mo-ta モーター

October 4, 2006

How can I test an AC motor to see if it’s still good or if it’s been shorted?

Filed under: AC Gearmotors — mota @ 3:14 am

One way to do this is to measure the resistance in the windings.  If using a single phase motor, remove the capacitor and measure the resistance between the black and red leads.  Now measure between the black and white.  The two resistance values should be about the same.  This indicates that the motor is fine.  If either value is zero or close to zero, then the motor has been shorted.

For a 3 phase motor, measure between any 2 wires.  Measure all 3 combinations and compare.


Leave a Comment »

No comments yet.

RSS feed for comments on this post. TrackBack URI

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

Blog at

%d bloggers like this: