A Novel Discrete EMN for Electromagnetic Force and Vibration Computation of SPM Machine Considering Carrier Harmonics

This article proposes a discrete equivalent magnetic network (EMN) for electromagnetic force and vibration computation of surface-mounted permanent magnet (SPM) machines considering carrier harmonics. First, a new triangle permeance element is proposed and adopted for air-gap meshing of a 12-slot/10-pole SPM machine. Second, the discrete modeling method is applied in the rotor with eccentric magnets of the machine. The proposed method can decouple the relationship between the number of permeances and the transient solution step size in the interface region. Third, this method uses the current dataset involving carrier harmonics as input excitation to calculate the electromagnetic force. Then, the vibration response is synthesized by electromagnetic force and vibration transfer function. Finally, the computation accuracy and efficiency of this method are validated through the finite element method and experimental test.