Experimental and Theoretical Analyses of Axial Magnetic Coupling Under Steady-State and Transient Operations

This paper investigates the steady-state and transient performances of an axial magnetic coupling by using analytical formulas issued from an analytical model based on a 2-D approximation for the magnetic field distribution (mean radius model). From the magnetic field expression, simple analytical formulas are derived for computing the pull-out torque and the torsional stiffness of the coupling as a function of the geometrical parameters. Here, a special attention is given to the overload torque condition during the transient which leads to the loss of synchronism for the coupling. Moreover, radial and angular misalignment conditions are also studied. In order to study the accuracy of the proposed analytical model, the results are compared with those obtained from 3-D finite-element simulations and measurements.