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Message-ID: <004001c8a9c6$6a01c9e0$6400a8c0@george>
From: "George Lendich" <lendich@optusnet.com.au>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-2876242@logan.com>
Subject: Re: [FlyRotary] Re: the Kubota dynamo
Date: Tue, 29 Apr 2008 16:58:21 +1000
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Ernest,

What did it cost you for this set-up?

I can't quite visualize how the stators fit the back of the PSRU without 
interfering with the damper OR is there room between the damper drive plate 
and the flywheel.


George ( down under)

> I have one of the Harley generators.  It's rated for 30A.  The magnets are 
> mounted to the inside edge of a heavy gauge cake pan...heavy gauge being 
> defined as something like 0.100".  This will bolt up to my flywheel, with 
> the bottom of the pan against the flywheel.  It will spin at 6000RPM in 
> cruise, which is right about where it would spin on a motorcycle.
>
> The stator looks like an octopus that has been tied up with copper wire 
> for some sort of medieval torture.  It's got two wires coming off of it 
> that go directly to the regulator.  The stator will bolt directly to the 
> back of my PSRU.  The wires don't spin, or move at all for that matter 
> (relative to the mounting points).  No contacts.  No slip rings.
>
> Voltage is a driving force.  Current is what is being driven.  The 
> switching type regulator takes advantage of the fact that when you first 
> apply a force, it takes a while for the driven stuff to start moving. 
> We're talking microseconds, but there is a delay.  When the rotor spins to 
> fast, you get to much of a driving force.  If left unchecked, the ship's 
> systems will be overloaded.  Before this can happen, the regulator turns 
> the generator off.  Without a circuit, no current flows and there's no 
> load on the generator*...because it has nothing to push.  Before the 
> current runs out (and the voltage drops as a result), the regulator 
> switches the generator back on.  The regulator does it fast enough so that 
> nobody notices the ripple of voltage going up and down.
>
> I'm counting on this for my design of replacing the distributor with a 
> small generator.  I'll set the regulator at 11V.  Ships power will be at 
> least 12V.  Because it will always see the ship as being in overvoltage 
> during normal operation, it won't actually switch on.  If I have a power 
> outage from the main generator, the distributor mounted generator will 
> kick in, and (through a diode arrangement) drive the primary electronic 
> ignition.
>
> That should create enough controversy to keep Ed going  8*)
>
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