Verification of the outlet edge cogging force at the Permanent Magnet Linear Synchronous Motor for long-distance transportation system

Abstract

Recently, in order to resolve the problem of high cost, we have proposed the stationary discontinuous armature Permanent Magnet Linear Synchronous Motor (PM-LSM) in which the armature is engaged only when accelerated and decelerated operations are necessary, when PM-LSM is used with long-distance transportation systems in factories. However, the stationary discontinuous armature PM-LSM contains the outlet edges which always exist as a result of the discontinuous arrangement of the armature. For this reason, cogging force generated between the “entrance end” and the “exit end” has become a problem. Therefore, we have examined the outlet edge cogging force by deforming the shape of the outlet edge at the armature and installing the auxiliary pole at the mover in order to minimize the cogging force generated when the armature is arranged discontinuously. This paper presents the results of 2-D numerical analysis by FEM of the cogging force exerted by the outlet edge.