Analytical modeling of rotating eddy-current couplers

Canova, Aldo; Vusini, B.

doi:10.1109/tmag.2004.839730

Cited by 99 publications

(50 citation statements)

References 10 publications

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“…Compared with the traditional mechanical couplers, they offer main benefits of soft starting, vibration isolation, no maintenance, natural protection against overload and tolerance to shaft misalignment, and they can be used in many industrial applications, such as blowers, pumps, conveyors and damping systems. [1][2][3] Permanent magnet couplers directly use eddy currents to generate torque and the eddy currents induced in the copper plate lead to loss and temperature rise, therefore it is necessary to analyze the eddy current loss.…”

Section: Introductionmentioning

confidence: 99%

Eddy current loss calculation and thermal analysis of axial-flux permanent magnet couplers

Zheng

Wang

et al. 2017

AIP Advances

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A three-dimensional magnetic field analytical model of axial-flux permanent magnet couplers is presented to calculate the eddy current loss, and the prediction of the copper plate temperature under various loads is analyzed. The magnetic field distribution is calculated, and then the eddy current loss is obtained, with the magnetic field analytical model established in cylindrical coordinate. The influence of various loads on eddy current loss is analyzed. Furthermore, a thermal model of axial-flux permanent magnet couplers is established by taking the eddy current loss as the heat source, using the electromagnetic-thermal coupled method. With the help of the thermal model, the influence of various loads on copper plate temperature rise is also analyzed. The calculated results are compared with the results of finite element method and measurement. The comparison results confirm the validity of the magnetic field analytical model and thermal model.

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Section: Introductionmentioning

confidence: 99%

Eddy current loss calculation and thermal analysis of axial-flux permanent magnet couplers

Zheng

Wang

et al. 2017

AIP Advances

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“…Permanent magnet (PM) eddy-current coupling (PMEC) is a useful device for power transmission and speed adjustment, which has been studied intensively in recent years [1][2][3][4][5][6]. In general, the conductor rotor is slotless in PMEC.…”

Section: Introductionmentioning

confidence: 99%

“…The study of the magnetic field in PM devices can be achieved in two ways: numerical methods [1,2] and analytical methods [3][4][5][6][7][8][9][10][11][12]. Numerical methods such as the finite element (FE) method can yield accurate predictions of the performance of a device by considering the real geometry and nonlinear material properties, but the FE method is time-consuming because accurate results require a refined mesh of the model, which may limit its application to design optimization.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Analytical Solution of Magnetic Field in Permanent-Magnet Eddy-Current Couplings by Considering the Effects of Slots and Iron-Core Protrusions

Dai¹,

Liang²,

Ren³

et al. 2015

Journal of Magnetics

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In this study, we propose an analytical model for studying magnetic fields in radial-flux permanent-magnet eddy-current couplings by considering the effects of slots and iron-core protrusions on the eddy currents. We focus on the analytical prediction of the air-gap field by considering the influence of eddy currents induced in conducting bars. In the proposed model, the permanent magnet region is treated as the source of a timevarying magnetic field and the moving-conductor eddy current problem is solved based on the resolution of time-harmonic Helmholtz equations. The spatial harmonics in the air gap and in slots, as well as the time harmonics are all considered in the analytical calculation. Based on the proposed field model, the electromagnetic torque is computed by using the Maxwell stress tensor method. Nonlinear finite element analysis is performed to validate the analytical model. The proposed model can be used for permanent-magnet eddy-current couplings with any slot-pole combination.

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“…Permanent magnet eddy current brakes allows for eliminating the electrical supply system to simplify the brake structure and has higher efficiency due to no power loss and high force density. Adversely, field modulation is not allowed [8]. The hybrid excitation eddy current brakes combine advantages of the permanent magnet eddy current brakes and the electric excitation eddy current brakes.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Design of Hybrid Excitation Linear Eddy Current Brake

2014

IEEE Trans. Energy Convers.

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This paper presents a novel parallel magnetic path hybrid excitation linear eddy current brake. The eddy current brake using parallel magnetic path scheme with the presence of the PMs, whose flux lines in the primary are oppositely directed with respect to the flux lines by the excitation windings, has the effect of mitigating the saturation of the iron in the teeth of the primary. This allows the brake to be fed with more intense currents improving the braking force. The structure and working principle are introduced. The analytical model was found using the equivalent magnetic circuit method and the layer theory approach. The design method of the eddy current brake was studied using the finite element method. Compared with traditional induction motors and synchronous motors, the design method of the eddy current brake has not been proposed. Therefore, in this paper, the design parameters of the hybrid excitation linear eddy current brake were gradually determined by consulting the design method of the linear induction motor and linear synchronous motor, and a design flowchart was proposed. Finally, a prototype of hybrid excitation linear eddy current brake was created and an experimental study of the eddy current brake was conducted.Index Terms-Braking force analysis, design method, eddy current brake, experimental study, hybrid excitation.

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Analytical modeling of rotating eddy-current couplers

Cited by 99 publications

References 10 publications

Eddy current loss calculation and thermal analysis of axial-flux permanent magnet couplers

Eddy current loss calculation and thermal analysis of axial-flux permanent magnet couplers

Analytical Solution of Magnetic Field in Permanent-Magnet Eddy-Current Couplings by Considering the Effects of Slots and Iron-Core Protrusions

Analysis and Design of Hybrid Excitation Linear Eddy Current Brake

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