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From: "Ed Klepeis" <techwelding@comcast.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-2876226@logan.com>
Subject: Re: [FlyRotary] Re: the Kubota dynamo
Date: Mon, 28 Apr 2008 20:51:39 -0500
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Dear George
         I have a  brand new  Kubota Alt. and regulator that I bought to put 
on a gyro that never was done. Let me know if anyone interested.
                                                                             
                           Regards
                                                                             
                  Ed Klepeis
----- Original Message ----- 
From: "George Lendich" <lendich@optusnet.com.au>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Monday, April 28, 2008 8:26 PM
Subject: [FlyRotary] Re: the Kubota dynamo


> 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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>
>
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