30-10-2012, 05:48 PM
SPEED CONTROL OF DC SHUNT MOTOR
SPEED CONTROL OF DC SHUNT MOTOR.docx (Size: 52.06 KB / Downloads: 22)
PRECAUTIONS:
1. Field Rheostat should be kept in the minimum resistance position at the time of starting and stopping the motor.
2. Armature Rheostat should be kept in the maximum resistance position at the time of starting and stopping the motor.
PROCEDURE:
1. Connections are made as per the circuit diagram.
2. After checking the maximum position of armature rheostat and minimum position of field rheostat, DPST switch is closed
(i) Armature Control:
1. Field current is fixed to various values and for each fixed value, by varying the armature rheostat, speed is noted for various voltages across the armature.
(ii) Field Control:
1. Armature voltage is fixed to various values and for each fixed value, by adjusting
the field rheostat, speed is noted for various field currents.
2. Bringing field rheostat to minimum position and armature rheostat to maximum
position DPST switch is opened.