切向励磁型磁场调制电机的附加磁动势及其抑制技术综述

doi:10.19595/j.cnki.1000-6753.tces.241905

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Abstract Due to their small equivalent airgap length and high flux-focusing capability, spoke-array flux modulation permanent magnet (SA-FMPM) machines offer the advantage of high torque density, thus having great potential in low-speed, direct-drive applications. However, the “flux barrier effect” that exists in SA-FMPM machines becomes an obstacle to enhancing the flux modulation effect and torque capacity. The key is to suppress the additional magnetic-motive-force (MMF). This paper explores the additional MMF in SA-FMPM machines, with a focus on its suppression technologies.
Firstly, this paper introduces the generation mechanism of the additional MMF from the magnetic potential drop and the magnetic circuit aspects—the additional MMF results from the fluctuating unequal magnetic potential of each rotor's ferromagnetic poles over time. The defining formulas and mathematical models are developed to quantify the magnetic potential fluctuation, and the detrimental effects of additional MMF on motor performance are analyzed. Secondly, this paper presents three types of effective additional MMF suppression strategies: weakening or eliminating magnetic potential fluctuations, designing flux barriers or flux bridges, and optimizing magnet arrangement. The interrelations and distinctions of these strategies are also analyzed. The existing spoke-array permanent magnet machine topologies and the structural innovations in suppressing additional MMF are overviewed. Their advantages and disadvantages are summarized and evaluated as follows. (1) The principle underlying the weakening/elimination of magnetic potential fluctuations lies in forcing the homopolar rotor ferromagnetic poles to have equal magnetic potential by adding an iron yoke. The other approach is to compensate for the variation in lumped magnetic conductance during rotor rotation. Specifically, the single-bridge, double-bridge, and double-stator topologies are derived. These topologies can significantly weaken the additional MMF, and some can eliminate the magnetic potential fluctuation. However, the machine’s overload capacity is poor due to its easy saturation. (2) The flux barrier/flux bridge design can lead to variations in magnetic reluctance. The core ideal is to achieve the dual change of both “magnetomotive-force unit” and “permeance unit”. The relevant designs include H-, C-, U-, and V-shaped asymmetric flux barrier/bridge structures. These topologies can improve the flux modulation effect, but are limited in suppressing additional MMF. (3) The ideal of magnet arrangement optimization utilizes the “electromagnetic superimposition” theory to improve the flux-focusing ability. Alternatively, the reluctance torque is introduced to compensate for the torque component weakened by additional MMF. The derived topologies are classified into reinforced flux-focusing magnet and spoke-array interior magnet designs. These topologies can reduce flux leakage and enhance primitive PM-excited MMF or synthetic torque, but generate non-working harmonics, thereby increasing losses.
This paper discusses the connections between additional MMF and the existing high-performance machine design techniques from rotor-side, stator-side, and harmonic synergetic optimization design perspectives. Moreover, various machine design techniques are further elaborated. The existence of additional MMF is extended to other magnet-inserted machines. Finally, this paper suggests future research directions for additional MMF phenomena.

Key words： Additional magnetic motive force spoke-array flux modulation permanent magnet (SA-FMPM) machines magnetic potential fluctuation torque performance

Received: 25 October 2024

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	Fang Ying
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	Li Dawei
	Qu Ronghai

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Fang Ying,Liang Ziyi,Li Dawei等. Overview of Additional Magnetic Motive Force in Spoke-Array Flux Modulation Permanent Magnet Machines and Its Suppression Technologies[J]. Transactions of China Electrotechnical Society, 2025, 40(22): 7107-7126.

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