LOAD TEST ON DC SERIES MOTOR - Computer Programming

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## Monday, April 4, 2011

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.
4. After bringing the load to initial position, DPST switch is opened.

TABULAR COLUMN:

 S.No. VoltageV (Volts) Current I(Amps) Spring Balance Reading (S1~ S2)Kg SpeedN(rpm) TorqueT(Nm) Output PowerPm (Watts) InputPowerPi (Watts) Efficiencyh% 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.