In a split-phase motor, which winding is removed before reaching full speed?

In a split-phase motor, which winding is removed before reaching full speed?

• A. Start (auxiliary) winding
• B. Run (main) winding
• C. Stator winding
• D. Rotor

Answer: (A)

In a split-phase motor, the start (auxiliary) winding is used only to get the rotor moving by creating a phase-shifted magnetic field. As the motor nears full speed, a centrifugal switch or similar starter device disconnects the start winding, and the motor continues to run on the run winding alone. This reduces unnecessary current and heat once the motor is up to speed. The rotor stays in the motor and isn’t removed, and the run winding remains energized to maintain operation. So the winding removed before reaching full speed is the start (auxiliary) winding.

In a split-phase motor, the start (auxiliary) winding is used only to get the rotor moving by creating a phase-shifted magnetic field. As the motor nears full speed, a centrifugal switch or similar starter device disconnects the start winding, and the motor continues to run on the run winding alone. This reduces unnecessary current and heat once the motor is up to speed. The rotor stays in the motor and isn’t removed, and the run winding remains energized to maintain operation. So the winding removed before reaching full speed is the start (auxiliary) winding.