The basic requirements for the servo system are stability, precision and fast response.
Good stability: After the disturbance acting on the system disappears, the system can return to the original stable state or under the action of the input command signal, the system can reach a new stable operation state, under the action of a given input or external interference can reach a new state or return to the original equilibrium state after a short adjustment process;
High precision: The precision of the servo system refers to the accuracy with which the output quantity can follow the input quantity. As a CNC machine tool for precision machining, the required positioning accuracy or contour machining accuracy is usually relatively high, and the allowable deviation is generally between 0.01 and 0.001mm;
Good fast response: There are two meanings, one is the rapidity of the change of the output quantity with the input command signal during the dynamic response process, and the other is the rapidity of the end of the dynamic response process. Fast response is one of the signs of the dynamic quality of the servo system, that is, the response of the tracking command signal is required to be fast. On the one hand, the transition process time is required to be short, generally within 200ms, or even less than tens of milliseconds; Requirements, the leading edge of the transition process is required to be steep, that is, the rate of rise should be large.
High energy saving: Due to the fast response of the servo system, the injection molding machine can quickly adjust the supply according to its own needs, which can effectively improve the utilization rate of the electric energy of the injection molding machine.