Power Factor of Single Phase Motors?

The power factor of all motors varies with the mechancial load applied to them.

Power factor depends on type of load....what type of load you are is it is inductive or capactive ?

or is it a lighting load.

hope you get the soloution.

Power factor of generator depends on type of load. For motor there is no inductive load or capacitive load. Motor will have mechanical load. Power factor of motor may vary depending on amount of its mechanical load. Under full load conditions power factor will depend on its design parameters and whether it is capacitor run (if yes the capacitance value).

You know of a 3 phase motor with a PF of .95 without correction? That would be a VERY popular motor!

In general, single phase motors have capacitors in them. Cap-Start / Cap-Run and PSC (Permanent Split Capacitor) motors have caps in the circuit all the time, so they tend t have better PF than 3 phase motors of equivalent power. ButCap-Start/ Induction-Run do not leave the caps in the circuit and Split-Phase or Shaded Pole single phase motors never did, so therefore they are just as bad as 3 phase motors WRT power factor.

All the answers are right with JRaef as the best.

The key thing to know is that a 3 phase motor is pretty much 3 single phase motors (on three power supplies) from a simple theoretical view point.

The big difference is when it comes to starting because capacitors and inductors have to be used (can be left in) to make the field in a single phase motor look like it is rotating and not simply pulsing in relation to the rotor.