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Message-ID: <000401c8a998$163d0500$6400a8c0@george>
From: "George Lendich" <lendich@optusnet.com.au>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-2875871@logan.com>
Subject: Re: [FlyRotary] Re: the Kubota dynamo
Date: Tue, 29 Apr 2008 11:26:43 +1000
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 Scott,
So that's what a regulator does, I though it regulated current flow to the 
battery, maintaining 12 to 14 volts.

Our 'Ship Chief' must be into electronics, now let me get this straight- you 
must have a switching regulator, which consists of a regulator with a solid 
state circuit, which switches current on and off - off when the current 
exceeds a certain limit ( voltage?) and back on at other times.

I will get used to this electronics stuff eventually - just tell me if I 
interpreted this incorrectly! At lest I will know what to ask for.

On a similar matter I'm seriously looking at a motorbike style generator/ 
alternator. The one on my Suzuki would be up to the task as it put out 
sufficient power for an 1800 cc, fuel injected Twin cylinder - just have to 
work out how to attach it to the motor.
George ( down under)

> SHIPCHIEF@aol.com wrote:
>> George (down under);
>> Could do that, we were just refering to how the regulator handles excess 
>> power with a PM alternator, that is, it can't reduce the alt output, it 
>> can only sink excess power to ground and let the excess heat go 
>> somewhere.
>> That's a strong motivator to size the alternator output to be no greater 
>> than the desired load.
>> Scott E
>>
> That is one method for regulation.  Take in everything and dump what isn't 
> necessary into ground.  The problem is that an over-rev will pump too many 
> electrons through the stator wires and burn them up.
>
> A more modern method is to put a solid-state switch in the circuit.  If 
> the generator puts too much voltage out, cut the circuit then bring it 
> back online when the regulator output drops.  The regulator switches 
> (hence the name "switching regulator") at a rate high enough that the 
> regulator appears to be stabilized around the set voltage.
>
> The heat sink method is good enough when the engine rpm and loads are 
> characterized well enough for the more sophisticated electronics to not be 
> needed.
>
>
>
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