The Permanent Magnet Eddy Current Heat Effects Of Factors, Two-dimensional Electromagnetic Finite Element Analysis

In accordance with the electromagnetic induction law, movement of metal materials in magnetic field will produce heat, which means mechanical energy is transformed to heat energy. The transformation efficiency is determined not only by system structure, but also by material.In this paper, finite element analysis of static electromagnetic field on permanent magnet eddy current heat device was carried out with Maxwell 2D, the way to improve heat power was got with the relation between gas-gap magnetic induction and eddy current heat power: to reduce the gas-gap between stator and rotor; to add the number of rotor pole properly; to optimize design parameters of every magnetic pole (shape of permanent magnet, thickness of transitional magnetic yoke, width of the top of magnetic pole). Two kinds of plate models was established for the simplifying of heat device, the phenomenon of magnetic flux leakage in the condition of smaller magnetic pole spacing was simulated and analyzed, the proper width of gas-gap and optimal magnetic pole for different kind of model was got.The kinematics simulation of heat device was carried out with transient field solver of Maxwell 2D, the transient torque and distribution eddy current field of heat device was got, the heat power of heat device was calculated with the relation between transient torque and heat power. The approximate square relation between rotor speed and heat power was got by changing the parameters which affect heat power; heat power will be improved with smaller gas-gap and proper more number of magnetic pole.The ferromagnetic materials which has high magnetic saturation, high characteristics of magnetic conductive and low remanence should be chosen first for the higher heat power.