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Low Relative Permittivity of Magnet Wire Insulation Coating for HEV Motor

Article of Honda R&D Technical Review Vol.32 No.2

Summary

An insulation coating that achieves a balance of heat resistance and insulating properties was developed for use in HEV motors. Technology was established that lowers the relative permittivity as low as 2.4, which is at the level of polyethylene and other such low-permittivity materials, while also having heat resistance with the high temperature index of 250°C by causing independent gas bubbles to be dispersed evenly in polyimide resin. This technology made it possible to maintain the insulating properties of conventional magnet wire while reducing the coating thickness by approximately 20% and increasing the cross-sectional area of the conductor by approximately 6%. As a result, losses in newly developed motors were successfully reduced by 5% relative to conventional motors.

Reference

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Author (organization or company)

Ryotaro KANEKO(Innovative Research Excellence)、Tadao NISHIYAMA(Honda Motor Co., Ltd.)、Keisuke AZUSAWA(Innovative Research Excellence Power Unit & Energy)

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