating sheet is composed of two layers, Insulation sheet is a skewed stator made of a material that is more slippery than the insulation sheet on the winding side. In a stator with skew having a plurality of slots on the inner circumference of the stator core and insulating the windings in the slots and mounting the windings on the slots, the insulating sheet is made up of two layers and the winding side The insulation sheet of the core is configured to wrap the insulation sheet on the iron core side by folding back both ends, and the length of the wrapping portion of the insulation sheet on the winding side of the previous period is 0.3 to 1.5 mm longer than the length of the core side insulation sheet This is a skewed stator. In the stator with skew according to claim 1 and claim 2, the insulating sheet on the winding side wraps the insulating sheet on the iron core side by folding both ends, and the length of the wrapping portion of the insulating sheet on the winding side is A skewed stator characterized by being 0.3 to 1.5 mm longer than the length of the core-side insulating sheet.

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