Today's Message Index:
----------------------
1. 10:01 AM - Rotax/Ducati alternator webpage (Gilles Thesee)
2. 11:02 AM - Re: Rotax/Ducati alternator webpage (Charlie England)
3. 12:10 PM - Re: Rotax/Ducati alternator webpage (Robert L. Nuckolls, III)
4. 12:23 PM - Re: Rotax/Ducati alternator webpage (C&K)
5. 03:41 PM - Re: Rotax/Ducati alternator webpage (Gilles Thesee)
6. 06:39 PM - Re: Crossover Light on (Robert L. Nuckolls, III)
Message 1
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| 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
Message 2
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| Subject: | Re: Rotax/Ducati alternator webpage |
On 5/10/2020 11:57 AM, Gilles Thesee wrote:
> <gilles@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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Message 3
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| Subject: | Re: Rotax/Ducati alternator webpage |
>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 . . .
Message 4
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| Subject: | Re: 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:
> On 5/10/2020 11:57 AM, Gilles Thesee wrote:
>> <gilles@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
>
> <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient&utm_term=icon>
> Virus-free. www.avast.com
> <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient&utm_term=link>
>
>
> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
Message 5
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| Subject: | Re: Rotax/Ducati alternator webpage |
Le 10/05/2020 19:57, Charlie England a crit:
>
> *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 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
Message 6
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| Subject: | Re: Crossover Light on |
>
>So..,, since then, I finished wiring in radios etc, and now the
>cross over light is on when I turn on only the Aux master (I have
>installed the Z-14 dual batt dual alternator). (It's in a Long Ez).
>Everything seems to work correctly, starter, crossover, etc. when I
>turn on the main master I don't get the light, when I turn on both
>masters, I don't get the light, it's just when I turn on only the Aux master.
Boy . . . that's a lot of harxware to be
carrying around in an Ez . . .
You have discovered a 'bug' in the architecture.
A 'sneak path' exists from the hot aux bus thru
the cross-over contactor coil then through
the CROSSOVER WARN light to the DEAD main bus
as a 'ground'.
See https://tinyurl.com/ydg99c5w
You can fix this by adding a diode (any handy
size will do) in series with the CROSSOVER WARN
light as shown in the sketch.
You can install it in the lead wire to the
annunciator fixture. See
https://tinyurl.com/kyc6tq6
for the technique.
Thanks for the heads-up! I'll update
Z14 to add this fix.
Bob . . .
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