Construction
and Working of Eddy current dynamometer
Sketch represents
working principle of this transmission type dynamometer, to measure torque and
hence power output of an engine.
It consists of rotor disc made of steel or
copper. The rotor shaft is supported in bearings and it is coupled to engine
shaft.
Stator is fitted with number of electromagnets
and the stator cradles in the trunion bearings. When rotor rotates, it produces
eddy currents in the stator due to magnetic flux by passage of field current in
the electromagnets. These currents oppose the rotor motion, thus loading the
engine.
The torque is measured with the help of torque
arm.
This dynamometer requires some cooling
arrangement since the eddy current generate heat.
This dynamometer is compact and versatile; as
it can measure high power output at all speeds. These are used to test automobile and
aircraft engines.
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