Abstract
An electromagnetic gear has been developed for variable-transmission applications such as wind power generators and electric hoists. It overcomes the problems of friction, noise, and the need for oil lubrication, which its mechanical counterparts suffer from. This paper explains how the gear operates according to the principle of magnetic gearing and how the concept of pole changing is utilized to change the gear ratio. The transmitted torques are derived and expressed in terms of the physical dimensions, and the optimization factors are identified. Simulation and experimental results confirmed the validity of the developed approach.
