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Integrated Motor Drives

T34.1 - Analysis and Experimental Validation of Inverter Switching Frequency Impact in High-Speed Air-Cooled Motor-Inverter Systems

Thursday, March 26, 2026
10:20 AM - 10:40 AM CT
Location: 214B
This study prototyped and experimentally evaluated a high-speed air-cooled integrated motor-inverter system (6kW power), focusing on the impact of inverter switching frequency on losses and thermal performance. Increasing the switching frequency from 30 kHz to 60 kHz increases the inverter loss, but more than that, it decreases the electromagnetic loss of the motor, resulting in an approximately 20% reduction in the combined inverter and electromagnetic losses, and a notable reduction in rotor temperature was observed, improving the motor’s thermal margin. These findings demonstrate that optimizing the inverter switching frequency effectively enhances both efficiency and thermal stability in high-speed air-cooled motor-inverter systems.