Detection of Interturn Short-Circuits of E-Bike BLDC motor

Abstract

The interturn short-circuit is one of the most often failures of electric motors which can lead to serious consequences with the irreversible damage of the whole drive. The detection of these short-circuits is a challenging task depending also on the parameters of the winding of the analyzed machine. The equivalent circuit parameters are minimally affected if the winding consists of a high number of parallel wires, and only a single turn of one parallel wire is short-circuited. The measurement of additional Joule losses are then expected to be the most proper approach; the special rotor and testing stand for this purpose is designed in this paper to ensure easy manipulation with the measured stators.