Research Of Geometric Error Of AMB Rotor On Control Accuracy

Magnetic suspension technology has been developed rapidly. Compared to traditional bearing, the biggest superiority of a magnetic bearing is maneuverability and on-contact. In the magnetic suspension rotor system design, the sensor examination's displacement signal of rotor is the basis of the controller to the active control. It is the key of the whole research system.At present, the eddy current displacement sensor has the advantages of high sensitivity and linear measurement in the magnetic bearing systems. Compared to other displacement sensors, the eddy current displacement sensor has been extensive used, which through the rotor surface of the vortex signal measures displacement of the rotor center. Therefore, the displacement of test signals can not respond anchor point movement.Such as the cyclical geometric error causes the extra control signals, so that rotors will have vibration and increase more difficult of control. When the control signals in the frequency as same as the natural frequency of it, the rotor will increase the amplitude of the rotor until the bearing failure.As the magnetic bearing rotor displacement measurement value is in the same order of magnitude with it, the rotor geometric error in the displacement signal must be separated.By the analysis of the rotor geometry error signal, the thesis has compared with and summed up the major method of error separation.Based on the combination of the magnetic suspension sensor detection method and the geometric error separation, the separation method of the magnetic suspension is put forward. So the on-line detection and error separation method is proposed.Through the above study, a geometry error compensation method of the magnetic suspension is presented. It effectively decreases the impact of geometric error on the magnetic suspension rotor's control accuracy.