WOLFRAM SYSTEM MODELER

Limiter

Limit the range of a signal

Wolfram Language

In[1]:=
SystemModel["Modelica.Blocks.Nonlinear.Limiter"]
Out[1]:=

Information

This information is part of the Modelica Standard Library maintained by the Modelica Association.

The Limiter block passes its input signal as output signal as long as the input is within the specified upper and lower limits. If this is not the case, the corresponding limits are passed as output.

The parameter homotopyType in the Advanced tab specifies the simplified behaviour if homotopy-based initialization is used:

  • NoHomotopy: the actual expression with limits is used
  • Linear: a linear behaviour y = u is assumed (default option)
  • UpperLimit: it is assumed that the output is stuck at the upper limit u = uMax
  • LowerLimit: it is assumed that the output is stuck at the lower limit u = uMin

If it is known a priori in which region the input signal will be located, this option can help a lot by removing one strong nonlinearity from the initialization problem.

Parameters (4)

uMax

Value:

Type: Real

Description: Upper limits of input signals
uMin

Value: -uMax

Type: Real

Description: Lower limits of input signals
strict

Value: false

Type: Boolean

Description: = true, if strict limits with noEvent(..)
homotopyType

Value: Modelica.Blocks.Types.LimiterHomotopy.Linear

Type: LimiterHomotopy

Description: Simplified model for homotopy-based initialization

Connectors (2)

u

Type: RealInput

Description: Connector of Real input signal
y

Type: RealOutput

Description: Connector of Real output signal

Used in Examples (4)

SMPM_Braking

Modelica.Electrical.Machines.Examples.SynchronousMachines

Test example: PermanentMagnetSynchronousMachine acting as brake

DC_CompareCharacteristics

Modelica.Electrical.Machines.Examples.DCMachines

Test example: Compare torque-speed characteristic of DC motors

SMPM_Braking

Modelica.Magnetic.FundamentalWave.Examples.BasicMachines.SynchronousMachines

Test example: PermanentMagnetSynchronousMachine acting as brake

DrumBoiler

Modelica.Fluid.Examples.DrumBoiler

Complete drum boiler model, including evaporator and supplementary components

Used in Components (6)

LimPID

Modelica.Blocks.Continuous

P, PI, PD, and PID controller with limited output, anti-windup compensation, setpoint weighting and optional feed-forward

TotalHarmonicDistortion

Modelica.Blocks.Math

Output the total harmonic distortion (THD)

Bode

Modelica.ComplexBlocks.ComplexMath

Calculate quantities to plot Bode diagram

Signal2mPulse

Modelica.Electrical.PowerConverters.ACDC.Control

Generic control of 2*m pulse rectifiers

SignalPWM

Modelica.Electrical.PowerConverters.DCDC.Control

Generates a pulse width modulated (PWM) boolean fire signal

VoltageToAngle

Modelica.Electrical.PowerConverters.ACAC.Control

Reference voltage to firing angle converter