Analytical study and modeling of the effect of high acceleration on the electromagnetic resistance of eddy current brake

With the development of application and research of eddy current brakes (ECB) in various fields, the application of ECB in large braking machines targeting strong impact load is beginning to be explored. When braking against strong impact load, a high acceleration phase will exist, and sometimes under this special condition, a high peak of electromagnetic resistance will appear, which can disturb the braking effect of the ECB. The effect of high acceleration on the electromagnetic resistance characteristics of ECB under such special application conditions is of concern. In this paper, the change of electromagnetic field under high acceleration is analyzed. Combining the working principle of eddy current brake with the data obtained from FEM model, the principle equation and explanation analysis are given. By comparing the electric field distribution with and without high acceleration, effects of high acceleration at different velocity stages on the eddy current electric field are discussed. In order to be able to better predict the resistance of the ECB under strong impact loads, an electric field strength incremental considering high acceleration was introduced according to a simplified analytical model combining the MEC model with the equivalent electric field approach. Numerical modeling was performed based on the data obtained from FEM models, and the final model obtained is verified by comparison with experimental results. In this paper, combining analytical modeling, finite element modeling and numerical modeling, an analytical model of electromagnetic resistance and braking process considering high acceleration is proposed, and the braking process can be simulated quite accurately. Future research can use this model to optimize the design of the ECB mechanism to obtain a more efficient braking force and a smoother braking process.