Hybrid-Magnet Variable Flux Memory Machine With Improved Field Regulation Capability for Electric Vehicle Applications

Yan, Yuming; Fan, Ying; Shen, Fawen; Chen, Hao; Cai, Shibo; Yuan, Xin; Lee, Christopher

doi:10.1109/tte.2022.3188868

Cited by 4 publications

(3 citation statements)

References 36 publications

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“…2. Notably, many research groups have developed variable flux memory motors (VFMM) and hybrid excitation motors (HEM) [7], [12], [13], [14], [15]. VFMMs have variable-flux permanent magnets (VPM) that can change their magnetization ratio (MR) and magnetization direction (MD) by applying a current pulse.…”

Section: Structure and Mechanical Strength Of Proposed He-vfmmmentioning

confidence: 99%

“…Additionally, VFMMs are classified into AC-magnetized and DC-magnetized type by the magnetization method [4], [5]. Furthermore, each type can be classified into single-PC and hybrid-PM types, and various structures are being studied [6], [7]. In recent years, the hybrid-PM type has been actively investigated because its high output density and high variable magnetic field capacity.…”

Section: Introductionmentioning

confidence: 99%

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Design and Analysis of Hybrid-Excitation Variable Flux Memory Motor for Traction Applications: Improving Output Power in High-Speed Area During Six-Step Operation Mode

Tsunata,

Yokomichi,

Takemoto

et al. 2023

IEEE Access

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Variable flux motors with adjustable magnetic flux have been gaining attention because of their capability to simultaneously achieve a high torque density and high efficiency. In addition, the output power characteristic, which is related to acceleration performance, in high-speed areas is important in traction applications. However, typical traction motors have lower output power in high-speed areas. In this paper, a Hybrid-Excitation Variable Flux Memory Motor (HE-VFMM) is therefore proposed to enhance output power characteristics under six-step operation mode in high-speed area. The proposed HE-VFMM can perform magnetic flux adjustment with two components: field winding and variable flux permanent magnet (VPM), thus dramatically increasing flux adjustment range. The simulation results show the proposed HE-VFMM achieves 23.7% higher output power at 17,000 rpm than that of an existing traction motor in Prius 4th generation that has the same size while maintaining high efficiency in the frequently used operating area. Additionally, it was found that variable magnetic flux is very effective in enhancing the output power, especially in the high-speed region because the magnetic saturation in the stator core is mitigated by fieldweakening control. Consequently, as the rotational speed increases, an increase ratio of the output power caused by the adjustable magnetic flux becomes higher. This paper shows that the proposed HE-VFMM is an effective method for improving the problem of low output power in high-speed regions in traction motors.

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Section: Structure and Mechanical Strength Of Proposed He-vfmmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design and Analysis of Hybrid-Excitation Variable Flux Memory Motor for Traction Applications: Improving Output Power in High-Speed Area During Six-Step Operation Mode

Tsunata,

Yokomichi,

Takemoto

et al. 2023

IEEE Access

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show abstract

“…Neodymium–iron–boron magnets, also known as Nd–Fe–B magnets, have been the most promising permanent magnets since they were introduced to the market in 1984 . Their high-energy product, with a theoretical maximum of 512 kJ/m 3 , makes them particularly useful for enhancing the efficiency of motors and computer hard drives. , Therefore, they are widely used in clean energy, transport, and high-tech applications such as laptop hard drives, electric generators in water turbines, and hybrid and electric vehicles. , Additionally, because lightweight products to support equipment miniaturization is attracting increasing interest, the demand for Nd–Fe–B magnets is also expected to continually increase, particularly in the clean energy and transport sectors. , Hence, the demand for Nd–Fe–B magnets is expected to increase continuously until 2050 . Rare-earth elements (REEs), including Nd and Dy, have become an essential part of modern industry. − Nd–Fe–B magnets contain 31–32 wt % REEs, mainly Nd and some Dy .…”

Section: Introductionmentioning

confidence: 99%

Solvent Extraction of Dy(III) and Nd(III) with an Unsymmetrical Pentanediamide Extractant

Xiong,

Huang,

et al. 2023

Ind. Eng. Chem. Res.

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Recovery of rare-earth elements (REEs), especially those of Dy and Nd, from Nd−Fe−B permanent magnets is crucial for sustainable development. Herein, an unsymmetrical pentanediamide extractant, N,N′-dimethyl-N,N′-didecyl-3-oxapentanediamide (DMDDOPDA), was synthesized and characterized for the effective extraction of Dy(III) and Nd(III). DMDDOPDA can form coordination bonds with metal ions because of the strong electron-donating abilities of the N and O atoms. The coordination sites might be inclined toward one side during the extraction. DMDDOPDA exhibited superior extraction performance in the HNO 3 system than it did in the HCl system. The highest extraction efficiencies of Dy(III) and Nd(III) under optimal conditions were 99.9% and 99.5%, respectively, while their optimum stripping efficiencies were 100% and 85.3%, respectively. DMDDOPDA extraction of Dy(III) and Nd(III) in the four investigated diluents involved the formation of a neutral coordination complex. This study provides new insights into REE extraction using pentanediamide extractants.

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A Review of Recent Topologies of Variable Flux Machines

Badahdah,

El-Refaie

2024

2024 International Conference on Electrical Machines (ICEM)

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Hybrid-Magnet Variable Flux Memory Machine With Improved Field Regulation Capability for Electric Vehicle Applications

Cited by 4 publications

References 36 publications

Design and Analysis of Hybrid-Excitation Variable Flux Memory Motor for Traction Applications: Improving Output Power in High-Speed Area During Six-Step Operation Mode

Design and Analysis of Hybrid-Excitation Variable Flux Memory Motor for Traction Applications: Improving Output Power in High-Speed Area During Six-Step Operation Mode

Solvent Extraction of Dy(III) and Nd(III) with an Unsymmetrical Pentanediamide Extractant

A Review of Recent Topologies of Variable Flux Machines

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