中文摘要：

研制基于数字信号处理器（Digital signal processor,DSP）和现场可编程逻辑阵列（Filed programmable gate array,FPGA）的三电平脉冲宽度调制（Pulse width modulation,PWM）型磁悬浮轴承数字功率放大器。用DSP芯片取代模拟电路进行比例积分（Proportion-integration,PI）调节、三角载波产生以及负载线圈驱动信号PWM波的产生,通过DSP内部程序实现PWM占空比在线调节,实时控制磁悬浮轴承负载线圈中的电流大小,从而控制转子稳定悬浮在平衡位置,并给出采用FPGA对驱动信号PWM波进行移相180°的方法,实现三电平的数字功率放大器。将此数字功率放大器应用于5自由度磁悬浮轴承试验台,实现了转子的静态稳定悬浮,静态悬浮时转子振动的峰峰值小于5μm。采用数字化的设计方法,能够优化磁悬浮轴承功率放大器的性能,且具有体积小、程序可移植性强、可靠性高等优点。

英文摘要：

The three-level pulse width modulation（PWM）type digital power amplifier of the active magnetic bearing based on digital signal processor（DSP）and filed programmable gate array（FPGA）is developed.The DSP chip is used to replace the analog circuit to carry out proportion-integration regulation,generate triangle carrier and generate PWM wave which is the driving signal of the load winding.Through the internal program of DSP,on-line adjustment of PWM duty cycle is realized and the line of current in the load winding of active magnetic bearing is controlled in real time,thus controlling the rotor to stably suspend in the balance position.The method of using FPGA to carry out 180°phase shift of the driving signal,i.e.PWM wave,is given,thus realizing three-level digital power amplifier.This amplifier is used in the 5-DOF active magnetic bearing test bed,so that the rotor suspends statically and stably while its peak value of vibration is less than 5μm.The approach of digital design can optimize the performance of the power amplifier,moreover it will have advantages such as small volume,strong program portability and high reliability.