摘要：采用磁轴承的高速永磁电机在遇到电力故障时，若没有保护措施，高速旋转的转子会直接掉落在保护轴承上，影响其寿命。针对该问题，选用Buck电路作为开关变换器的主拓扑结构，提出一种基于滑模算法和PID控制的磁悬浮永磁电机电力失效补偿方法，通过PID调节器保证系统的稳定控制精度，同时利用滑模算法提高系统在大信号扰动下的响应。仿真和实验结果表明，和传统基于电压闭环PID控制方法相比，这种电力失效补偿系统具有稳定性好，动态响应速度快，鲁棒性强的特点。

关键词：磁悬浮；电力失效补偿；Buck；滑模控制；PID

Abstract: The high speed rotor of magnetic suspended permanent magnet motor would directly touch down the protection bearings if power failure occured with non-effective compensation method. And the motor life would be dramatically reduced. To solve this problem, the buck converter was used and a power failure compensation method of magnetic suspended PM motors combining sliding mode and PID control algorithms was also proposed. The PID regulator was used to minimize the steady-state error, while the sliding mode controller was used to improve system response under large signal disturbances. Simulation and experimental results show that the proposed power failure compensation method has faster dynamic responses than traditional PID voltage loop feedback control method.

Key words: magnetic suspended；power failure compensation；Buck；sliding mode control；PID