To conduct the speed control of dc shunt motor by using Armature and Field Control Method

Aim

To conduct the speed control of dc shunt motor by using following methods

1. Armature control method.
2. Field control method.

Apparatus Required:

Name plate details:-

Voltage - 220V

Current -12A

Speed - 1500

H.P-3.0

Circuit diagram:

Procedure:-

Armature control method:

1. Connect the circuit as per the circuit diagram.
2. Ensure that the motor armature rheostat should be in maximum resistance position.
3. Give the dc supply to the machine by closing the DPST switch and start the motor with the help of three point starter.
4. By decreasing the resistance of rheostat, note down the readings of armature voltage and speed of the shunt motor.
5. Repeat the step no.4 till rated speed is obtained.
6. Switch off the dc supply by opening the DPST switch

Field control method:

1. Connect the circuits as per the circuit diagram.
2. Ensure that the motor field rheostat should be in minimum resistance position.
3. Give the dc supply to the machine by closing the DPST switch and start the motor with the help of three point starter.
4. By increasing the resistance of field rheostat, note down the readings of field current and speed of the shunt motor.
5. Repeat the step no.4 till about 130% of rated speed is obtained.
6. Switch off the dc supply by opening the DPST switch

Tabular columns:

Armature control method:

Field control method:-

Model Graph:

Result:Speed can be controlled by Armature voltage and flux control methods.