Torque sensor

Measures shaft torque without adding stiffness.

  • signal
  • rotational
  • Gradara equations
  • 3 ports
BlockTorque sensorKindtorqueSensorLibraryRotational

Description

Measures the torque transmitted through it, from flange a to flange b. The two flanges are rigidly joined, so the sensor adds no stiffness or inertia.

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 Torque 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:Fixed (rotational)Torsion springTorsion damperInertia (ideal)Ideal gearTorque stepSpeed sensor (ideal)Acceleration sensorPower sensor (rotational)Relative speed sensor

Ports

Outputs 1

  • τysignal · N·m

    Torque at flange a, in N·m. Positive when torque flows into the sensor at a.

Conserving terminals 2

  • arotational

    Flange a.

  • brotational

    Flange b, at the same angle as a.

Equations

Modelica
a.phi = b.phi
a.tau + b.tau = 0
y = a.tau

Assumptions and limitations

  • Ideal: no compliance, noise, or bandwidth limit.

See also

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