REFLECTOR: IVO Repair?

[John Dibble]

Jim,

Not sure I understand.  Was it just a loose connection?  If so, where?

John

Jim & Sharon Beck wrote:

> 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 betweenthe 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
>
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