Torque Density Design Optimization of Rotating Pole Piece Concentric Magnetic Gear

Halim, Mohd Firdaus Mohd Ab; Sulaiman, Erwan; Aziz, Roziah; Othman, Radzali; Rahman, Azrul Azwan Abdul

doi:10.1007/s13369-021-05812-3

Cited by 7 publications

(4 citation statements)

References 34 publications

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“…To demonstrate the cogging factor, fc in equation ( 1), four sets of pole pair combinations are determined for CMG and RPMG using equations ( 5) and (6). In this study, the middle range of EVs final drive ratio is considered, which is between 4 to 8, whilst in pra previous study, only one combination was assessed for each gear ratio [13]. Table 1 to 4 show the pole pair combinations, set A, B, C, and D. The outer rotor pole number is denoted as either ph or np which represent the CMG or RPMG topology.…”

Section: Identification Of the Best Pole Pair Combination Through Lcm...mentioning

confidence: 99%

Birkaç kutup çifti kombinasyonunda CMG ve RPMG'nin dişli faktörünün araştırılması

Halim

Sulaiman

Rahman

2023

ECJSE

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The design on magnetic gear (MG) involves determining the gear ratio specific to its application. The gear ratio can be determined by the pole number of the inner rotor, outer rotor and the pole piece. In this research, the cogging torque of several pole pair combinations in concentric magnetic gear (CMG) and rotating pole piece magnetic gear (RPMG) were investigated. The gear ratio equations were initially derived for both CMG and RPMG. Based on these equations, four sets of pole pair combinations were determined. The cogging factor was calculated in each combination. To determine the cogging factor significance towards the cogging torque, the magnetic gears were simulated in 2D finite element software. The result revealed that the lower pole pair combination generates lower cogging torque than the higher pole pair combination. The simulation result also shows that the rate of increase in cogging factor did not correlate directly to the cogging torque in the simulation. It is concluded that the cogging factor is not a suitable tool to access the cogging torque level in CMG and RPMG.

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Section: Identification Of the Best Pole Pair Combination Through Lcm...mentioning

confidence: 99%

Birkaç kutup çifti kombinasyonunda CMG ve RPMG'nin dişli faktörünün araştırılması

Halim

Sulaiman

Rahman

2023

ECJSE

Self Cite

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“…This would yield a higher torque transmission. This topology is referred to as the rotating-pole-piece magnetic gear (RPMG) [17], [18]. Since the outer components of the RPMG is stationary, a second flux source can be designed on it to reduce the use of PM material in RPMG.…”

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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“…In addition to exploring novel technologies, design optimization is another effective way to improve the performance of MGs, such as selecting the best pole pair combination, maximizing the torque density and efficiency, and minimizing the torque ripple and cost [19,20]. Since electromagnetic devices such as electric machines and MGs have a multi-physics performance, the abovementioned single-objective optimizations are not enough to improve the overall operation of such devices.…”

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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Torque Density Design Optimization of Rotating Pole Piece Concentric Magnetic Gear

Cited by 7 publications

References 34 publications

Birkaç kutup çifti kombinasyonunda CMG ve RPMG'nin dişli faktörünün araştırılması

Birkaç kutup çifti kombinasyonunda CMG ve RPMG'nin dişli faktörünün araştırılması

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

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

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