This paper adopted the variable switching frequency PWM (VSFPWM) control to the SPMSM and combined the VSFPWM with SVPWM and DPWM. A power loss model was built to quantitatively compare the system efficiency at CSF/VSF SVPWM and CSF/VSF DPWM. Simulation and experimental validations were pursued on a 5kW surfaced-mounted permanent synchronous motor (SPMSM) drive system. I.
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