The radial magnetic coupling studies of perpendicular magnetic gears

Yao, Y. D.; Huang, Der‐Ray; Hsieh, C.C.; Chiang, Donyau; Wang, S.J.; Ying, Tai-Fa

doi:10.1109/20.539490

Cited by 33 publications

(20 citation statements)

References 6 publications

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“…Figure 11 shows that for small pg/r 2 the torque rises whereas for large pg/r 2 the torque decreases. This was found experimentally and numerically in [43][44][45][46] -here we have proven it analytically.…”

Section: Torques Between Multi-polar Discssupporting

confidence: 49%

Closed Analytical Formulae for Multi-Pole Magnetic Rings

Ausserlechner¹

2012

PIER B

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Abstract-Multi-pole permanent magnetic encoders are used for wheel speed sensing in automotive systems. This paper discusses rings and discs magnetized along axial direction. The vector field is calculated analytically in 3D as sums over all poles. For the case of discs with vanishing inner and infinite outer diameter the summation is done in closed form with a new summation formula. The results are discussed and several plots of field patterns are given in normalized form: At very small air-gap the field shows an overshoot. At moderate and large air-gaps it is a sine-function with exponentially decaying amplitude. The amplitude versus air gap, reading radius, thickness of the magnetic layer, and number of poles is studied and excellent agreement with measurements is found. The effect of a steel-back on the field is explained. It is also shown how to maximize the torque transmitted in axially magnetized couplings.

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Section: Torques Between Multi-polar Discssupporting

confidence: 49%

Closed Analytical Formulae for Multi-Pole Magnetic Rings

Ausserlechner¹

2012

PIER B

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“…Moreover, in [18,19], the corresponding two-dimensional analytical calculation approach has been developed and exhibits a good agreement with the FEA results. In addition, Yao et al also studied the magnetic coupling characteristics of a perpendicular-axis MG shown in Figure 5 [20]. Although the configuration of parallel-axis or perpendicular-axis MGs is very simple, their torque density is so low that they cannot be widely used.…”

Section: Converted Magnetic Gearsmentioning

confidence: 99%

Comparison of Magnetic-Geared Permanent-Magnet Machines

Li¹,

Chau²,

Cheng³

et al. 2013

PIER

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Abstract-With the advent of magnetic gears, researchers have developed a new breed of permanent-magnet machines. These magnetic-geared permanent-magnet machines artfully incorporate the concept of magnetic gearing into the permanent-magnet machines, leading to achieve low-speed high-torque direct-drive operation. In this paper, a quantitative comparison of three viable magnetic-geared permanent-magnet machines is firstly performed, hence revealing their key features, merits, demerits and applications.Initially, the development of the magnetic gears, including the converted topologies and field-modulated topologies, is reviewed. Then, three viable magnetic-geared permanent-magnet machines are identified and discussed. Consequently, the corresponding performances are analyzed and quantitatively compared. The results and discussions form an important foundation for research in low-speed high-torque direct-drive systems.

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“…The first analytical formulations for the forces between cuboidal magnets was given by Akoun and Yonnet [27]. Then, these expressions were completed for various shapes and this allowed the design and optimization of couplings devoted to different applications [28][29][30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

“…Some analytical studies have been performed by several authors [27][28][29][30][31][32][33][34][35][36][37][38][39][40] for studying such magnetic couplings. However, these studies omitted the curvature effect of the tile permanent magnets.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Couplings With Cylindrical and Plane Air Gaps: Influence of the Magnet Polarization Direction.

Ravaud¹,

Lemarquand²

2009

PIER B

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Abstract-This paper presents a comparison of cylindrical and plane air gap magnetic couplings in which the tile permanent magnet polarizations can be either radial or tangential or axial.The expressions of the torque transmitted between the two rotors of each coupling are determined by using the colombian approach. All the calculations are performed without any simplifying assumptions. Consequently, the expressions obtained are accurate and enable a fast comparison between the structures presented in this paper.

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The radial magnetic coupling studies of perpendicular magnetic gears

Cited by 33 publications

References 6 publications

Closed Analytical Formulae for Multi-Pole Magnetic Rings

Closed Analytical Formulae for Multi-Pole Magnetic Rings

Comparison of Magnetic-Geared Permanent-Magnet Machines

Magnetic Couplings With Cylindrical and Plane Air Gaps: Influence of the Magnet Polarization Direction.

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