An Investigation of Face Type Magnetic Couplers

Waring, R. H.; Hall, James J.; Pullen, Keith; Etemad, M R

doi:10.1243/pime_proc_1996_210_045_02

Cited by 9 publications

(4 citation statements)

References 3 publications

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“…For practical applications it is also important to consider the significant axial force between the two discs. This is studied, e.g., in [24,30,33,34] and there it is shown that the force is maximum at zero torque and vice versa. This can be used to convert a rotation into an axial vibration (e.g., for dynamic vibration absorbers or for a lock that is opened by a magnetic key).…”

Section: Resultsmentioning

confidence: 99%

The Maximum Torque of Synchronous Axial Permanent Magnetic Couplings

Ausserlechner¹

2012

PIER B

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Abstract-Axial permanent magnetic couplings are composed of two discs with a small air-gap in-between. Each disc consists of several segments in the shape of slices of cakes. The segments are polarized in axial direction with alternating polarity. In this work the homogeneous magnetization in the segments is replaced by equivalent currents on the surface of the segments (Amperean model). In a simplified model we consider only radial currents whereas azimuthal currents along the perimeter of the discs are discarded. This corresponds to the arrangement where one of the discs has much larger diameter than the other disc. Compared to the case of two equal discs it leads to a notable error in the magnetic field near the perimeter, yet it has only a small effect on the torque, especially for the case of optimum couplings. This trick allows for summing up the fields of all segments in closed form. A concise double integral over the radial magnetic field component describes the torque. An investigation of this integral reveals many properties of axial magnetic couplings: A diagram is introduced and areas in this diagram are identified where the torque shows overshoot, rectangular pulse shape or sinusoidal dependence versus twist angle between both discs. The diagram contains also a curve for maximum torque and one point on this curve is of considerable economic significance: It denotes the global maximum of torque over magnet mass.

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Section: Resultsmentioning

confidence: 99%

The Maximum Torque of Synchronous Axial Permanent Magnetic Couplings

Ausserlechner¹

2012

PIER B

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“…In the literature, there are two types of analytical modeling for magnetic actuator: -3D Modeling is based on Amperien model using Biot-Savart law or on Coulombian model using charge surfaces [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. These methods can be used only in free space without ferromagnetic material.…”

Section: Soft-iron Yokementioning

confidence: 99%

Three-Dimensional Analytical Model for an Axial-Field Magnetic Coupling

Dolisy

Lubin

Mezani

et al. 2014

PIER M

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Abstract-In this paper, we propose an analytical method for modeling a permanent magnets axial field magnetic coupling. The three-dimensional model takes into account the radial fringing effects of the coupler. The analytical solution requires resolving the Laplace equation in low permeability subdomains. The magnetic field calculation allows the determination of global quantities like axial force and torque. 3D finite element computations as well as measurements validate the proposed model.

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“…There are two main types of magnetic couplings: synchronous and asynchronous (eddycurrent), with radial and axial flux topologies. The synchronous magnetic coupling [1][2][3][4][5] consists of rare-earth permanent magnets (PMs) placed on both rotors that move at the same speed. It has a pull-out torque, which is the maximum torque that can be transmitted by the coupling before the stall.…”

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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An Investigation of Face Type Magnetic Couplers

Cited by 9 publications

References 3 publications

The Maximum Torque of Synchronous Axial Permanent Magnetic Couplings

The Maximum Torque of Synchronous Axial Permanent Magnetic Couplings

Three-Dimensional Analytical Model for an Axial-Field Magnetic Coupling

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

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