1. Minimum Rheostat Position: When the rheostat is at the minimum position, the resistance in the armature circuit is the highest. This means that the armature current is lowest, resulting in a weak magnetic field. The motor has a low starting torque and runs at a slow speed.
2. Increasing Rheostat Position: As the rheostat position is gradually increased, the resistance in the armature circuit decreases. The armature current increases, leading to a stronger magnetic field. The motor begins to develop more torque and spin faster.
3. Maximum Rheostat Position: When the rheostat reaches the maximum position, the resistance in the armature circuit is the lowest. The armature current is the highest, and the motor operates at its maximum speed and torque.
By controlling the rheostat position, you can regulate the speed of the motor, allowing it to meet specific requirements for various applications.
