DSP-Based Control System Design Of Magnetic Levitation

This dissertation studies and designs a kind of magnetic floating north finder utilizing that the bearing of single degree freedom gyroscope's framework is levitated without friction based on the characteristic that the rotor and stator of magnetic floating bearing have no osculation, so that the speed and the precision of north finder are greatly improved.Based on the analysis of the components and work principle, the dissertation designs a PID controller utilizing the method in frequency domain and time domain. Then, simulation of the control system is done in the Simulink, and we get the position response curves demonstrated that the control system have the characteristic of fast response, good stability and anti-disturb in the use of PID controller.In the design of hardware, it uses the DSP TMS320F2812 which is TI (Texas Instruments) company's C2000 product pipeline, as the CPU of our digital controller of magnetic bearing system, in which analog MUX is served for the signal sampling of 5-channel displacement sensors, and the D/A converter circuit controlled in the mode of read-write is designed independently to control 5-channel linear power amplifiers in order to drive differential electromagnetic coils. The software of magnetic bearing's digital controller is designed in the C and Assembly Language.At last, the dissertation has accomplished the design of the control system. The results of debugging and performance testing indicate that the controller based on DSP can work well and the performance of it complies with the requirement of magnetic control. At the same time, it can be expanded so that advanced control method would be used on it to improve the performance of the magnetic bearing.