Analysis and Design of Moving-Magnet-Type Linear Synchronous Motor for Electromagnetic Launch System

Abstract

The replacement of steam catapults with electromagnetic ones is becoming an overwhelming trend in aircraft launch systems. Recently, the double-sided linear launcher has attracted more and more attention from researchers. This paper presents the design and analysis of the moving-magnet-type permanentmagnet linear synchronous motor (PMLSM). The thrust density is the most important indicator for a powerful motor, so an analytical expression of the thrust-density coefficient is derived from basic electromagnetic force laws. Based on the analytical results, the thrust and the thrust ripple are analyzed using the finite element method in different conditions. In order to modularize easily, the ring windings have been applied in the double-sided PMLSM, and then, the design features and parameter optimization of the windings are discussed. This paper can provide references to select the suitable type of motor for the launch systems and accomplish the fundamental work for the design of a prototype.

Research on Electromagnetic and Dynamic Properties of LPMBLDCM for Electromagnetic Launch

“…It must be recalculated when other parameters have been changed. The influences of gap length, thickness of magnet, pole arc coefficient, number of pole pairs to the average thrust have been already discussed for a double-sided linear synchronous motor used for electromagnetic catapults in [3], and some results are consistent with the computed results in [4]. However, it was found in [5] that the optimization of structural parameter can promote the velocity and thrust properties, in which the essence problem is the elimination of higher harmonics in the Fig.…”

Ultrahigh-Acceleration Moving-Permanent-Magnet Linear Synchronous Motor With a Long Working Range

“…A small air gap between the PM and the EM is effective for achieving a large thrust and high thrust density [31]. However, this makes it difficult to assemble the motor and increases the risk of contact between the PM and the EM.…”

Design considerations of transverse flux linear machines for eelectromagnetic launch applications

“…[1]- [3]. Particular examples include transportation and electromagnetic launch (EML) [4], [5]. In comparison to their rotary-to-linear counterparts, the PMLM offer significant advantages, notably the absence of mechanical gears and transmission systems, which results in a higher efficiency, better dynamic performance, and improved reliability.…”