Development and evaluation of an axial gap motor with neodymium bonded magnet

Tsunata, Ren; Takemoto, Mikio; Ogasawara, Satoshi; Watanabe, Asako; Ueno, Tomoyuki; Yamada, Koji

doi:10.1109/icelmach.2016.7732538

Cited by 5 publications

(2 citation statements)

References 9 publications

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“…An alternative to rare-earth sintered magnets can be bonded magnets, in which eddy current loss is almost absent. The remanence of bonded magnets is lower than that of sintered rare-earth magnets, but the cost of low-power motors with bonded magnets is lower compared to motors with sintered rare-earth magnets because of the simpler manufacturing technology and also the lower material cost [18][19][20]. For this reason, the use of motors with bonded magnets is also prospective in low-cost applications.…”

Section: Introductionmentioning

confidence: 99%

Optimal Design of a High-Speed Flux Reversal Motor with Bonded Rare-Earth Permanent Magnets

2021

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Single-phase flux reversal motors (FRMs) with sintered rare-earth permanent magnets on the stator for low-cost high-speed applications have a reliable rotor and a good specific power. However, to reduce eddy current loss, the sintered rare-earth magnets on the stator have to be segmented into several pieces and their cost increases with the number of magnet segments. An alternative to the sintered magnets can be bonded magnets, in which eddy current loss is almost absent. The remanence of bonded magnets is lower than that of sintered magnets, and they are prone to demagnetization. However, the cost of low-power motors with bonded magnets can be lower because of the simpler manufacturing technology and the lower material cost. This paper discusses various aspects of the optimal design of FRM with bonded magnets, applying the Nelder–Mead method. An objective function for optimizing an FRM with bonded magnets is designed to ensure the required efficiency, reduce torque oscillations, and prevent the bonded magnets from demagnetizing. As a result, it is shown that the FRM with bonded magnets has approximately the same efficiency as the FRM with sintered magnets. In addition, the peak-to-peak torque ripple is minimized and the minimal instantaneous torque is maximized.

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Section: Introductionmentioning

confidence: 99%

Optimal Design of a High-Speed Flux Reversal Motor with Bonded Rare-Earth Permanent Magnets

2021

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“…In the field of electrical machines various solutions have been proposed with the adoption of new designs of the magnetic circuits, to improve the performance of electromechanical and electromagnetic devices [2], [3]. For this propose, new magnetic materials are being studied in recent years and have been adopted in partial or total substitution of traditional ones [4]- [6]. Dealing with permanent magnets, the use of NdFeB bonded magnets in place of ferrites and, in some occasions, of NdFeB sintered magnets, permits to obtain magnets in complex net shapes with very good magnetic characteristics [7], [8].…”

Section: Introductionmentioning

confidence: 99%

Effect of Granulometry and Oxygen Content on SMC Magnetic Properties

Pošković¹,

Franchini²,

Grande

et al. 2017

Acta Metall Slovaca

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The interest around the adoption of Soft Magnetic Composite materials (SMC) in the realization of electric machines, or parts of electric machines, is continuously increasing. The main reason lies on the opportunity to realize magnetic circuits following a 3D design procedure, which is not allowed with the adoption of the traditional lamination sheets. This is not the only reason, as a lot of research is being carried out on the losses distribution in the magnetic material, particularly as function of the frequency. In this paper different iron powders have been analyzed to investigate the impact of the granulometry on the SMC performance; in particular the grain size and the oxygen content have been considered variable parameters. The materials, prepared, compacted and tested in our laboratories, have been characterized to obtain the magnetic characteristic and information about the iron losses.

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