Studying of NC Tool Crossbeam Magnetic Levitation System Based on Backstepping Adaptive Dynamic Sliding Mode Control

At the moving crossbeam levitation system of the gantry NC machine tool, backstepping adaptive dynamic siding mode control was proposed to achieve the high precision and steady levitation of the gap due to the effect of the cutting force on magnetic levitation system. Considering that the speed state variable is nonmeasurable, a state filter K was designed to estimate the parameter on line. The simulation results show this method can effectively decrease chattering of siding mode controller and keep the stability of levitation system. Meantime, this controller has powerful ability of suppressing disturbance and high rigidity.