Received-SPF: pass
 receiver=logan.com; client-ip=64.102.122.149; envelope-from=echristl@cisco.com
Message-ID: <421E2D48.2050405@cisco.com>
Date: Thu, 24 Feb 2005 14:38:48 -0500
From: Ernest Christley <echristl@cisco.com>
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.3) Gecko/20040929
MIME-Version: 1.0
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Racemate alt/water pump
References: <list-757796@logan.com>
In-Reply-To: <list-757796@logan.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit

WRJJRS@aol.com wrote:

>Ernest, The perm.mag. ALTERNATOR is an alternator. It doesn't use brushes and a commutator. There are/were excited field generators as well. The PM alternator uses a y winding and a diode grid to output dc just like a excited winding alt. Our system should put out charging voltage at or very close to idle. 
>Bill
>  
>

I'll be easy to get along with.  For all I care, we can call it a yellow 
daisy at this point.  I just want one 8*)

My premise may be way off, but isn't the open lead output voltage linear 
with RPM?  So my thinking goes, if you get charging voltage at idle of 
1000, it will be 6 times higher (over 70V) at a cruise RPM of 6000.  I'm 
sure the electronics can be designed to handle that, but how safely and 
robustly, and how much protection will the wire need.  If the system 
didn't get to charging voltage until, let's say, 3000RPM, then at cruise 
you have less than 30V on the line*, which is still considered to be low 
voltage.


*Notice, I resist the urge to call the output line a B-lead. 8*)