Optimisation procedure for designing a magnetic gear

McGilton, Ben; Crozier, Richard; Mueller, Markus

doi:10.1049/joe.2017.0448

Cited by 9 publications

(4 citation statements)

References 9 publications

(9 reference statements)

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“…Structure of surface-mount CMG [10] Since the demand for high efficiency and compact gears has increased, hence also the need to accommodate devices that incorporate miniscule and energy efficiency in their design. The presence of highenergy-density PM in CMG contributes to a large increase in eddy current loss in magnetic gears, particularly during high-speed operations, and lowering gear efficiency [13]- [16]. A reduction in gear efficiency weakens torque capability, hence rendering for lower torque density.…”

Section: Introductionmentioning

confidence: 99%

Hybrid-excited magnetic gear topology for improved gear efficiency at increasing rotor speed

Halim,

Rahman,

Yahaya

et al. 2024

IJPEDS

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Concentric magnetic gear (CMG) and rotating pole piece magnetic gear (RPMG) are two topologies that produce high torque density in magnetic gear (MG) for electrical machine. However, due to the eddy current loss, both suffer high losses when operated in high speed condition. Thus, to overcome this matter, a second flux source is proposed to the RPMG stator. This approach will then transform it into hybrid excited magnetic gear (HMG) topology to achieve higher gear efficiency. Three tooth slot designs were considered, and the outcome of these designs are summarized and ranked. The proposed structures are assessed using JMAG designer 2D finite element software in high speed condition. It is found that partially closed slot structure achieved the highest gear efficiency of 95.34% and average outer rotor torque of 115.64 N.m.

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Section: Introductionmentioning

confidence: 99%

Hybrid-excited magnetic gear topology for improved gear efficiency at increasing rotor speed

Halim,

Rahman,

Yahaya

et al. 2024

IJPEDS

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“…In [25], the PMs' arrangement of a CMG was optimised using the Tabu search algorithm to maximise the torque density. In [26], a genetic algorithm (GA) was used to maximise the torque density of a MG while keeping the amount of the used active materials constant. A CMG with and without back‐iron on its outer rotor has been optimised to increase the torque density and reduce losses [27].…”

Section: Introductionmentioning

confidence: 99%

Optimal design of an axial magnetic gear by using particle swarm optimisation method

Sepaseh

Rostami

Feyzi

et al. 2022

IET Electric Power Appl

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This paper introduces a multi‐objective optimal design for an axial magnetic gear (AMG). In this study, the condition for high torque density and low cogging torque was deduced while the cost of the active materials was also reduced. The number and direction of permanent magnets and their arrangement were unchanged in the optimisation process, and the considered AMG's main dimensions were optimised using the particle swarm optimisation method. The optimised AMG was compared with the latest and similar structures with a relatively high torque density. To extract the produced torque density and cogging torque, three‐dimensional (3D) finite element analyses were conducted. The results showed that while torque density increased and cogging torque decreased, the total volume and magnetic materials used decreased significantly.

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“…In 2001, K. Atallah designed a high torque density MG called as the coaxial magnetic gear (CMG), where it applies the principle of magnetic flux modulation between PM and pole piece [18,19]. Based on the flux modulation technique, many CMG topologies were published [20][21][22][23][24][25][26][27][28][29][30]. CMG introduced by K. Atallah is reillustrated in Figure 2 in JMAG Application Note [31].…”

Section: Introductionmentioning

confidence: 99%

Flux modulated rotating pole piece magnetic gear

Halim

Sulaiman

Othman

2020

IJPEDS

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In this paper, the CMG is re-condition so that the pole piece act as the outer rotor instead of surface mount PM. This magnetic coupling of the CMG is similar to the conventional CMG which uses harmonic to transfer the torque and speed from the inner rotor to the outer rotor. The working principle of the proposed CMG is derived analytically and simulated using finite element software. For this recondition, the PM at the outer section become stationary hence, retaining sleeve can be removing. The proposed MG produced 18% higher average torque than the conventional MG with drawback in torque ripple. The proposed CMG also produce higher gear ratio than the same pole pair of conventional CMG.

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Optimisation procedure for designing a magnetic gear

Cited by 9 publications

References 9 publications

Hybrid-excited magnetic gear topology for improved gear efficiency at increasing rotor speed

Hybrid-excited magnetic gear topology for improved gear efficiency at increasing rotor speed

Optimal design of an axial magnetic gear by using particle swarm optimisation method

Flux modulated rotating pole piece magnetic gear

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