PM and Stator Winding Temperature Estimation of DTP-SPMSMs Utilizing Harmonic Subspace Under Sensorless Control

Permanent magnet (PM) flux linkage and stator resistance are critical thermal indicators for online monitoring PM and winding temperatures of the dual three phase surface-mounted permanent magnet synchronous machines (DTP-SPMSMs). However, both estimations are compromised by position error under sensorless control. This paper proposes a simple online estimation method of PM flux and resistance for the DTP-SPMSMs utilizing harmonic subspace to eliminate the influence of position error under vecto