Analysis and control of novel split-winding doubly salient permanent magnet motor for adjustable speed drive

In this paper, a novel split-winding doubly salient permanent magnet (DSPM) motor is proposed and the theoretical and experimental studies on the magn etic field, static characteristics and control strategy of this motor are c arried out. The steady-state and dynamic models are presented and the outpu t power equation is derived. The feasibility of extending the operation ran ge of the DSPM motor by using split-windings is proved. The finite element method is used to analyze the magnetic field, in which the leakage flux out side the stator circumference is taken into account. Based on the operation principle and the static characteristics of the motor, the control strateg y and scheme are developed and implemented in a microcomputer-based control ler. According to the features of the 4-phase 8/6-pole DSPM motor, a half-b ridge power converter without neutral is adopted to reduce the number of po wer devices and to eliminate the problem of voltage unbalance in the split capacitors. The experimental results on the prototype machine not only veri fy the theoretical analysis, but also show that the proposed DSPM motor dri ve possesses good steady-state and dynamic performances, offering high effi ciency over wide power range, and that the split-winding topology can effec tively extend the operation range of the DSPM motor.