High-Torque-Density Low-Cost Magnetic Gear Utilizing Hybrid Magnets and Advanced Materials

Al-Qarni, Ali; Wu, Fan; Ei-Refaie, Ayman

doi:10.1109/iemdc.2019.8785338

Cited by 11 publications

(3 citation statements)

References 27 publications

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“…As a consequence, this paper aims to address foregoing PM material challenges and investigate the electromagnetic performance of blended magnet designs proposed for electric vehicles (ferrite with both Dy-NdFeB and Dy-free NdFeB) in the context of FM-MGs and MGMs as to extend the work in [59,60].…”

Section: Objective and Organization Of This Papermentioning

confidence: 99%

Magnetic Gears and Magnetically Geared Machines with Reduced Rare-Earth Elements for Vehicle Applications

Al-Qarni

El-Refaie

2021

WEVJ

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This paper covers a new emerging class of electrical machines, namely, Magnetic Gears (MGs) and Magnetically Geared Machines (MGMs). This particular kind of gears/machines is capable of either scaling up or down the revolutions-per-minute to meet various load profiles as in the case of mechanical gearboxes, but with physical isolation between the rotating components. This physical isolation between the rotational components leads to several advantages in favor of MGs and MGMs over mechanical gearboxes. Although MGs and MGMs can potentially provide a solution for some of the practical issues of mechanical gears, MGs and MGMs have two major challenges that researchers have been trying to address. Those challenges are the high usage of rare-earth Permanent Magnet (PM) materials and the relatively complex mechanical structure of MGs and MGMs, both of which are a consequence of the multi-airgap design. This paper presents designs that reduce the PM rare-earth content for Electric Vehicles (EVs). Additionally, the paper will ensure having practical designs that do not run the risk of permanent demagnetization. The paper will also discuss some new designs to simplify the mechanical structure.

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Section: Objective and Organization Of This Papermentioning

confidence: 99%

Magnetic Gears and Magnetically Geared Machines with Reduced Rare-Earth Elements for Vehicle Applications

Al-Qarni

El-Refaie

2021

WEVJ

Self Cite

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“…The mechanical strength of the MG proposed in [10] is significantly improved because of the spoke-type configuration and, it is demonstrated that this MG can achieve a comparable torque density to mechanical gears. In [11], a high-torque-density spoke-type MG was proposed, and a parameter optimization was performed to obtain the highest torque density. The hybrid utilization of PM materials was investigated in terms of the volumetric torque density (VTD), specific torque, and manufacturing cost of the MG.…”

Section: Introductionmentioning

confidence: 99%

Surrogate-Based Multi-Objective Optimization of Flux-Focusing Halbach Coaxial Magnetic Gear

Shoaei,

Farshbaf-Roomi,

Wang

2024

Energies

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Due to their contact-free and low-maintenance features, magnetic gears (MGs) have been increasingly investigated to amplify the torque of electric motors in electric vehicles (EVs). In order to meet the requirements of propelling EVs, it is essential to design an MG with a high torque density. In this paper, a novel flux-focusing Halbach coaxial MG (FFH-CMG) is proposed, which combines the advantages of flux focusing and Halbach permanent magnet (PM) arrays. The proposed structure has a higher torque performance and greater efficiency than conventional structures. A multi-objective design optimization based on a surrogate model is implemented to achieve the maximum volumetric torque density (VTD), torque-per-PM volume (TPMV), and efficiency, as well as the minimum torque ripple, in the proposed FFH-CMG. The employed optimization approach has a higher accuracy and is less time-consuming compared to the conventional optimization methods based on direct finite-element analysis (FEA). The performance of the proposed FFH-CMG is then investigated through 2D-FEA. According to the simulation results, the optimized FFH-CMG can achieve a VTD of 411 kNm/m3, and a TPMV of 830 kNm/m3, which are significantly larger than those of the existing MGs and make the proposed FFH-CMG very suitable for EV applications.

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“…AGNETIC gears have attracted much attention due to the advantages of free-of-contact, inherent overload capability, silent operation, and high reliability compared with mechanical gears [1], [2]. The coaxial magnetic gear (CMG), which comprises coaxial inner and outer rotors on the two sides of ferromagnetic segments, realizes a better utilization of PMs and transmits significantly higher torque density compared with other types of MGs [3], [4]. Therefore, CMGs have been employed in critical environments to meet the high requirement and harsh working conditions.…”

Section: Introductionmentioning

confidence: 99%

Fast Magnetic Field Approximation Method for Simulation of Coaxial Magnetic Gears Using AI

Niu

Zhang

et al. 2023

IEEE J. Emerg. Sel. Top. Ind. Electron.

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High-Torque-Density Low-Cost Magnetic Gear Utilizing Hybrid Magnets and Advanced Materials

Cited by 11 publications

References 27 publications

Magnetic Gears and Magnetically Geared Machines with Reduced Rare-Earth Elements for Vehicle Applications

Magnetic Gears and Magnetically Geared Machines with Reduced Rare-Earth Elements for Vehicle Applications

Surrogate-Based Multi-Objective Optimization of Flux-Focusing Halbach Coaxial Magnetic Gear

Fast Magnetic Field Approximation Method for Simulation of Coaxial Magnetic Gears Using AI

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