Questions about 110 V motor

Discussion in 'General Electronics Chat' started by Uncle monkey, Jul 27, 2009.

  1. Uncle monkey

    Thread Starter New Member

    Jul 26, 2009
    I'm trying to fix the motor off of a Search Compressor for guy from work. It is missing one capacitor and the other is bad. I have seen in mtr book that there is a formula or ratio of run to start capacitors. I can't find in my book and wonder if someone with a better memory is here.
    Second question is that instead of a typical spring loaded centrifugal switch
    to turn off the start windings there is a spring loaded round disk on the shaft of the rotor. It presses against the contacts in the unenergized position. I dont' understand how this works since i don't see how rotation will cause this to move forward which is what it has to do to open the start circuit.
    Thanks in advance