psc

PSC Motor


PSC Motor

PSC Motor


PSC Motor

Typical Wiring Diagram for a PSC Motor


Typical Wiring Diagram for a PSC Motor

Definition and Characteristics

  • PSC means Permanent Split Capacitor
  • Run-capacitor permanently connected in series with the start winding
  • Run cap makes the start winding an auxiliary winding once the motor reaches running speed
  • Does not have a start capacitor
  • Because the run capacitor must be designed for continuous use, it cannot provide the starting boost of a starting capacitor
  • Typical starting torques of PSC motors are as low as 30% of rated load, so these motors are not for hard-to-start applications
  • Unlike split-phase motors, PSC motors have low starting currents, usually less than 200% of rated load current, making them excellent for applications with high cycle rates
  • Need no starting mechanism and so can be reversed easily
  • Designs can be easily altered for use with speed controllers
  • Can be designed for optimum efficiency and high power factor at rated load
  • Considered to be the most reliable of the single phase motors, mostly because no starting switch is needed

Applications

  • Fans and blowers with low starting torque needs
  • Intermittent cycling uses such as adjusting mechanisms, gate operators and garage door openers
  • Uses which also need instant reversing

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