Abstract
The characteristics in power factor and reliability of the linear permanent-magnet vernier (LPMV) motor determine the applications. In order to ensure its continued operation, a novel fault-tolerant scheme is proposed for the breakdown of one certain bridge arm based on a floating capacitor bridge dual-inverter structure driving an open-winding LPMV motor. The dual-inverter structure consists of two voltage source inverters. Namely, one is connected to a dc power named as main inverter, and the other is linked to a floating capacitor called capacitor inverter. In order to solve the voltage limit problem, a unity power factor strategy is developed in this fault-tolerant control, in which the main inverter is just in charge of active component, and all of the reactive power is compensated by capacitor inverter. Simulated and experimental results validate the proposed control strategy.
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