Affiliations: [a] College of Information Science and Engineering, Hebei North University, Zhangjiakou, China | [b] Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, China | [c] Science and Technology on Transmission Laboratory, North Vehicle Research Institute, Beijing, China
Correspondence:
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Corresponding author: Desheng Li, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China. E-mail: dsli@bjut.edu.cn, dslibjut@163.com
Abstract: In this article, a clear and concise analytical method for predicting the performance of a Liquid-cooling eddy current brake (LC-ECB) is proposed. The LC-ECB has a coolant channel in the rotor to allow direct cooling of the inner surface of the stator. The static air-gap magnetic field distribution is obtained by the dynamic magnetic equivalent circuit (MEC) method, and the magnetic flux leakage and global magnetic saturation effects are fully considered. The magnetic field intensity distribution function of the eddy current reaction magnetic field is derived for the first time based on Ampere circuital theorem. Considering the local magnetic saturation and skin effect, a novel double-iteration algorithm based on the conservation principle of magnetic pressure drop is applied to obtain the transient air-gap flux density distribution, and then the brake torque expression is obtained. The finite element method (FEM) and experimental results show that the proposed method is feasible and effective. The new model is easy to program and can be easily used in the initial design and optimization of LC-ECB.
Keywords: Eddy current brake, magnetic equivalent circuit, magnetic field distribution, magnetic saturation, skin effect
