What is the main purpose of a starter in electric motors?

The main purpose of a starter in electric motors is to reduce the initial high current during start-up. When an electric motor is powered on, it can draw a significant amount of current, known as inrush current, which can be several times higher than the normal operating current. This high initial current can lead to various issues such as damage to the motor, overheating, and potential disruption to the electrical supply network.

A starter mitigates these concerns by gradually increasing the voltage applied to the motor or using techniques like resistance or inductance to limit the current. This controlled start allows the motor to accelerate smoothly to its operating speed without the adverse effects of sudden high current draw, thereby ensuring longevity and reliable operation of the motor.

Other options relate to functions that aren't the primary role of a starter. For example, cutting off power during maintenance is a safety procedure that isn't the function of a starter itself. Boosting voltage during operation is not a starter's role, as starters are designed to control the start-up phase rather than increase voltage during steady-state operation. Lastly, ensuring a constant current supply is more relevant to the power supply's role rather than the starter because once the motor is running, the aim is to maintain a stable operating current instead of controlling the