A Robust Structure Design of TFPM Synchronous Motor against Demagnetization

Abstract

Among the materials used in a PM machines, the permanent magnets have the greatest variations in properties because of high armature reaction fields or temperature changes. Irreversible demagnetization phenomenon in permanent magnets is one of the causes of reduction in machine performance characteristics. So investigation the behavior of PM machine against demagnetizing situation is important things which must be taken into account in machine design process. In this paper, a suitable design of permanent magnet motor, according to the transverse flux principle is proposed to provide a robust structure against demagnetization. Then the demagnetization phenomenon and its leading affects are studied through a transient analysis coupled with 3D finite element analysis. The FEM analysis of new design of TFPM motor shows the ability of proposed structure against demagnetization.