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RE: (ET) RE: EVLN(42v Li-ion ICE batt, mild hybrids: as an EV forshort di stances)
- Subject: RE: (ET) RE: EVLN(42v Li-ion ICE batt, mild hybrids: as an EV forshort di stances)
- From: Larry Elie <lelie ford com>
- Date: Mon, 24 May 1999 16:29:41 -0400
- Sender: owner-elec-trak cosmos5 phy tufts edu
From: Hazen, Dwight L[SMTP:hazen indiana edu]
Sent: Monday, May 24, 1999 2:42 PM
To: 'Chris Meier'; 'darrylmcmahon igs net'; 'elec-trak cosmos5 phy
Cc: 'jnaab indiana edu'; 'plaue net66 com'; 'amirza indiana edu'
Subject: RE: (ET) RE: EVLN(42v Li-ion ICE batt, mild hybrids: as an
EV forshort di stances)
;I think the Headlights are tapped to the battery pack at the 12 volt
They are. The problem is that this causes two batteries to be lower than
which cuts the 'range' (cutting time) for the tractor.
;The electric winch ( Delco, car wiper motor) is six volts connected to one
;six volt battery. I am looking to replace the headlights with some sealed
Nope, it is 18v, connected to 3 batteries.
;beam units. They now make rectangular replacement units for cars that
;Air Conditioning for the ElecTrak with the snow cab.. What a concept!
I have to watch it what I say here. I know people on the 42V committee
(it is multi-company)
and others testing the devices. Yes, there will be 42V/12V systems soon,
42V systems later. Yes, the wires to the devices will be smaller/lighter
and will save some
weight. Now I will part the waves from what is normally believed; a 42
volt motor to drive a
given torque at a given RPM will be essentially the same size and weight
as a 12 volt motor
that drives the same torque and RPM. Yes, the wires ARE smaller, but
there are more of
them to get the new voltage drop. The packing efficiency drops with the
smaller wire, and
the package for the 'new' device is essentially the same. That is not the
official Ford line,
but it is the truth. The torque and RPM are governed by the field, and
for all practical, efficient
motors, that is limited by the product of how many turns of wire you have
times the current in
each wire. The wire size is determined by the voltage drop at the
operating temperature, which
depends on how much current you can pass through the wire. The fastest
way to reduce
mass and size is to reduce air-gaps between the armature and the field
windings, but that
depends on bearings and temperature ranges. 42 V will happen, but it
isn't a fantasia. It will
happen mainly to reduce the size/mass of the wiring harness going to each
device, and for the
starter/alternator packages. I know this goes against the popular press.
Ford Scientific Research
Dwight L. Hazen, Indiana University, UITS
Bloomington, In. 47408-7378 812-855-5367 hazen indiana edu
http://php.ucs.indiana.edu/~hazen/ ax25 wb9tlh k9iu in noam
> -----Original Message-----
> From: Chris Meier [SMTP:ChrisM pptvision com]
> Sent: Monday, May 24, 1999 1:48 PM
> To: 'darrylmcmahon igs net'; 'elec-trak cosmos5 phy tufts edu'
> Subject: (ET) RE: EVLN(42v Li-ion ICE batt, mild hybrids: as an EV
> for short di stances)
> And we might have to add another 6v block to our Electraks to
> jump start ICEv's! Then upgrade the headlights to 42v units...
> Anyone have one of those driver enclosures for the Electrak?
> Pretty soon you'll be able to add a 42v air conditioning unit.
> > -----Original Message-----
> > From: darrylmcmahon igs net [SMTP:darrylmcmahon igs net]
> > Sent: Sunday, May 23, 1999 10:44 PM
> > To: ev listproc sjsu edu
> > Subject: Re: EVLN(42v Li-ion ICE batt, mild hybrids: as an EV for
> > short distances)
> > Bruce posted:
> > <snip>
> > > Electricity to take on bigger role in autos 42-volt systems offer
> > more
> > > power for automated features May 20, 1999 BY WILLIAM DIEM SPECIAL
> > TO THE
> > > http://www.freep.com DETROIT FREE PRESS
> > >
> > > PARIS -- The first cars with 42-volt electrical systems, not 12,
> > could
> > > reach showrooms early in the next decade. Under the hood, wholesale
> > > changes would take place.
> > Once again, the major automakers are learning what the EV
> > industry knew 80 years ago. Just tonight I was looking at a
> > schematic for a 1915 Milburn, and it used a 40-volt accessory
> > system - pack voltage.
> > So the automakers are excited about getting rid of fan belts and
> > replacing them with small motors and powering valve actuators
> > electrically, because at 42 volts they can do it, and it will be more
> > efficient. Be even more efficient if they didn't need a water pump,
> > radiator fan, fuel pump, and valve actuators to be powered in the
> > first place. (Oops, my bias is showing.) On the up side, sounds
> > like a great source for air conditioning systems that should be easy
> > to retrofit onto our existing EVs.
> > Darryl McMahon 48 Tarquin Crescent,
> > It's your planet. Nepean, Ontario K2H 8J8
> > If you won't look Voice: (613)828-0805
> > after it, who will? Fax: (613)828-3199
> > http://www.igs.net/~darrylmcmahon