An Alternative Approach for Calculation of Braking Force of an Eddy-Current Brake

Srivastava, R. K.; Kumar, Shalendra

doi:10.1109/tmag.2008.2006993

Cited by 32 publications

(15 citation statements)

References 14 publications

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“…The modeling of the magnetic field and induction in complex geometries is difficult because it involves several nonlinear phenomena (Balakrishnan et al, 1997;Heald, 1988;Srivastava and Kumar, 2009). Nevertheless, several simplifying assumptions can be made to find a closed-form expression that estimates the viscosity of the clutch.…”

Section: Design Criteria Approximationsmentioning

confidence: 99%

Haptic interface transparency achieved through viscous coupling

Mohand-Ousaid

Millet

Régnier

et al. 2011

The International Journal of Robotics Research

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Electromagnetic drives are subjected to an inherent inertia-torque tradeoff that fundamentally limits transparency: the higher the torque, the higher the inertia. We describe a dual-stage design that is not subjected to this tradeoff and that is able to approach perfect transparency for human users. It comprises a large, proximal motor and a small, distal motor to reproduce the transients. The two stages are coupled by a viscous clutch based on eddy-currents that, without contact, accurately transforms slip velocity into torque. Such a system can, in general, be controlled to achieve a variety of objectives. Here, we show that an advanced, discrete-time, rst polynomial poleplacement controller can achieve near-perfect transparency. Experimental validation evaluated the human ability to detect small haptic details when using this drive and compared it to when using a conventional, single-motor interface.

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Section: Design Criteria Approximationsmentioning

confidence: 99%

Haptic interface transparency achieved through viscous coupling

Mohand-Ousaid

Millet

Régnier

et al. 2011

The International Journal of Robotics Research

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“…E DDY CURRENT brakes (ECBs) operate based on the induced eddy currents (EC) due to the motion of the conductive parts in the developed magnetic field [1], which can be produced by either permanent magnets (PMs) [2] or electricalexcited windings [3]. Even though the former eliminates the electrical supply system and somewhat simplifies the structure [4], it has some major drawbacks.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Electromagnetic Brakes: Design and Performance Evaluation

Yazdanpanah

Mirsalim

2015

IEEE Trans. Energy Convers.

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Eddy current brakes having advantages such as contactless operation offer an alternative to conventional frictionbased brakes. The flux source in an eddy current brake can be produced by permanent magnets or electrically excited windings. The former eliminates the need for an external supply, whereas the latter provides good control capability for the device. Herein, in order to take the advantages of both mentioned types, a hybrid electromagnetic brake is introduced, and the corresponding design guidelines for the brake part, the complementary part, i.e., the power generating unit, and the interface circuit are presented. Also, design considerations, as well as performance indices associated with the proposed configuration, are discussed. Moreover, the finite-element method is employed in the analyses and verifications of the design. Finally, a prototype has been manufactured whose results validate the simulation investigations and the design outcomes.Index Terms-Axial-flux, design, eddy current (EC), hybrid brake, optimization, permanent magnet synchronous generator (PMSG).

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“…However, Simeu's model can only express how ECB retards the rotator in low-speed region, but it cannot fully describe the ECB's property in highspeed region for it ignored the eddy current demagnetization. Recently, with the development of computational science, many have tried to model ECB with FEM [10][11][12], although the FEA results could be a reference for engineering design, it is still reasonable to develop current ECB's theoretical model for detecting the influences on ECB's braking torque stability [6][7][8]. Hence, this paper presents a modelling method based on magnetic circle theory, which is easy to find the relations of the internal parameters to the braking torque stabilization.…”

Section: Introductionmentioning

confidence: 99%

Parameter Analysis on Torque Stabilization for the Eddy Current Brake: A Developed Model, Simulation, and Sensitive Analysis

Zhou

Guo

Tan

et al. 2015

Mathematical Problems in Engineering

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Eddy current brake (ECB) is an attractive contactless brake whereas it suffers from braking torque attenuation when the rotating speed increases. To stabilize the ECB's torque generation property, this paper introduces the concept of anti-magneto-motive force to develop the ECB model on the fundamental of magnetic circles. In the developed model, the eddy current demagnetization and the influence of temperature which make the braking torque attenuation are clearly presented. Using the developed model of ECB, the external and internal characteristics of the ECB are simulated through programming by MATLAB. To find the sensibility of the influences on ECB's torque generation stability, the stability indexes are defined and followed by a sensibility analysis on the internal parameters of an ECB. Finally, this paper indicates that (i) the stability of ECB's torque generating property could be enhanced by obtaining the optimal combination of "demagnetization speed point and the nominal maximum braking torque. " (ii) The most remarkable influencing factor on the shifting the demagnetization speed point of ECB was the thickness of the air-gap. (iii) The radius of pole shoe's cross section area and the distance from the pole shoe center to the rotation center are both the most significant influences on the nominal maximum braking torque.

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An Alternative Approach for Calculation of Braking Force of an Eddy-Current Brake

Cited by 32 publications

References 14 publications

Haptic interface transparency achieved through viscous coupling

Haptic interface transparency achieved through viscous coupling

Hybrid Electromagnetic Brakes: Design and Performance Evaluation

Parameter Analysis on Torque Stabilization for the Eddy Current Brake: A Developed Model, Simulation, and Sensitive Analysis

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