DESIGN OF PERMANENT MAGNET HYBRID STEPPER MOTOR FOR COGGING TORQUE REDUCTION BY FINITE ELEMENT METHOD USING PDETOOL

Abstract

This paper is focused on the design of Permanent Magnet Hybrid (PMH) stepper motor magnetic circuit for two Topologies by Finite Element method (FEM) using Partial Differential Equation Tool (PDETOOL) of MATLAB. Two Topologies are; one without extra teeth between main stator poles and the other one is with extra teeth between main stator poles. These two Topologies are analyzed with two different core materials at its half load and full load. Using the results of magnetic potential of these two topologies for above four conditions; a better Topology is concluded which gives rated steady-state torque at rated drive current by reducing cogging torque. A novel experimental method is explained to measure the steady-state torque using PMH stepper motor-generator set.