Abstract
Permanent magnetic (PM) gears are magneto-mechanical devices that are widely used to replace the ordinary mechanical gears and to transmit torque without any mechanical contact. In this paper, according to the demagnetization curve of REPM material and the relationship between magnetic density and intensity of magnetization with magnetic medium in the magnetic field, the magnetic analysis model of PM external gear is built, and its magnetic field distribution is calculated by the finite element method (FEM). The transmission torque is calculated by the Maxwell stress tensor method and its characteristics are studied theoretically. In the end, the torque curves of PM gear are given. From the curves, the influences of geometry size, magnet number, transmission ratio, height of yoke of the magnet on transmission torque are obtained. It cannot only forecast the field distribution to a certain extent, estimate the transmission performance, calculate the transmission torque, but also can give a quantitative direction to the optical design and related parameters of PM gear.
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