Design of impulse magnetizing fixtures for the radial homopolar magnetization of isotropic NdFeB ring magnets

This paper is concerned with the design of homopolar impulse-magnetization fixtures for isotropic NdFeB ring magnets, It discusses the merits of vario us fixture topologies and describes a design methodology that employs both analytical and finite-element techniques. It illustrates the utility of the design methodology by presenting a case study of the homopolar magnetizati on of annular isotropic NdFeB ring magnets for use in a tubular, linear per manent-magnet actuator. It examines the influence of the aspect ratio of th e magnets on the actuator air gap flux density profile, and it compares pre dictions and measurements for different fixture designs.