Benefits

• Compact packaging minimizes space demands

• Matched drives and motors from a single supplier

• Complete system testing provides high reliability

• Terminal block connections for ease of wiring

• Multiple methods of speed control

• Input voltage

• Internal potentiometer

• External potentiometer

• External voltage reference

Markets

• Industrial Production Machinery

• Plastic Machinery

• Simulation

• Metal Forming Machinery and Presses

• Gas and Steam Turbines

• Wind Energy

• Oil and Gas Generation and Production

The EPU-G, featuring a 4-quadrant internal gear pump and a high dynamic

servomotor, targets applications with flow rates below 80 l/min and pressure

levels up to 345 bar where high dynamic response and power-density are key.

Engineered for direct control via pump speed, the EPU-G is suitable for self

contained hydrostatic transmissions and can build maximum pressure at both

pump ports. It is available in sizes 13 and 20 cm3. Sizes 5 and 8 cm3 will follow.

This is adding smaller pump volumes to the existing EPU product range, which

spans from 19 to 250 cm3.

The EPU-G’s variable speed and power-on-demand operation reduce noise

emissions at partial load, significantly lowering energy consumption and

operating costs. With high dynamics, low inertia and minimal pulsation, the

EPU-G enhances overall machine performance. Its compact axial mounting

interface allows direct manifold connection without additional piping, resulting

in increased system stiffness, reducing actuator footprint, simplifying machine

design, and reducing setup and maintenance time.

Addressing customer needs for ease of use, modularity, electrification, energy

efficiency, robustness, serviceability and sustainability, the EPU-G’s compact

design and reduced complexity make it easy to handle and integrate without

requiring extensive hydraulic expertise. Moog provides an end-to-end product

offering and supports customers in the transition from conventional hydraulic

or electromechanical to electrohydrostatic actuation from system design to

implementation.

ADVANTAGES

• No min. speed: Allows 0 rpm, easy close-looped control for a limited period

of time

• High dynamics: Increases machine performance, position/ pressure/ force

control

• 4-quadrant operation: eliminates the need for a control valve; helps realize

close-looped control

• Predefined range and combinations:

Simplifies maintenance and spare parts storage

• Manifold interface enables direct mounting, less piping, compact actuator

design

• High Efficiency: Ensures thermal stability, reduced losses

APPLICATIONS

• Applications with distinctive rapid and force movement / maximum utilization

of drive power i.e. medium and large size presses

• Steam, water and gas turbines

• Solar panel adjustment

• Process flaps and valves

• Commercial and municipal vehicles

• Construction and mobile machinery

• Active motion/bogie control (e.g. tilt trains)

• Chipboard and paper presses

• Food industry

Overview

The Moog Electrohydrostatic Pump Unit (EPU / EPU-G) is at the heart of

electrohydrostatic actuation systems enabling the deployment of a

decentralized drive system. This eliminates the need for a hydraulic power

unit and complex piping and helps reducing the overall machine footprint.

The compact product design features a unique interface that enables direct

mounting on to a cylinder or manifold thereby minimizing the requirement

of additional space on each axis.

Addressing customer needs for convenience, modularity, electrification,

energy efficiency, robustness, serviceability and sustainability, the compact

design and reduced complexity make it easy to handle and integrate without

requiring extensive hydraulic expertise.

The EPU-G (sizes 13 and 20) utilizes an internal gear pump to generate flow.

The EPU (sizes 19. 32. 80. 140 and 250) uses a radial piston pump available

in two versions: Fixed or dual displacement.

The Moog Electrohydrostatic Pump Unit ( / EPU-G) is at the heart of

electrohydrostatic actuation systems enabling the deployment of a

decentralized drive system.

This eliminates the need for a hydraulic power unit and complex piping

and helps reducing the overall machine footprint.

Benefits:

• High energy efficiency.

• Reduces oil volume by up to 90%, supporting sustainable and clean

operations, reducing maintenance and operating costs and the risk of fire.

• High-force capability provides a viable alternative to EH actuation.

• Unique manifold interface enables direct mounting reducing piping and 

maintenance efforts and machine footprint.

• Self-contained and compact product design reduces space requirements

for the machine.

• 4-quadrant operation.

Modern machine designs are more and more based on Electrohydrostatic Actu

ation Systems (EAS) instead of valve-based throttle control. During this trans

formation, the installed power of the used EPU-axes and their Servo Drives

often surpass the power of the formerly used hydraulic power unit, especially

when hydraulic accumulators were used.

Moog combines the best fitting power infeed with storage units to reduce the

installed power significantly. Together with the efficiency gain of the EAS and

the peak power reduction of the Moog Energy Management System, hydraulic

machines reach a new level of attractiveness.

The Energy Management System as add on to EAS provides multiple benefits

to machine end-users and to OEMs. Additionally, the EMS can also be used for

electromechanical actuation systems.

MOOG EVALUATION PROCESS

Through in-depth simulation of the application including energy management,

the best fitting storage and infeed is evaluated. In this process the customer is

pro-activly consulted on energy savings, grid loading and amortization, amongst

others.

ADVANTAGES

• Reduces installed power significantly and thus in-line components up to the

transformer (peak shaving)

• Maximizing machine efficiency through energy storing and minimizing losses

• Modular approach: For each application the right infeed and storage type

APPLICATIONS

• Material testing and simulation platforms

• Cyclic high pressure compression axis

• Metal forming and presses