Analytical prediction of the cogging torque in external-rotor single-phase BLDC motors with tapered air-gap

Abstract

The proposed study analyzes the cogging torque of a single-phase BLDC motor with a tapered air-gap through use of a proposed analytical method with asymmetric slot function. Usefulness of the proposed analytical method was confirmed via comparison of cogging torque characteristics predicted through use of the proposed method against those predicted by 2-D finite element analysis as well as those observed experimentally.