Rare-Earth Free Unity Power Factor Bi-Axial Excitation Synchronous Machine for Traction Applications

Rare-earth-based traction machines are subject to supply chain, geo-political, and price fluctuation issues, which makes rare-earth-free motor topologies attractive for electric vehicle (EV) traction applications. In this research, a 24-slot/4-pole, unity power factor, air-cooled, rare-earth-free bi...

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Published inIEEE transactions on industry applications Vol. 60; no. 4; pp. 5966 - 5978
Main Authors Chattopadhyay, Ritvik, Jung, Junyeong, Islam, Md. Sariful, Boldea, Ion, Husain, Iqbal
Format Journal Article
LanguageEnglish
Published New York IEEE 01.07.2024
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Air gaps
Coils (windings)
Demagnetization
Electric vehicles
Excitation
ferrite magnets
Finite element method
Magnets
Power factor
Prototypes
Rare earth elements
rare-earth free
Reactive power
Rotors
Stator windings
Supply chains
Synchronous machines
Topology
Torque
Traction
traction motor
Two dimensional analysis
Unity
unity power factor
Windings
wound field synchronous machine
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Abstract Rare-earth-based traction machines are subject to supply chain, geo-political, and price fluctuation issues, which makes rare-earth-free motor topologies attractive for electric vehicle (EV) traction applications. In this research, a 24-slot/4-pole, unity power factor, air-cooled, rare-earth-free bi-axial excitation synchronous machine (BESM) with ferrite magnets is explored for traction applications. The proposed machine achieves a unity power factor due to the presence of stator flux countering magnets embedded in the rotor, while the torque-producing component of the rotor flux is produced by DC field windings. A 4.2 kW, 40 Nm BESM is designed using a 2D-finite element analysis (FEA) based optimization, and a prototype is fabricated. The performance of the prototype is experimentally verified up to the rated torque in a dynamometer test setup. Based on the experimental validation of the prototype, a scaled-up 100 kW BESM is designed and characterized using FEA to verify the effectiveness of the proposed concept for high-power traction applications.
AbstractList Rare-earth-based traction machines are subject to supply chain, geo-political, and price fluctuation issues, which makes rare-earth-free motor topologies attractive for electric vehicle (EV) traction applications. In this research, a 24-slot/4-pole, unity power factor, air-cooled, rare-earth-free bi-axial excitation synchronous machine (BESM) with ferrite magnets is explored for traction applications. The proposed machine achieves a unity power factor due to the presence of stator flux countering magnets embedded in the rotor, while the torque-producing component of the rotor flux is produced by DC field windings. A 4.2 kW, 40 Nm BESM is designed using a 2D-finite element analysis (FEA) based optimization, and a prototype is fabricated. The performance of the prototype is experimentally verified up to the rated torque in a dynamometer test setup. Based on the experimental validation of the prototype, a scaled-up 100 kW BESM is designed and characterized using FEA to verify the effectiveness of the proposed concept for high-power traction applications.
Author Islam, Md. Sariful
Boldea, Ion
Jung, Junyeong
Husain, Iqbal
Chattopadhyay, Ritvik
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SubjectTerms Air gaps
Coils (windings)
Demagnetization
Electric vehicles
Excitation
ferrite magnets
Finite element method
Magnets
Power factor
Prototypes
Rare earth elements
rare-earth free
Reactive power
Rotors
Stator windings
Supply chains
Synchronous machines
Topology
Torque
Traction
traction motor
Two dimensional analysis
Unity
unity power factor
Windings
wound field synchronous machine
Title Rare-Earth Free Unity Power Factor Bi-Axial Excitation Synchronous Machine for Traction Applications
URI https://ieeexplore.ieee.org/document/10475491
https://www.proquest.com/docview/3082686983
Volume 60
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