Modeling of Vibration Drive by Electromagnetic Field for Rotary Permanent Magnet

A theoretical modeling method and the experimental verification for a proposed principle of rotary permanent magnet drive excited by electromagnetic field are presented in this paper.Electromagnetic torque of a permanent magnetic rotor under electromagnetic excitation is usually a nonlinear function of external electromagnetic field and its rotary angle.So,it is difficult to compute the electromagnetic torque directly by using common electromagnetic analysis methods.Based on surface magnetic charge,this study searches for a numerical method for calculating the drive torque with the electromagnetic field applied to the rotary permanent magnet.Meanwhile,the theoretical model for analyzing the relation of the torque of the combined magnetic field versus the excitation current and the rotary angle of the permanent magnet is established.This model may present a quasi-static and dynamic vibration drive process of the rotary permanent magnet under electromagnetic field excitation.The research finally validates the theoretical analysis and modeling method by experimental tests in terms of modeling accuracy and applicability of this theory in vibration drive.