The numerical calculation of eddy-current Field and temperature field for insulation shell of permanent magnet shaft coupling

In order to solve the problem of medium leakiness of permanent magnet shaft coupling (PMSC) at its running, an insulation shell is mounted between the inner rotor and outer rotor of PMSC. When PMSC is working, the magnet field in insulation shell would alternate and resulted in the eddy current, which lead to the problem of eddy current losses and temperature rise of insulation shell. In this paper, the eddy current field of PMSC insulation shell is calculated using 2D finite element method, and the eddy current distribution and eddy current losses of insulation shell are obtained. Based on the analysis, using the coefficient of heat emission obtained according to the theory of fluid similarity, the 3D transient temperature field of PMSC is calculated. The curves between eddy current losses, temperature of insulation shell and material resistivity of insulation shell, rational speed of PMSC are gained, which could be referred in the design of PMSC.