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MapleSim Hydraulics Library from Modelon

Prop Solenoid  Proportional solenoid as spool actuator with second-order dynamics

The Prop Solenoid component describes an actuator for a proportional valve with second-order spool dynamics and nonlinearities. It uses the same model for the actuator as the valve model Prop Valve.

The position of the spool is modeled as a second-order system with natural frequency ω0, damping damp, limits for the velocity, and hysteresis for the position.

Input signal: command (of type Real)

Output signal: position (of type Real)

The steady state value of the position is given by:

Command signal

Steady state position

command1

position=1

1<command < 1

1<position < 1

1command

position&equals;1

 

This component accepts positive or negative input signals to give positive or negative positions. Typical solenoids displace their armature only in one direction, requiring two solenoids to build this kind of actuation system.

Connections

Name

Description

Modelica ID

position

Position of spool

position

command

Commanded position of spool

command

Parameters

Name

Default

Units

Description

Modelica ID

ω0

500

rads

Natural frequency of spool

omega0

damp

710

 

Damping coefficient of spool

damp

hyst

0.05

 

Half of hysteresis width

hyst

vmax

25

 

Max. spool velocity [1/s]

vmax

Constants

Name

Value

Units

Description

Modelica ID

Plus

1

 

 

Plus

Null

0

 

 

Null_

Minus

1

 

 

Minus

See Also

DirectionalControl, Prop Valve, MapleSim Hydraulics Library from Modelon Overview


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