Speed sensor (ideal)

Absolute angular velocity of the flange.

  • signal
  • rotational
  • Modelica Standard Library
  • 2 ports
BlockSpeed sensor (ideal)KindrotSpeedSensorLibraryRotational

Description

Measures the absolute angular velocity of the flange without loading it.

Example

Rotational drivetrain A torque step drives a motor inertia through a 2:1 gear and a shaft spring into a damped load, with every rotational sensor.

Torque 1 N·mMotor 0.01 kg·m²Gear 2:1Shaft powerShaft torqueShaft 1000 N·m/radLoad 0.04 kg·m²Friction 0.1FrameMotor accelerationShaft twist rateLoad speed
In Gradara, select a Speed sensor (ideal) block and press F1, then choose Open example. It opens as a new model in My models, ready to run.

Also in this example:Torque sensorFixed (rotational)Torsion springTorsion damperInertia (ideal)Ideal gearTorque stepAcceleration sensorPower sensor (rotational)Relative speed sensor

Ports

Outputs 1

  • ωwsignal · rad/s

    Angular velocity, in rad/s.

Conserving terminals 1

  • shaftflangerotational

    Measured flange. No torque is exchanged.

Equations

Modelica
w = d(flange.phi)/dt
flange.tau = 0

Implementation

Modelica Standard Library 4.1.0Modelica.Mechanics.Rotational.Sensors.SpeedSensor
MSL documentation

Assumptions and limitations

  • Ideal: no noise, delay, or resolution limit.

See also

Select a block in Gradara and press F1 to open its page offline.