Abstract
The rare-earth (RE) permanent magnets (PM) have been increasingly adopted in traction motor application. However, the RE PM is expensive, less abundant, and has cost uncertainties due to limited market suppliers. This paper presents a new design of a RE-free five-phase ferrite permanent magnet-assisted synchronous reluctance motor (Fe-PMaSynRM) with the external rotor architecture with a high saliency ratio. In such architecture, the low magnetic coercivity and demagnetization risk of the ferrite PM is the challenge. This limits the number of flux barriers, saliency ratio, and reluctance torque. A precise analytical design procedure of rotor and stator configuration is presented with differential evolution numerical optimizations by utilizing a lumped parameter model. A 3.7 kW prototype is fabricated to validate the proposed idea.
Highlights
High torque density traction motors have been designed with rare-earth material alloys such as neodymium-ferrite-boron (Nd2 Fe14 B), samarium-cobalt (Sm-Co), and dysprosiumferrite-boron (Dy2 Fe14 B) [1,2,3,4]
Interior permanent magnet (IPM) machines with rare-earth magnets have been utilized in tractions motor application [4,11,12]
Economical rare-earth-free Fe-PMaSynRM designs can be optimally designed to better the performance of traction motor designs
Summary
High torque density traction motors have been designed with rare-earth material alloys such as neodymium-ferrite-boron (Nd2 Fe14 B), samarium-cobalt (Sm-Co), and dysprosiumferrite-boron (Dy2 Fe14 B) [1,2,3,4]. Low-cost ferrite permanent magnets (Fe-PM) such as Y30 and Y32H grades PMs have been considered alternative options in the industry [4,5]. Fe-PMaSynRM can offer low-cost, better constant power-speed range, and comparable torque density compared to RE-PM-based
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