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R. Wieser:
"A Dynamic Performance Booster for Current Regulated Induction Machines at High Speed Utilizing Trapped Rotor Flux"";
Poster: ICEM, Istanbul, Turkey; 1998-09-01; in: "International Conference on Electrical Machines ICEM'98", (1998), 1.

Field oriented controlled variable speed induction machine drives utilize current regulated PWM voltage source inverters as a reliable and fast operating power source. The current controller builds thereby the innermost loop of the control scheme and its performance determines the overall dynamic drive characteristics. The fast responding and accurate synchronous frame PI-controller has become the standard solution for this task. However, high machine back-EMF voltage deteriorates the controller performance due to a lack in manipulation voltage at high speed. The proposed method improves the current controller dynamic properties at high speed utilizing the rotational characteristic of the desired stator current. Classical d-q-regulation is dropped and the commanded current is modified during the short transient in order to boost the torque change. A limitation in the target shift of the boost sequence ensures an improved and sign consistent torque response for the outer control loops. The modifications of the control structure are moderate and do not require much computation power.