A sensor-less method for online thermal monitoring of switched reluctance machine

Stator winding is one of the most vulnerable parts in Switched Reluctance Machine (SRM), especially under thermal stresses during frequently changing operation circumstances and susceptible heat dissipation conditions. Thus real-time online thermal monitoring of the stator winding is of great significance to the system protection and lifetime extension of SRM. A sensor-less approach for online thermal monitoring of stator winding of SRM is proposed in this paper, only voltage and current measurements which already exist in the control system are needed to estimate the temperature of stator winding, neither machine parameters nor thermal impedance parameters are required in the scheme. Simulation results under various operating conditions confirm the proposed sensor-less online thermal monitoring approach.