Steady-State and Transient Performance of Axial-Field Eddy-Current Coupling

This paper presents an approach for quick calculation of steady-state and transient performances of an axial-field eddy-current coupling. Based on a 2-D approximation of the magnetic field distribution, a simple analytical expression for the transmitted torque is first developed. This expression is valid for low slip values, which correspond to the normal working area of such devices (high efficiency). The proposed torque formula is then used to study the steady-state (constant-speed operations) and the transient performances of the coupling (small variations of the slip speed). The results are compared with those obtained from 3-D finite elements simulations and tests. It is shown that good agreements are obtained.