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Topics - john11139

#1
General Discussion / Tempture of generator.???
November 21, 2012, 04:10:45 PM
I have a generator head I just had rewound.  With little or no load the gen head shows to be about 230 degreees.  The gen seems to have the proper voltage and out put under load.  I think this is too hot.  another gen I have runs about 160.  Any opinions. I am worried that under load for any length of time it might burn up the windings.
#2
Is there a web site or can any one give me any advice and information on hand winding a filed coil.  I have a Leroy-Somer 8.5 kw generator that has a burnt field coil.  No replacement part from Leroy-Somer.  Really dont want to replace it with a universal gen head.  What would I get into if I tried to hand wind it? Is it possible, any tips.  I took it to two electric motor rewinders and they said they couldnt do it.  I did drop it off at another rebuild shop in Cols. Oh. this morning.  The fellow who determines if they could do it or not and how much was not there today so I left it.  I am expecting the worst and may have to try and rewind it myself. I have seen some old timers do it but they are all gone to the great beyound.  I had one hand wind a 3hp air compressor motor for me over 30 years ago and it is still working better than new.
#3
Just purchased a 8.5 kw gen head, sight unseen, fellow swore on his mothers grave that it was working when taken off (engine blew)  I have not mounted it yet as it is very labor intensive to mount it on my engine. But upon examening it very closely, I find one of the field windings that I am questioning.  It looks like it is burnt some what and looks like the insulation is sort of flaked off in places. (other windings are ok.  Is there a way to check it to see if it is shorted?  I think the book says 0.33 ohms of resistance.  Would that little of resistance show up on a ohm meter?  If I decide to use it, should I coat the windings with varnish or shellac or purchase a can of spray on winding insulation, and coat it good??
#4
I puurchased a Coleman light plant with a Kubota D850 engine and a Leroy Somer gen head.  It is rated at 6kw. continous.  I was going to use it to replace my 6.K gas gen set.  My house hold load is some where around 3000 to 3500 wat.  Lights, Fans, frezer. ref.  Without intermitt a 3/4 well pump (220)  Got it hooked up and everything works great except it really (almost puts lights out) drops the voltage for a few seconds when the well pump kicks on.  With my gas gen it dropped some but not this much. (I think governor kicked in)  I  have a chance to purchase a 8.5 Kw Leroy Somer gen head. I know that you usually figure 2 hp per kw.  But if I dont put any more of a continous load than on the 6.kw, would this engine handle the 8.5 and would this help in starting my well pump?  I have heard that for the most efficent use of your engine 80% load is what you should have on it. I notice when I was testing the gen that after putting 3 1500watt heaters that it started pulling it down and the 4 one voltage started dropping.  I would say that about 4500 watt is the max productive point.