PSC Motor

Typical Wiring Diagram for a PSC Motor

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

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