Which type of starting method is NOT involved with reducing voltage temporarily during motor startup?

Direct-on-line starting involves connecting the motor directly to the full supply voltage at startup. This method provides the motor with its rated voltage immediately, resulting in full starting torque. It does not incorporate any mechanisms for reducing voltage during the startup phase, which reflects its simplicity and the faster ramp-up to operational speed.

In contrast, other starting methods intentionally reduce the voltage to limit inrush current and torque during startup, which helps prevent mechanical stress on the motor and connected load. For instance, soft-start devices gradually increase the voltage and thus the motor speed, while part-winding and primary resistor methods also implement temporary voltage reduction strategies. Therefore, direct-on-line starting stands out as the method that does not involve this voltage reduction technique.