modeling the rotor dynamics of electrospindle on magnetic bearings

The research object is the rotor of electrospindle on magnetic bearings.

The purpose of work is positioning of the rotor center no more than 0.5 microns. The rotor on magnetic bearings rotates with a speed of 5 000 rpm and 42 000 rpm and is subjected to constant and periodic action of an external disturbance.

Research of the existing technical solutions in the field of electrospindles on magnetic bearings is conducted. Despite the known benefits of magnetic suspension a number of problems in the application of such structures in electrospindle units is identified due to their high cost and lack of control reliability. To solve the assigned task the following assumptions are accepted: the rotor unbalance is equal to zero, movement of the rotor along axis Z is absent, in the initial position the center of mass C coincides with the center of the inertial reference system OXYZ , displacements and rotations are assumed to be small compared to the size of the rotor. Modeling of dynamics of the rotating rotor on magnetic bearings is realized. The control system based on PID controller to provide the desired value of the maximum displacement of the rotor is developed. The analysis of rotor dynamics taking into account the accepted assumptions is carried out and further study of this subject in order to improve the existing system of positioning control of the rotor that can reliably stabilize the rotor magnetic bearings under the influence of various factors is planned.