Re: (ET) Fw: E20 motor at 48V

["Mike Wallace" <metman glasgow-ky com>]

Guys,

It has always been my understanding that GE's use of numbers in the model 
identifications was a "rough" comparison of torque, not horsepower, to ICE 
tractors.

Like an E10 had a torque output roughly equivalent to a 10 HP ICE tractor.

Sound right?

Mike in KY

----- Original Message ----- 
From: "Konstanty, Walter (GE Indust, ConsInd)" <Walter Konstanty ge com>
To: "Jerry Rhodes" <jerry38 alltel net>; "Elec-trak Mail List" 
<elec-trak cosmos phy tufts edu>
Sent: Thursday, January 03, 2008 12:27 PM
Subject: Re: (ET) Fw: E20 motor at 48V


> T = (HPx5252)/RPM
>
>  Gas engines are rated in PEAK HP and develop rated torque at high
> speed.  Ex: 4.3 ftlb @ 3,600RPM
>  Electric motors are rated in CONTINUOUS HP and typically develop that
> at 0 RPM which drops off above base speed.
>
> Marketeers over-rate things like that 3.5HP vacuum that only draws 5
> amps......it's the high starting current converted to HP and not what it
> can really put out.....check the motor rated amps and that will tell you
> the real story on those vacuums and compressors.
>
>  It's torque you want......a rule of thumb is about 3:1 on electric vs
> gas.  The Elec-Trak numbers were based on gas tractor sizes and not
> comparative gas to electric motor HP's.
>
> ...Walt
> -----Original Message-----
> From: elec-trak-bounces cosmos phy tufts edu
> [mailto:elec-trak-bounces cosmos phy tufts edu] On Behalf Of Jerry
> Rhodes
> Sent: Thursday, January 03, 2008 11:20 AM
> To: Elec-trak Mail List
> Subject: (ET) Fw: E20 motor at 48V
> > I sure hope everyone is taking notes, this is the best lesson i've seen
>
> > on dc motors sense school, and has that been a long time ago, THANKS
> > Walt, question, is there a way to equate electric hp to ICE hp  i.e...a
>
> > 3hp electric to = to a xx hp ICE ??? my old brain recalls an old
> > prof'er at UWi saying 5.5 to 1  i.e... 3hp DC = 16.5/17 hp ICE or
> > about... I know it's not that easy....
> >
> > Jerry
>
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