To conduct Brake test on dc shunt motor and to draw the performance curves of the motor

Aim

To conduct Brake test on dc shunt motor and to draw the performance curves of the motor

Apparatus Required:

Name plate details:-

Voltage - 220V

Current -12A

Speed - 1500

Excitation type - shunt

Circuit diagram:

Procedure:-

1. Make the connections as per the circuit diagram
2. Initially keep the motor field rheostat in minimum resistance position.
3. Give the supply by closing DPST switch and start the motor with the help of 3- point starter.
4. Adjust the motor field rheostat till the rated speed is obtained.
5. Apply the load on brake drum in steps.
6. Note down the readings of speed, voltmeter, ammeter and spring balance.
7. Repeat step 5 and 6 until rated current is obtained.
8. Remove the load on the motor before switching off the supply.

Tabular columns:

Model Graph:Draw the graph between output power on x-axis and speed , torque, efficiency & load current are on y-axis as shown below.

Result: Brake test is conducted on dc shunt motor and hence performance curves are plotted.

Viva voce

1. Define Torque?
2. What is the need of starter?
3. What are the types of starters?
4. Can we conduct Brake test on series motor?