induction motor
I took this motor out of a drier and want to run it.
It has 3 wires:
Yellow: connected to the capacitor
Brown: connected to the capacitor other end
Black: not connected to anything.
Capacitor is 8 uF
I measured:
Yellow to black measures 40 ohms
Brown to black measures 40 ohms
Yellow to brown measures 80 ohms
more photos here:
https://photos.app.goo.gl/m1w3zwpYSZrEr93KA
I tried connecting black to ground and yellow/brown to main and it short circuited my house
With the given information and discussion, I think the motor will operate with the following connection. The capacitor may not be needed. It the current in the start coil can be measured during start and it is relatively low with a capacitance value used for similar Hp motors, it might make sense to try a direct connection from the switch to the power line. There would be a risk of burning out the winding fairly quickly if it is designed for use with a capacitor.
Various electrical diagrams for washing machine are available on the internet. Some show motors that use a start winding with no capacitor and some show a capacitor. The extra centrifugal switch is shown on some as switching a function external to the motor. The extra contact on the starting centrifugal switch is shown as feeding power to an external function when the motor is up to speed.
If the centrifugal switch is OPEN when at rest, that's your problem. It should be CLOSED at rest and OPEN when at 80% speed.
When you stall and try to keep using a single phase capacitor-start motor, it slows down, then the centrifugal switch re-closes, putting the start winding and cap back into the circuit. But that winding is not designed to be used under load, neither is the centrifugal switch. You burned out the switch, maybe the winding insulation too.
Best Answer
That you can measure resistance to the black wire suggests that it isn't a ground connection (insulation resistance should be in the megohm range) plus the green/yellow wire visible in the background is likely the ground connection.
The cap-start arrangement (b) is very common in driers, since the centrifugal switch can be used to keep the motor running after being started with a push-button, but that doesn't seem to be the case here, the centrifugal switch isn't visible, is's a generally fairly large black switch block at one end of the motor housings. There's also another board visible with a relay on it. That would suggest that you've got a PSC motor (a) which only needs two connections to it. The resistance measurements suggest that black is the common, and the brown would be the live feed, though I'm not sure why there would be an additional wire on the yellow then. Sometimes these manufacturers do really cheesy tricks like powering the controls off one winding on a motor.