Optimising Stator Design of a Single Phase PM BLDC Motor for Improved Cogging Torque Profile

Abstract

In the paper is presented a step-by-step development of the topology for a novel single phase permanent magnet (PM) brushless DC (BLDC) motor, aiming to improve its performance at more efficient utilisation of the active materials. The studied motor is based on a generic design, where asymmetrical, particularly shaped stator poles and respective shaping of the permanent magnets is applied. Accurate 2D finite element simulations were employed for numerical prototyping of the motor design, until the expected results were obtained. Based on FEA, cogging and static torque waveforms, along with other relevant performance characteristics are examined. The results show that the novel motor design and, in particular, the specific shape of the stator poles have the most important impact on the smooth operation of the studied single phase BLDC permanent magnet motor