WOLFRAM SYSTEM MODELER

HydrostaticTransmission

Example circuit of a pump driving a motor

Diagram

Wolfram Language

In[1]:=
SystemModel["Hydraulic.Examples.Rotation.HydrostaticTransmission"]
Out[1]:=

Information

This model shows an example of how to model a hydrostatic transmission with an angular velocity feedback controlling a variable displacement pump. The system is protected by one pressure relief valve on each side. Additional oil is supplied to the system from the pressure sources through very small orifices.

Fig. 1 shows the desired motor speed and the actual motor speed. Fig. 2 shows how the pump displacement is used to control the motor speed.

hydrostaticTransmissionPlot1
Fig. 1 Motor speed and reference speed

hydrostaticTransmissionPlot2
Fig. 2 Pump displacement setting

Parameters (1)

medium

Value: Oil()

Type: Medium

Description: Medium in the component

Components (22)

medium

Type: Medium

Description: Medium in the component

constantSpeed

Type: ConstantSpeed

pressureReliefValve1

Type: PressureReliefValve

tank1

Type: Tank

tank2

Type: Tank

pressureReliefValve2

Type: PressureReliefValve

motor

Type: Motor

pump

Type: PumpVariable

volume1

Type: Volume

volume2

Type: Volume

tank3

Type: Tank

tank4

Type: Tank

speedSensor

Type: SpeedSensor

step

Type: Step

feedback

Type: Feedback

gain1

Type: Gain

gain2

Type: Gain

integrator

Type: Integrator

add1

Type: Add

firstOrder1

Type: FirstOrder

fixedLaminarThrottle1

Type: FixedLaminarThrottle

fixedLaminarThrottle2

Type: FixedLaminarThrottle