What component is added in series with a motor to limit the current during startup?

Adding starting resistance in series with a motor during startup is a common practice used to limit the initial inrush current that can be excessively high when the motor is first energized. When a motor starts, it typically operates at a low impedance, leading to a significant amount of current flow, potentially causing damage or tripping circuit protectors.

The starting resistance increases the overall resistance in the circuit, which reduces the current flowing through the motor at startup. As the motor accelerates and reaches its operational speed, this resistance can be gradually removed from the circuit, allowing the motor to operate at its rated current and torque.

This method is particularly useful in applications where controlling the startup current is crucial for equipment longevity and operational safety. Other components mentioned, such as slip rings, transformers, and the stator, don’t serve this specific purpose of controlling the startup current.