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MapleSim Hydraulics Library from Modelon

Variable Pump  Pump with losses and variable displacement

The Variable Pump component describes a pump with variable displacement and losses.

Implementation

See component Id Var Pump. The delivered flow rate at the outlet port of this model may be different because of flow into volumes and internal and external leakage.

Mechanical efficiency

This model includes a component for constant mechanical loss, set by the parameter mechanicalEfficiencyCoefficient.

Connections

Name

Description

Modelica ID

portA

Port A, where oil flows into the component (0<q, pB<pA means 0<&Delta;p)

port_A

portB

Port B, where oil leaves the component (q<0, pB<pA means 0<&Delta;p)

port_B

flangea

 

flange_a

flangeb

 

flange_b

oil

 

oil

commandSignal

Input signal commands relative displacement volume

commandSignal

Parameters

General Parameters

Name

Default

Units

Description

Modelica ID

&Delta;Tsystem

0

K

Temperature offset from system temperature

dT_system

external leakage

true

 

If true, a small amount of oil leaks to the tank components

externalLeakage

use volume A

true

 

If true, a volume is present at port_A

useVolumeA

use volume B

true

 

If true, a volume is present at port_B

useVolumeB

Gext

10-13

m3sPa

Conductance of external leakage

Gext

Gint

5.·10-12

m3sPa

Conductance of the internal motor leakage

Gint

Dpump

10-4

m3

Displacement per revolution

Dpump

J

0.01

kgm2

Moment of inertia

J

td

0

 

Friction coefficient

td

εmechcoeff

1

 

Constant for mechanical efficiency

mechanicalEfficiencyCoefficient

Oil Parameters

Name

Default

Units

Description

Modelica ID

VA

10-6

m3

Geometric volume at port A

volumeA

VB

10-6

m3

Geometric volume at port B

volumeB

See Also

Id Var Pump, Pumps, MapleSim Hydraulics Library from Modelon Overview


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