Hybrid-Magnet Variable Flux Memory Machine With Improved Field Regulation Capability for Electric Vehicle Applications
Artikel i vetenskaplig tidskrift, 2023

This article aims to investigate a novel hybrid-magnet variable flux memory machine (VFMM) with improved field regulation capability for electric vehicle applications. Two sets of permanent magnets (PMs), i.e., high-energy-density neodymium-iron-boron PM and low coercive force (LCF) PM, are arranged in a delta array to improve field regulation capability and torque density. The machine topology, key features, and operating principle of the presented machine are demonstrated. Based on the simplified magnetic circuit model, the underlying design tradeoffs of the presented machine are revealed qualitatively. The nonlinear magnetic circuit model of the presented machine taking saturation and hybrid-magnet leakage flux into consideration is built for machine analysis. Electromagnetic performance comparisons are carried out by finite element analysis between the presented VFMM and the existing VFMM. The results show that the presented machine can achieve significantly improved flux regulation capability while maintaining the high output torque due to the improved arrangement of hybrid magnetic branches and enhanced flux concentration effect. Finally, the investigated VFMM is prototyped. The operating principle and predicted results are verified by experimental results.

variable flux

Doubly salient

electric vehicle (EV)

switched flux

permanent magnet (PM)

memory machine


Yuming Yan

Nanyang Technological University

Ying Fan

Southeast University

Fawen Shen

Nanyang Technological University

Hao Chen

Chalmers, Elektroteknik, Elkraftteknik

Shun Cai

Nanyang Technological University

Xin Yuan

Hong Kong Polytechnic University

Christopher H.T. Lee

Nanyang Technological University

IEEE Transactions on Transportation Electrification

2332-7782 (eISSN)

Vol. 9 1 586-597


Rymd- och flygteknik

Annan fysik

Annan elektroteknik och elektronik



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