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RE: (ET) newbie
- Subject: RE: (ET) newbie
- From: Larry Elie <lelie ford com>
- Date: Mon, 7 Jun 1999 14:29:50 -0400
- Sender: owner-elec-trak cosmos5 phy tufts edu
Steve, I'm puzzled here....
In your reply to Jeff, you mention...
; 4. Except for light use the 3 hp golf cart motor will probably be too
;light. Light use would be mowing so long as the mower deck had its own
;motor set. Even the GE E15 and E20, which had 1.5 kW and 1.8 kW constant
;duty traction motors used separate motors for accessories. If you simply
;replaced the gas motor with an electric you'd have to size it for
;simultaneously powering the traction and accessory loads.
I agree with your whole post, but 760 Watts mechanical is 1 HP, and with a
conversion efficiency, a good electric motor will do 1 Mechanical HP on
1000 Watts or
1 kW. I do not know the designed duty cycle for the GE, but might 1.5 &
1.8 kW be
a bit wimpy? Or was it supposed to be 15 and 18 kW?
BTW, for a good belt-controlled gear transmission, the efficiency is 90 to
95%, for a
hydrostatic it is 65 to 75%, the losses are to heat. A hydrodynamic
is about 80 to 85%, and a few were used on large Case farm tractors in the
efficiency penalty is why you never see a hydrostatic on anything but
garden tractors or
bulldozers, where the speed control ability outweighs the efficiency
penalty because you
can get your job done quicker.