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Rotax/Ducati alternator webpage

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gilles(at)elixir-aircraft
Guest

Posted: Sun May 10, 2020 9:01 am Post subject: Rotax/Ducati alternator webpage

Hi all,



Reviewing some - not so - old messages on the 'List, I got the notion 

that the Rotax alternator is still a relevant topic.



So I took the opportunity of the lockdown for crafting a webpage on the 

study performed some years ago in the University of Grenoble labs.



The goal is to provide an easier an hopefully more pleasant reading as 

compared with the different copies that have been "circulated" here and 

there on the Web.



http://contrails.free.fr/elec_alt_rotax.php

If would be delighted if some of you guys took a look at it and tell me 

whether an English ('Frenglish' ?) version is worth the effort.



Providing a readable and accurate English document is beyond my 

abilities, so if need be some "Native speaker improved google" version 

will be most welcome 



Thanks,



Take care everyone,

-- 

Best regards,

Gilles

http://contrails.free.fr

http://lapierre.skunkworks.free.fr

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ceengland7(at)gmail.com
Guest

Posted: Sun May 10, 2020 10:02 am Post subject: Rotax/Ducati alternator webpage

On 5/10/2020 11:57 AM, Gilles Thesee       wrote:

     

      	  Quote: 	
		  -->       AeroElectric-List message posted by: Gilles Thesee       <gilles(at)elixir-aircraft.com> (gilles(at)elixir-aircraft.com)       

       

       Hi all,       

       

       Reviewing some - not so - old messages on the 'List, I got the       notion that the Rotax alternator is still a relevant topic.       

       

       So I took the opportunity of the lockdown for crafting a webpage       on the study performed some years ago in the University of       Grenoble labs.       

       

       The goal is to provide an easier an hopefully more pleasant       reading as compared with the different copies that have been       "circulated" here and there on the Web.       

       

       http://contrails.free.fr/elec_alt_rotax.php       

       

       

       If would be delighted if some of you guys took a look at it and       tell me whether an English ('Frenglish' ?) version is worth the       effort.       

       

       Providing a readable and accurate English document is beyond my       abilities, so if need be some "Native speaker improved google"       version will be most welcome        

       

       Thanks,       

       

       Take care everyone,       

       

       

     	
     Hi Giles,

     

     I'm always interested in 'data'; thanks for putting it up. I took a     quick look using Chrome, and let Google translate from French to     English. The only unusual term I noticed during a quick scan was     'straighten' where 'rectify' would be used in English.

     It is therefore necessary both         toÂ straightenÂ its AC voltage to         transform it into DC voltage, toÂ smooth itÂ to obtain a         constant voltage, and toÂ regulate itÂ around 14 Volts.

     And:

     NB:Â The frequency is         used to determine the rotation speed.     200 Hz with 5 pairs of poles         corresponds to 40 rpm, i.e. 2400 rpm.

       Not really sure what's going on there, with 40 rpm     and 2400 rpm.

     

     And of course, we barbarians always struggle with temperature     measured in C. Not because it isn't better, but because we weren't     properly schooled. 

     

     Otherwise, it was very readable using the Google Translate version.

     

     Charlie

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nuckolls.bob(at)aeroelect
Guest

Posted: Sun May 10, 2020 11:10 am Post subject: Rotax/Ducati alternator webpage

 	  Quote: 	
		  Not really sure what's going on there, with 40 rpm and 2400 rpm. 	


    That's a typo . . . should be 40 rev/sec = 2400 rev/min



    I'd seen that article before . . . many moons ago. I might

    have a copy in the archives somewhere. Nicely done.



 

   Bob . . .

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yellowduckduo(at)gmail.co
Guest

Posted: Sun May 10, 2020 11:23 am Post subject: Rotax/Ducati alternator webpage

The rotational speed determines the frequency

2400rpm=40rev/sec

40 x 5 poles  0 hz

Ken



On 10/05/2020 1:57 PM, Charlie England wrote:

 	  Quote: 	
		   On 5/10/2020 11:57 AM, Gilles Thesee wrote:

> 

> <gilles(at)elixir-aircraft.com>

>

> Hi all,

>

> Reviewing some - not so - old messages on the 'List, I got the notion 

> that the Rotax alternator is still a relevant topic.

>

> So I took the opportunity of the lockdown for crafting a webpage on 

> the study performed some years ago in the University of Grenoble labs.

>

> The goal is to provide an easier an hopefully more pleasant reading 

> as compared with the different copies that have been "circulated" 

> here and there on the Web.

>

> http://contrails.free.fr/elec_alt_rotax.php

> If would be delighted if some of you guys took a look at it and tell 

> me whether an English ('Frenglish' ?) version is worth the effort.

