Active Magnetic Bearing Digital Based On Lf2407a Dsp Control System

Active Magnetic Bearing (AMB) is a kind of novel high-performance bearing , because of the contact-free property between the rotor and stator , the rotor can rotate at very high speed , with almost no wear . So AMB has the advantages of long lifetime , low power loss , low noise and no lubrication . Thus AMB shows obvious advantages over conventional bearing in many application fields .The thesis educed the mechanics model of five-degree freedom rotor of magnetic bearing based on the analysis of the operation principle of AMB . Combining the mechanical parameters of a set of AMB flat for experiments , we get the mechanics model of this flat. Above work give a foundation for controller design .Ensuring the real-time operation of the control system of AMB , and making the CPU complete more and more advanced , complex control algorithms , the operation speed of CPU must be rapid enough . So this thesis used a piece of DSP chip : TMS320LF2407A, produced by TI(Texas Instruments) company of America to act as main CPU of our digital controller of AMB , and designed the hardware of the controller . This DSP chip is newest, fastest DSP of TI company's C2000 product pipeline these years . Then , this thesis provide a PID control model with a phase increased tache , and the digital difference equations which were fit for digital control algorithm of AMB are produced . Using these difference equations , a digital control software was weaved in DSP assembly language . The rotor can be suspended stably with the control of these control hardware and software . Next , in order to realize simulation debugging under static suspension condition , this thesis developed a DDS(Direct Digital Synthesis) signal generator specially designed for control parameters debugging , and the control parameters for high speed operation of AMB were established with the help of this DDS signal source . At last, the five-degree freedom magnetic rotor can be stably suspended and rotated at high speed(this AMB experiment flat can rotated stably 30,000 rounds per minute) . The stability and iteration performance of this digital control system were good , and the control precision has reached anticipated performance request.