A fault resilient IPM motor drive for wide speed range operation
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abstract
Interior permanent magnet motors are superior to surface mount permanent magnet motors due to some of their inherent characteristics such as higher torque density. These motors enjoy an extended flux weakening region because of their reluctance torque and ruggedness of the rotor which is an important factor in high speed applications. The above mentioned advantages of the IPM motor depend on the saliency ratio of the motor. In order to obtain high performance motor drives, modern control strategies like field oriented control should be employed. These techniques are inherently dependent on the proper operation of measurement devices, or feedback sensors (current sensors, position sensor or even voltage sensors). In this paper, in order to guarantee a reliable drive, a fault resilient system with soft sensors and automatic controller reconfiguration is designed. These soft sensors substitute the actual sensors in case of sensor failure such that the motor continues operating safely over the whole speed range. Theoretical and experimental results will be presented to validate the proper operation of the proposed back up system.
