Effects of Short-Circuit Ring of Linear Dc Motor for High-Speed Positioning.

In recent years, linear dc motors (LDMs) have gained wide popularity in the fields of office and factory automation. As a result,they need higher performance (e.g. high-speed, high-accuracy positioning). This paper deals with the effects of using a short-circuit ring in an LDM to achieve high-speed positioning, as follows: (1) expression of the transient performance of the coil current, (2) effective method of designing the short-circuit ring, and (3) effects of the short-circuit ring on the positioning characteristics.