Research On Integrated Control System For Magnetic Bearings Based On FPGA

The magnetic bearing control system based on DSP or analog devices has the disadvantages of low integration and large volume.In order to reduce the volume and power consumption of the magnetic bearing control system and further improve the integration of the system,the integrated control system for magnetic bearing was researched.An FPGA chip is used to implement the rotor position control,power amplifier current control and modulation algorithm.Firstly,the model analysis of the magnetic bearing system is carried out,and the mathematical models of the electromagnet-rotor,sensor and power amplifier are derived.Through MATLAB/Simulink modeling,the simulation analysis of the entire control system is carried out,which verifies the feasibility of the implementation of the control system's software and hardware,analyzes the current characteristics of bidirectional digital power amplifier under different modulation strategies,and lays a foundation for the subsequent hardware design and control algorithm research.Secondly,the hardware and software of the magnetic bearing integrated control system are designed.In the hardware design,Cyclone V E series FPGA chip with high performance and low cost is used as the main control chip,and ADS8364 chip with high precision and high performance is used as the sampling chip.The design of filter conditioning,sampling circuit and FPGA minimum system circuit is completed,which improves the integration and reliability of the system.In the software design,the clock management module,AD sampling control module,position control module,current control module and PWM modulation module are programmed in FPGA.Finally,the permanent magnet biased magnetic bearing test bed was built for experimental research.Firstly,the controller was debuted at board level.After passing the debugging,the static performance and dynamic performance of the digital amplifier were tested.Then,the floating and static suspension tests of the rotor were carried out on the test bench of the magnetic bearing.and the stable floating and stable suspension of the rotor was realized.The vibration displacement of the rotor during the static suspension was less than 6?m.