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Thread: drying a motor
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13th January 2014, 06:27 AM #1SENIOR MEMBER
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drying a motor
Hi guys,
as a fill in job I decided to clean the electric motor for the power hacksaw. I pulled it apart and cleaned the ends and the suds pump.
I am down to the windings now but am not sure if I should use the pressure washer and degreaser as the windings have oil in them.
The real problem is drying it later. I vaguely remember other members putting theirs in the oven although I may be wrong.
I'm not quite sure of the correct procedure.
Any help would be appreciated.
Phil
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13th January 2014 06:27 AM # ADSGoogle Adsense Advertisement
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13th January 2014, 09:55 AM #2
You might find this long winded but useful:
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13th January 2014, 10:13 AM #3
Hi Phil,
On a day like today, just leaving it in the sun would probably do.
Normal procedure is bake in a moderate oven with potatoes and carrots until golden brown, and serve with 3 phase 415 or 240 depending on taste.
Ray
PS. At the SIL's work when they do a rewind, it's a varnish dip first and then into the oven to bake
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13th January 2014, 10:21 AM #4Member
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13th January 2014, 10:56 AM #5Senior Member
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Leaving it in the sun works well or put it in the oven on VERY low heat ie 40°C or put it front of a fan for a few hours.
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13th January 2014, 11:00 AM #6SENIOR MEMBER
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Definitely needs to be dried. Water in the windings can cause a short circuit with expensive results. My 25HP air compressor motor is in the shop for a rewind ATM though that was apparently mechanical damage not water. The previous owner was a total idiot WRT maintenance etc, the amount of debris inside the housing had to be seen to be believed. A very expensive lesson in not inspecting it earlier- I'd moved the thing to its new home and I suspect that I disturbed something because 30 seconds or less after pushing the button there was a nice flame flash, lots of brown smoke and...... silence.
The only good part of it is, I now know without any doubt that the circuit breakers work as designed.
PDW
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13th January 2014, 11:53 AM #7Senior Member
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Phil, I would be inclined to use a bit of petrol, provided there is nothing in there that will be effected. Just do it outside and away from sparks, and it will dry very quickly. The insulation coating on the windings should be impervious to petrol, provided it is not in there too long. And it seems that most of the junk is in the main shell of the motor.
Regards,
John.
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13th January 2014, 12:44 PM #8.
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For stuff that might be too big or heavy go into a domestic oven I found a judiciously aimed hair drier set on low works pretty well.
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13th January 2014, 01:00 PM #9Philomath in training
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If you had a decent heat gun you could make up a box for the motor and just blow some air through. (Perhaps do some thing similar with fan heater)
Michael
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13th January 2014, 01:20 PM #10
Hi Michael,
That's exactly what I have for drying electronics, its a fan heater ( one of the ones with on/off temperature control ) mounted in a box, and drying rack.
When de-fluxing printed circuit boards, I use a water based flux remover (safe wash) , and rinse the boards in running water, then into the drying cabinet for a few hours, generally run at about 70C,
For a motor, I'd keep the temp down to 70 or 80C.. and leave it with air circulating for 4 or 5 hours. The pressure washer is bound to push water into small crevices and hard to get spots. So the longer the better.
Ideally you would then megger test the windings, but I don't think Phil has a megger?
Ray
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13th January 2014, 03:31 PM #11Senior Member
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I have used mineral turps because I'm to cheap to use the proper lectra clean spray and the internet told me it was more or less the same.... It worked fine. I would be a little reluctant to use water or a harsher solvent but they may well work ok, but I definetely wouldn't pressure wash it! You need to avoid anything that could damage the varnish either mechanically or chemically.
Anyway its a vented motor so I wouldn't be too hung up about getting it spotless... just wash the lumpy bits out and youre good.
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13th January 2014, 06:12 PM #12Philomath in training
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13th January 2014, 06:39 PM #13Pink 10EE owner
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I used mineral turps in my engine cleaning spray gun on my 10EE DC drive motor...
Then a bit of metho on top of that....
I used to use petrol a lot, but as I think it is carcinogenic (or the benzene they put in it is) I have moved onto mineral turps from Bunnings... Plus water based degreaser...Light red, the colour of choice for the discerning man.
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13th January 2014, 07:41 PM #14SENIOR MEMBER
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Wow, a plethora of answers.
It doesn't seem too difficult a job to do even with my limited ability. I put this work in the 'black magic' box of electrical work.
Changing the bearings in electric motors is easy but I have never had to clean windings...damn black magic!!
My plan of attack is to use my degreasing gun with turps and then degreaser (water based) then seeing as how I have a hot air gun (Michael ) I will use a box of some description and funnel the air through the windings.
Any holes in that?
I have chosen this path because I have all the necessary items at hand.
I would love to borrow the megger Ray but you would have to supply a bag of ability as well.
About the only thing I know about meggers is that electricians use them to test, well, something .
Phil
ps I'm blown away by the replies guys, many thanks.
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13th January 2014, 07:49 PM #15Senior Member
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40 degrees in Ballarat tomorrow Phil. Just clean her up and leave the sun do the rest while you are at work.
Hooroo
John.
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