Starting-DC-Rheostat
EEE
A Starting DC Rheostat is a variable resistor used to control the starting current of a DC motor and ensure a smooth and safe start. When a DC motor is first switched on, there is no back electromotive force (back EMF), which causes a very high current to flow through the armature. To prevent this excessive current, a rheostat is connected in series with the armature winding. At the beginning, the rheostat offers maximum resistance to limit the current. As the motor picks up speed and back EMF increases, the resistance is gradually reduced. When the motor reaches its normal operating speed, the resistance is completely removed from the circuit. In this way, a starting DC rheostat helps to limit the starting current, protect the motor from damage, and provide smooth acceleration during startup.
Tags: The term Starting-DC-Rheostat refers to a starting rheostat