Package HydraulicsByFluidon.​Components.​Pumps
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Extends from Modelica.​Icons.​Package (Icon for standard packages).

Package Contents

Model HydraulicsByFluidon.​Components.​Pumps.​ConstantFlowPump
Partial Pump

Information

The component ConstantFlowPump constitutes a model of a flow source in which the delivery is calculated from the given nominal flow and the leakage.

Both internal and external leakage depend on the adjacent pressure difference. The parameter Nominal volume flow refers to the flow at Port A (suction side).

The parameter Startup time > 0 describes the time, within whi ch the flow reaches Nominal volume flow starting at 0. The figure shows the startup function for Startup time = 1.

If Startup Time = 0, flow starts at Nominal volume flow.

The component does not provide a model of the physical design of a pump but only copies its characteristic features. Thus, physical parameters (e. g. inertia moment or hydraulic-mechanical efficiency) are not parameterized.

Extends from HydraulicsByFluidon.​Components.​Pumps.​Base.​PartialPumpWithLeakage.

Parameters

Connectors

Model HydraulicsByFluidon.​Components.​Pumps.​VariableFlowPump
Partial Pump

Information

The component VariableFlowPump constitutes a model of a flow source in which the delivery is calculated from the given nominal flow, the input signal and the leakage.

Both internal and external leakage depend on the adjacent pressure difference.

The parameter nominalVolumeFlow refers to the flow at Port A (suction side).

The valid range of the input signal at port setpoint is 0 < signal < 1. Therefore 1 corresponds to 100 % of the nominal volume flow.

VariableFlowPump does not provide a model of the physical design of a pump but only copies its characteristic features. Thus, physical parameters (e. g. inertia moment or hydraulic-mechanical efficiency) are not parameterized.

Extends from HydraulicsByFluidon.​Components.​Pumps.​Base.​PartialPumpWithLeakage.

Parameters

Connectors

Model HydraulicsByFluidon.​Components.​Pumps.​VariableFlowPumpCC
Partial Pump

Information

The component VariableFlowPump constitutes a model of a flow source for closed circuit applications, in which the delivery is calculated from the given nominal flow, the input signal and the leakage.

Both internal and external leakage depend on the adjacent pressure difference.

The parameter nominalVolumeFlow refers to the flow at Port A.

The valid range of the input signal at port setpoint is -1 < signal < 1. Therefore 1 corresponds to 100 % of the nominal volume flow.

VariableFlowPump does not provide a model of the physical design of a pump but only copies its characteristic features. Thus, physical parameters (e. g. inertia moment or hydraulic-mechanical efficiency) are not parameterized.

Extends from HydraulicsByFluidon.​Components.​Pumps.​Base.​PartialCCPumpWithLeakage.

Parameters

Connectors

Model HydraulicsByFluidon.​Components.​Pumps.​FixedDisplacementPump
Partial Pump

Information

Model of a pump with fixed displacement volume and losses.

The main parameters of the pump are its maximum Displacement volume and the Rotational moment of inertia.

The losses are parameterised by providing volumetric and mechanical efficiencies Volumetric efficiency and Mechanical efficiency for a given operating point. The operating point is characterised by a reference pressure difference Reference pressure difference and a corresponding shaft speed Reference speed. Based on the entered values, the parameters of a laminar throttle (volumetric losses) and a linear damper (representing the mechanical losses) are determined automatically. Unlike the efficiencies, the parameters of these two elements typically do not vary significantly with the operating conditions.

The parameter Ration external Leakage / total Leakage allows to split the leakage between internal and external leakage. A gear pump e. g. typically has no external leakage, Ration external Leakage / total Leakage has to be set to 0. In contrast, a piston pump has a significant external leakage (0.5 < Ration external Leakage / total Leakage <= 1).

Extends from HydraulicsByFluidon.​Components.​Pumps.​Base.​PartialDisplacementPump.

Parameters

Connectors

Model HydraulicsByFluidon.​Components.​Pumps.​VariableDisplacementPump
Partial Pump

Information

Model of a pump with variable displacement volume and losses.

The main parameters of the pump are its maximum Displacement volume and the Rotational moment of inertia. The displacement volume can be adjusted by using the setpoint signal:

setpoint = 0	displacement volume = 0
setpoint > 1	displacement volume = dispVolume sign(w) = sign(fluidPortA.mFlow)
setpoint < -1	displacement volume = dispVolume sign(w) = -sign(fluidPortA.mFlow)
1 > setpoint > 0	displacement volume = dispVolume * setpoint sign(w) = sign(fluidPortA.mFlow)
-1 < setpoint < 0	displacement volume = dispVolume * setpoint sign(w) = -sign(fluidPortA.mFlow)

The losses are parameterised by providing volumetric and mechanical efficiencies Volumetric efficiency and Mechanical efficiency for a given operating point. The operating point is characterised by a reference pressure difference Reference pressure difference and a corresponding shaft speed Reference speed. Based on the entered values, the parameters of a laminar throttle (volumetric losses) and a linear damper (representing the mechanical losses) are determined automatically. Unlike the efficiencies, the parameters of these two elements typically do not vary significantly with the operating conditions.

The parameter Ration external Leakage / total Leakage allows to split the leakage between internal and external leakage. A gear pump e. g. typically has no external leakage, Ration external Leakage / total Leakage has to be set to 0. In contrast, a piston pump has a significant external leakage (0.5 < Ration external Leakage / total Leakage <= 1).

Extends from HydraulicsByFluidon.​Components.​Pumps.​Base.​PartialDisplacementPump.

Parameters

Connectors