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                           AeroElectric-List Digest Archive
                                      ---
                     Total Messages Posted Mon 01/18/16: 2
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Today's Message Index:
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     1. 03:17 PM - Re: Schematic for twin PM alternators  (user9253)
     2. 08:06 PM - Re: Re: Schematic for twin PM alternators  (ashleysc@broadstripe.net)
 
 
 
________________________________  Message 1  _____________________________________


Time: 03:17:08 PM PST US
Subject: AeroElectric-List: Re: Schematic for twin PM alternators
From: "user9253" <fransew@gmail.com>


B & C permanent magnet alternator schematic:
http://www.bandc.aero/pdfs/420-506_revb.pdf

> Please allow a 75 year old from New England, the home of 
> sarcastic humor, to note: So many e-mails entitled; "Schematic 
> for Twin PM Alternators." So few schematics actually presented.

OK, I have attached another version.
Design considerations:
Rectifiers/Regulators get hot.  Connecting two alternators to 
one rectifier/regulator could overheat it (when under heavy load).
If the output of two separate rectifier/regulators are 
connected together, will the load be shared equally or will one 
be overworked and self destruct?
If there is an over-voltage condition, how will the faulty 
regulator be identified and shut off quickly (in less than one second)?
If one charging system fails, will the other one then be
overloaded and fail also?
Hundreds of Rotax powered aircraft are flying with modern glass 
panels and LED lighting powered by one 20 amp permanent-magnet 
dynamo (usually loaded to no more than 80 percent).  The 
Revmaster should be able to do the same using one alternator at 
a time.  An outbound leg can use the left alternator and the 
inbound leg can use the right alternator.  The pilot will know 
that both systems work and there will always be a backup.

--------
Joe Gores


Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=452091#452091


Attachments: 

http://forums.matronics.com//files/revmaster3_492.pdf


________________________________  Message 2  _____________________________________


Time: 08:06:09 PM PST US
From: ashleysc@broadstripe.net
Subject: Re: AeroElectric-List: Re: Schematic for twin PM alternators


Hi Joe;
Being internally regulated, each alternator has it's own regulator.  I think I
will probably wire so that only one is in use at a time.
Cheers!   Stu.

----- Original Message -----
From: "user9253" <fransew@gmail.com>
Sent: Monday, January 18, 2016 3:08:51 PM
Subject: AeroElectric-List: Re: Schematic for twin PM alternators


B & C permanent magnet alternator schematic:
http://www.bandc.aero/pdfs/420-506_revb.pdf

> Please allow a 75 year old from New England, the home of 
> sarcastic humor, to note: So many e-mails entitled; "Schematic 
> for Twin PM Alternators." So few schematics actually presented.

OK, I have attached another version.
Design considerations:
Rectifiers/Regulators get hot.  Connecting two alternators to 
one rectifier/regulator could overheat it (when under heavy load).
If the output of two separate rectifier/regulators are 
connected together, will the load be shared equally or will one 
be overworked and self destruct?
If there is an over-voltage condition, how will the faulty 
regulator be identified and shut off quickly (in less than one second)?
If one charging system fails, will the other one then be
overloaded and fail also?
Hundreds of Rotax powered aircraft are flying with modern glass 
panels and LED lighting powered by one 20 amp permanent-magnet 
dynamo (usually loaded to no more than 80 percent).  The 
Revmaster should be able to do the same using one alternator at 
a time.  An outbound leg can use the left alternator and the 
inbound leg can use the right alternator.  The pilot will know 
that both systems work and there will always be a backup.

--------
Joe Gores


Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=452091#452091


Attachments: 

http://forums.matronics.com//files/revmaster3_492.pdf


 

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