Purpose of a Starter:
A starter is essential for DC motors to manage the high current drawn during startup. Since the rotor is stationary at initiation, there is no back EMF. Omitting a starter would lead to excessive current draw, potentially damaging the motor's windings and the power supply.
Starter Operation:
The starter is integrated in series with the armature winding.
Initially, the starter introduces significant resistance into the circuit, thereby curbing the starting current.
As the motor accelerates, the back EMF escalates, causing a reduction in current.
The starter's resistance is progressively decreased in stages until it is entirely bypassed, permitting full voltage to reach the armature.
This incremental reduction of resistance safeguards the motor and the electrical system from abrupt current surges.
Typical starter configurations include the Rheostat Starter and the Three-point Starter.