>

> Providing a readable and accurate English document is beyond my 

> abilities, so if need be some "Native speaker improved google" 

> version will be most welcome 

>

> Thanks,

>

> Take care everyone,

 Hi Giles,



 I'm always interested in 'data'; thanks for putting it up. I took a 

 quick look using Chrome, and let Google translate from French to 

 English. The only unusual term I noticed during a quick scan was 

 'straighten' where 'rectify' would be used in English.

 It is therefore necessary both to*straighten*its AC voltage to 

 transform it into DC voltage, to*smooth it*to obtain a constant 

 voltage, and to*regulate it*around 14 Volts.

 And:

 *NB:*The frequency is used to determine the rotation speed.

 200 Hz with 5 pairs of poles corresponds to 40 rpm, i.e. 2400 rpm.

 Not really sure what's going on there, with 40 rpm and 2400 rpm.



 And of course, we barbarians always struggle with temperature measured 

 in C. Not because it isn't better, but because we weren't properly 

 schooled. 



 Otherwise, it was very readable using the Google Translate version.



 Charlie



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gilles(at)elixir-aircraft
Guest

Posted: Sun May 10, 2020 2:41 pm Post subject: Rotax/Ducati alternator webpage

Le 10/05/2020 Ã  19:57, Charlie England       a Ã©critÂ :

     

      	  Quote: 	
		                

       NB:Â The           frequency is used to determine the rotation speed.       200 Hz with 5           pairs of poles corresponds to 40 rpm, i.e. 2400 rpm.

         Not really sure what's going on there, with 40 rpm       and 2400 rpm.

       

       And of course, we barbarians always struggle with temperature       measured in C. Not because it isn't better, but because we weren't       properly schooled. 

       

       Otherwise, it was very readable using the Google Translate       version. 	
     



          

Charlie and all,     

Thank you to those who took the time.     

So Google might be a valuable source after all.     

It is true that we're so picky on style and grammar in my       language...     

I'll have a try at it, do not hesitate to propose a correction if       something looks awkward or inaccurate.

          

Yes it seems Google got revolutions/s and rpm all mixed up.

       As to the degrees Celsius, I'm afraid this is a report made in a       University lab, it would be an offence to use illegal units      

Besides, in my WWII era P51 flight manual, engine temps are in C.       The boys could manage 80 years ago, why not homebuilders in the       21st century ?     

Thanks to everyone,     -- 

       Best regards,

       Gilles

       http://contrails.free.fr

       http://lapierre.skunkworks.free.fr

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nuckolls.bob(at)aeroelect
Guest

Posted: Mon May 11, 2020 8:01 am Post subject: Rotax/Ducati alternator webpage

At 05:37 PM 5/10/2020, you wrote:

  	  Quote: 	
		  Le 10/05/2020 Ã  19:57, Charlie England a Ã©critÂ :

  	  Quote: 	
		  

 NB:Â The frequency is used to determine the rotation speed.

 200 Hz with 5 pairs of poles corresponds to 40 rpm, i.e. 2400 rpm.

 Not really sure what's going on there, with 40 rpm and 2400 rpm.



 And of course, we barbarians always struggle with temperature measured in C. Not because it isn't better, but because we weren't properly schooled. 



 Otherwise, it was very readable using the Google Translate version. 	




 Charlie and all,



 Thank you to those who took the time.



 So Google might be a valuable source after all.



 It is true that we're so picky on style and grammar in my language...



 I'll have a try at it, do not hesitate to propose a correction if something looks awkward or inaccurate. 	


   Gilles,



   This is an extra-ordinary paper that defines

   the physics that govern the operation of that particular

   alternator . . . and offers a benchmark for how all

   pm alternators should be explored and documented.



   I'd be pleased to add your work product to

   the library on aeroelectric.com



 

 

   Bob . . .

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gilles(at)elixir-aircraft
Guest

Posted: Tue May 12, 2020 4:15 pm Post subject: Rotax/Ducati alternator webpage

Le 11/05/2020 à 17:58, Robert L.       Nuckolls, III a écrit :

     

      	  Quote: 	
		                

             Gilles,

           

             This is an extra-ordinary paper that defines

             the physics that govern the operation of that particular

             alternator . . . and offers a benchmark for how all

             pm alternators should be explored and documented.

           

             I'd be pleased to add your work product to

             the library on aeroelectric.com 	
     



          

Bob,     

Thank you for the kind words, and the good Aeroelectric job over       the years.     

Feel free to use any material from Contrails ! as you see fit.     

Here is the alternator page translation :       http://contrails.free.fr/elec_alt_rotax_en.php     

Any help in improving the English text will be appreciated.     -- 

       Best regards,

       Gilles

       http://contrails.free.fr

       http://lapierre.skunkworks.free.fr

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