Analysis of Parameters and Eddy Current Loss on Outer Stator Magnetic Gear Integrated Permanent Magnet Motor

The working principle of the outer stator magnetic gear (MG) integrated permanent magnet (PM) motor is analyzed theoretically. The influence of the ferromagnetic pieces parameters of the outer stator MG integrated PM motor on electromagnetic torque of the ferromagnetic modulation ring rotor is analyzed by FEM simulation, and the optimal width of the ferromagnetic pieces is determined. By setting up imaginary coils at the boundary between each stator PM with different magnetizing directions and on the two air gaps sides of each non magnetic portion in the ferromagnetic modulation ring, the change law of flux linkage on the imaginary coils when the motor is unloaded and loaded is analyzed by simulation. The change law of induced electromotive force (EMF) and the trend of eddy current loss in each PM and non magnetic portion can be further obtained. The loss of each component in the motor obtained by simulation shows that the eddy current loss of the outer stator MG integrated PM motor is mainly concentrated in PMs and non magnetic portions of the ferromagnetic modulation ring. In the design and manufacture of such motors, effective countermeasures and technical measures must be taken to reduce the eddy current loss under the premise of ensuring the mechanical strength of the motor, so that the motor can be applied in engineering.