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

*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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