The electromagnetic characteristics analysis and the control of a new axial flux permanent magnet machine with a double-PCB stator

To enhance the load capacity of the axial flux permanent magnet motor (AFPMM), a new AFPMM with a double-printed circuit board (PCB) stator is proposed and analyzed. Based on its theoretical model and three-dimensional finite element analysis model, the magnetic field and torque characteristics are discussed. The structural parameters of the motor are analyzed and optimized by Taguchi’s method to obtain higher torque and lower torque ripple. Compared to the intermediate stator AFPMM, the proposed motor has a higher output torque. Then, the temperature rise characteristics of the motor were studied to examine the demagnetization and PCB insulation performance. The compensated inductance scheme was adopted to solve the problem of poor continuity of the motor current in PCB winding. The dynamic response speed and torque ripple suppression of the motor were improved by a new type of sliding mode control strategy with a proximity-based rate. Finally, the simulation results and basic electromagnetic performance of the motor were verified by the experimental testing. The proposed AFPMM and its control system achieve an excellent electromagnetic characteristic and a stable dynamic response performance.