Comparison of output characteristics of a permanent-magnet and a field-winding DC starter motor

Abstract

The influence of magnetic saturation on electromagnetic field distribution in both permanent-magnet direct current (PMDC) and field winding (wound field) direct-current (FWDC) motors with the same output mechanical power, have been studied. In this paper, an approximate analytical method and Finite Element Method (FEM) are used for prediction of air gap flux density distribution. No-load and rotor-lucked conditions, according to experimental measurements, and the FEM and analytical method studies of the motor, have been studied. A sensitivity analysis has also been done on the major design parameters that affect motor performance. At last, these two DC motors are compared, in spite of their differences, on the basis of measured output characteristics.