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System concepts

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Constant torque constant Dpm. Changing rpm changing Q. a) Regulating the rpm or Vg of the pump ... Dpm. Q. np2. 2005/2006 I. Hydraulic and Pneumatic Systems. 4 ... – PowerPoint PPT presentation

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Title: System concepts


1
System concepts
  • Circuits with flow sources

Only one user can be delivered from one source
Concepts
2
System concepts
  • Circuits with flow sources

Without restriction valve
The pump delivers under constant conditions. If
the load changes, the rotational speed of the
motor changes. If the load change is under a
certain limit, the rpm change is small.
If it is large (Dp2) then the rpm will go down
drastically and the flow source is transformed
into a pressure source.
3
System concepts
  • Circuits with flow sources

What happens if we want to change the rpm of the
motor at constant torque?
Constant torque ? constant Dpm Changing rpm ?
changing Q
a) Regulating the rpm or Vg of the pump
4
System concepts
  • Circuits with flow sources

b) By restriction in series
A1 lt A2 lt A3
?pp ?pr ?pm
  1. Qp Qr Qm
  2. Qp Qrv Qr

nm can be continuously adjusted
5
System concepts
  • Circuits with flow sources

b) By restriction in series (cont.)
If the load changes, how does the motor rpm
change by constant restriction valve opening?
c) Parallel restriction valve
Qp Qr Qm
?pm ?pr
6
System concepts
  • Circuits with flow sources

c) Parallel restriction valve (cont.)
The rpm can be changed by changing the
restriction area.
Here the load is constant
7
System concepts
  • Circuits with flow sources

We can use a flow control valve
c) Parallel restriction valve (cont.)
If the load is not constant
The rpm change is much smaller
8
Examples
  • Hydraulic press

9
Examples
  • Synchronous drive

10
The End
  • End of hydraulic part
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