Fault Diagnosis and Fault-tolerant Control of Position Sensors for Switched Reluctance Motors

Position sensor is the key of exact commutation for switched reluctance motor (SRM). When position sensor is faulted, some phase information of commutation will be lost, causes torque decrease, affects the system reliability. Through the analysis of the fault position signals, a real-time diagnostic method that detected the edge sequences of position signals and calculated the angle between the adjacent edges of position signals is proposed. After fault of position signal is diagnosed, fault-tolerant control is carried out immediately by taking advantage of the redundant information of position signal detection scheme and the time between the adjacent edges of position signals. The validity and practicability of fault analysis, fault diagnosis and fault-tolerant control is verified by simulated fault experiments on SRM. Copyright © 2013 IFSA.