Mathematical model and experimental study of a magnet coupling with a stop

The paper presents an improved analytical model for axial-flux eddy-current couplings with permanent magnets. The design procedure is based on the torque formula derived from a two-dimensional approximation of the magnetic field distribution. The developed model takes into account the heating of the copper disk and magnets due to the high slip speed. Another advantage of the developed model is the reduction in computation time compared to 3-D finite element simulations. The model is validated experimentally. A correlation between the model and the experiment is obtained. The coupling torque is subject to reduction due to low manufacturing accuracy. The model is effective for engineering use at the design stage of magnet couplings, especially for cable drums of cranes.