Modeling of a radial permanent magnet motor with trapezoidal shaped poles

Abstract

For years, design of conventional permanent magnet motors has been limited mainly to the variation of the stator winding function and little research has been made on stator pole modification as an alternative for motor design. Soft magnetic composites (SMCs) have opened up new possibilities for the 3-D pole shape design of both DC and AC machines owing to their isotropic properties, while having low conductivity. Here, a PM motor with trapezoidal shaped poles is presented and simulated. A modified trapezoidal-shaped poles is also proposed as further work, to reduce the torque pulsation. The latter theoretically exhibits zero torque pulsations. Some FEA results are also presented. © 2005 IEEE.