Theory for Eddy-Current Couplings

Basic expressions are derived for the relationships between excitation current, speed, and torque of an eddy-current coupling with a solid iron eddy-current member. This paper is concerned only with eddy-current couplings of the inductor or unidirectional flux type; however, the method has been applied also to other types of eddy-current machinery. Necessary approximations are made for the theoretical analysis, and a 5-step procedure is used to develop the resulting relationships.