Characteristic Analysis of Bi-and Uni-Polar Reluctance Motor Drives

摘要

Comparative studies on the torque characteristics of reluctance motors for bi-and uni-polar sinusoidal drives are given. A 3-phase test motor with 6/8 stator and rotor pole combination is used for nonlinear FEM analysis and experi- ments. The analysis shows that different flux paths are produced, by bi-and uni-polar current drives, which makes two significant differences in torque-current charac- teristics. Since the unipolar current drive produces a shorter flux path, and therefore a higher air-gap flux density, higher torque for a given winding current can be expected.