Moog is expanding the family of electrohydrostatic drive systems (EAS) for industrial machines already launched at the end of last year. The latest model is the Compact EAS, which is ideally suited for applications that are characterised by high dynamics and power density, require programmable motion sequences and place high demands on accuracy and repeatability.
Typical applications for the new drive system include punching machines for automotive components, in metalworking processes such as pressing, cutting, forming and bending. But machines also benefit from the high performance of the Compact EAS when pressing, punching and cutting other materials such as glass, ceramics, plastics and leather.
The Compact Electrohydrostatic Drive System (Compact EAS) consists of six elements: servo motor, internal gear pump, expansion tank, control block, shut-off valve and cylinder. Unlike conventional hydraulic systems, everything is integrated in the Compact EAS: there are no lines or hoses. Pump output and direction of rotation are controlled by the servo motor, eliminating the need for directional or proportional valves and creating a defined linear movement of the cylinder. Forces, speed and position on this linear actuation axis are freely programmable.
The high performance and power density of all Moog EAS actuator systems make them an attractive alternative to electrohydraulic (EH) or electromechanical (EM) systems. They are quieter, have significantly lower oil requirements and energy consumption, and are low maintenance due to the small number of components. "The Compact EAS offers users numerous advantages," says Harald Branz, Sales Manager Central and Eastern Europe. "The system is highly dynamic, energy-efficient and requires minimal maintenance. The Compact EAS is easy to configure and integrate into machine systems, offering significant cost advantages over other drive systems."
The new Compact EAS is available in three variants in the standard version:
- linear, in which the cylinder is on the same axis as the motor;
- parallel, in which the cylinder is located below the motor axis;
- orthogonal, where the cylinder is mounted perpendicular to the engine axis.
There is also a "split" version, where the cylinder forms a separate unit from the motor and pump assembly, without losing the advantages of the basic concept.
In the standard configuration, the Compact EAS can generate movement in the cylinder at a speed of up to 640 mm/s and a force of up to 500 kN. Customised versions can offer even significantly higher performance data. Customers can choose from stroke lengths of 50 to 400 mm. The positioning accuracy is within 0.01 mm, the repeatability up to 0.01 mm.
Depending on the required performance, installation interfaces and operating conditions, Moog assists the customer in selecting the most suitable Electrohydrostatic
drive system (EAS): customised, modular or compact.