Two Phase Dual-Stator Axial-Flux PM BLDC Motor With Ironless Rotor Using Only-Pull Drive Technique

Abstract

This paper proposes a two-phase dual-stator axial-flux permanent magnet brushless dc motor with an ironless rotor for higher torque per magnet volume using the only-pull drive technique. The advantage of the ironless rotor is that it reduces magnet volume by providing an effective flux linkage, while the onlypull drive technique, which involves only the pull process, benefits from the use of thin magnets that do not experience the irreversible demagnetization. The axial-flux configuration of the proposed dual-stator motor was adopted because of its capability of achieving the desired trapezoidal back electromotive force that maximizes the advantages of the only-pull drive technique. The thin magnets were fixed on the ironless rotor using a non-magnetic structure, and the stator was particularly designed to implement the only-pull drive technique. The performance of the motor was analyzed in terms of torque per magnet volume using the finite element analysis and validated by the experimental results.

Fault-Tolerant BLDC Motor-Driven Pump for Fluids With Unknown Specific Gravity: An Experimental Approach

“…Authors reported three different radial flux BLDC motors in [24] and compare their performance in delivering mechanical power. Yazdanet al in [25] describe a two-phase BLDC motor design. They design motor with iron-less rotor using pull drive technique.…”

Design and Analysis of a Dual Airgap Radial Flux Permanent Magnet Vernier Machine with Yokeless Rotor

“…This saturation may lead to the asymmetric flux distribution as well as heat production in the rotor core [23]. The PM brushless DC (BLDC) machine with improved techniques for torque per magnet volume was presented in [24]. However, the issues of reduced flux linkage between two stators due to the sandwiched rotor yoke in radial type PMVM were not addressed in the literature.…”