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Monday, April 4, 2011

LOAD TEST ON DC SERIES MOTOR


LOAD TEST ON DC SERIES MOTOR

AIM:
To conduct load test on DC Series Motor and to find efficiency.

APPARATUS REQUIRED:
S.No.
Apparatus
Range
Type
Quantity
1
Ammeter
(0-20)A
MC
1
2
Voltmeter
(0-300)V
MC
1
3
Tachometer
(0-3000) rpm
Digital
1
4
Connecting Wires
2.5sq.mm.
Copper
Few




PRECAUTIONS:
  1. The motor should be started and stopped with load
  2. Brake drum should be cooled with water when it is under load.






PROCEDURE:
  1. Connections are made as per the circuit diagram.
  2. After checking the load condition, DPST switch is closed and starter resistance is gradually removed.
  3. For various loads, Voltmeter, Ammeter readings, speed and spring balance readings are noted.
  4. After bringing the load to initial position, DPST switch is opened.



TABULAR COLUMN:

S.No.
Voltage
V
(Volts)
Current
I
(Amps)
Spring Balance Reading
(S1~ S2)Kg
Speed
N
(rpm)
Torque
T
(Nm)
Output Power
Pm
(Watts)
Input
Power
Pi
(Watts)
Efficiency
h%
S1(Kg)
S2(Kg)












































FORMULAE:
                       
        Circumference
 R        =     -------------------     m
                        100 x2p
Torque T = (S1 ~ S2) x R x 9.81 Nm

Input Power Pi = VI Watts

                                    2pNT
Output Power Pm =  ------------  Watts
                                       60

                                    Output Power
Efficiency h %     =  -------------------- x 100%
Input Power








MODEL GRAPH:



 













RESULT:
Thus load test on DC series motor is conducted and its efficiency is determined.

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