Fast Analysis Method of Eddy Current Fields for Rotating Machines

Abstract

We have presented a fast analysis method of eddy current fields for rotating machines. In the method, the entire analytic space is separated into two spaces; a rotor space and a stator space. First a static magnetic field is analyzed to obtain slip surface fields over a half period of rotation while eddy current fields are disregarded. The obtained slip surface fields are transformed into several complex time-dependent harmonic waves, which are used as boundary conditions of the rotor and stator spaces in the separated space analysis with eddy current fields considered. The obtained eddy currents are introduced as new additional sources of magnetic field in the entire analytic space in order to correct the slip surface fields. The new slip surface fields are used as the new boundary conditions of the rotor and stator spaces. The above mentioned process is repeated several times until the eddy current field solution is converged.