Analysis of load model and design of motion controller for neutron chopper disk

In order to realize high speed motion control with high precision, the load characteristics of the chopper disk were analyzed, and the mathematic model of the controlled object, which was a two-mass model composed of disk entity and drive motor, was established. Based on this model, a current-speed-position cascade controller was designed, and the select method of the adjusters structure and parameters was given, based on the engineering design method and modern control theory. With a rotation frequency of 27.5 Hz, the position perturbation error ranged from -1.325 25 s to 1.325 25 s, and the steady-state error was -2.583 s, which met neutron choppers application requirements.