The single-phase Induction Motor (IM) which does not have centrifugal switch is?

Option 4 : permanent capacitor run single phase IM

• Single phase induction motor has a single cage rotor, and its stator has two windings known as main winding or running and starting winding or auxiliary winding
• Both the windings are displaced 90 degrees in space
• At the starting of the motor both the windings are connected in parallel
• As soon as the motor reaches the speed of about 70 to 80 % of the synchronous speed the starting winding is disconnected automatically from the supply mains
• If the motors are rated about 100 Watt or more, a centrifugal switch is used to disconnect the starting winding and for the smaller rating motors relay is used for the disconnecting of the winding
• In permanent capacitor run single phase induction motor, the starting capacitor will remain throughout the operation and hence there is no requirement of centrifugal switch