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中文摘要：
针对高速磁悬浮电动机中纯电磁轴承采用固定偏置电流功耗较大的问题，在PID控制基础上介绍了一种自适应变偏置电流的控制方法，建立了PID控制比例环节与偏置电流和电磁轴承综合刚度间的关系模型，推出了电磁轴承功耗与偏置电流间的关系，结合约束条件，得到了最低功耗时偏置电流与转子位移和电磁轴承综合刚度间的函数关系。在控制过程中，电磁轴承综合刚度是对比给定的，转子位移通过电涡流位移传感器进行检测。理论分析和试验结果均表明：该方法在保证系统稳定性的前提下，可以有效降低电磁轴承的功耗。
英文摘要：
The bias current of active magnetic bearings in high speed magnetically suspended naotor is set to be a fixed value which is inefficient in terms of the power consumption. To reduce power loss, an adaptive variable bias current control scheme is introduced based on the PID control, the relationship model is built for the proportional part of the PID control with the bias current and composite stiffness of the magnetic bearings, and the relationship between the power consumption and the bias current is got. Combination of constraints, the expression for the bias current as a func- tion of the rotor displacement and composite stiffness of the magnetic bearings is deduced when the energy consumption is the lowest. In the control process, the composite stiffness of the magnetic bearings is comparatively given, and the rotor displacement is detected by the eddy current displacement sensor. The experiment results show that this method can effectively reduce the power consumption of the magnetic bearings under the premise of ensuring the stability of the system.
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