book in series
Integrated motor pump
The motor/pump unit can be installed as a single block in
special applications. This special design has two important
advantages: less space is needed as the coupling has no bell
housingand the prime mover is cooled down because the
oil is sucked through the motor itself (Figure 4.75). Yet, we
must stress that in this device the heat resulting from the
efficiencies of the circuit and the electric motor is yielded to
the oil, which warms up quickly. This unit is therefore suitable
for intermittent operation unless a good heat exchange is
guaranteed in continuous operation.
Figure 4.73
Load sensing pressure control performs tasks that are similar
to the previous one, but displacement variation does not
depend on the pressure over the outlet of the generator but
on the real pressure of the actuator. The power controller
guarantees a constant force on the actuators by acting on the
pressure/flow parameters (Figure 4.72).
The electronic proportional control ensures better results
(Figure 4.73). Transducers on the swash plate and the valve
(depicted in the drawing on the rod of the inclination piston
and next to the solenoid) guarantee high performances.
More transducers and different hydraulic valves can adjust
pressure/flow parameters in many different ways.
Figure 4.75
Figure 4.74
Figure 4.76
JuNe-july 2018 | Global MDA Journal | 69