Study on Variable PWM Control of Electric Vehicle Motor

In this study, we focused on permanent magnet synchronous motors used in motors for electric vehicles, and tried to suppress vibration by changing the carrier frequency. First, the resonance point (7000 Hz) between the permanent magnet synchronous motor and the carrier frequency was clarified by performing an exhaustive analysis by changing the carrier frequency at a constant level. Next, carrier frequency sweep analysis was performed to clarify the effects of interference with the initial carrier frequency and rotation components. Finally, we proposed a modification scheme in which the carrier frequency is changed discontinuously, and succeeded in suppressing the vibration compared to the conventional method in which the carrier frequency is kept constant at 10000 Hz.