Conceptual design of a SC HTS linear motor

Abstract

OSWALD Elektromotoren GmbH, Miltenberg, Germany, is experienced in direct linear motors with high power density. For some special applications the requirements are extremely demanding and almost beyond reach, even for state-of-the-art linear motors operated at room temperature. In order to obtain even higher power density, and hence also increased acceleration, we have to develop a new technology for linear motors. In this paper we propose a round superconducting linear motor. The stator windings will be made of YBCO coated conductors in the shape of double pancake coils. The frequency will be limited to approximately 10 Hz for this application. The actuator will be provided with NdFeB permanent magnets. The special cryogenic design will be discussed. The cooling of the stator will be provided by lN2 at 77 K or lower. The calculated force of this SC linear motor is 10 000 N. The force density will be 2–3 times more than the normal conducting counterpart of the same dimensions.