Mailing List flyrotary@lancaironline.net Message #2450
From: Peter Cowan/Lexy Cameron <cowcam@pipcom.com>
Subject: Re: [FlyRotary] Re: starters and solonoids (pt. 2) again
Date: Fri, 8 Aug 2003 07:32:34 -0400
To: Rotary motors in aircraft <flyrotary@lancaironline.net>


Dale I'd say there are no low speed windings on the Mazda because there is
only one wire from the contactor to the starter. When I figure out how to
order the new solonoid, I will replace this system.
Peter

>    I'm speaking in general here.  I don't have intimate knowledge of the
specific Mazda electricals you might be using.
>
>    Proper engagement of the starter motor depends on a couple of things
happening in proper sequence.
>
>   [1] power reaching the "low speed" windings of the motor.
>   [2] as the motor begins to turn, the solenoid pushes the drive gear into
engagement with the flywheel ring.
>   [3] the solenoid closes its integral contactor, sending current to the
"high speed" windings of the motor.
>
>    The configuration you describe would be seem to be putting power
directly to the high-speed winding, not giving the solenoid time to mesh the
drive gear as it normally would during the brief low-speed phase.  That will
result not only in missed starts, but rapid wear of the the drive and ring
teeth.
>
> Dale
>
>
> > Looking at Dale's excellent freehand drawing with the change that the
Motor
> > M is wired directly to "C" (I'm not using the contactor just the
solonoid),
> > I thought of another potential issue. I'm now getting frequent missed
gear
> > engagements when I hit the starter switch. Could this be due to a slight
> > "timing" difference between this setup and one solonoid/contactor? With
the
> > one Mazda solonoid/contactor the first thing that moves is the solonoid
> > which throws the starter gear into the ring gear, then the electrical
> > contact is made for power to the motor. So the gear is activated a
little
> > ahead of the contactor. With my setup, power gets to the motor at the
same
> > time as power to the solonoid windings so the motor is likely staarting
> > before the gear engages. Any thoughts/
> > Peter
>
>
>
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