WOLFRAM SYSTEM MODELER
    RelSpeedSensorIdeal sensor to measure the relative angular velocity between two flanges  | 
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SystemModel["Modelica.Mechanics.Rotational.Sensors.RelSpeedSensor"]

This information is part of the Modelica Standard Library maintained by the Modelica Association.
Measures the relative angular velocity w_rel between two flanges in an ideal way and provides the result as output signal w_rel (to be further processed with blocks of the Modelica.Blocks library).
| flange_a | 
         Type: Flange_a Description: Left flange of shaft  | 
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|---|---|---|
| flange_b | 
         Type: Flange_b Description: Right flange of shaft  | 
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| w_rel | 
         Type: RealOutput Description: Relative angular velocity between two flanges (= der(flange_b.phi) - der(flange_a.phi)) as output signal  | 
    
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         Modelica.Electrical.Machines.Sensors Mechanical power = torque x speed  |