Method for detecting the loss of one or more phases in a permanent-magnet synchronous electric motor

摘要

The method involves determining a reference flow current (Idref) according to reference torque current (Iqref), where the torque current is calculated from a reference speed (Wref) to be applied to a permanent magnet synchronous motor and from speed measurement (Wmes) or position realized on the motor. The flow current is applied to inject currents (I1- I3) on different phases of the motor. Currents are measured on single, double or triple phases, and loss of the phases are determined from the measured current.