The influence of sensor faults on PM BLDC motor drive

The correct commutation of a PM BLDC motor requires information about the rotor position, which can be obtained from rotor position sensors built in motor. Every fault of these components reduces the reliability and performance of the drive system. In this work PM BLDC motor control system has been presented and the influence of some sensor faults on phase currents waveforms has been discussed. For the diagnostic evaluation a-p plane hodographs of phase currents vector and rotor position sensors vector have been proposed. Faulty sensor detection and identification algorithm has been presented. A post-fault operation has been proposed and sample results are presented too.