Optimal Design of Magnetic Resistance of Permanent Magnet Linear Motor

Abstract

Reluctance is an important factor that affects the thrust fluctuation of linear motor. Based on the energy method, this paper carries out the analytical derivation of the linear motor end force and theoretically calculates the linear motor primary length under the minimum end force; The analytical derivation of cogging force is carried out and a unified expression of magnetic resistance based on Fourier series is given based on the Fourier series method. According to the theoretical analytical formula, the magnetic resistance is suppressed by weakening the harmonic amplitude of the magnetic resistance. First, the optimal primary length was verified by finite element model simulation. On this basis, the finite element model of the linear motor with 8 poles and 9 slots and the slotted linear motor was established for simulation verification. Compared with the initial model, the optimized linear motor reluctance The force is reduced by 77.1%, and the simulation results verify the correctness of the theoretical analysis.