Improvement of short primary member linear induction motor performance by partial adoption of the wound secondary

In this paper, the authors propose the partial adoption of wound secondary members in single-sided linear motors with short primary members. Adopting this scheme in sections where the light driving or braking force is required, desirable performance can be obtained by controlling secondary resistances. Here, they deal with the various scheme of primary and secondary winding connection in the proposed scheme. Further, by using three-dimensional analysis, they also clarify various transient phenomena at the time when the primary crosses the boundary between the solid-plate secondary section and the wound secondary one. As a result, independent short-circuited connection is appropriate for the secondary winding owing to its superior performance and simple structure. Parallel connection is also appropriate for the primary winding owing to its stable transient performance when the primary crosses a boundary of different secondary structures. Moreover, the authors propose a novel boundary structure, which yields stable transient performances.