Re: (ET) Power of Elec-trak motors?

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

FWTW guys, performance curves and data that I obtained from GE in Ft. Wayne
many years ago indicated that an E15 drive motor was rated at 1 HP, an
E20/C-185 drive motor was rated at 1.2 HP, and the snow blower's motor was
rated at 2.5 HP.  Technically GE referred to these as being stabilized 
shunt
compound wound field motors. 

I also have some performance data on the PM deck and drive motors from what
was known as Applied Motors in Rockford, Illinois way back then.  It
indicates the deck motors were either 1/4 or 1/3 HP, and the E10 drive 
motor
was rated at 1.25 HP.

Mike in KY  

-----Original Message-----
From: elec-trak-bounces cosmos phy tufts edu
[mailto:elec-trak-bounces cosmos phy tufts edu] On Behalf Of Christopher
Zach
Sent: Thursday, June 03, 2010 3:46 PM
Cc: elec-trak cosmos phy tufts edu
Subject: Re: (ET) Power of Elec-trak motors?

David Roden wrote:
> Interesting, but forgive me for saying that you're not quite answering 
> the

> question.  

> The OP wanted to know what rating of motor to use for drive and what for 
> mowing.  However, you've given the TOTAL power USED by BOTH the drive 
> and 
> the accessories under certain conditions.

*Right*. That's why I included 3 numbers, one to drive and mow, one to 
till, and one to do big things like blowing snow. Because if I put an 
electric motor on my Craftsman 15.5hp, there's nothing preventing me 
from buying a snowblower attachment and giving it a go.

However based on my Elec-trak experience and numbers, a 5hp electric 
motor would probably not be able to handle the constant draws of blowing 
2 feet of snow. That takes full power from the E20's main motor and full 
power from the blower mower to achieve.

> And remember, you don't need a 12hp-rated motor go actually GET 12hp.
Peak 
> power of an electric motor is several times its rated power.  I suspect a
2-
> 3 hp motor would be more than enough to drive a tractor.

True, but there is also a bit more drag on a normal garden tractor due 
to things like the belt drives, indirectly-driven blades, and all the 
pulleys for the clutches. So I'd err on a slightly larger size (5hp) to 
more closely match the E20 and make it a happy tractor.

Technically you can get away with a 5-6hp gas motor on a normal tractor; 
my guess is they put 15hp engines on them to allow the use of bigger 
attachments and because it's not too much more difficult to make a 
15.5hp single cylinder engine.

Chris

_______________________________________________
Elec-trak mailing list
Elec-trak cosmos phy tufts edu
https://cosmos.phy.tufts.edu/mailman/listinfo/elec-trak