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question about motors

O

Omegachi

Diamond Member
say you have a 3 phase motor, with leads a, b, and c. if one of the lead is shorted, is it possible to detect that the motor is shorted by just checking the resistance between the gound and any one of the leads?
 
Is it wye-connected (neutral line in center) or delta? If it were delta, you could if you knew the resistance of each phase... if it were wye (thus having a neutral, NOT ground connection), then no...
 
On all three phase motors that I have seen, the leads are all tied together. There are two ways to do this "shorting" - called "delta" and "wye". Picture here. Usually when I see shorts with these types of motors , I see them short to the casing or the stator. That's fairly easy to detect (check the resistance between the casing and/or stator and the winds). If the wires are shorting to themselves near where they enter the motor, it can be hard to detect and requires a pretty good ohmeter.
 
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