Analytical Model for a Permanent Magnet Eddy-Current Brake With Transverse Edge Effect

Jin, Y.; Li, Liyi; Li, Chunyan; Pan, Donghua; Song, Kai

doi:10.1109/access.2019.2915973

Cited by 12 publications

(5 citation statements)

References 25 publications

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“…where p is the number of teeth of the rotor; µ 0 is the air permeability; µ 1 , µ 2 , µ 3 , µ 4 , µ 5 , and µ 6 are the relative permeability of R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 shown in Figure 3. The permeability of each part of the DAL-ECR in the static state can be obtained by an iterative method [1,15]. The air-gap magnetic reluctance of each part in the period can be obtained by…”

Section: Mec Analysis Modelmentioning

confidence: 99%

“…It starts by assigning an initial value to µ 1 , µ 2 , µ 3 , µ 4 , µ 5 , and µ 6 to determine the static reluctance network and compute the fluxes. The permeabilities of each part of the retarder are solved by the previous iteration method [1,15].…”

Section: Transient Permeability Correctionmentioning

confidence: 99%

“…Shin et al [12], Lubin et al [13], and Gulec et al [14] proposed analytical models which considered the actual closed path of eddy currents, respectively, but the models ignored the end effect of the magnetic field and the heat effect on conductivity. Therefore, Jin et al [15] and Lubin et al [16] proposed 3D analytical models for the end effect of the ECRs, respectively. Jin et al [17] and Ye et al [18] proposed analytical magnetic-thermal coupling models, respectively, and their computing results agreed well with the measured results.…”

Section: Introductionmentioning

confidence: 99%

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Modeling of a Dual Air-Gap Liquid-Cooled Eddy Current Retarder Considering Transient Permeability

Wenguang

Yan

2023

WEVJ

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This paper proposes a model for the electromagnetic performance of the dual air-gap liquid-cooled eddy current retarder (DAL-ECR) considering the transient permeability. First, the structure and working principle of the DAL-ECR are introduced. Next, the analysis model of the static air-gap flux density considering the flux leakage and end effect is established based on the piecewise function method and the magnetic equivalent circuit (MEC). Then, based on the skin effect of the electromagnetic field in the retarder, an iterative method for solving the transient permeability of the stator is proposed. According to Faraday’s and Ampere’s laws, the analysis model of the static air-gap flux density, and the transient permeability, the analysis model of the transient air-gap flux density is established. The braking torque of the DAL-ECR is then calculated while taking the actual path of the eddy current and the skin effect on the permeability of the stator into consideration. Finally, the calculation accuracy of the model was verified by the finite element method (FEM) and the bench test.

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Section: Mec Analysis Modelmentioning

confidence: 99%

Section: Transient Permeability Correctionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modeling of a Dual Air-Gap Liquid-Cooled Eddy Current Retarder Considering Transient Permeability

Wenguang

Yan

2023

WEVJ

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“…In the brake release process, special control logic is required to ensure that the brake is released under load. Friction disc brakes are the traditional solution and are usually driven by electromagnetic force (Jin et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of a hollow-ring permanent magnet brake for robot joints

Tan

Zheng

et al. 2022

Mech. Sci.

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Abstract. An electromagnetic brake is the key basic component to ensure the safety of robot joints. The conventional electromagnetic brake mostly uses a set of springs to provide braking force and solenoid power to provide a recovery force, which makes this kind of brake with large thickness and small braking torque that is not conducive to the application in light and small joint components. In many design processes, unclear understanding of the machine-electric-magnetic coupling characteristics leads to relatively simple theoretical models and inaccurate theoretical results, which do not provide more help for subsequent designs. In this paper, a hollow-ring type permanent magnetic power-loss protection brake, integrated inside a joint assembly, is designed. The brake uses rare earth Nd–Fe–B permanent magnets to provide braking suction instead of ordinary spring packs, and achieves motion guidance and braking torque transmission by means of leaf spring. Combined with the deformation model of the leaf spring and the magnetic circuit models of the brake under the power-on and power-off conditions, the overall coupling dynamics model of the brake is established. The theoretical results are compared through finite-element software, and a prototype is produced for experimental testing. Finally, the accuracy and validity of the theoretical model are verified, providing a theoretical and experimental basis for the design of this type of brake.

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“…Yinxi Jin proposed an analytical model that considers the transverse edge effect for bilateral-type permanent magnet linear motors. It further optimizes the previous damping force calculation model and improves calculation accuracy [14]. Babak Ebrahimi proposed an analytical model of eddy current damping force and a method of achieving a higher damping force.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Suppression of the Eddy Current Damping Force of the Cooling Plate of a Permanent Magnet Linear Motor

Wang¹,

Sun²,

Kang³

et al. 2021

Symmetry

Self Cite

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This paper proposes a new symmetrical cooling plate. It can significantly reduce the eddy current damping force of the water-cooled metal plate. To increase the thrust density of coreless permanent magnet linear motors, cooling plates must be placed on the armature surface to reduce the temperature rise that is caused by high electrical density. However, when the motor moves at a high speed, extra damping force will be generated in the cooling plate, which affects the thrust quality and precision of the permanent magnet linear motor. In this study, we elaborate the mechanism of damping force generation in the cooling plate and propose a new symmetrical cooling plate with low damping force. This paper introduces the topology of a linear motor cooling system and presents an analytical model of the eddy current distribution of a water-cooled plate. The surface current equivalence method is used to calculate the magnitude of the damping force. A new, symmetrical water-cooled plate design method is proposed. This method uses the eddy current vector synthesis principle to cancel the eddy currents that are generated in each region, and to reduce the damping force that is generated in the cooling plate during motor motion. Finally, a 3D simulation model of the motor system is established and an experimental platform is built. The correctness of the analytical model and the effectiveness of the cooling plate design are verified using a simulation and an experiment.

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Analytical Model for a Permanent Magnet Eddy-Current Brake With Transverse Edge Effect

Cited by 12 publications

References 25 publications

Modeling of a Dual Air-Gap Liquid-Cooled Eddy Current Retarder Considering Transient Permeability

Modeling of a Dual Air-Gap Liquid-Cooled Eddy Current Retarder Considering Transient Permeability

Design and analysis of a hollow-ring permanent magnet brake for robot joints

Analysis and Suppression of the Eddy Current Damping Force of the Cooling Plate of a Permanent Magnet Linear Motor

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