I have a problem starting a scratch refrigerator motor. I plan to use it for an air compressor. The problem is: The motor had some components attached to it, but they were burnt. Directly to the motor there were 3 pins, so I supposed it was a three phase motor. Then, I bought a starter capacitor, supposing it was the way to run a three phase motor using one phase. I didn't know tre required capacitance, so I bought the first capacitor I found, and it was a 6 uF, 400VAC.
The motor doesn't start this way, and I know the motor is OK. Later, searching at the web, I found several ways to start a 3-phase motor, using some relay that plugs the capacitance only at start. I only remember from the original components attached to the motor that it had a plastic enclosure with something like a thick round button-cell battery. I assumed it was a capacitor, but the one I bought doesn't seem like that one at all, the new one is the typical cilinder 4 inches tall.
Maybe I need another start technique? Can I use any start technique I wish on every motor? Or is the kind of motor associated with the start device? In case I can use a capacitor, which capacitance should I use for a typical refrigerator motor???
Thanks in advance! Eduardo