Harmonic Loss Reduction in High Speed Motor Drive Systems by Flying Capacitor Multilevel Inverter


When inverters drive an AC motor, the harmonic components of the output voltage result in extra iron and copper losses in the motor's magnetic cores. Inductance is meant to be tiny in high-speed motors, so the ripple in the current flowing through the motor increases. As a result, with high speed motors, ripple current losses often create significant extra losses. Multilevel inverters are being used in high speed motor drive systems in this study as a solution to these issues. The internal voltage sources of multilevel converters can produce many levels of output voltage. As a result, harmonics and EMI are reduced. Simulated and experimental results show that multilevel inverters can reduce motor losses in high-speed motors.

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