Ideal Radial Permanent Magnet Coupling Torque Density Analysis

Li, Kang; Bird, Jonathan Z.; Acharya, Vedanadam M.

doi:10.1109/tmag.2017.2668139

Cited by 13 publications

(4 citation statements)

References 13 publications

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“…The proposed magnetic spring joint uses a permanent magnet coupling (PMC) structure (e.g. [29], [30]) in Fig. 2A.…”

Section: A Design Of the Magnetic Spring Jointmentioning

confidence: 99%

A Novel Passive Shoulder Exoskeleton Using Link Chains and Magnetic Spring Joints

Lee,

Yoon,

Lim

et al. 2024

IEEE Trans. Neural Syst. Rehabil. Eng.

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Work-related musculoskeletal disorders represent a major occupational disability issue, and 53.4% of these disorders occur in the back or shoulders. Various types of passive shoulder exoskeletons have been introduced to support the weight of the upper arm and work tools during overhead work, thereby preventing injuries and improving the work environment. The general passive shoulder exoskeleton is constructed with rigid links and joints to implement shoulder rotation, but there exists a challenge to align with the flexible joint movements of the human shoulder. Also, a force-generating part using mechanical springs require additional mechanical components to generate torque similar to the shoulder joint, resulting in increased overall volume and inertia to the upper arm. In this study, we propose a new type of passive shoulder exoskeleton that uses magnetic spring joint and link chain. The redundant degrees of freedom in the link chains enables to follow the shoulder joint movement in the horizontal direction, and the magnetic spring joint generates torque without additional parts in a compact form. Conventional exoskeletons experience a loss in the assisting torque when the center of shoulder rotation changed during arm elevation. Our exoskeleton minimizes the torque loss by customizing the installation height and initial angle of the magnetic spring joint. The performances of the proposed exoskeleton were verified by an electromyographic evaluation of shoulder-related muscles in overhead work and box lifting task.

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“…The proposed magnetic spring joint uses a permanent magnet coupling (PMC) structure (e.g. [29], [30]) in Fig. 2A.…”

Section: A Design Of the Magnetic Spring Jointmentioning

confidence: 99%

A Novel Passive Shoulder Exoskeleton Using Link Chains and Magnetic Spring Joints

Lee,

Yoon,

Lim

et al. 2024

IEEE Trans. Neural Syst. Rehabil. Eng.

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“…In [78], it is proposed a new analytical formulation using a subdomain method and the torque density optimised by Genetic Algorithms (GA). Recently, in [98,99], it is proposed what is called as "ideal" AMC and RMC, with rotors made from arc-shaped magnets in Halbach arrays, and their torque density analyses are based on a new analytical formulation, including the curvature effects that were neglected in [78]. However, here, it is considered that they cannot be "ideals" if the results in [92] are not applied.…”

Section: Advances In Reconfigurable Magnetic Couplingsmentioning

confidence: 99%

Advances in Reconfigurable Vectorial Thrusters for Adaptive Underwater Robots

Gasparoto

Chocron

Benbouzid

et al. 2021

JMSE

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Manoeuvrability is one of the essential keys in the development of improved autonomous underwater vehicles for challenging missions. In the last years, more researches were dedicated to the development of new hulls shapes and thrusters to assure more manoeuvrability. The present review explores various enabling technologies used to implement the vectorial thrusters (VT), based on water-jet or propellers. The proposals are analysed in terms of added degrees of freedom, mechanisms, number of necessary actuators, water-tightness, electromagnetomechanical complexity, feasibility, etc. The usage of magnetic coupling thrusters (conventional or reconfigurable) is analysed in details since they can assure the development of competitive full waterproof reconfigurable thrusters, which is a frictionless, flexible, safe, and low-maintenance solution. The current limitations (as for instance the use of non conductive hull) are discussed and ideas are proposed for the improvement of this new generation of underwater thrusters, as extending the magnetic coupling usage to obtain a fully contactless vector thrust transmission.

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“…Synchronous magnetic couplings in which both rotors rotate at the same speed [2] and asynchronous magnetic couplings in which the torque transmission is due to induced currents and the transmittable torque depends on the slip between the two rotors [3]. Both types of magnetic couplings can be found in radial-flux or axial-flux form [4], [5].…”

Section: Introductionmentioning

confidence: 99%

Non-Linear 3-D Semi-Analytical Model for an Axial-Flux Reluctance Magnetic Coupling

Dorget

Lubin

2022

IEEE Trans. Energy Convers.

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This article presents a 3-D semi-analytical model of an axial-flux reluctance coupling. Thanks to the separation of variable s method, Fourier series analysis and the convolution the orem (i.e. Cauchy's product), the salient-pole region is modelled by a spatially variable magnetic permeability. Additionally, an iterative algorithm is implemented to account for the magnetic saturation of the iron teeth. The results of the proposed model are compared with a previously published 2-D se mi-analytical model, 3-D finite-element method and e xperimental results. The proposed method appears to be an appropriate tool for the design process of reluctance couplings in cases where the salient poles are saturated.

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Ideal Radial Permanent Magnet Coupling Torque Density Analysis

Cited by 13 publications

References 13 publications

A Novel Passive Shoulder Exoskeleton Using Link Chains and Magnetic Spring Joints

A Novel Passive Shoulder Exoskeleton Using Link Chains and Magnetic Spring Joints

Advances in Reconfigurable Vectorial Thrusters for Adaptive Underwater Robots

Non-Linear 3-D Semi-Analytical Model for an Axial-Flux Reluctance Magnetic Coupling

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