Analysis and Control of a Dual-Stator PM Motor Based on Parallel Path Magnetic Technology

This article makes a systematical and comprehensive study of a new stator-PM motor based on parallel path magnetic technology (PPMT), naming PPMT motor, which has not been studied deeply. This motor’s unique structural feature lies in that the PMs are identically embedded in the stator with the polarities opposite and the excitation windings are wounded on the stator yoke, which distinguishes it from PMSM and other stator-PM motors. To analyze this motor, first, we summarize the fundamental structure and operation principle of single-phase and poly-phase PPMT motors, and then, FE analysis is conducted to verify the motor’s electromagnetic property and establish the motor’s mathematical model. Compared with the flux-switching permanent-magnet (FSPM) motor, the PPMT motor has lower slot torque, torque ripple, and better sinusoidal back EMF, which makes it more suitable for servo application. Next, we propose a control strategy for the PPMT motor with simulation verification. Finally, a prototype of a dual-stator PPMT motor and driver circuit are constructed for experimental verification; the result shows that with sliding mode control, the speed loop has a better performance, though the control method and performance of the position loop need to be further studied and improved. This article conducts fundamental research for PPMT motors and further research needs to be done to improve the performance for specific applications.