Speed sensor

Measures shaft speed without loading the mechanical system.

  • signal
  • rotational
  • Gradara equations
  • 2 ports
BlockSpeed sensorKindsensorLibraryRotational

Description

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

Example

Clutch, backlash, and rotational sources A clutch that locks, gear backlash, a spring-damper coupling, and a load that steps its torque.

100 rad/s at 0.1 sDriveClose at 0.5 sClutchDriven 1 kg·m²Driven speedω ref 10 sin 2πtSpeed sourceBacklash 0.1 radInertia 0.01Speed behind backlash0.5 N·mTorque sourceCouplingInertia 0.02, damping 0.05Coupled speed0.4 N·mShaft loadLoad speed
In Gradara, select a Speed sensor block and press F1, then choose Open example. It opens as a new model in My models, ready to run.

Also in this example:ConstantMechanical loadStepInertia & loadSine waveSpring-damperBacklashInertia (ideal)ClutchTorque sourceConstant torqueSpeed sourceSpeed sensor (ideal)

Ports

Outputs 1

  • outysignal · rad/s

    Angular velocity, in rad/s.

Conserving terminals 1

  • shaftflangerotational

    Measured flange. No torque is exchanged.

Equations

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

Implementation

The block’s Modelica model
y = der(flange.phi);
flange.tau = 0;

Assumptions and limitations

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

Used in

These larger examples use it too. Open them from Examples in the app.

  • Motor speed control

See also

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