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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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