Both torques and the resultant torque for sleeps between zero and +2. At standstill, s=1 and (2-s) =1.
numerically equal but, being oppositely directed produces no resultant torque. So there is no starting torque in a single-phase induction motor
In this motor, four leads are brought outside its housing; two from the main winding and two from the starting-winding circuit. These four leads are necessary for external reversing. As usual, internally, the starting winding is connected in series with the electrolytic capacitor and a centrifugal switch. The direction of rotation of the motor can be easily reversed externally by reversing the starting winding leads with respect to the running winding leads
It is so arranged that the phase difference between the currents in the two stator windings is very large. Hence the motor behaves like a two-phase motor. These two currents produce a revolving flux and hence make the motor self –starting.
numerically equal but, being oppositely directed produces no resultant torque. So there is no starting torque in a single-phase induction motor
In this motor, four leads are brought outside its housing; two from the main winding and two from the starting-winding circuit. These four leads are necessary for external reversing. As usual, internally, the starting winding is connected in series with the electrolytic capacitor and a centrifugal switch. The direction of rotation of the motor can be easily reversed externally by reversing the starting winding leads with respect to the running winding leads
It is so arranged that the phase difference between the currents in the two stator windings is very large. Hence the motor behaves like a two-phase motor. These two currents produce a revolving flux and hence make the motor self –starting.