Re: (ET) hot motor

["RJ Kanary" <rjkanary nauticom net>]

           Permanent magnet motor? {I'm getting in a rut, aren't I ? } The 
field poles have to have a particular alignment in relation to the brush 
location on the commutator.Torque can be biased to be increased in one 
direction of rotation, lessened in the other. Ever notice how a cordless 
drill has more torque going 'forward' than in reverse? That's why.
       If the orientation is screwed up, you can end up with an armature 
that uses gobs of amps......and turns most of them into heat.
      The same thing can be done to a wound field motor.

----- Original Message ----- 
From: "Steve Gaarder" <gaarder ecovillage ithaca ny us>
To: "RJ Kanary" <rjkanary nauticom net>
Cc: "et" <Elec-trak cosmos phy tufts edu>
Sent: Sunday, August 06, 2006 12:48 PM
Subject: Re: (ET) hot motor


> Can you explain this a little more clearly?  I have a similar problem - a 
> motor (on an E12M) that runs, but gets hot.  A local motor shop checked it 
> and said that things seemed fine.
>
> thanks,
>
> Steve Gaarder
>
> On Sun, 6 Aug 2006, RJ Kanary wrote:
>
> >        Permanent magnet motor ? If so, did you mark the brush end bell
> > orientation before disassembly? If not, that could be the culprit. The GE
> > and made for GE motors have tabs and slots to prevent this. Just a
> > thought.................
> >
> > ----- Original Message -----
> > From: "Neil Dennis" <wombatt gmail com>
> > To: "et" <Elec-trak cosmos phy tufts edu>
> > Sent: Sunday, August 06, 2006 11:13 AM
> > Subject: (ET) hot motor
> >
> >
> > > Lets see if this one bounces !!
> > >
> > > I just pulled one of the mower motors from the JD, it was running "weak"
> > > andgot hot enough to burn off one of the motor terminal wires at the
> > > chassis connector [;-[   It seems to spin over ok by hand, I put in a
> > > new lower bearing this spring (the old one was getting noisy) and hope I
> > > got it together right - it has been running weak since then but sees to
> > > by slowly dying.
> > >  Any thoughts as to what I could look for or what i may have screwed
> > > up, it had been ok before the teardown.
> > >
> > > wombat
> > >
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> >
> >
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