The electrification of power sources for various types of mobility is progressing. In particular, high power density is required for air mobility applications require high power density. To increase the output density of high-speed fan-drive motors, reducing the temperature rise of the motor is crucial. We investigated various techniques to improve the output density of the high-speed fan-drive motor using amorphous metal, which reduces iron loss during the high-frequency drive, and using an air-cooling structure with a high-speed fan. Thus, a maximum torque of 200mN·m was achieved at a current density of 40Arms/mm2; moreover, a power density of 13kW/kg was obtained. This report presents the findings of our investigation and the evaluation results of a prototype motor.
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