servo motor controller system performance basic requirements: 1, high precision of displacement accuracy: refer to instruction pulse for machine table displacement and the instruction pulse by the servo system into the workbench's actual displacement degree of correspondence between 2, stability, good stability: refers to the servo system in the role of a given input or interference, can only after a short adjustment process, achieve the balance of new or restored to its original state. III, positioning accurate, princeps positioning accurate, est refers to the amount of output potest emersion input accuracy IV, bonum velox responsio V, VI, bonum Reliability VII, wide celeritate range