Hysteresis controller based open phase fault tolerant control of BLDC motor drives

This paper proposes a simple technique for open phase fault detection, and identification of BLDC motor. Also it explains a fault tolerant strategy which can be used to continue the normal operation of a BLDC motor in spite of the open phase fault. As BLDC motors are used in critical and dangerous control areas like military services, space vehicles a fault tolerant drive is essential to maintain the operation. In this paper the detection and identification of open phase fault is done using simple logical technique. This technique can be easily incorporated in an already existing normal closed loop speed control drive without much additional cost.