Buildings.Fluid.Actuators.Motors

Information

Package Content

Name	Description
Examples	Collection of models that illustrate model use and test models
IdealMotor	Ideal motor model with hysteresis

Buildings.Fluid.Actuators.Motors.IdealMotor

Information

Note: This model can introduce state events which increase the computation time.

Parameters

Type	Name	Default	Description
Real	delta	0.05	Hysteresis
Time	tOpe	120	Opening time [s]
Time	tClo	tOpe	Closing time [s]
Real	y_start	0.5	Start position

Connectors

Type	Name	Description
input RealInput	u	Connector of Real input signal
output RealOutput	y	Connector of Real output signal

Modelica definition

model IdealMotor "Ideal motor model with hysteresis"
  extends Modelica.Blocks.Interfaces.SISO;

  parameter Real delta(min=0, max=0.5) = 0.05 "Hysteresis";
  parameter Modelica.SIunits.Time tOpe(min=0) = 120 "Opening time";
  parameter Modelica.SIunits.Time tClo(min=0) = tOpe "Closing time";
  parameter Real y_start(min=0, max=1) = 0.5 "Start position";

  Modelica.Blocks.Logical.Hysteresis uppHys(final uLow=0, uHigh=delta,
    final pre_y_start=false);
  Modelica.Blocks.Logical.Hysteresis lowHys(uLow=-delta, final uHigh=0,
    final pre_y_start=true) "Lower hysteresis";
  Modelica.Blocks.Logical.Switch uppSwi;
  Modelica.Blocks.Continuous.LimIntegrator int(
    final y_start=y_start,
    final k=1,
    outMax=1,
    outMin=0,
    initType=Modelica.Blocks.Types.Init.InitialState,
    limitsAtInit=true,
    y(stateSelect=StateSelect.always)) "Integrator for valve opening position";

protected 
  final Modelica.Blocks.Sources.Constant zer(final k=0) "Zero signal";
  Modelica.Blocks.Sources.Constant vOpe(final k=1/tOpe) "Opening speed";
  Modelica.Blocks.Sources.Constant vClo(final k=-1/tClo) "Closing speed";
  Modelica.Blocks.Logical.Switch lowSwi;
  Modelica.Blocks.Math.Add add;
  Modelica.Blocks.Math.Feedback feeBac "Feedback to compute position error";
equation 
  connect(zer.y, uppSwi.u3);
  connect(uppHys.y, uppSwi.u2);
  connect(vOpe.y, uppSwi.u1);
  connect(lowHys.y, lowSwi.u2);
  connect(vClo.y, lowSwi.u3);
  connect(zer.y, lowSwi.u1);
  connect(add.y, int.u);
  connect(uppSwi.y, add.u1);
  connect(u, feeBac.u1);
  connect(feeBac.y, uppHys.u);
  connect(feeBac.y, lowHys.u);
  connect(lowSwi.y, add.u2);
  connect(int.y, y);
  connect(int.y, feeBac.u2);
end IdealMotor;