Steady-state and transient analysis of an axial-field magnetic coupling

In this paper, a theoretical analysis of an axial magnetic coupling is presented, leading to a simple expression of the electromagnetic torque. This expression is obtained by using a two-dimensional (2-D) approximation of the magnetic coupling geometry (mean radius model). The analytical model is based on boundary value problems with Fourier analysis (first harmonic approximation). The proposed model is then used to study the steady-state and the transient performances of the coupling. The results are then compared with those obtained from 3-D finite elements simulations and experimental ones.