Design and analysis of helical motion permanent magnet motor with cylindrical Halbach array

This paper deals with the application of cylindrical Halbach array to a permanent magnet motor capable of producing pure rotary motion, pure linear motion, or helical motion. The proposed motor consists of an exterior polar Halbach quadrupole array for a rotary motion and an interior cylindrical Halbach dipole array for a linear one. The two-dimensional finite-element method is employed for predicting the effect of design parameters of the machine.