Re: (ET) Nope, that wasn't it...

[Anton Berteaux <krustyacres earthlink net>]

Isn't it significant that the two outer ones make each other turn? How 
are the motors wired, series or parallel? What voltage are they? Are 
they shunt wound? Is the shunt not being powered? What happens if you 
power up one motor individually? Why is there air?
anton
On Apr 8, 2004, at 7:21 PM, Chris Zach wrote:

> *nod* Given that the thermo switch is protecting the motors, my guess 
> is the brushes swelled and stuck when I applied full power to the 
> motor by bypassing the breaker.
>
> Which makes the root question: "What caused this" even more of a 
> mystery. What would cause an armature to short simply by sitting in a 
> shed?
>
> Chris
>
>
> RJ Kanary wrote:
>
> >    Sounds like time to go to an auto- electric shop that has a 
> > growler, and
> > find out if the armatures are dead. You could have a chicken/ egg 
> > situation
> > here.
> >     Did the brushes stick in the guides because of excessive current 
> > draw
> > due to shorted windings , or was the commutator overheated and 
> > damaged due
> > to poor brush contact, due to the scenario that I have observed, 
> > mentioned
> > in my previous post ?
> > ----- Original Message ----- From: "Chris Zach" <czach computer org>
> > To: "Elec-trak list" <elec-trak cosmos phy tufts edu>
> > Sent: Thursday, April 08, 2004 9:19 PM
> > Subject: (ET) Nope, that wasn't it...
> > > Fired up the motor. Starts, then stops. try to bypass the thermo 
> > > switch
> > > and you get a set of sparks that will burn the end of your 
> > > screwdriver
> > > off...
> > >
> > > Not the brushes; they are clear. What the heck could cause this? Any 
> > > why
> > > on two of the three motors? Could the windings have just gone bad at
> > > once? Anyone have this happen?
> > >
> > > Chris
> > >
> > >
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