The Calculation of Magnetic Field in Magnetic Drivers Based on Equivalent Magnet Charge Theory

A 3D analytical model between magnetic induction intensity and the radius of isolating disc etc. was deduced and the magnetic field distribution was analyzed by theory of equivalent magnet charge. The spatial distribution of the magnetic flux density and the influencing law of parameters on the torque were obtained in a magnetic driver with 12 poles by Matlab programming. Our work can provide a basis for the optimum design of magnetic drivers and study of eddy current.