Thread: Is a 3 phase motor that has been immersed in oil savable?

Agree with the other comments, aggressive solvents aren't a good idea on the enameled wire, especially if the motor isn't all that fresh. Maybe a watered down IPA mix but go easy on it and compressed air used gently to dry it out.

I'll use the kerosene as suggested and blow down with compressed air, maybe fan dry and some natural heat from the sun as well.

I've ordered the MH10 Megger so will wait for that to arrive so I can take some before and after readings.

VFD should be arriving soon as well.

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I did a review of a budget level Megger on the woodies forums in 2014
https://www.woodworkforums.com/f271/...-review-182461

've used it extensively on motors etc since I bought it and it's still working great.

So the MH10 megger has arrived.

When I am testing winding to winding
Ie u1 - u2, v1 - v2, w1 - w2 I am not getting a reading.

Ground - u1, v1, w1 it will read 2000m ohms. So that seems normal.

Why would I not be getting a reading when testing winding to winding?

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Hi Com_VC,

Your readings seem about right ! The actual individual windings are insulated from the metal frame and each other by the shellac on the wire and the cardboard or fibre insulation pocketing the windings. The only time that you will get a low resistance reading is across the ends of each individual winding. This is basically the resistance of the wire in the winding.

All other readings are the resistance value of the insulation, resistance to the metal frame and winding to winding assuming that both ends of the three windings are not connected to anything.

snapshot4.png

This is how your motor looks electrically.

HTH.

Thanks for that, sounds promising in that case.

I've just given it a good clean with kerosene and blown down with compressed air.

Will let it dry out and megger again over the weekend, then hopefully power it up with the vfd.

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Well just reporting that the motor is back together and running without any issues via the VFD.

Thanks again for all the help.

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