# FixedDisplacementPump

```model FixedDisplacementPump
extends HydraulicsByFluidon.Components.Pumps.Base.PartialDisplacementPump;
equation
pumpInt.volume = dispVolume;

annotation (
Documentation(info = "<html>\n            <p>\n                Model of a pump with fixed displacement volume and losses.\n            </p>\n            <p>\n                <center><img src=\"modelica://HydraulicsByFluidon/Resources/Images/Components/Pumps/FixedDisplacementPump.png\"></center>\n            </p>\n            <p>\n                The main parameters of the pump are its maximum <var>Displacement volume</var> and the \n                <var>Rotational moment of inertia</var>.\n            </p>\n            <p>\n                The losses are parameterised by providing volumetric and mechanical efficiencies <var>Volumetric efficiency</var> and <var>Mechanical efficiency</var> for a given operating point. \n                The operating point is characterised by a reference pressure difference <var>Reference pressure difference</var> and a corresponding shaft speed <var>Reference speed</var>. \n                Based on the entered values, the parameters of a laminar throttle (volumetric losses) and a linear damper (representing the\n                mechanical losses) are determined automatically. Unlike the efficiencies, the parameters of these two elements typically do not vary\n                significantly with the operating conditions.\n            </p>\n            <p>\n                The parameter <var>Ration external Leakage / total Leakage</var> allows to split the leakage between internal and external leakage. A gear pump e. g. typically has no \n                external leakage, <var>Ration external Leakage / total Leakage</var> has to be set to 0. In contrast, a piston pump has a significant external leakage\n                (0.5 < <var>Ration external Leakage / total Leakage</var> <= 1).\n            </p></html>"),
Icon(
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{-100, 10},
{-59, 10}}),
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{-100, -10},
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Line(points = {
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Line(points = {
{59, -10},
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Line(
origin = {91, 0},
points = {
{-9, -30},
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smooth = Smooth.Bezier),
Polygon(
origin = {44, -65},
rotation = 30,
fillPattern = FillPattern.Solid,
points = {
{80, 80},
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rotation = 150,
fillPattern = FillPattern.Solid,
points = {
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coordinateSystem(initialScale = 0.1)));
end FixedDisplacementPump;

```