Comparison of transient performances for synchronous and eddy-current torque couplers

Lubin, Thierry; Fontchastagner, Julien; Mezani, Smaïl; Rezzoug, A.

doi:10.1109/icelmach.2016.7732602

Cited by 12 publications

(12 citation statements)

References 26 publications

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“…The reluctance R 1 corresponding to the magnetic flux leakage of the permanent magnet through the back iron can be obtained by the leakage permeance as (6). For the convenience of calculation, it is assumed that the direction of the magnetic flux leakage is perpendicular to the permanent magnet, and the depth of the magnetic flux leakage through the back iron is t s1 /2.…”

Section: ) Air Gap Magnetic Density Modelmentioning

confidence: 99%

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Modeling and Performance Analysis of an Axial-Radial Combined Permanent Magnet Eddy Current Coupler

Wang

Gao

et al. 2020

IEEE Access

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The structure and magnetic circuits of axial-radial combined permanent magnet eddy current couplers are more complicated than those of axial or radial permanent magnet eddy current couplers, the degree of coupling is deeper, which will affect the device performance. In this paper, a novel analytical model for an axial-radial combined permanent magnet eddy current coupler is proposed based on the equivalent magnetic circuit method. The distribution of the magnetic field, the relationship between the slip and torque, the influence of the structural parameters on the transmission performance, the 3-D correction and thermal compensation are studied. Combined with the concept of the micro-element method, the air gap magnetic density, eddy current density and torque are accurately calculated, which solves the problem that the existing model cannot analyse the axial-radial combined structure. To show the effectiveness of the proposed analytical model, the transmission performance of an axial-radial combined permanent magnet eddy current coupler prototype is investigated, and the analytical calculation results are compared with the results of the finite element method simulations and experimental tests. INDEX TERMS Axial-radial combined permanent magnet eddy current coupler, equivalent magnetic circuit model, modelling and performance analysis.

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Section: ) Air Gap Magnetic Density Modelmentioning

confidence: 99%

“…Permanent magnet eddy current couplers are purely mechanical structures, without an electric drive, so there is no harmonic and other pollution to the power grid [5]. Other significant advantages of permanent magnet eddy current couplers are isolated protection, no ripple torque, and excellent tolerance to shaft misalignment [6]- [8].…”

Section: Introductionmentioning

confidence: 99%

Modeling and Performance Analysis of an Axial-Radial Combined Permanent Magnet Eddy Current Coupler

Wang

Gao

et al. 2020

IEEE Access

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“…The goal of this paper is to develop a transient model for a reluctance magnetic coupling placed between two shafts. It is part of the author's works on the dynamic performance of magnetic couplings, following those recently performed on two-face permanent magnets and eddy-current couplings [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…However, this can be of great importance if a magnetic coupling is used to transmit the torque between two shafts for servomechanism. Previous published papers only concern classical magnetic couplings topologies or magnetic gear [12][13][14], [17][18][19][20][21]. To the best knowledge of the authors, no studies have been conducted to analyze the transient behavior of a reluctance magnetic coupling.…”

Section: Introductionmentioning

confidence: 99%

Simulation analysis and experimental evaluation of the transient behaviour of a reluctance magnetic coupling

Lubin

Colle

2020

IET Electric Power Applications

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The aim of this paper is to present the dynamic behavior of two co-axial rotating shafts connected by a reluctance magnetic coupling. The analysis is based on nonlinear differential equations of motion. The reluctance magnetic coupling is modeled by an equivalent torsional stiffness coefficient and an additional viscous damping coefficient to account for the effects of induced currents in the salient-pole during the transient. These coefficients are obtained from 3D finite element electromagnetic models. In order to evaluate the accuracy of the proposed model, several transient responses for the shaft line are considered. The simulation results are compared with those obtained from measurements.

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“…In transient-state, besides small oscillations, the coupling can also be considered synchronous. These small oscillations do not generate significant losses, which do not generate a damping effect [19]. The magnetic torque behavior is fully described using analytical and numerical models validated with real-world experiments on our prototype ( Figure 1).…”

mentioning

confidence: 97%

Torque Analysis of a Flat Reconfigurable Magnetic Coupling Thruster for Marine Renewable Energy Systems Maintenance AUVs

et al. 2018

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The concept of reconfigurable magnetic coupling thrusters (RMCT) applied to the vectorial thrust of autonomous underwater vehicles (AUV) has been recently developed and presented. This technology ensures greater robot watertightness with enhanced maneuvering capabilities, which are desired features in agile AUVs for marine renewable energy (MRE) system maintenance. It is possible since in RMCTs the driving torque is magnetically transmitted to the propeller, which has its orientation changed. This work is focused on the coupling and control torque calculation and further analysis of the latest prototype version (Flat-RMCT), in the static condition for the full thrust vector range. For this purpose, a numerical model is implemented and validated with experimental results. The numerical model is based on the finite volume integral method. The results indicate that the minimum magnetic reluctance propensity creates not only the expected magnetic spring effect but also an auto-driving torque due to the non-axial symmetry of coupling rotors, which exists only for reconfigurable couplings. Mathematical functions are proposed to model these effects and they are used to extend the understanding of the coupling. These models can be used to compose a full and accurate dynamic model for a better RMCT simulation, identification, and control.

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Comparison of transient performances for synchronous and eddy-current torque couplers

Cited by 12 publications

References 26 publications

Modeling and Performance Analysis of an Axial-Radial Combined Permanent Magnet Eddy Current Coupler

Modeling and Performance Analysis of an Axial-Radial Combined Permanent Magnet Eddy Current Coupler

Simulation analysis and experimental evaluation of the transient behaviour of a reluctance magnetic coupling

Torque Analysis of a Flat Reconfigurable Magnetic Coupling Thruster for Marine Renewable Energy Systems Maintenance AUVs

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