Re: (ET) Overheating deck motor

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

  This is a 2 pole permanent magnet motor.  If the armature is ok, the 
other possible causes are:
- High friction bearings or bad bearings...should spin freely

- Loss of field magnetism.  Alinico magnets were used.
  If you pull the rotor in and out, you lose magnetism each time you do 
it.  Less field flux = higher speed/load
  When the motor was built, the stator was "charged" with an electromagnet 
at the factory.  Some shops may have that capability.

...Walt

-----Original Message-----
From: elec-trak-bounces cosmos phy tufts edu
[mailto:elec-trak-bounces cosmos phy tufts edu]On Behalf Of Steve
Gaarder
Sent: Friday, July 14, 2006 8:23 AM
To: elec-trak cosmos phy tufts edu
Subject: (ET) Overheating deck motor


We have a deck motor that runs, but draws a lot of current and overheats. 
I can think of two possible causes:

1.  Shorted armature winding(s), but we took it to a local motor guy; he 
put the armature on his "growler" and found no problems.

2.  Field magnets have somehow become much weaker - can this happen?

Any other ideas?

thanks,

Steve Gaarder

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