Performance Comparison of Stator Permanent Magnet Hybrid Stepper Motors with Four, Five and Six-Tooth Configurations

In industrial applications that require low-cost positioning and high torque, stator permanent magnet hybrid stepper motors (SPMHSMs) possess significant application potential. The torque of the SPMHSM is related to the number of teeth per stator pole. However, few studies have analyzed the effect of the number of stator teeth on motor performance. To this end, in this study, we designed SPMHSMs with four, five and six-tooth configurations. First, the topology of the SPMHSM is introduced and its operating principle is analyzed. Next, the three motors are designed with the same PM and electrical load. Lastly, we analyzed the electromagnetic performance of these three motors in terms of several factors including magnetic flux distribution, back electromotive force, detent torque, and output torque. The obtained results show that the output torque of the SPMHSMs with five and six-tooth configurations is 2.61% and 3.26% higher than that of the SPMHSM with four-tooth configuration, whereas that with a four-tooth configuration has a wilder torque-current range.