08-05-2012, 04:24 PM
SPEED CONTROL OF DC SHUNT MOTOR
51355420-LAB-MANUAL-FOR-E-E-CS.pdf (Size: 523.09 KB / Downloads: 49)
PRECAUTION
• The motor field rheostat should be kept at minimum resistance position.
• The motor armature rheostat should be kept at maximum resistance position.
• The motor should be in no load condition throughout the experiment.
• The motor should be run in anticlockwise direction.
EC2259 Electrical Engineering And Control System Lab Manual
Prepared by G.Panneerselvam, Vel Tech Multi Tech
CIRCUIT DIAGRAM FOR SPEED CONTROL OF DC SHUNT MOTOR
Tabulation for Speed control of DC Shunt motor
Armature Control Method Field Control Method
EC2259 Electrical Engineering And Control System Lab Manual
Prepared by G.Panneerselvam, Vel Tech Multi Tech
Model Graph
(A) Armature Control Method: (B) Field Control Method:
PROCEDURE
Field Control Method (Flux Control Method)
• Connections are given as per the circuit diagram.
• Using the three point starter the motor is started to run.
• The armature rheostat is adjusted to run the motor at rated speed by means of
applying the rated voltage.
• The field rheostat is varied gradually and the corresponding field current and speed
are noted up to 120% of the rated speed by keeping the Armature current as
constant.
• The motor is switched off using the DPIC switch after bringing all the rheostats to
their initial position.
Armature Control Method (Voltage Control Method)
• Connections are given as per the circuit diagram.
• Using the three point starter the motor is started to run.
• The armature rheostat is adjusted to run the motor at rated speed by means of
applying the rated voltage.
• The armature rheostat is varied gradually and the corresponding armature voltage
armature current and speed are noted up to the rated voltage.
• The motor is switched off using the DPIC switch after bringing all the rheostats to
their initial position
GRAPH
The graph are drawn as
• Field current Vs Speed
• Armature current Vs Speed