Safe Turn-Off Strategy for Electric Drives in Automotive Applications

This article proposes a strategy to safely turn-off an electric drive system in case of fault without destroying the power module and machine. Classic strategies, such as active short circuit (ASC) freewheeling (FW), are adopted state art for vehicle applications. However, these methods cause either high currents machine or overvoltage dc-link capacitor, should be designed withstand unwanted effects making them more expensive. The novel method proposed this study mitigates both overcurrents, thereby achieving smooth transition from torque control safe state. can implemented almost cost neutral with respect state-of-the-art methods. In method, voltage vectors identified position current vector, which charge discharge hence keeping stator value. is analyzed through simulations combined inverter model. simulation model includes skin effect loss models that essential accurate calculation voltage. Measurements were done on validate strategy.