The Mechanism How Coaxial Magnetic Gear Transmits Magnetic Torques Between Its Two Rotors: Detailed Analysis of Torque Distribution on Modulating Ring

Jian, Linni; Deng, Zhengxing; Shi, Yujun; Wei, Jeng−Hua; Chan, C. C.

doi:10.1109/tmech.2019.2893183

Cited by 33 publications

(14 citation statements)

References 35 publications

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“…With the focus placed on axial forces, other local effects are omitted, which affects output torque characteristics, torque pulsations, and, in some cases, radial unbalanced magnetic forces (RUMF). While the authors came across papers about these issues in RFMGs [21,25,26] during the literature review, they did not find any papers about these issues in AFMGs.…”

Section: Force Analysis In Afmgs 41 Locked Low-speed Rotor and Modumentioning

confidence: 99%

Forces in Axial Flux Magnetic Gears with Integer and Fractional Gear Ratios

et al. 2021

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This paper presents a comparison of two variants of an axial flux magnetic gear (AFMG), namely, with integer and fractional gear ratios. Based on calculations derived with the use of three-dimensional numerical models, the torque characteristics of the analyzed AFMGs are computed and verified on a physical model. The greatest emphasis is put on the detailed decomposition and analysis of local forces in modulator pole pieces (also used in the structural analysis) within the no-load and maximal load conditions. The authors also describe the unbalanced magnetic forces (UMF) in the axial and radial directions resulting from the construction of the considered AFMGs variants, and their possible effects in the context of the use of additive manufacturing (AM) in prototypes. The paper also proposes an effective method for limiting the axial strain by using the asymmetry of the air gaps, which slightly reduces the torque transmitted by AFMGs. Finally, a static strength analysis was presented that allows us to assess the effects of local forces in the form of modulator disc deformation for selected cases of air gap asymmetry.

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Section: Force Analysis In Afmgs 41 Locked Low-speed Rotor and Modumentioning

confidence: 99%

Forces in Axial Flux Magnetic Gears with Integer and Fractional Gear Ratios

et al. 2021

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“…The motivation lies with the impact of the magnetic gear technology with the capability to enter the industries sector. For example, a magnetic gear system with bigger torque capacity with reduced ripples through the flux modulator structure with linking bridges between them, which is known as modulating ring, is presented in References [3,4]. The triple permanent magnetic gear structure is introduced by Shan Peng [5], with improved magnetic energy density.…”

Section: Introductionmentioning

confidence: 99%

Simplified Design of Magnetic Gear by Considering the Maximum Transmission Torque Line

et al. 2020

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Magnetic gears (MGs) technology is studied widely among research institutions, with several improvements being documented. This development attracts a high amount of attention due to the demand in the development of magnetic gears towards higher performance than the conventional mechanical counterpart. In general, the design is complicated and there is a lack in detailed references for designing an MG for specific transmission torque as required by its application. Trial-and-error approaches have been the norm in achieving the desired torque by referring the existing MGs for the desired value of torque. This paper presents a new simplified approach towards designing an MG for the required torque and size by referring through a Maximum Transmission Torque Line (MTTL) reference. Finite element method (FEM) is used in analyzing randomly designed magnetic gears with various parameters towards the desired values of the MTTL. The proposed approach of MTTL is a new approach to estimate the total volume of permanent magnets (PMs) required for the MG to achieve the desired transmission torque. The reference line is used to generate equation relating the specific parameters of MG to develop the simplified design of MG based on the estimated total volume of PMs. This simplified way details to 8.5% of error in targeting the desired transmission torque, a means and way for the first stage of the MG design approach to reduce the conventional approaches.

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“…Hence, the flux-modulation machine can naturally reduce the rotating speed of the rotor by increasing the pole-pair number of PMs on the rotor, serving as a perfect candidate to be used in tidal power generation [8]. What's more, by eliminating the mechanical gearbox, the system efficiency can be improved and the vibration and noise can be reduced [9,10]. Indeed, flux-modulation machines have become a hot spot in recent years, and various topologies have been proposed.…”

Section: Introductionmentioning

confidence: 99%

A Dual-Modulator Magnetic-Geared Machine for Tidal-Power Generation

et al. 2020

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In this paper, a new dual-modulator magnetic-geared machine (DM-MGM) is proposed for tidal power generation with the virtue of high torque output at low speed. Firstly, the requirement of DM-MGM for tidal power generation is derived. Then, the flux modulation principle and flux-enhancing effect of the extra modulator of the proposed DM-MGM are elaborated. After that, a finite element analysis and genetic algorithm combined (FEA-GA) method is utilized to solve a multi-objective optimization problem for the DM-MGM design. The electromagnetic performances of the optimized DM-MGM with different pole-pair combinations are quantitatively compared via FEA. The results show the effectiveness of proposed machine, which is suitable to be applied in tidal power generation scenario.

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The Mechanism How Coaxial Magnetic Gear Transmits Magnetic Torques Between Its Two Rotors: Detailed Analysis of Torque Distribution on Modulating Ring

Cited by 33 publications

References 35 publications

Forces in Axial Flux Magnetic Gears with Integer and Fractional Gear Ratios

Forces in Axial Flux Magnetic Gears with Integer and Fractional Gear Ratios

Simplified Design of Magnetic Gear by Considering the Maximum Transmission Torque Line

A Dual-Modulator Magnetic-Geared Machine for Tidal-Power Generation

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