A split-phase AC motor's start winding is removed from the circuit how?

A split-phase AC motor's start winding is removed from the circuit how?

• A. Using a start relay
• B. With a capacitor
• C. By using a stator
• D. Using a centrifugal switch

Answer: (D)

A split-phase AC motor relies on both the main and start winding to create a rotating magnetic field that initiates motor operation. Once the motor reaches a specified speed, it is essential to disconnect the start winding from the circuit to prevent overheating and inefficiency. The centrifugal switch is designed specifically for this purpose. As the motor accelerates to its operating speed, centrifugal force activates the switch, mechanically disconnecting the start winding from the circuit. This ensures that the start winding is only engaged during the startup phase and is removed from the circuit thereafter, allowing the motor to run efficiently on the main winding only. Using a start relay or a capacitor is more common in capacitor-start motors rather than split-phase motors. A stator is a component of the motor but does not function in the disconnection of the start winding. The centrifugal switch ensures that the motor operates correctly and prevents potential damage from prolonged use of the start winding.

A split-phase AC motor relies on both the main and start winding to create a rotating magnetic field that initiates motor operation. Once the motor reaches a specified speed, it is essential to disconnect the start winding from the circuit to prevent overheating and inefficiency.

The centrifugal switch is designed specifically for this purpose. As the motor accelerates to its operating speed, centrifugal force activates the switch, mechanically disconnecting the start winding from the circuit. This ensures that the start winding is only engaged during the startup phase and is removed from the circuit thereafter, allowing the motor to run efficiently on the main winding only.

Using a start relay or a capacitor is more common in capacitor-start motors rather than split-phase motors. A stator is a component of the motor but does not function in the disconnection of the start winding. The centrifugal switch ensures that the motor operates correctly and prevents potential damage from prolonged use of the start winding.