Study on the Calculation of Magnetic Force Based on the Equivalent Magnetic Charge Method

Magnetic drivers have been used widely in the pharmaceutical, chemical, petroleum, food and other industries with its perfect sealing without contact. Common method of calculating of the magnetic force are the Maxwell equations, empirical formulas, and he equivalent magnetic charge method as well. The Maxwell equations method is the most complicated and the empirical formulas method is the simplest with low accuracy. The equivalent magnetic charge method is simpler than the Maxwell equations method and more accurate than the empirical formulas method. In this paper, the magnetic force of the magnetic driver of reciprocate in line is calculated with the equivalent magnetic charge method and was compared with the experiment.