Design and Optimization of a Radial Magnetic Bearing for High-Speed Motor With Flexible Rotor
Design and Optimization of a Radial Magnetic Bearing for High-Speed Motor With Flexible Rotor
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DOI：
10.1109/tmag.2014.2386298
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发表时间：
2015-06
影响因子：
2.1
通讯作者：
Yun Le;Jiancheng Fang;Kun Wang
中科院分区：
文献类型：
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作者：
Yun Le;Jiancheng Fang;Kun Wang
近年来，磁悬浮轴承的工业应用已从刚性转子系统扩展到柔性转子系统，这就需要研究柔性转子磁悬浮轴承的设计方法。为了减小控制线圈的电感，提高动态性能，本文提出了一种新型的线圈排列和连接的径向MB。提出了一种同时考虑磁轴承本身、转子动力学特性、控制器特性和功率放大器特性的磁轴承优化设计方法。以考虑涡流效应的等效磁路为分析模型，以谐振频率处的阻尼系数为目标函数。分析了偏置磁通密度对目标函数的影响，结果表明，增大偏置磁通密度可以减轻放大器的负担。实际的限制，如磁通密度约束，最大电源电压的AMP，绕组空间约束，极宽约束，铜线容量约束的设计。采用遗传算法和分支定界算法相结合的优化方法，得到了该磁悬浮轴承的最优结构参数。最后给出了设计实例并制作了样机。实验结果表明，所提出的磁悬浮轴承和优化方法在高速柔性转子中的应用是可行和有效的。
The industry application of magnetic bearing (MB) has recently extended from rigid rotor system to flexible rotor system; therefore, the design method of MB for flexible rotor is required. To reduce the inductance of the control coils and improve the dynamic performance, a radial MB with novel coil arrangements and connections is proposed in this paper. An optimal design method of the proposed MB is presented, which includes the simultaneous consideration of the MB itself, rotor-dynamics and the characteristics of the controller, and power amplifier (AMP). The equivalent magnetic circuit, which takes eddy current effects into considerations, is used as analytical model; the damping coefficient at resonant frequency is used as the objective function. The influence of the bias flux density on the objective function is analyzed, and the results show that increasing the bias flux density can reduce the burden on the AMP. Practical restrictions are also imposed, such as flux density constraint, maximum supply voltage of AMP, winding space constraint, pole width constraint, and copper wire capacity constraint on the design. By the optimization method of genetic algorithm and branch and bound algorithm, the optimal structure parameters of the proposed MB have been obtained. Finally, a design example is given and a prototype is manufactured. The experimental results demonstrate that the proposed MB and the optimization method are feasible and valid in the application to high-speed flexible rotor.