From: John Stewart-Smith (john_stewartsmith@hotmail.com)
Date: Thu May 30 2002 - 07:38:35 PDT
List, I remember that our MEP's ran at 1800 rpm when we developed 60Hz, and
we could turn them down to 1500 rpm to develop 50Hz. Our 400Hz dash8 jet
turbines ran (I think) at 12,000 rpm. Oddly enough, all 3 of these work out
to 0.0333333r, convenience or was there a purpose?
-Sarge
----- Original Message -----
From: <wwd@netheaven.com>
To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
Sent: Thursday, May 30, 2002 8:27 AM
Subject: Re: [MV] MEP-023A
> In <list-728395@skylee.com>, on 05/28/2002
> at 07:35 PM, specwar <specwar@piace.com> said:
>
> >I was wondering if it is possible to convert the MEP-023A to output at
> >60Hz instead of 400?
> >Robert Wilson
> >M35A2C
> >caretaker of M101A1 with MEP-023A Generator
>
> If any unit is designed for 400hz it can only output at that frequency or
> higher, possibly. To operate at lower freq requires MORE iron in the core
> structure else it will overheat and destruct. That is the reason for 400hz
> in the first place, simply to save weight esp wrt aircraft equipment.
>
> AC power began, rather arbitrarily at 25hz which required HUGE rotors and
> stators, but it was for railroads so they did not care at first. England
> then shifted to 50hz to enjoy size and weight savings and remain there to
> this day (Europe too). Again this decision was arbitrarily arrived at by
> simply doubling the freq. Resulted in a weight savings something like 4
> times. The US chose to proceed with 60hz for additional savings plus the
> joy of easy synchronization with seconds & minutes. But is the synch
> really that much easier with 60? I'm now wondering . . . Bill
>
>
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