How do primary resistance starter works?

Primary resistance starters work by controlling the voltage applied to an electric motor during startup. They utilize resistors or rheostats to limit the current flowing to the motor, reducing the initial torque and preventing damage from sudden inrush currents. Once the motor reaches a certain speed, the resistance is gradually removed, allowing full voltage to be applied for normal operation. This method is commonly used in larger motors to enhance their lifespan and efficiency during the startup phase.