Novel Implicit Lorentz Force-Type Magnetic Bearing for High-Precision Agile Maneuver of Magnetically Suspended Gyrowheel

高精度敏捷机动磁悬浮陀螺飞轮用新型隐式洛伦兹磁轴承(英文)

The lorentz force-type magnetic bearing(LFTMB)with good linearity is suitable for the high-precision deflection control of the magnetically suspended gyrowheel(MSGW). Two kinds of novel implicit LFTMBs are proposed in allusion to the poor magnetic flux density uniformity of the existing explicit LFTMB. The improvement of uniformity is realized under the paramagnetic contribution of magnetic ring. Their structures are introduced,the mathematical models are established based on the equivalent magnetic circuit method and the magnetic fields are analyzed by the finite element method based on the design parameters. Simulation results indicate that the magnetic flux density uniformity of implicit LFTMBs is superior to the traditional explicit LFTMB. Furthermore,the implicit trapezoid LFTMB with double magnetic circuits is better than that of those with single magnetic circuit,in terms of the magnetic flux density uniformity and the magnetic flux density. The magnetic flux density of implicit trapezoid double magnetic circuits LFTMB is verified by the experiment. The error between the experimental results and the simulation results is within 5%,which shows that the implicit trapezoid double magnetic circuits LFTMB is promising to meet the high-precision agile maneuver requirement of the magnetically suspended gyrowheel.

具有良好线性的度洛仑兹力型磁轴承适用于磁悬浮陀螺的高精度偏转控制。针对现有显式洛仑兹力型磁轴承磁通密度均匀性差的问题,本文提出了两种可以提高磁通密度均匀性新型隐式洛伦兹力磁轴承。介绍了3种洛伦兹力磁轴承的结构,基于等效磁路法建立了其数学模型,并采用有限元法对磁场进行了分析。仿真结果表明,隐式洛仑兹力型磁轴承的磁通密度均匀性优于传统显式洛仑兹力型磁轴承。此外,双磁路隐式梯形洛仑兹力磁轴承在磁通密度均匀性和磁通密度方面优于单磁路隐式洛仑兹力型磁轴承。本文进一步对双磁路隐式梯形洛仑兹力磁轴承的磁通密度进行实验验证,实验结果与仿真结果误差不超过5%,说明双磁路隐式梯形洛仑兹力磁轴承可以满足磁悬浮陀螺高精度敏捷机动的要求。