Abstract
To solve the problems that general proportional valve can’t meet the requirements of high precision control, the paper describes the generation mechanism of kinetic energy in the accurate spool displacement control system of the small flow rate proportional valve. The mechanism of kinetic energy and displacement control of spool under disturbance are discussed quantitatively. Based on DSP and the mathematical model established, the digital state observer feedback control system is designed. The experiment shows that the system can restrain disturbance effectively, and the control accuracy of spool displacement is high, which is up to the level of 5μm.
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