Start winding cut in RPM ?

[Paulm]

At what speed does the start winding disconnect on a 120vac 1725rpm motor. Is the switch any good to leave on for low wind rpm (low current higher voltage) switching to high wind (high current lower voltage). Or just rip this thing off when cutting the rotor down for magnet mounting.

[baggo]

Hi Paul,

Depending on the type of induction motor, the centrifugal switch operates at between 75% and 100% of the rated speed so it probably won't be of much use as an output control. You could possibly modify it to operate at a lower speed and use it to control a relay to change three phase coils from star to delta but it may be difficult to set it to the exact speed required.

John

[Jerry]

Hi Paul

Your motor is a single phase motor. I would remove the start winding switch. I would wire the start windings to there own fullwave bridge rectifier. They will contribut another 50% in power + or minus some?

This also reduces cutin speed. PS as far as I know 3 phase motors don't have start windings?

                                JK TAS Jerry