Performance improvement of magnetic gear and efficiency comparison with conventional mechanical gear

Nakamura, Kenji; Fukuoka, Michinari; Ichinokura, O.

doi:10.1063/1.4863809

Cited by 24 publications

(12 citation statements)

References 5 publications

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“…These properties make them a suitable material for making microcomponents, e.g., fast mixing of magnetic fluidics can be achieved by magnetic micromixer; magnetic gears have low vibration and wear because they can transmit torque without any mechanical contact [21,22]. This paper presents the fabrication of iron-nickel alloy microcomponents (microchannel, microwell, micromixer, and microgear) from an ethanol-based slurry by centrifugeassisted micromolding.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of iron-nickel alloy microcomponents by centrifuge-assisted micromolding

Zhou

Guo

2015

Int J Adv Manuf Technol

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Iron-nickel alloys exhibit lots of attractive properties, such as magnetic and conductivity properties, as well as excellent corrosion resistance. These properties make them suitable for making microcomponents. This paper presents the fabrication of iron-nickel alloy microcomponents (microchannel, microwell, micromixer, and microgear) from an ethanol-based composite slurry by centrifuge-assisted micromolding. Polydimethylsiloxane (PDMS) molds were replicated from microstructured silicon masters. A stable ethanol-based iron-nickel composite slurry with a high solid content of 85 wt% was prepared and filled into the PDMS molds by the aid of centrifugation. After drying, green microcomponents were demolded and followed by sintering in hydrogen atmosphere. Sintering profile was established by TGA. The green and sintered microcomponents had good shape retention and were free of cracks. The highest density of the microcomponents (97.3 RD%) was achieved at 1070°C; the corresponding microhardness and Young's modulus were 167.8 HV and 175.4 GPa, respectively. The linear shrinkage increased with sintering temperature and the maximum value was about 12.5 %.

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Section: Introductionmentioning

confidence: 99%

Fabrication of iron-nickel alloy microcomponents by centrifuge-assisted micromolding

Zhou

Guo

2015

Int J Adv Manuf Technol

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“…5 Because the space harmonics in the PM, slot and air gap have different pitch, correlation is applied to the field solutions on the boundary between these regions. 6 Outer radius of inner PMs 47 mm r 3 Inner radius of steel pole 47.8 mm r 4 Outer radius of steel pole 55.8 mm r 5 Inner radius of outer PMs 56.6 mm r 6 Outer …”

Section: A Analytical Modelmentioning

confidence: 99%

“…Therefore, many researchers have performed torque analyses using finite element (FE) and other analytical methods. [2][3][4] Compared with other analytical methods, the merits of FE methods are their high accuracy and reliability. They are also applicable to any complicated geometrical structure.…”

Section: Introductionmentioning

confidence: 99%

Parametric analysis and optimized torque characteristics of a coaxial magnetic gear based on the subdomain analytical model

et al. 2017

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This paper presents the torque calculation and parametric analysis of a coaxial magnetic gear (CMG). We obtained analytical magnetic field solutions produced by permanent magnets based on a magnetic vector potential. Then, the analytical solutions for magnetic torque were obtained. All analytical results were extensively validated with nonlinear two-dimensional finite element analysis. Finally, using the derived analytical magnetic torque solutions, we carried out parametric analysis to determine the influence of the design parameters on the CMG’s behavior.

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“…A detailed comparison between the planetary mechanical and coaxial magnetic gears has been provided in [10], showing that coaxial magnetic gears could have comparable or better performance than their mechanical counterparts while avoiding many mechanical drawbacks. Some other comparisons in [7] and [11] indicate that the coaxial magnetic gears exhibit a remarkably improved efficiency with a comparable or smaller volume than some classical commercial mechanical gearboxes.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Design Optimization of a Coaxial Surface-Mounted Permanent-Magnet Magnetic Gear

et al. 2014

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This paper presents the analysis and design optimization of a coaxial surface-mounted permanent-magnet magnetic gear. The magnetic field distribution in the coaxial magnetic gear is calculated analytically in the polar coordinate system and then validated by the finite element method (FEM). The analytical field solution allows the prediction of the magnetic torque, which is formulated as a function of design parameters. The impacts of key design parameters on the torque capability are then studied and some significant observations are summarized. Furthermore, the particle swarm optimization (PSO) algorithm is employed to optimize the studied magnetic gear. Given that the torque capability and material cost conflict with each other, both of them are set as the optimization objectives in this paper. Different weight factors may be chosen for the two objectives so that more attention can be placed on one or another. The results shows that the highest torque density of 157 kNm/m 3 is achieved with the consideration focusing on the torque capability only, then the highest torque per permanent magnet (PM) consumption could be improved to 145 Nm/kg by taking the material cost into account. By synthesizing the torque capability and material cost, a 124 kNm/m 3 of torque density and a 128 Nm/kg of torque per PM consumption could be achieved simultaneously by the optimal design.

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Performance improvement of magnetic gear and efficiency comparison with conventional mechanical gear

Cited by 24 publications

References 5 publications

Fabrication of iron-nickel alloy microcomponents by centrifuge-assisted micromolding

Fabrication of iron-nickel alloy microcomponents by centrifuge-assisted micromolding

Parametric analysis and optimized torque characteristics of a coaxial magnetic gear based on the subdomain analytical model

Analysis and Design Optimization of a Coaxial Surface-Mounted Permanent-Magnet Magnetic Gear

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