Affiliations: [a] School of Electrical Engineering, Wuhan University, Wuhan 430072, Hubei, China | [b] School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, Jiangsu, China
Correspondence:
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Corresponding author: Junhua Wang, School of Electrical Engineering, Wuhan University, No. 8 Donghu South Road, Wuhan 430072, Hubei, China. Tel./Fax: +86 2768776608; E-mail: junhuawang@whu.edu.cn.
Abstract: This paper focuses on the electromagnetic properties of new cylinder type twelve-pole permanent magnet eddy current coupling. By combining conventional equivalent magnetic charge method and superposition principle, the analytical calculation model of air gap magnetic field distribution for the cylinder type permanent magnet eddy current coupling is established; by considering the skin effect, the analytical model of eddy current density is set; the analytical model of electromagnetic-transfer torque is given with the demagnetization effect taken into consideration. Based on the established analytical calculation model, the variation law of air-gap magnetic induction intensity, eddy current density distribution and magnetic torque characteristic curve are analyzed and plotted in detail. At the same time, finite element simulations of the air gap magnetic field, eddy current density and electromagnetic-transfer torque are carried out based on multi-physics, and the results are compared with analytical calculations. Moreover, the paper analyzed the thickness of magnet conductive plate impacts on eddy current and explored relations between torque and coupling distance under different pole pairs. Finally, in order to verify the simulations, the prototype test of torque transfer characteristics is carried out. This paper compares the experimental results with the theoretical analysis and simulation results, and finds out the error is within the allowable range.
Keywords: Permanent magnet eddy current coupling, magnetic field, eddy current, magnetic torque, FEM
