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Development of a novel hysteresis current controller for three phase induction machines

In electrical drive systems, speed controlled induction machines are often used. Speed variation can be achieved by field orientation. In order to drive the machine, this may require an output current controlled voltage inverter. For this purpose hysteresis based current controllers are often chosen, because of their simplicity. For proper operation of sensorless control at zero speed, the current has to show low distortion, especially at low speed. Nevertheless, a classic hysteresis current controller gives too much distortion. This paper describes the development of a novel hysteresis current controller, which avoids the use of zero-voltage vectors, to decrease harmonic distortion. Due to the stable, predictable and regular behaviour, the designed controller meets the machine requirements.