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Originally Posted by
sawmilleng
Wade,
If these motors you have are just "standard" 3 phase motors as used everywhere in industry:
You might also consider upgrading them a bit by pulling the end bells and rotor so that the portion with the copper windings has less steel attached to it. The end bells usually come off with about 4 bolts so it could be very quick to open them up. If they are standard motors there isn't any copper on the rotors--just aluminum.
Selling just the stator as copper bearing gives both you and the yard a better idea of the actual copper in the load, since it is visible. It should make it easier to negotiate a price.
This also gives you a chance to have a look at the windings. Some motors have a lot of the windings hanging out at each end of the stator and they can be fairly easily whacked off with a gas powered demolition saw with a cutoff disk in it. Usually it isn't worth trying to punch the windings out of the stator because they are glued in place with heavy varnish and need to be burnt out.
I've cut the wires off some stators which yielded 40 lbs of copper per end--80 lbs per stator.
Some of the aluminum on the rotor is easily bashed off with a BFH.
As always with scrap, if the motors are usable and a fairly modern design, they could be resold for more than scrap.
Good luck, and let us know how you make out with this!!
Jon.
the biggest part of these motors are the sealed type,,they seem to be pressed together....there are not any yards i know of that have a copper bearing material price,,i had never even heard that phrase until i found this forum,,,,so i would not get any more for a stator than i would the whole motor,,,,,,
these reasons are why i have ask this question on here,,its very rare i get A large quantity of something like this.....with the weight i have i will have to travel with this load, i will not be selling them for 10 cents a pound....
most of these motors are US ELECTRICAL MOTOR COMPANY 50 to 100 horse power 3 phase electrical motors the most common model is R319.....this particular motor weighs about 700 to 800 pounds.....if i thought there was a chance there was 40 or 50 pounds of copper in one i would strip them....ive never dealt in electric motors this size.....i have looked everywhere i can think of on the internet trying to find the copper weight of them ,,i havnt had any luck though
do you really think they could have 40 pounds of copper in them ?? i am not doubting you, i just never thought there would be near that amount in one....
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