A radiator fan is used on diesel electric locomotives
to bring down the temperature of the diesel
engine cooling water. Drive between the engine
and radiator fan consists of an Eddy Current Clutch
type DR54/01AZ which controls the fan speed and
gear box with gear ratio 1:1.312, which provides
mechanical coupling between clutch and fan.
The Eddy Current Clutch is provided with an
outer rotor which is coupled to diesel engine and
an inner rotor which is coupled to the horizontal
shaft of the gear box. The non-coupled ends of
both the rotors are supported on two taper roller
bearings and lubrication to the gears and bearings
is provided form the oil filled in the gear box. The
inside surface of the outer rotor is brazed with a
copper liner. On the inner rotor, the exciting coil is
interposed between two slottes discs. The exciting
coil is connected to the slip ring assembly which is
also mounted on the inner rotor shaft. When the
exciting coil is excited the iteraction of the main
magnetic flux and the flux produced due to eddy
currents induced in the copper liner prodcues the
driving torque. The current to the coil is supplied
by means of four radial brushes mounted on the
two slip rings. |
