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Generator suppressor

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jay(at)horriblehyde.com
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Posted: Mon Jun 18, 2012 9:02 am Post subject: Generator suppressor

I’m busy replacing an old regulator (carbon pile with a cut-out relay) on a de Havilland Chipmunk.  I bought a modern regulator from Zeftronics (who, in a world of poor service, excel themselves at being at the top of the bad service list) and was about to install it when I noticed that there is also what is termed a ‘suppressor’ between the generator and the regulator.

 

It is basically what I think is a smoothing filter – two inductors in series with two capacitors, one after each inductor, connected to ground.  There are one of these circuits connected to either side of the generator (that is, on either side of the main windings) and one to the one side of the field winding.  Since the original of this has disappeared from the aircraft I need to make another one, but I am not sure of what values of inductance and capacitance to use- does anyone have these values squirreled away somewhere so that I can make a new suppressor?

 

Thanks

 

Jay 

  [quote][b]

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nuckolls.bob(at)aeroelect
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Posted: Tue Jun 19, 2012 2:55 am Post subject: Generator suppressor

 	  Quote: 	
		  , but I am not sure of what values of inductance and capacitance to 

use- does anyone have these values squirreled away somewhere so that 

I can make a new suppressor?


	


    Not sure what these would be. I'd leave them

    off until you find that they are necessary.

    Most generator noises were antagonistic to

    ADF and low frequency nav services. You probably

    don't need them now.

   Bob . . .

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jay(at)horriblehyde.com
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Posted: Tue Jun 19, 2012 3:21 am Post subject: Generator suppressor

Thanks Bob,



I was thinking along the same lines.  It seems to me that these are simply a

broad spectrum smoothing filter.  I think that I will test run the generator

on my lathe and have a look at the output on a scope to see if it looks too

rough- a mass produced line filter may just do the job if any smoothing is

required.



Jay



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nuckolls.bob(at)aeroelect
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Posted: Tue Jun 19, 2012 6:39 am Post subject: Generator suppressor

At 06:20 AM 6/19/2012, you wrote:

 	  Quote: 	
		  



Thanks Bob,



I was thinking along the same lines.  It seems to me that these are simply a

broad spectrum smoothing filter.  I think that I will test run the generator

on my lathe and have a look at the output on a scope to see if it looks too

rough- a mass produced line filter may just do the job if any smoothing is

required.



Jay


	


   That's probably more trouble than it's worth.

   Generators produce a lot of trash. A 'scope

   picture is almost never informative. A spectrum

   analyzer would give you a notion of potential

   EMC problems but know that DO-160 calls for

   'qualified' devices to shrug off up to 1.5 volts

   pk-pk over 1 to 5 kHz



http://tinyurl.com/78kwfk8



   and lesser amounts above and below. A 'scope

   picture of this is pretty spectacular. Alternators

   are less 'spikey' but still offer considerable

   ripple voltage.



   Any filters you might need would go to issues

   in the RF spectrum



http://tinyurl.com/7wrhxbg



   and cannot be observed in a time domain display.

   Bob . . .

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jay(at)horriblehyde.com
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Posted: Tue Jun 19, 2012 8:26 am Post subject: Generator suppressor

Sigh... its never simple  

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