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针对微框架磁悬浮飞轮用磁阻力磁轴承存在偏转负力矩和洛伦兹力磁轴承气隙磁密均匀性较差的缺点,提出了一种基于球形转子的微框架磁悬浮飞轮,介绍了其结构、工作原理和洛伦兹力磁轴承方案。采用等效磁路法建立了洛伦兹力磁轴承磁路数学模型,得到了其径向偏转力矩和轴向平动悬浮力。利用电磁场数值分析法,对三种洛伦兹力磁轴承方案的磁密和磁通进行比较分析,得到了最优的球面梯形磁钢方案。在此基础上,结合15Nms微框架磁悬浮飞轮技术指标,对磁轴承进行了详细实例设计。根据设计结果研制了一台微框架磁悬浮飞轮,并利用线性磁密霍尔对磁轴承气隙磁密进行动态测试。测试结果与优化结果一致,对微框架磁悬浮飞轮系统整体设计具有重要意义。
Aiming at the disadvantage that the negative magnetic moment of the magnetoresistance magnetic bearing for the micro-frame magnetic suspension flywheel and the magnetic flux density uniformity of the Lorentz force magnetic bearing are poor, a micro-frame magnetic levitation flywheel based on a spherical rotor is proposed. Its structure , Working principle and Lorentz magnetic bearing program. Equivalent magnetic circuit method was used to establish the mathematical model of Lorentz magnetic bearing magnetic circuit. The radial deflection torque and axial levitation force were obtained. By using numerical analysis of electromagnetic field, the magnetic flux density and magnetic flux of three Lorentz magnetic bearing solutions are compared and analyzed, and the optimal spherical trapezoidal magnet solution is obtained. On this basis, combined with the 15Nms micro-frame magnetic flywheel flywheel technical indicators, a detailed example of the magnetic bearing design. According to the design results, a micro-frame magnetic suspension flywheel was developed, and the linear magnetic density Hall was used to test the air-gap flux density of the magnetic bearing dynamically. The test results are consistent with the optimization results, which is of great significance to the overall design of micro-frame magnetic suspension flywheel system.