Permanent Split Capacitor (PSC) Motor

The Permanent Split Capacitor motor also has a cage rotor and the two windings named as main and auxiliary windings similar to that of a Capacitor Start and Capacitor Start Capacitor Run Motor. It has only one capacitor connected in series with the starting winding. The capacitor C is permanently connected in the circuit both at the starting and the running conditions.

The connection diagram of a Permanent Split Capacitor Motor is shown below.

Permanent Split Capacitor Motor figure

It is also called as a Single Value Capacitor Motor. As the capacitor is always in the circuit and thus this type of motor does not contain any starting switch. The auxiliary winding is always there in the circuit.  Therefore, the motor operates as the balanced two-phase motor. The motor produces a uniform torque and has noise free operation.

Advantages of Permanent Split Capacitor Motor

The Single Value Capacitor Motor has following advantages.

  • No centrifugal switch is required.
  • Efficiency is high.
  • As the capacitor is connected permanently in the circuit, the power factor is high.
  • It has a higher pullout torque.

Limitations of Permanent Split Capacitor Motor

The limitations of the motor are as follows:-

  • The paper capacitor is used in the motor as an Electrolytic capacitor cannot be used for continuous running. The cost of the paper capacitor is higher, and size is also large as compared to the electrolytic capacitor of the same ratings.
  • It has low starting torque, less than full load torque.

Applications of Permanent Split Capacitor Motor

The various applications of the split motor are as follows:-

  • Used in fans and blowers in heaters and air conditioners.
  • Used in refrigerator compressors.
  • Used in office machinery.


  1. PETER MANES Reply

    Is a Permanent Split Capacitor Motor better and or safer for a bathroom fan motor than a Capacitor Start Capacitor Run Motor?

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