Issue with Adding a Temperature Sensor to DCPM Motor Model in OpenModelica

Question

I am a beginner to OpenModelica, and I'm trying to build a model of a DC Permanent Magnet (DCPM) motor to measure its temperature using a temperature sensor. My model is based entirely on the DCPM components from DCMachines.

I am trying to add a temperature sensor to a DC Permanent Magnet (DCPM) motor model in OpenModelica. The model already includes components like a speed sensor, inertia, PI controller, and others. However, I encounter an incompatible component error when attempting to integrate the temperature sensor with the motor.

I attempted to add the temperature sensor directly to the DCPM motor model using the available components in OpenModelica. I expected the sensor to connect to the thermal port of the motor, allowing it to measure the motor's temperature correctly. However, I received an error indicating that the components were incompatible.

Model Overview:

DC_PermanentMagnet Motor (motor): A DCPM motor with specified nominal voltage(24V), resistance (Ra = 0.5), and inductance (La = 0.01). The thermal port is enabled for thermal effects.
Speed Sensor (speedSensor): Measures the rotational speed of the motor.
Inertia (inertia): Represents the rotational inertia (J = 10) connected to the motor shaft.
PI Controller (PI): Proportional-Integral controller with gain (k = 1.5) and time constant (T = 0.05) to control the torque input.
Feedback Block (feedback1): Compares the speed reference signal with the actual motor speed.
Step Input (step): Provides a step voltage of 24V at 1 second for the speed reference.
Constant Voltage Source (constantVoltage): Supplies a constant 24V to the motor.
Torque Source (torque): Applies control torque to the motor shaft,derived from the PI controller.

Connections:

The step signal feeds into the feedback block, comparing it with the motor speed from the sensor.
The feedback error is fed into the PI controller, which controls the torque applied to the motor.
The motor's electrical and mechanical interfaces connect to the voltage source and the inertia block.

Snapshots: model issue with model

Model Code:

model modelmotor
    Modelica.Mechanics.Rotational.Sensors.SpeedSensor speedSensor annotation(
    Placement(transformation(origin = {360, 42}, extent = {{-14, -14}, {14, 14}})));
    Modelica.Electrical.Machines.BasicMachines.DCMachines.DC_PermanentMagnet motor(useSupport =
    false, useThermalPort = true, VaNominal = 24, Ra = 0.5, La = 0.01) annotation(
    Placement(transformation(origin = {128, 40}, extent = {{-10, -10}, {10, 10}})));
    Modelica.Blocks.Continuous.PI PI(T = 0.05, x(start = 0.0, fixed = true), k = 1.5, initType =
    Modelica.Blocks.Types.Init.InitialOutput) annotation(
    Placement(transformation(origin = {54, 40}, extent = {{-10, -10}, {10, 10}})));
    Modelica.Blocks.Math.Feedback feedback1 annotation(
    Placement(transformation(origin = {-20, 40}, extent = {{-10, -10}, {10, 10}})));
    Modelica.Blocks.Sources.Step step(height = 24, startTime = 1, offset = 0) annotation(
    Placement(transformation(origin = {-84, 42}, extent = {{-10, -10}, {10, 10}})));
    Modelica.Mechanics.Rotational.Components.Inertia inertia(J = 10) annotation(
    Placement(transformation(origin = {211, 41}, extent = {{-13, -13}, {13, 13}})));
    Modelica.Electrical.Analog.Sources.ConstantVoltage constantVoltage(V = 24) annotation(
    Placement(transformation(origin = {94, 72}, extent = {{-10, -10}, {10, 10}})));
    Modelica.Mechanics.Rotational.Sources.Torque torque annotation(
    Placement(transformation(origin = {95, -21}, extent = {{-11, -11}, {11, 11}})));
  equation
    connect(feedback1.y, PI.u) annotation(
    Line(points = {{-11, 40}, {42, 40}}, color = {0, 0, 127}));
    connect(step.y, feedback1.u1) annotation(
    Line(points = {{-72, 42}, {-28, 42}, {-28, 40}}, color = {0, 0, 127}));
    connect(inertia.flange_b, speedSensor.flange) annotation(
    Line(points = {{224, 41}, {224, 42}, {346, 42}}));
    connect(speedSensor.w, feedback1.u2) annotation(
    Line(points = {{376, 42}, {394, 42}, {394, -72}, {-20, -72}, {-20, 32}}, color = {0, 0,127}));
    connect(constantVoltage.p, motor.pin_ap) annotation(
    Line(points = {{84, 72}, {62, 72}, {62, 90}, {134, 90}, {134, 50}}, color = {0, 0, 255}));
    connect(PI.y, torque.tau) annotation(
    Line(points = {{66, 40}, {66, 39}, {82, 39}, {82, -21}}, color = {0, 0, 127}));
    connect(torque.flange, motor.flange) annotation(
    Line(points = {{106, -21}, {106, 0.5}, {138, 0.5}, {138, 40}}));
    connect(constantVoltage.n, motor.pin_an) annotation(
    Line(points = {{104, 72}, {122, 72}, {122, 50}}, color = {0, 0, 255}));
    connect(inertia.flange_a, motor.flange) annotation(
    Line(points = {{198, 41}, {198, 40}, {138, 40}}));
    annotation(
    Diagram(coordinateSystem(extent = {{-200, -100}, {400, 100}})),
    Icon(coordinateSystem(extent = {{-200, -100}, {400, 100}})),
    version = "",
    uses(Modelica(version = "4.0.0")));
    end modelmotor;

Request: Can anyone help identify the issue and guide me on how to add a temperature sensor to measure the motor's temperature?

Thank you!

Issue with Adding a Temperature Sensor to DCPM Motor Model in OpenModelica

Answers (1)

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