Stator layers need to be insulated? Dents in stator.
#1
Stator layers need to be insulated? Dents in stator.
OK so some of the chewed up gear teeth from my stater fail( https://www.kawasakiforums.com/forum...e-cases-39378/ )must have been caught between the stator and the flywheel and impacted the stator, denting it. I don't know anything about how these things work, so I'm asking you guys.
A couple of the "dents" look like they have tied together at least a few of the layers of the stator. My question is do these layers need to be insulated from each other? I plan on cleaning up these dents but would like to know how critical it is to keep the plates separated.
Thanks Dan.
A couple of the "dents" look like they have tied together at least a few of the layers of the stator. My question is do these layers need to be insulated from each other? I plan on cleaning up these dents but would like to know how critical it is to keep the plates separated.
Thanks Dan.
Last edited by dan888; 02-03-2013 at 09:26 PM.
#2
Strictly speaking, yes. The laminations need to be insulated from each other to prevent eddy currents and excess heat production. Now back in the real world a couple of little dings here and there shouldn't make a HUGE difference and may not make a noticeable difference at all. It's not ideal, but it may not really matter that much either.
#3
Ha ha , so cool I get a quick answer from opposite side of the world!!
Thanks DarkAngel I'm assuming that the outside diameter of the stator is somewhat critical. Probably not a good idea to file down through the dents to get to a point where the plates are still separated?
Dan
Thanks DarkAngel I'm assuming that the outside diameter of the stator is somewhat critical. Probably not a good idea to file down through the dents to get to a point where the plates are still separated?
Dan
#4
I believe the insulation is essential. My Honda 919's charging system quit generating electricity when a little cast aluminum nub in the engine case which was making contact with the stator eventually wore through the insulation after 40,000 otherwise trouble-free kilometers.
#5
Ha ha , so cool I get a quick answer from opposite side of the world!!
Thanks DarkAngel I'm assuming that the outside diameter of the stator is somewhat critical. Probably not a good idea to file down through the dents to get to a point where the plates are still separated?
Dan
Thanks DarkAngel I'm assuming that the outside diameter of the stator is somewhat critical. Probably not a good idea to file down through the dents to get to a point where the plates are still separated?
Dan
I believe the insulation is essential. My Honda 919's charging system quit generating electricity when a little cast aluminum nub in the engine case which was making contact with the stator eventually wore through the insulation after 40,000 otherwise trouble-free kilometers.
#6
The laminations are insulated from each other to prevent losses, but it will still work. Clean it up just enoght to seperate the laminatons. I'd be more concerned you have a short in the windings. Look for cracks in the magnet wire insulation coating. An internal ding like that will short it out.
#7
In your case, assuming there was no other damage, you should have been able to clean the area up and replace the insulating varnish. *You can get it in spray cans or if you find a motor rewinder you should be able to get them to re-varnish the whole thing and get it baked properly as well.
In my case unfortunately I was 1500km (~1000mi) from home and at the mercy of the repair shop which just ordered a new stator from Honda and installed it after grinding the nub down.
#8
Thanks for all the replies. I cleaned up the grooves between the plates as well as I could. I wasn't having any electrical problems, that I knew of, before the starter gears let go, so I'm going to pop it back in and see what I get. I do see some cracks on the outside of the thick insulation layer,but not necessarily any on just the wire insulation itself.
Dan
Dan
Last edited by dan888; 02-04-2013 at 01:01 AM.