磁力轴承用两电平数字开关功放仿真与实验研究

Simulation and Verification of Two-level Digital Switching Power Amplifier for Magnetic Levitation Bearing

本文阐述了磁力轴承用两电平数字开关功放的实现原理,从理论上分析了数字功放的评价指标电流响应速度与电流纹波,考虑开关管、二极管特性等非线性因素,推导了电流纹波的理论表达式;考虑AD量化过程,建立了基于Simulink的仿真模型,并进行了仿真;搭建了数字功放实验平台,进行了不同工况下的实验研究。结论表明,仿真模型与实际功放的带宽比较接近,电流纹波的理论值、仿真值、实验测试值较为接近。

This paper describes the principle of two-level digital switching amplifier for magnetic bearings, and theoretically analyzes the current response speed and current ripple of digital amplifier. Considering nonlinear factor switch and diode characteristics, the theoretical expressions of current ripple are derived, the simulation model is established based on Simulink considering AD quantization, and the experimental platform of digital amplifier is built for experimental research in different conditions. The conclusions show that the bandwidth of simulation model is close to the actual amplifier, and the current ripple is also close among the experimental values, the simulated values and the theoretical values.