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:


the motor I tried connecting black to ground and yellow/brown to main and it short circuited my house

  • \$\begingroup\$ Look up the wiring in google images for an induction motor and start/run cap google.com/search?q=induction+motor+and+start/… \$\endgroup\$ – Tony Stewart EE75 Sep 19 '18 at 11:45
  • \$\begingroup\$ Please draw a circuit diagram. \$\endgroup\$ – winny Sep 19 '18 at 12:01
  • \$\begingroup\$ 120V60Hz or 230V50Hz? \$\endgroup\$ – Tony Stewart EE75 Sep 19 '18 at 12:49
  • \$\begingroup\$ Did you make notes to record where the wires were connected inside the drier? Is there a circuit diagram on the back of the drier? Did the motor work when the drier was taken out of service? When you say you connected yellow/brown to main do you mean you connected both at the same time? Did you connect black to earth or neutral? \$\endgroup\$ – Charles Cowie Sep 19 '18 at 13:04
  • \$\begingroup\$ @TonyEErocketscientistn 230v/50hz \$\endgroup\$ – Eli Konky Sep 19 '18 at 13:54

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. motor caps

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.

  • \$\begingroup\$ there is no centrifugal switch in this motor. \$\endgroup\$ – Eli Konky Oct 11 '18 at 8:51

After going through a lot of googling and forums it seems this is motor is one the most simple ac motors out there. No centrifugal switch, just 2 coils. The black wire IS NOT GROUND!! to run the motor I attached the black wire to one of either brown or yellow wires.


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