Initial design of two-stage magnetic gear for high power density according to gear ratio

Park, Eui-Jong; Jung, Sang-Yong; Kim, Yong-Jae

doi:10.3233/jae-190097

Cited by 2 publications

(2 citation statements)

References 6 publications

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“…In this paper, the theoretical calculation and analysis of the magnetic gear are carried out, and then the finite element analysis is used to verify it. According to a large number of references, the finite element analysis method is credible 26,30 …”

Section: Discussionmentioning

confidence: 99%

“…According to a large number of references, the finite element analysis method is credible. 26,30 The finite element method was used to simulate US-CMG, HM-CMG, and SM-CMG, and the electromagnetic performances of the three CMGs are also theoretically analyzed. The results show that the torque density of US-CMG is the highest and the torque ripple is the lowest among the three CMGs.…”

Section: Discussionmentioning

confidence: 99%

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Electromagnetic performance analysis of the umbrella shaping inner rotor coaxial magnetic gear with dual modulation rings

Wang

Zhang

Qian

et al. 2022

Energy Science & Engineering

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The coaxial magnetic gear is a new type of noncontact transmission mechanism, which avoids the inherent defects of the mechanical gearbox due to gear meshing transmission. To study a coaxial magnetic gear (CMG) with high torque density and low torque ripple to replace the mechanical gear in the semidirect drive wind turbine, a novel umbrella shaping inner rotor CMG (US-CMG) with an auxiliary modulation ring is proposed in this paper.The novel structure adopts a CMG with a dual modulated ring to increase the electromagnetic torque. In addition, the magnetic block of the poled inner rotor is divided into three pieces magnetized by Halbach arrays, and the middle piece is umbrella-shaped to reduce torque ripple. Based on the topology of the US-CMG and the principle of the magnetic field modulation, the operation mechanism of the US-CMG is analyzed. A contrastive analysis among the US-CMG, Halbach magnetized dual-modulator CMG (HM-CMG), and surface-mounted CMG (SM-CMG) is established to identify the performance of the US-CMG. Compared with the SM-CMG, the results show that the electromagnetic torque of the US-CMG has increased by 65.46%, and the torque ripple of the US-CMG is 57.6% of that of the SM-CMG.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Electromagnetic performance analysis of the umbrella shaping inner rotor coaxial magnetic gear with dual modulation rings

Wang

Zhang

Qian

et al. 2022

Energy Science & Engineering

View full text Add to dashboard Cite

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Gear efficiency estimation method through finite element and curve fitting

Halim

Sulaiman

Othman

2021

JAE

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The inclusion of high energy density permanent magnet (PM) in MG contributes to the high eddy current loss in magnetic gear and reduces its efficiency. There was limited research done that focused on gear efficiency behavior over a broader range of speed and in different gear ratios. In this paper, the function of gear efficiency concerning gear ratio and rotational speed is proposed. Torque and eddy current loss data were obtained through transient magnetic analysis using finite element software at several rotational ranges and gear ratios. The analytical approach through mathematical substitution was discussed to confirm the finding in the simulation. The result showed that the gear efficiency decreases as the speed increases. Nonetheless, the gear efficiency revealed improvement in efficiency as the gear ratio increases. Finally, gear efficiency behavior was modeled using the curve fitting method. Subsequently, based on the correlation study, an equation was proposed, yielding a 1% error compared to the new simulated data. With this proposed method and equation, the analysis and estimation of gear efficiency behavior over wider speed and gear ratios are simplified, thus reducing the need to perform simulation over different speeds and gear ratios.

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Initial design of two-stage magnetic gear for high power density according to gear ratio

Cited by 2 publications

References 6 publications

Electromagnetic performance analysis of the umbrella shaping inner rotor coaxial magnetic gear with dual modulation rings

Electromagnetic performance analysis of the umbrella shaping inner rotor coaxial magnetic gear with dual modulation rings

Gear efficiency estimation method through finite element and curve fitting

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