Modeling and comparison of superconducting linear actuators for highly dynamic motion

Abstract

This paper presents a numerical modeling method for AC losses in highly dynamic linear actuators with high temperature superconducting (HTS) tapes. The AC losses and generated force of two actuators, with different placement of the cryostats, are compared. In these actuators, the main loss component in the superconducting tapes are hysteresis losses, which result from both the non-sinusoidal phase currents and move ment of the permanent magnets. The modeling method, based on the H-formulation of the magnetic fields, takes into account permanent magnetization and movement of per manent magnets. Calculated losses as function of the peak phase current of both super conducting actuators are compared to those of an equivalent non-cryogenic actuator.

Experimental and numerical studies of a linear synchronous motor with the secondary made of coated superconductor

“…The thrust and normal forces were studied by experiment [16,17] and finally extended to cases of four connected coated superconducting coils [18]. More recently, De Bruyn et al presented a numerical modeling method based on the H-formulation for AC losses calculation in highly dynamic linear actuators with coated superconducting tapes [19]. In 2014, Martins et al fabricated a single pancake racetrack coil made of the coated superconducting tapes as field windings and the thrust against position under the quasi-static condition has been measured over a conventional copper stator [20].…”

Finite Element Model Simplification Methods for Stacks of Superconducting Tapes

“…These devices include magnetic energy storage, motors and generators, and high-field magnets. Ramping up of a DC current or the application of AC currents to the superconducting coils results in AC losses [1]. In a 2D representation, the pancake or racetrack coils are represented as a stack of superconducting tapes.…”