Electric motor insulating sheet and manufacturing method therefor

Abstract

Provided is an electric motor insulating sheet forming a slot insulating sheet (12), in which aramid paper and a PPS film are directly pressure laminated without the use of an adhesive. Thus, an adhesive layer is not present between the aramid paper and the PPS film. The PPS film is low-cost in comparison to a polyimide film, has high thermal properties such as heat dissipation, and has a high resistance against heat. As a result, a high strength is maintained even when exposed to a high temperature for a long period of time. Additionally, since the aramid paper and PPS film are directly laminated without the presence of an adhesive layer, the overall thickness is reduced by a thickness equivalent to that of the adhesive layer, thereby enabling a thinner film.

Description

technical field [0001] The present invention relates to an insulating sheet for a motor such as a motor or a generator, and particularly relates to an insulating sheet for a motor excellent in mechanical properties, heat resistance, electrical insulation, and chemical resistance, and a method for producing the same. Background technique [0002] In recent years, with the spread of hybrid vehicles, electric vehicles, etc., small and high-output electric motors have been developed. In such a motor used in a hybrid vehicle or an electric vehicle, an insulating sheet is used to insulate between a coil and a core around which the coil is wound. As an insulating sheet for a motor, for example, heat-resistant synthetic insulating paper called aramid paper is used. Specifically, for example, an aramid paper with a thickness of 2 to 20 mils (mil: one-thousandth of an inch) excellent in heat resistance, mechanical properties, and electrical insulation properties of Du Pont Company of...

AI Technical Summary

Problems solved by technology

[0008] However, the adhesive of the insulating material formed by laminating the above-mentioned aramid paper and the PET film of (A) with an adhesive is relatively hard.

Therefore, there is a disadvantage that the excellent flexibility of aramid paper and PET-based films is impaired, and the processability such as bending processing is poor.

However, the polyimide film is very expensive, and the laminate of aramid paper and polyimide film obtained as a result is also an expensive material

Therefore, the laminated body of this aramid paper and polyimide film cannot be widely used in popular hybrid and electric vehicles.

[0011] As a result, it is difficult to balance thermal characteristics such as heat resistance and heat dissipation with durability without causing an increase in price

In addition, an increase in thickness or a decrease in flexibility, as well as a decrease in thermal characteristics prevent an increase in the number of coil turns in the motor, and there is a problem that further improvement in motor performance is hindered.

Images