Power sensor (rotational)

Power flowing from flange a to flange b.

  • signal
  • rotational
  • Modelica Standard Library
  • 3 ports
BlockPower sensor (rotational)KindrotPowerSensorLibraryRotational

Description

Measures the mechanical power passing through it, from flange a to flange b. The flanges are rigidly joined.

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 Power sensor (rotational) 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 stepSpeed sensor (ideal)Acceleration sensorRelative speed sensor

Ports

Outputs 1

  • Ppowersignal · W

    Power, in watts. Positive when power flows in at flange_a and out at flange_b.

Conserving terminals 2

  • aflange_arotational

    Flange a.

  • bflange_brotational

    Flange b, at the same angle as flange_a.

Equations

Modelica
flange_a.phi = flange_b.phi
flange_a.tau + flange_b.tau = 0
power = flange_a.tau · d(flange_a.phi)/dt

Implementation

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

See also

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