Thrust characteristic comparison between axial magnetization and quasi-Halbach magnetization of circular shaft motor

This paper presents a circular shaft motor (CSM) model adopting quasi-Halbach magnetization. Tubular linear permanent magnet machine with quasi-Halbach magnetization can realize high flux density and low thrust ripple. The quasi-Halbach CSM model is analyzed by magnetic field analysis and compared with CSM model implementing trapezoidal ring magnets in thrust characteristics. In addition, by investigating the magnetic field distributions of each model, the effect of improving thrust characteristic is verified. Moreover, thrust characteristics are more improved in quasi-Halbach CSM model by shortening pole-pitch angle.