Re: (ET) Wiring up a E12 motor for simple power source

["Konstanty, Walter (GE Energy Services)" <Walter Konstanty ge com>]

Bob,
    Brushes are "angled" in a brushholder for stability.  The spring
pushes them against the reaction surface (longer side) to prevent the
brush from cocking when rotation is changed.  On pure radial brush
holders, the brush can rock from one rotation to the other and make the
bottom "v" shaped which lowers the contact surface and increases the
brush density (sparking, chipping, and other bad stuff can happen).
When you run "into" the brush angle, there is slightly more friction and
mechanical wear but not usually enough to worry about.  On larger motors
with single direction, it would make enough difference to set them with
rotation.
   So, if the commutator is in good shape, nothing to worry about.

...Walt

-----Original Message-----
From: Bob Brandon [mailto:bobbrandon frontiernet net] 
Sent: Sunday, June 12, 2011 3:41 PM
To: Christopher Zach; elec-trak cosmos phy tufts edu
Subject: Re: (ET) Wiring up a E12 motor for simple power source

Thanks, Chris, for the input on wiring.
Now for the mechanical problem; how to put the armature back in whilst
restraining the brushes. There is wiring from the brush holder to the
field which prevents removing the brush holder completely.

And it kind of looks like I may be operating this in the "reverse" mode
all the time. (Considering the extreme slant of the brush angle from a
radial
line.)  I think I will need CCW viewed at shaft end


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