PID control of micro feed mechanism based on magnetic levitation technology

A PID(Proportional-Integral-Differential) controller was used to control the feeding movement, and a series of simulated experiments was completed. Experimental results indicate that if the magnetic damping is constant, then the damping ratio should be 0. 5-1.0, the position overshoot is less than 0. 933% , and the absolute steady - state error is less than 1.77-2.30 μm; if the magnetic damping is a time varying system, the overshoot of position controlling is less than 3. 617% , and the absolute steady-state error is less than 0. 033 μm. The position controlling accuracy can reach nanometer accuracy degree.