Flux-Modulated Permanent Magnet Machines: Challenges and Opportunities

Abstract

High torque density is a desirable feature of electrical machines used in traction applications, such as electric vehicle (EV)/hybrid electric vehicle (HEV) propulsion, wind turbines, more electric aircrafts, etc. The flux-modulated permanent magnet (FMPM) machine is considered as one of the most promising candidates to achieve high torque density. The incorporated gearing effect is ideal in reducing the rotating speed and amplifying the output torque of the FMPM machines. This paper aims at a comprehensive review of the topology evolution of the FMPM machines. Based on different structures, the FMPM machines are grouped into four categories: surface-type FMPM machines, spoke-type FMPM machines, partitioned stator FMPM machines, and bidirectional FMPM machines. The operating principles, advantages, drawbacks, and major applications of the FMPM machines are discussed in detail. In the end, the current state of the art, opportunities, challenges, and future trends of the FMPM machines are discussed. Therefore, this paper offers a systematic guidance on the selection and design of the FMPM machines.

Review of Control Topologies for Flux Switching Motor

“…Although there had been many advancements in the design of FSM, researchers started to explore controller algorithms for FSM only after the year 2008 [30]. The review of design topologies (like construction, winding configurations, and converter design) over the years (2005-2019) has been discussed in [27], [28], and [29].…”

A Novel Double Stator Hybrid-Excited Flux Reversal Permanent Magnet Machine With Halbach Arrays for Electric Vehicle Traction Applications

“…Flux regulation capability plays a vital role in evaluating the electromagnetic performance of hybrid excitation machines [12,21]. The flux regulation ratio γ, defined by ( 4) is commonly employed to quantify this effect and is calculated as the ratio between the difference of flux-linkages under fluxenhancing and flux-weakening conditions to the flux-linkage under flux-enhancing [12]: This indicates that while it possesses a strong capability to generate flux, it may face challenges in effectively regulating the flux.…”

Prediction of Stress and Deformation Caused by Magnetic Attraction Force in Modulation Elements in a Magnetically Geared Machine Using Subdomain Modeling

“…Hence, magnetically geared machines (MGMs) have become an increasingly attractive option for integrating permanent magnet synchronous machines (PMSMs) with magnetic gears into one structure. A comprehensive overview of the evolution and various approaches to MGMs has been presented [1][2][3]. Four different winding organizations for MGMs were investigated in [4,5], in which the authors proposed a dual-structure machine that improved the torque and reduced the cogging torque.…”