DETERMINATION OF TRANSFER FUNCTION OF FIELD CONTROLLED DC SERVO MOTOR PATCHING DIAGRAM TO DETERMINE FIELD INDUCTANCE, LF - Computer Programming

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Monday, March 28, 2011

DETERMINATION OF TRANSFER FUNCTION OF FIELD CONTROLLED DC SERVO MOTOR PATCHING DIAGRAM TO DETERMINE FIELD INDUCTANCE, LF


Determination Of Transfer Function Of field CONTROLLED DC Servo Motor
PATCHING DIAGRAM TO DETERMINE FIELD INDUCTANCE, LF
PROCEDURE:

5. To determine moment of inertia J and frictional co-efficient B:
                       
  • Check whether the MCB is in OFF position in the DC servomotor trainer kit
  • Patch the circuit as per the patching diagram
  • Put the selection button of the trainer kit in the armature control mode and the DPDT switch in power circuit position.
  • Check the position of the potentiometer; let it initially be in minimum position.
  • Switch ON the MCB.
  • Vary the pot and adjust the motor to run at rated speed.
  • Note the values of armature current Ia, armature voltage Va, field current If, Speed N.
  • Change the DPDT switch position from power circuit side to load side, simultaneously noting the time taken t1 of the motor to come to rest from rated speed, using a stop watch.
  • Set the potentiometer to minimum position and change the DPDT switch to power circuit side
  • Connect a load of 500 Ohms in the load position
  • Vary the pot and adjust the motor to run at rated speed
  • Change the DPDT switch position from power circuit side to load side, simultaneously noting the time taken t2 of the motor to come to rest from rated speed, using a stop watch.
  • Find the values of moment of inertia J  and frictional co-efficient B using the above values

OBSERVATIONS:
S. No
Armature
 Voltage, Va
(V)
Armature
Current, Ia
(A)
Field
Current, If
(A)
Speed, N

(rpm)
t1
(secs)
t2
(secs)








CALCULATIONS:






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