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.

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