A true statement about split-phase motors is that the start winding is used only during acceleration.

A true statement about split-phase motors is that the start winding is used only during acceleration.

• A. True
• B. False
• C. Sometimes
• D. Not sure

Answer: (A)

In a split-phase induction motor, the start winding is there to create a phase-shifted current that produces a starting torque. This winding is energized (often through a capacitor or resistor) only long enough to get the rotor moving. Once the rotor reaches a sufficient speed, a centrifugal switch or electronic relay disconnects the start winding. With the start winding out of the circuit, the motor continues to run on the main winding alone. That means the start winding is used primarily during acceleration, which is why the statement is true for the common split-phase arrangement. There are other motor types, like permanent-split capacitor motors, where the start winding remains in circuit during running, but those are different designs and not the typical split-phase setup.

In a split-phase induction motor, the start winding is there to create a phase-shifted current that produces a starting torque. This winding is energized (often through a capacitor or resistor) only long enough to get the rotor moving. Once the rotor reaches a sufficient speed, a centrifugal switch or electronic relay disconnects the start winding. With the start winding out of the circuit, the motor continues to run on the main winding alone.

That means the start winding is used primarily during acceleration, which is why the statement is true for the common split-phase arrangement. There are other motor types, like permanent-split capacitor motors, where the start winding remains in circuit during running, but those are different designs and not the typical split-phase setup.