基于洛伦兹力的无轴承电机优化与特性分析-《郑州大学学报(工学版)》

文章信息/Info

Title:: Optimization And Character Analysis For Bearingless Motor Based On Lorentz Force

Author(s):: Wu Huachun; Yang Shiping; School of Mechanical and Electrical Engineering, Wuhan University of Technology, Wuhan, Hubei 430070

Keywords:: bearingless motor; radial permanent magnetic bearing; current; axial lorentz force; FEA

摘要:: 传统无轴承电机将电机的旋转和径向磁悬浮支承功能集成于一体，具有支承无接触、无摩擦和无需润滑的优点，但是其转矩和径向悬浮力相互制约，永磁体厚度必须折中考虑，设计了一款基于洛伦兹力的无轴承电机，该无轴承电机可以同时产生转矩和轴向悬浮力，径向悬浮依靠径向永磁轴承实现。通过磁路欧姆定律推导了电机的轴向洛伦兹力的数学模型，采用有限元法分析了永磁体厚度、气隙长度和电流大小对轴向洛伦兹力的影响，结果表明，永磁体厚度增大使洛伦兹力无轴承电机的轴向承载力变大，永磁体厚度为3mm最合适。

Abstract:: Conventional bearingless motor integrated the rotation and radial suspension function with advantages such as contact-free, friction-free, but the torque and radial suspension force were inter-constraint. Thus, the thickness of permanment magnet must be taken into consideration. A novel bearingless motir was designed based on lorentz force. It could generate torque and axial suspension force at the same time, and the radial suspension of rotor depended on radial permanent magnet bearings(PMB). The mathematical model of Lorentz force at axial direction was deduced by using Ohm’s law of magnetic circuit. The influence of the air gap length, thickness of permanent magnet and current to axial Lorentz force was analyzed by using finite element method. The results showed that if the thickness of permanent magnet was increased, the axial bearing capacity would be larger,meanwhile, the optimal thickness of permanent magnet was 3mm.