Designing a Magnetic Gear for an Electric Aircraft Drivetrain

Wong, Ho Yin; Baninajar, Hossein; Dechant, Bertrand; Bird, Jonathan Z.

doi:10.1109/ecce44975.2020.9235977

Cited by 14 publications

(5 citation statements)

References 13 publications

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“…According to the required torque-speed levels of the considered application for the proposed FFH-CMG, a gear ratio of around 6 could be a suitable choice. To ensure the minimum torque ripple and noise, a non-integer gear ratio should be selected [32]. Furthermore, the number of ferromagnetic pole pieces in the cage rotor should be even to avoid detrimental, unbalanced radial forces being found in the modulation ring [33].…”

Section: Optimal Pole Pair Combinationmentioning

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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Section: Optimal Pole Pair Combinationmentioning

confidence: 99%

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

Shoaei,

Farshbaf-Roomi,

Wang

2024

Energies

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“…Design of an FMMG applied to the electric aircraft drivetrain is presented in ref. [168]. Merits of using the FMMG or the MGPM machine in the electric aircraft drivetrain are discussed in ref.…”

Section: Potential Applications and Existent Challengesmentioning

confidence: 99%

A review on the field‐modulated magnetic gears: Development status, potential applications, and existent challenges

Yan,

Li,

Wang

et al. 2023

IET Electric Power Appl

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As a type of magnetic device being able to realize contact‐free power transmission together with sufficient volumetric torque density, the field‐modulated magnetic gear (FMMG) has become a promising alternative to the mechanical gear having rigid construction yet suffering lots of issues generated by the continuous teeth friction. The conventional magnetic gears (MGs) that behave as simple copies of their mechanical counterparts and can be roughly defined as origination of the FMMG are briefly introduced at first. Subsequently, the topology and material advancements proposed to improve operational performance of the FMMG are comprehensively summarised so as to clarify its current development status. Finally, potential applications of the FMMG due to its inherent advantages are compared against the existent challenges. The review aims to provide referable guidelines for researchers working at the field of high‐performance MGs.

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“…The conventional approach involves using mechanical gearboxes to enhance torque output from electric motors, obviating the need for larger motors and achieving high torque density [2][3][4]. The literature reflects a burgeoning interest in various aspects of magnetic gear technology [4,[5][6][7][8][9][10]. Research endeavors span a spectrum of objectives, encompassing the reduction of magnetic gear costs, enhancement of torque density and efficiency, and exploration of diverse application domains including wind energy and automotive systems.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis of SMC Core Magnetic Gear for Vehicle Powertrain Systems

YILMAZ,

DİNDAR,

AYAZ

et al. 2023

Balkan Journal of Electrical and Computer Engineering

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The utilization of gears as intermediary components for power transmission in electric drive systems addresses the insufficiency of electric machines in handling torque loads effectively. Gears, commonly employed in the industry, can be either mechanical or magnetic, allowing for the balanced transfer of torque and speed at specified ratios. The mechanical and electrical actuation of in-vehicle accessories persists both in traditional and next-generation vehicles. Particularly concerning safety and the sustainability of spare part production and supply, various electrical accessories continue to operate at the 12 V level in modern vehicles. In this context, the use of the Lundell alternator (claw pole) also continues in next-generation vehicles. While the mechanical accessories are driven by a belt-pulley system connected to an internal combustion engine in conventional vehicles, in next-generation vehicles, both belt-pulley systems and x-drive by wire are present. The low efficiency and operational costs of belt-pulley power transmission systems necessitate the adoption of more efficient transmission systems. This study focuses on the development of a soft magnetic composite (SMC) core magnetic gear power transmission system that can serve as an alternative to belt-pulley systems in both traditional and next-generation vehicles. In the proposed system, mechanical power transfer to the Lundell alternator is realized through the intended magnetic gear. The gear ratio is determined to ensure a speed of 1800 rpm at the input of the Lundell alternator while the drive system operates at 6000 rpm. To achieve low volume and high efficiency for the proposed magnetic gear, the SMC material is considered, and a comprehensive analysis using the Ansys Maxwell finite element software is conducted. As a result of the analyses, in the magnetic gear designed with a transmission ratio of 3:1, when a torque of 11.7547 Nm is applied to the input shaft, a torque transmission of 35.9806 Nm has been achieved with an efficiency of 84.73% through the output shaft.

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Designing a Magnetic Gear for an Electric Aircraft Drivetrain

Cited by 14 publications

References 13 publications

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

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

A review on the field‐modulated magnetic gears: Development status, potential applications, and existent challenges

Finite Element Analysis of SMC Core Magnetic Gear for Vehicle Powertrain Systems

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