Re: (ET) Broke another motor

["Konstanty, Walter (GE Indust, ConsInd)" <Walter Konstanty ge com>]

Chris,
  These were made by Bosch originally....suspect they were glued in and
the glue has aged and repeated starting cycles fatigued the bonding.
You can try to "pop" them off with a screwdriver at the frame/magnet
point.  If it doesn't pop easily, I'd leave it alone.  If it does, JB
weld it.
Don't pull the motors apart too many times...as you do, it weakens the
magnets and will cause more motor speed and higher amps (and shorted
armature).

...Walt 

-----Original Message-----
From: elec-trak-bounces cosmos phy tufts edu
[mailto:elec-trak-bounces cosmos phy tufts edu] On Behalf Of Christopher
Zach
Sent: Sunday, December 09, 2007 6:58 PM
To: Elec-Trak
Subject: (ET) Broke another motor

Well, one of the motors on my deck died last week. I was doing nothing
worse than simply mowing. Stopped, checked the blades and found the
center motor had jammed. Didn't even have to disassemble it to diagnose
broken magnets.

Sure enough, pulled the motor. Bearings were fine, one of the magnets
had unglued from the wall, hit the armature, and broken into fragments.

This is the second large can motor that I have seen this happen on. 
Never seen it on a small can motor; those just short their armatures. So
any idea why this happens, and is it possible to de-glue the magnets on
a good large-frame motor and JB-Weld them back in before they incinerate
themselves?

I have one large can motor left in my stash. Might be a good idea to do
something with it over the winter.

Chris

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