Caltric Stator-no coating on stator windings?

[duaneage]

A caltric stator failed in my 650 because the lacquer came off the windings. The oil shorted it. I measured the resistance with it dry on the bench and when I poured oil on it a short developed.

[Carter Turk]

Hmmm, so some fretting then?

[Sandy]

A caltric stator failed in my 650 because the lacquer came off the windings. The oil shorted it. I measured the resistance with it dry on the bench and when I poured oil on it a short developed.

Vibration chafed through the lacquer perhaps???

[duaneage]

Nope the coating came off easily. Looked like either the oil attacked it or the wire wasn't prepped before coating. I put an electrosport in because it had superior coating on the wire. The caltric wires were not extra dipped. It's in 220 degree oil so it needs protection.
All the other stuff about magnetic and vibrations didn't apply.

[duaneage]

The funny thing about the failure was when the bike sat for 4 days it would charge normally upon starting. As soon as enough oil worked it's way around it the charge went down. I knew it was a problem with insulation somewhere. I got 6 years out of my 80.00 so I was ok with it. Things happen.

[Evan]

So the stator does need a coating of this substance on it?

If so awesome! I think this may have just solved my charging issues. I didn't even think about it when I put my new stator in. I also bought the lower cost stator. It had good ratings and was comparable to the other stators I could find if not the exact same. It didn't have the coating so it is shorting and is not charging my bike. You guys are great! I have been stumped on this for a while...

[duaneage]

If you r3move and decrease with alcohol you might be able to revarnish it. You need to make it dry and clean. I opted for another with epoxy coating, electrosport.

[posplayr]

A caltric stator failed in my 650 because the lacquer came off the windings. The oil shorted it. I measured the resistance with it dry on the bench and when I poured oil on it a short developed.

Just to be clear, you measured resistance with a VOM? What was the resistance range if you recall?

[Gorminrider]

Huh? Motor oil is a good insulator.

The oil shorted it. I measured the resistance with it dry on the bench and when I poured oil on it a short developed.

This bench test is really odd but I'd expect it to be the weight of the oil making the short connect...the worn unvarnished crossed wires would be very nearly touching or touching in any case. Maybe the heat of the short might burn the oil leaving carbon and more as a buildup to conduct...?

[posplayr]

Huh? Motor oil is a good insulator. This bench test is really odd but I'd expect it to be the weight of the oil making the short connect...the worn unvarnished crossed wires would be very nearly touching or touching in any case. Maybe the heat of the short might burn the oil leaving carbon and more as a buildup to conduct...?

Perhaps another example of CCC; Confusing Correlation and Causation.

[duaneage]

Well that's how it behaved. The insulation was not sticking to the windings, probably due to poor prep on the wire or the lacquer was thin.

[Gorminrider]

Oh! for sure ! It seems an oddity is all so it invites speculation. I've tried to cut up old ones to find shorts as a curiousity but It's too crude to really see much beyond guessing.

[posplayr]

Oh! for sure ! It seems an oddity is all so it invites speculation. I've tried to cut up old ones to find shorts as a curiousity but It's too crude to really see much beyond guessing.

I would speculate that principles of physics is still involved