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o Due to these two fields producing opposing torques on rotor single phase IM is not 
self starting. 
 
 
 
 
o To produce starting torque, we introduce an auxiliary winding which is used at the time 
of start & is disconnected during the run stage. 
 
 
 
 
 
 
We generally design auxiliary winding such that phase difference is approximately 90 
between main winding & auxiliary winding currents. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Page 3


 
 
 
 
 
 
o Due to these two fields producing opposing torques on rotor single phase IM is not 
self starting. 
 
 
 
 
o To produce starting torque, we introduce an auxiliary winding which is used at the time 
of start & is disconnected during the run stage. 
 
 
 
 
 
 
We generally design auxiliary winding such that phase difference is approximately 90 
between main winding & auxiliary winding currents. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
o Capacitor  Start Motor 
 
 
 
 
 
 
 
o Capacitor Run Motor 
 
 
  
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