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From: "rijakits" <rijakits@cwpanama.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-520749@logan.com>
Subject: Re: [FlyRotary] PM alternator/generator with EWP
Date: Sun, 7 Nov 2004 16:05:51 -0500
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Again, my question:
From where do you have the idea, that belts are the major prolblem?

Thomas J.


----- Original Message ----- 
From: "Ernest Christley" <echristley@nc.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Saturday, November 06, 2004 2:33 PM
Subject: [FlyRotary] PM alternator/generator with EWP


> Per the discussion of breaking belts...
> 
> Belts are needed for two things, the alternator and the water pump.  But 
> if we replace the water pump can we get rid of the belt?
> 
> Has anyone considered replacing the crank angle sensor with a PM 
> alternator/generator?
> 
> The things are relative simple (a can of coiled wire with some magnets 
> on a spinning shaft in the middle), but what effect would a spinning 
> magnet have on the hall effect sensor that drives the ignition system?
> 
> I've been looking at this a while.  It looks like a hole could be tapped 
> and threaded into the top of the crank angle sensor shaft.  A generator 
> with a threaded shaft would be screwed into that, properly oriented 
> threads insuring that the generator shaft will never come unscrewed, and 
> some straps on the housing to keep it from spinning.
> 
> A 35A generator, is < 500W would only need a few ft.oz. of retaining 
> force at 6000RPM.
> 
> The front pulley could be replaced with the same sort of installation.
> 
> Another consideraton.  Alternators have a heavy shell, bearings and 
> mounting because there is a substantial side loads and vibrations 
> derived from the belt.  A gear driven generator can be much lighter, 
> with just a sheet metal can for a housing.
> 
> I've got a number for an electrical engineer who is going to help me 
> work out the feasability and sizing for this application, but I'd like 
> the thoughts of anyone on the list.
> 
> 
> -- 
> http://www.ernest.isa-geek.org/
> "This is by far the hardest lesson about freedom. It goes against
> instinct, and morality, to just sit back and watch people make
> mistakes. We want to help them, which means control them and their
> decisions, but in doing so we actually hurt them (and ourselves)."
> 
> 
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