Transforming conventional magnet assembly to Halbach array: A double-sided linear motor case

Abstract

In this paper, an electromagnetic analysis study of a double-sided linear permanent magnet (PM) motor topology is conducted both for conventional and Halbach array magnet assemblies. Halbach arrays can condense flux lines on the one side of magnet assembly and cancel them on the reverse side, so they enable light motor structures due to the lack of back iron material. By means of the analyses, the critical performance criteria of linear motor are investigated. The designs are verified experimentally. The induced voltages and force production of prototype motors are captured to validate the design study. The findings show that Halbach array magnet assembly type linear motor has superiority for force production and lightness of design.