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RE: surging, motor
- Subject: RE: surging, motor
- From: "David Roden" <roden ald net>
- Date: Sun, 3 Jan 1999 22:47:46 -0500
- Sender: owner-elec-trak cosmos5 phy tufts edu
Lots of great posts on this one. This mailing list tends to be quiet
much of the time, but when somebody has a problem everyone pulls out the
stops. I sure appreciate the help folks have provided me, and hope I can
be of help to others.
Christopher Meier <Christopher Meier cwix com> wrote:
> Just to be clear;
> occasionally, when at a complete start,
> when I advance the speed selector, the
> contactors clack on, but the motor doesn't
> budge or make a peep - nada nothing.
Does the ammeter deflect upscale when you do this? If not, you may have
one or more open windings in the armature. The winding might be just
detatched from the commutator segment. These are usually silver-soldered
to withstand heat, so you can't just solder it back on with a 25-watt
It might also be just a cruddy com segment. In any case you should not
continue to run it. If you have a motor shop you trust, have them do a
test. If you need to find a shop, call a couple local golf courses and
ask the mechanic for the name of the shop that does motor work for him.
If the ammeter does deflect (especially if it deflects *a lot*), it might
suggest some pretty serious friction in bearings or brushes/com.
Friction would have to be *very* high; starting torque on these motors is
pretty good. This seems unlikely, since you're able to rotate the motor
> I turn the speed selector off, reach down, rotate the motor pully
> slightly, then advance the speed selector, and it works fine again.
> Like a dead spot or something.
I have seen motors that wouldn't start in spite of drawing monstrous
currents -- it was an open field connection. However in this case a
field problem doesn't seem so likely since you say it starts on its own
after you have nudged the pulley.
I agree with the other posts; check the commutator, brushes, and armature
windings. Or pull it and take it to the shop. Don't keep on running it,
or it's apt to do more damage to itself.
David Roden THE VIRTUAL PD
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