Table of Contents
Advertisement
Manual 82566
The controlling element of the EG-6 and EG-10 Proportional Actuators is an
electrohydraulic transducer which controls oil flow to and from the power piston
through the action of a polarized solenoid. The position of the actuator output
shaft is proportional to the input current of the solenoid coil controlling the
hydraulic pilot-valve plunger.
The EG-6/10 Proportional Actuator is available with either a drive shaft or an oil
motor. The drive shaft is driven by the prime mover to provide relative rotation
between the pilot-valve plunger and bushing, and also to rotate the oil pump
gears. The direction of rotation (clockwise or counterclockwise) is determined by
the placement of plugs in oil passages in the actuator to maintain the operating
oil pressure at about 1724 kPa (250 psi) above supply pressure in the EG-6 and
about 2758 kPa (400 psi) above supply pressure in the EG-10.
The EG-10P actuators that do not have an oil pump are equipped with an oil
motor. Oil under pressure must be supplied to the actuator: to provide working
pressure for the actuator and to rotate the pilot-valve bushing. Work output of the
EG-10P actuator equipped with an oil motor depends upon the pressure of the oil
supplied to the actuator.
Table 1-1. Governor Oil Pressure vs Maximum Work Output
Governor Operating
Oil Pressure
2758 kPa (400 psi)
2068 kPa (300 psi)
1724 kPa (250 psi)
1379 kPa (200 psi)
690 kPa (100 psi)
The EG-10P can be equipped with either a Pickering or Kearfott Rotary Variable
Differential Transformer (RVDT) for operation of a gas valve, mechanical load
sharing, pitch control, or any application where valve or fuel-rack position is a
function of the control. A minimum-position switch is available for applications
which require this protection.
The governor system includes:
A Woodward electronic governor
A magnetic pickup
A speed-setting potentiometer (optional)
A proportional electrohydraulic EG actuator described in this manual
Output pulses (proportional to prime mover speed) from the magnetic pickup are
processed by the speed sensor section of the electric governor and are applied as
a dc voltage (proportional to prime mover speed) to the summing point of the
control amplifier section of the electric governor. This speed voltage is compared to
a dc reference voltage from the speed-setting potentiometer, which corresponds to
Woodward
Released
Chapter 1.
General Information
Description
Maximum Work
Capacity
12.6 J (9.30 ft-lb)
9.5 J (7.00 ft-lb)
8.1 J (6.00 ft-lb)
6.3 J (4.65 ft-lb)
3.1 J (2.30 ft-lb)
Governor System
EG-6P/PC, EG-10P/PC Actuator
7
Hide quick links:
Advertisement
Table of Contents
