Simplified Analysis of Nonoverlap Short-Circuited Coil Winding Slip Permanent Magnet Couplers

In this paper, a simplified analysis technique is introduced to allow the dq modeling of a nonoverlap, short-circuited coil winding slip permanent magnet (PM) coupler (S-PMC). The proposed technique for predicting the coil currents using a number of static finite-element (FE) solutions takes the effect of, amongst others, mutual coupling between the coils and layers into account. The technique also allows a difference in the currents of top- and bottom-layer coils, if such coil windings are used. This all makes the method particularly attractive for use in the design optimization of the S-PMC. Excellent correlation with measured and transient FE analysis results was found for a 2.2 kW S-PMC prototype with an efficiency of 97% at a rated load.