【作者】 程广增；

【导师】 范瑜；

【作者基本信息】 北京交通大学 ， 电力系统及其自动化， 2008， 硕士

【摘要】 磁悬浮轴承具有非线性和开环不稳定性,需要先进的控制系统加以控制。磁悬浮轴承的性能优劣很大程度上取决于其控制系统的性能优劣。通过采用新型先进控制理论来设计控制器以满足磁悬浮轴承系统稳定性、鲁棒性的需求是重要的研究方向,展开磁悬浮轴承控制方法的研究有着非常重要的现实意义。文中首先对飞轮储能系统进行了介绍,对飞轮储能磁悬浮轴承进行了详细的阐述和受力解耦分析。然后设计了单自由度磁悬浮轴承控制实验平台,对其控制部分的位移传感器、功率放大器和执行机构三大部分进行了性能分析与选型。针对单自由度磁悬浮轴承实验平台进行了详细受力分析推导并通过试验测试建立了其数学模型。以此数学模型为基础进行了PID控制算法和滑模变结构控制算法的理论分析与MATLAB系统仿真。通过仿真具体比较以上两种控制方法的性能。仿真结果表明与PID控制理论相比,滑模变结构控制理论具有更良好的稳定性和鲁棒性,且能够在较短的时间内快速达到系统平衡,并对干扰信号具有较强的抑制作用。在理论分析与仿真的基础上,基于TMS320LF2407 DSP芯片设计了数字控制器,通过实验进一步验证控制方法的实际性能。实验结果充分肯定了滑模变结构控制算法的性能优越性。更多还原

【Abstract】 the magnetic bearing system has the performance of nonlinear dynamics and open-loop unstability, so the control system for magnetic bearing is needed. The magnetic bearing’s performance is highly depended on its control system. Using optimal control theory to design the controller is more important for magnetic bearing. It was great significant to study and analyze the control methods for magnetic levitation system.Based on the FESS, the magnetic bearing is introduced and the force of magnetic bearing is analyzed and decoupled. A single degree-of-freedom (1-DOF) magnetic levitation test-bed is designed. The sensor, excitation coil and power amplifier’s performances of the control system are analyzed. The force is particularly analyzed and mathematic model is derived based on this 1-DOF magnetic levitation test-bed. Studies of control theories are discussed base on this mathematic model. The controllers based on traditional control method (PID) and sliding model variable structure (SMVS) control method are discussed and simulated by MATLAB software. The performances of both control method are compared. The results of simulation show that the SMVS control method has more stability and more robust than PID control method. The SMVS control method can also reach the stability faster and has more power to restrain the noise distribution than PID control method.After the theory analysis and the MATLAB simulation, a numerical controller based on the DSP chip (TMS320LF2407) is designed. The lab experiment proved the result of simulation. The controller based on SMVS method is more stability and more robust for the magnetic levitation system.更多还原