Sensorless Control of Bilateral LSRM With Eccentricities Based on Coupled Voltage

Abstract

Based on the structural characteristics and magnetic flux distribution of the segmented bilateral LSRM (Linear Switched Reluctance Motor), a magnetic network model of the motor under single-side excitation is constructed using the magnetic circuit segmentation method in this paper. The influence of the lateral displacement of the motor mover on the winding inductance is analyzed. On the basis of the coupled voltage method for estimating mover position, the relationships between the coupled voltages and the positions of the motor in both directions under asymmetric air gaps are further studied, and a position detection index that can avoid the influence of uneven air gaps is proposed. Finally, on the laboratory prototype test platform, sensorless control experiments are completed for the motor without lateral displacement of the mover and under different lateral displacement conditions. The experimental results show that the LSRM position sensorless control method based on the coupled voltages of both coils proposed in this paper can achieve accurate estimation of the starting position, smooth starting operation, and chopping control velocity regulation operation under different lateral offsets of the motor.