| As one of the supporting components, which can be controlled actively, active magnetic bearing (AMB) has been widely used in many machines with high rotation speed in many kinds of fields because of its high performances beyond other traditional bearings. The basic research of the AMB has been achieved, but there are still many problems to be solved before putting them into industrial applications. One of them is bearing-rotor system dynamics and its stability. This paper will deal with these problems, and mainly focus on the critical speeds and control of the rotating machinery supported by AMB.First, some methods and theories in traditional bearing-rotor dynamics are used, Dynamic modal of rigid magnetic suspended rotor was made, rigid rotor dynamic system model supported by AMB is given by introducing PD and PID control methods. The rigid magnetic suspended rotor mode is proved , influence of rigid magnetic suspended rotor mode by each control parameter was analyzed and integral constant doesn't influence the rigid magnetic suspended rotor mode which can be used to change the lower critical speeds by changing control parameters.The spindle is simplified as multi-discal rotor and complex stiffness is introduced to the Riccati transfer matrix to produce flexible magnetic suspended rotor modal .The critical speeds and stability are calculated and analyzed and compared with the experiment results.PI/PID control methods are introduced and stability and veracity are analyzed to calculate the differential constant,integral constant and integral gain. Theory and practical dynamic characteristics of rigid magnetic suspended rotor is simulated, which includes transient simulation, sine wave input simulation and disturbance simulation, unbalance compensation of rigid magnetic suspended rotor is simulated by using notch filter.All the research contributed to the further research development of modeling, dynamic characteristics and optimization of magnetic levitated rotor technology.
|
PDF Full Text Request