To conduct the direct load test on the given single phase induction motor and to determine and plot its performance characteristics.

Aim

To conduct the direct load test on the given single phase induction motor and to determine and plot its performance characteristics.

Apparatus Required:

Name plate details:-

1Ф Induction motor

Rated Voltage : ________220V____________

Rated Current : ______8A______________

Rated Speed : _______1500rpm_____________

Rated Power : ________2HP____________

Rated Frequency: ______50Hz_____________

Formula used:

Torque= 9.81 × (S1-S2) × R Nm, where R is the radius of the brake drum in meter.

Output power, Po= 2πNT/60 Watts

Input power, Pi = W1+W2 Watts

%Efficiency, %η = (output power/input power) ×100

% Slip = (Ns-N)/N ×100

Power factor = Cos φ=W/VI

Circuit Diagram:

Procedure:

1. Connections are given as per the circuit diagram.
2. Switch on the supply at no load condition.
3. Apply the rotor voltage to the motor using the variac and note down the readings at ammeter And wattmeter.
4. Vary the load in suitable steps and note down all the meter readings till fill load condition.

Tabular column:

Model Graph:

Result:Thus load test on the single phase induction motor has been conducted and its performance characteristics determined.

Viva Questions:

1. What is the purpose of this experiment?
2. Whether single phase induction motor self starting motor?
3. What are the starting methods of single phase induction motor?