摘要
针对采用传统PI控制的磁轴承开关功放由于负载参数的变化导致功放输出特性变差的缺点,提出了一种适用于混合磁轴承的PWM开关功放模糊PI控制方案,该PWM功放采用了全桥拓扑结构的主电路,控制采用了基于模糊推理的自适应PI控制策略,能根据负载参数的变化,自适应调整控制参数,为混合磁轴承线圈提供双极性的控制电流。对该方案进行了仿真,并用DSP进行了数字实现。仿真和实验结果表明,该PWM功放的响应速度得到了提高,能够很好地跟踪给定信号,满足了高速磁悬浮飞轮的需要。
A hybrid magnetic bearing PWM switching power amplifier based on fuzzy PI control used by magnetic suspending flywheel is proposed to solve the problem of output characteristic deterioration due to loading parametric variation while using the conventional switching power amplifier in magnetic bearing control system. Full bridge main circuit topological structure and adaptive PI control strategy based on fuzzy inference are accepted, so that the control parameters can be adjusted self-adaptively according to the load parameter variation, and bipolar control current is supplied for the coil of hybrid magnetic bearing. The scheme is simulated and realized with DSP. The simulation and experiment results indicate that response speed of the PWM amplifier is improved and it can trace preset signal exactly, which meet the requirements of high speed magnetic suspending flywheel.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2008年第5期943-948,共6页
Chinese Journal of Scientific Instrument
基金
“十五”国家民用航天科研专项(科工计[2001]×××号)资助项目
关键词
飞轮
磁轴承
模糊控制
PWM
开关功放
flywheel
magnetic bearing
fuzzy control
PWM
switching power amplifier
