Static-FE Harmonic Analysis of PM Slip Couplers

In this paper, a 2-D static finite element (S-FE) analysis method of a slip-magnetic coupling is proposed. The FE analysis method uses the frozen permeability technique, which allows the user to accurately determine the relevant model parameters by including the effects of saturation and cross-coupling. Moreover, the proposed analysis method accurately predicts the zero-sequence (3rd harmonic) and higher-order harmonic induced voltages and currents which are present in magnetic couplings. It is found that the zero-sequence and higher-order harmonic currents contribute to the net-torque of the magnetic coupling and their effects are more prevalent at low loads. The method is verified by means of comparing its results to those obtained from a commercial transient FE (T-FE) package. The S-FE method solutions are verified over a wide slip range, and are shown to be significantly less computationally time intensive compared to the T-FE package.