Analytical study of axial-flux hybrid excitation eddy current brakes

Yazdanpanah, Reza; Mirsalim, Mojtaba

doi:10.3233/jae-140019

Cited by 16 publications

(12 citation statements)

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“…The braking torque calculation in this subsection was achieved by adding the correction factor, as given in Equation 5, while the correction factor was calculated using Equations (7) and (8). In Figure 4 shows the results of the modelling 3DFEM, which was undertaken to pass the critical speed.…”

Section: Braking Torque At Low-speed Calculation Using a Correction Fmentioning

confidence: 99%

“…The braking torque calculation in this subsection was achieved by adding the correction factor, as given in Equation 5, while the correction factor was calculated using Equations (7) and (8). In Equation (8), it can be seen that the effect of the turn path resistance is calculated using fixed design parameters. The same occurs in the calculation of Equation 7, which influences the flux leakage.…”

Section: Braking Torque At Low-speed Calculation Using a Correction Fmentioning

confidence: 99%

“…As such, the equation added by the correction factor will only change linearly. Moreover, based on the calculations of Equations (7) and (8), the values of each correction factor are fixed, namely α = 6.285 and C = 0.49. In the calculation of torque (Equation (5)), it can be seen that the torque value is proportional to the magnitude of the conductor rotation, so that the change in torque is proportional to the magnitude of the change in speed, as shown in Figure 5.…”

Section: Braking Torque At Low-speed Calculation Using a Correction Fmentioning

confidence: 99%

“…The central aspect that is most considered in determining the torque calculation approach is the calculation of the magnetic field density in its intensity or spread [7]. The approach to predict the braking torque can also be undertaken using analytical or numerical techniques [8]. Furthermore, to observe the magnetic flux and eddy current flow, modelling can be performed using a finite element method (FEM); therefore, a more distinct picture is obtained.…”

Section: Introductionmentioning

confidence: 99%

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A Novel Approach on the Unipolar Axial Type Eddy Current Brake Model Considering the Skin Effect

et al. 2020

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The braking torque mathematical modelling in electromagnetic eddy current brake (ECB) often ignores the skin effect that occurrs during operation. However this phenomenon can not be simply neglected. Therefore, this paper presents a mathematical model of braking torque for a unipolar axial type of ECB system with a non-magnetic disk, which considers the skin effects. The use of mathematical models that consider the existence of skin effects is significant in approaching the braking torque according to the actual condition. The utilization of generic calculations to the model of the ECB braking torque leads to invalid results. Hence, in this paper, the correction factor was added to improve the braking torque calculation as a comparator to the proposed equation. However, the modification and addition of the correction factor were only valid to estimate the low-speed regimes of torque, but very distant for the high-speed condition. From the comparison of calculated values using analytical and 3D modelling, the amount of braking torque at a low speed was found to have an average error for the equation using a correction factor of 1.78 Nm, while after repairing, a value of 1.16 Nm was obtained. For the overall speed, an average error of 14.63 Nm was achieved, while the proposed equation had a small difference of 1.79 Nm. The torque difference from the calculation results of the proposed model with the measurement value in the experiment was 4.9%. Therefore, it can be concluded that the proposed equation provided a better braking torque value approach for both low and high speeds.

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Section: Braking Torque At Low-speed Calculation Using a Correction Fmentioning

confidence: 99%

“…The braking torque calculation in this subsection was achieved by adding the correction factor, as given in Equation 5, while the correction factor was calculated using Equations (7) and (8). In Equation (8), it can be seen that the effect of the turn path resistance is calculated using fixed design parameters. The same occurs in the calculation of Equation 7, which influences the flux leakage.…”

Section: Braking Torque At Low-speed Calculation Using a Correction Fmentioning

confidence: 99%

Section: Braking Torque At Low-speed Calculation Using a Correction Fmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Novel Approach on the Unipolar Axial Type Eddy Current Brake Model Considering the Skin Effect

et al. 2020

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“…Eddy Current Braking (ECB) system [4] is a kind of non-contact braking method. It usually has a lower maintenance cost and longer service life.…”

Section: Introductionmentioning

confidence: 99%

Design of Double-Sided Linear Permanent Magnet Eddy Current Braking System

Chen¹,

Tan²,

Li³

et al. 2017

PIER M

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Abstract-This work tries to design an Eddy current braking system that can brake at a very high speed within a short time or a short distance. In order to maximize the braking force and reduce lateral forces that can cause track deformation or damage, a double-sided linear permanent magnet Halbach array is proposed in this paper. Two possible designs (Type I and Type II) have been investigated. By using mathematic models, Finite Element Method (FEM) and experimental results, Type I design of a double-sided linear permanent magnet Halbach array is selected. Compared with the other design, Type I design can provide a much larger braking force. Moreover, the analysis also shows that the mathematic models can well capture the characteristic of Type I design. Thus these models are used to design a set of optimal design parameters such as the length and thickness of permanent magnet block to maximize flux density and braking force per unit mass of permanent magnets. The optimal performance is validated by using FEM.

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