Design and analysis of double magnetic circuit rotating Lorentz force magnetic bearing
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摘要:
面向复杂航天任务对航天器有效载荷万向敏捷和超精指向性能迫切需求，提出一种洛伦兹力磁悬浮万向稳定平台，开展双磁路旋转洛伦兹力磁轴承设计与分析。采用动圈式转子方案，转子组件4条挂耳形线圈成对绕置并胶装于骨架轴向两侧凹槽内；定子组件成对平行布设共转轴、双环状轴向充磁磁钢，形成均匀性稳定磁密，为载荷舱敏捷机动提供周向双通道对称工作气隙。基于等效磁路法建立气隙磁密模型，从气隙磁密均匀度和波动率2方面定义磁密线性度，进而开展转子旋转动力学建模，构建旋转力矩模型。运用Maxwell有限元法建立旋转磁轴承有限元模型，并进行算例仿真，结果表明：所述旋转磁轴承方案气隙旋转包络中心位置处磁密可达685.624 mT，周向磁密均匀度为99.72%，大幅改善气隙磁密均匀性，避免了径向充磁式方案气隙磁密衰减和纵向磁场扩散的局限，有效提升载荷舱旋转状态下的稳定度和指向精度。
Abstract:A Lorentz force magnetic levitation universal stability platform was proposed in response to the pressing need for universal agility and ultra-precise pointing performance of spacecraft payload in complex space missions. The design and analysis of double-magnetic circuit rotating Lorentz force magnetic bearings were conducted, and the moving coil rotor scheme was chosen. The four-hanging lug-shaped coils of the rotor assembly were wound in pairs and glued into the grooves on both sides of the skeleton axial direction. The stator components are arranged in pairs in parallel with a common rotating shaft and a double annular axial magnetized magnetizer to create a uniform and stable magnetic density, and provide a circumferential dual-channel symmetrical working air gap for the agile maneuver of the load compartment. Based on the equivalent magnetic circuit method, the magnetic density model of the air gap was established, and the linearity of the magnetic density was defined from the two aspects of the uniformity and fluctuation rate of the magnetic density of the air gap, and then the rotor rotation dynamics was modeled and the rotational moment model was constructed. Utilize Maxwell's finite element method to establish a finite element model for rotary magnetic bearings and conduct the simulation, the results demonstrate that the magnetic density at the center position of the air gap rotation envelope of the rotating magnetic bearing scheme can reach 685.624 mT, and the circumferential magnetic density uniformity is 99.72%. This significantly improves the uniformity of air gap magnetic density, avoids the limitations of radial magnetization schemes such as air gap magnetic density attenuation and longitudinal magnetic field diffusion, and effectively enhances the stability and pointing accuracy of the payload bay under rotating conditions.
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图 1 洛伦兹力磁悬浮万向稳定平台结构
Figure 1. Lorentz force maglev universal stabilized platform structure
图 13 磁轴承2D结构磁密云图
Figure 13. Magnetic dense cloud diagram of magnetic bearing 2D structure
图 17 工作绕组区域周向磁密云图
Figure 17. Circumferential magnetic dense cloud diagram of the working winding area
表 1 双磁路旋转洛伦兹力磁轴承结构参数
Table 1. Double magnetic circuit rotating Lorentz force magnetic bearing structure parameters
扇形磁钢环
内径/mm扇形磁钢环
外径/mm扇形磁钢环
周向弧度/(°)扇形磁钢环
轴向距离/mm倒马鞍形导磁环
内径/mm倒马鞍形导磁环
外径/mm线圈径向有效
工作长度/mm单个线圈
匝数绕线
规格/mm50 70 140 8 50 86 16.5 100 0.25×2 
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表 2 双磁路旋转洛伦兹力磁轴承转矩参数
Table 2. Double magnetic circuit rotating Lorentz force magnetic bearing torque parameters
单个线圈匝数 通电电流/A 气隙磁密/T 转子旋转角度范围/(°) 100×2 0.65 0.67 120
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