Motion Control for Intelligent Hydraulic System

Motion Control for Intelligent Hydraulic System

Pressure and volume flow control of hydraulic applications is carried out principally by means of variable displacement pumps. Standard solutions use relatively primitive asynchronous motors that drive displacement pumps. This is connected to a control element whose task is to comply with the target values. The arrangement of this classical design is carried out by means of pressure transducers, control of pressure and flow velocities, which is quite coarse and therefore in the wrong regulation value ranges. Two other disadvantages are energy efficiency and noise emission, because asynchronous motors produce more reactive power and more noise than synchronous motors. In hydraulic applications, variable pressure and flow rate requirements are provided not by valves but by the speed of synchronized servo motor. servo drive, synchronous servo motor and a fixed pump. It gives the same volume with each cycle. As a result, this reduces the control quantity of the regulation function to pure speed.

The structure of this servo drive solution designed for hydraulic applications ensures that the regulation function is autonomously undertaken by the intelligent servo drive. The control unit, which is connected via a communication (fieldbus) or analog signal, can only prescribe the exact pressure and volume values ​​that the regulator adheres to at the speed. A further advantage in practice is that the target pressures and target volumes are stored in the actuator as profiles, via profiles or ramp graphs, and are immediately available for recall from the controller.