REFLECTOR: IVO Repair?

[Jim & Sharon Beck]

Hi John:
I don't know about the Ivo but sounds a lot like the failure on my electric
MT. I would take the spinner off, check it out
 with a voltmeter and it would work again for a few minutes to a flight and
then have no control again.  Failure was between
the connection on the outside of the motor and and the connection to the
brushes inside. touching the outside connection ,
would cause it to make contact until it vibrated loose again.
Jim

On Thu, Jun 16, 2011 at 5:33 PM, John Dibble <aminetech at bluefrog.com> wrote:

> I've put over 100 hours on the IVO hub that Travis generously gave me.
> Lately it's been sluggish.  During a 5 hour trip 3 weeks ago I couldn't
> get the rpm below 2600 and that was at a bit less than full power.
> After sitting for 3 weeks, I made a short flight and it would not adjust
> from fine pitch.  My ammeter showed no current going to the motor.  The
> slip rings measured "open circuit", suggesting the motor was bad, so I
> removed it.  Out of curiousity, I connected a battery charger to the
> motor leads and was surprised when it ran fine.  So I re-installed it
> and it worked fine for 5 seconds and then quit, again showing open
> circuit.  I called IVO and they said the motor brushes might be worn, or
> the springs weak and told me to send it in.  I decided to investigate a
> little and removed the back cover and first sleeve, exposing the motor.
> The brushes looked good and the springs seemed strong, but I have no
> idea how strong they need to be.  The stationary end of one spring was
> bent a little, so I straightened it.  Also the springs wrap around the
> braded wire going to the brushes and I adjusted the wire a bit to be
> sure it wouldn't interfere with the springs keeping the brushes in
> place.  I put the cover back on and was ready to package it and send to
> IVO, because it didn't seem like I did anything to fix it.  But I
> decided to first re-install and see if there was any difference.  BIG
> DIFFERENCE.  I went flying and the pitch adjusted quickly.  The rpm
> easily dropped to 2400 at full power.  This is much better that it's run
> in a long time.  Now if I can just figure out what I did....
> The motor is made by Yokomo, a Japanese company.  I checked their
> website and found a few motors for model cars.  I have no idea if this
> is the same motor.  My motor had no other identification other than some
> Japanese.  Anyone know about these motors?
>
> John
>
> _______________________________________________
> To change your email address, visit
> http://www.tvbf.org/mailman/listinfo/reflector
>
> Visit the gallery!  www.tvbf.org/gallery
> user:pw = tvbf:jamaicangoose
> Check new archives: www.tvbf.org/pipermail
> Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.tvbf.org/mailman/private/reflector/attachments/20110616/f8bd154f/attachment.htm>