On the Lemco or Agni motor, the brush gear can be moved for optimal
performance in either CW or CCW rotation. For use where the motor will be
run at full load in both directions (say a fork lift) the brushes are timed
neutrally. The Etek does things a little differently. The brushes are fixed,
but the magnets can be moved. That's what the slots on the case are for.
The brushes will be fine in either direction, but they need to be run-in
because the brushes are able to tilt slightly in the holders. When the motor
is run in reverse rotation the brush tilts the other way and brings a sharp
edge into contact with the commutator. That gives rise to the squeaking
noise and means you only have a small contact area. If you combine this with
the wrong brush timing, then you have a motor that is likely to fail. You
need to seat the brushes by running the motor on the bench for quite a few
hours, or by using a brush stone.
When the brushes are run in, you can adjust the timing. The simplest way
when you have two motors electrically and/or mechanically in parallel is to
adjust them to run at the same rpm.
Paul Compton
www.evguru.co.uk
www.sciroccoev.co.uk
www.bvs.org.uk
www.morini-mania.co.uk
www.compton.vispa.com/the_named
----- Original Message -----
From: "Andrew Wowk" <[EMAIL PROTECTED]>
To: "ElectricMotorcycles" <[email protected]>
Sent: Sunday, March 25, 2007 10:14 AM
Subject: Re: [ElectricMotorcycles] Running etek CCW
I suppose I should give a little more detail...
I heard of someone smoking a PMG 132 motor running it CCW, so that got me
a
little worried. I talked to Brian at thunderstruck-ev.com, and he said
that
someone in Australia was running two eteks horizontally opposed in a car
and
one kept smoking. It was the one that was being run CCW. That got me a bit
more worried. He also said that the brushes are going to wear a lot
faster.
I've heard that the Lemco motor has to have the brushes rotated or
something
like that for the direction of operation.
The etek manual says nothing about CCW rotation.
Anyone have any experience with this, or ideas/comments?
Regards,
Andrew
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