An Instantaneous Torque Estimation of Double Salient Electromagnetic Motor Based on Energy Conversion Process Analysis

Torque closed-loop control is a common and effective control method for torque ripple suppression, but it relies on an effective torque estimation. In order to solve the problem of torque estimation of doubly salient electro-magnetic motor (DSEM), a method of on-line instantaneous torque estimation is proposed in this paper. Firstly, the estimated expression of torque is derived by analyzing the energy conversion process of torque output. Then, the back EMF integral is used to calculate the flux linkage, and the self-inductance and mutual inductance are further obtained. Finally, the simulation results show that the proposed method can effectively estimate the torque and provide real-time torque feedback signal for DSEM torque closed-loop control.