Thread: Drill motor Demagnetization and lowered-torque woes
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Unread 24-06-2002, 03:43
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#0047 (ChiefDelphi)
  
Join Date: May 2001
Location: Pontiac, MI
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Never seen this before
Posted by Joe Johnson at 04/21/2001 6:42 PM EST


Engineer on team #47, Chief Delphi, from Pontiac Central High School and Delphi Automotive Systems.


In Reply to: Re: Drill motor Demagnetization and lowered-torque woes
Posted by Bill Beatty on 04/21/2001 5:10 PM EST:



I have never seen this. The closest I have seen is
when we toast motors from simply overheating them. I
am not sure of the failure mode actually. I assume
that it is from either high resistance in the brushes
or form some of the windings of the motor being shorted
out of the current path by the insulation breaking
down. This will make effectively reduce the number of
turns of the armature which will make the motor
performance less.

I will keep this in mind. Maybe your explanation is
the correct one. If so, I don't know exactly what the
prevention scheme is.

Maybe I need to do a little research or maybe I will
call up one of my motor suppliers to pick their brains
on this matter. It is SO nice to have your day job and
FIRST overlap some times ;-)

I will let you know if I find out anything.

By the way, did you keep the motors that were possibly
demagnitized? I am sure Johnson Electric (the motor
mfg.) would be interested in them if they are handy.

Joe J.



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