Capacitor Start and Run Induction Motor

 Capacitor Start and Run Motor

• It consists of starting winding and running winding. 
• The starting winding is connected is in series with capacitor and there is no centrifugal switch it means that the capacitor is permanently connected in the circuit. 
• As the capacitor is permanently connected it is also called as Permanent split capacitor run motor. 
• As the capacitor is used during starting and running condition neither optimum starting nor running performance is achieved. 
• The rating of the capacitor is in the range of 2 to 20 µF and it is oil or paper foil type continuous duty type capacitor. 
• If the rating of the capacitor is selected in the low range, very low starting torque is achieved.  
• It is practically behaves like unbalance two phase motor.

Function of the capacitor

• Improve power factor
• Improved efficiency
• Quieter operation
• Improved overload capacity

Application

As the starting torque is very low it is used in the

• Fans
• Blowers
• Voltage regulator circuit
• Oil burners

Forward – Reverse rotation

• If the starting and running winding is identical, the forward and reverse rotation of the motor is possible by connecting external forward – reverse switch.

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