Abstract
Recently, linear motors capable of transmitting motive power without the use of mechanical converters have been attracting attention as drive sources for transportation systems, and there have been practical implementations of linear induction motors and linear synchronous motors. The authors have been engaged in developing transportation applications of permanent magnet linear synchronous motors using high-energy magnetic materials. We have proposed a discontinuous armature LSM in witch the armature side is engaged only when accelerated/decelerated operation is necessary, instead of one in which thrust is constantly applied. However, an outlet edge certainly exists, because the armature uses a discontinuous arrangement method. This edge becomes a problem, because the cogging force that it exerts influences the controllability of the motor. This paper presents the results of an experimental examination and three-dimensional analysis of the cogging force exerted by the outlet edge. We deformed the shape of the armature to decrease the cogging force at the outlet edge, and the results are examined by using three-dimensional analysis.
