FAULT TOLERANT CONTROL OF 3PH PMSM WITH INTER-TURN FAULTS

Abstract

Inter-turn faults are most commonly the initial stator winding fault in drive systems with Voltage Source Inverters (VSI). To prevent the propagation of an inter-turn fault, the machine must stay within its thermal requirements at the location of the fault. We present a fault tolerant control scheme which minimizes the propagation of the fault by adapting the operating point of the machine. The heat loss of the inter-turn fault is estimated with a machine learning regression. If the estimated heat is greater than the maximum allowable value, the operating point is adapted until the estimated heat is below this limit. We validated the concept of the control scheme with a Finite Element Analysis (FEA) simulation. For the presented fault scenario, we are able to reduce the heat of the inter-turn fault by 17:5W, which equals a temperature reduction of 140 K. Therefore, we are able to keep the local temperature at the fault under the heat shock temperature of the isolation material.