Put more silicon in the controller and bump up the motor size and/or
motor cooling. More amps = more torque -> no need for transmission.
They don't put multi-speed transmissions in diesel-electric train
locomotives. This is the most demanding application imaginable. A
transmission is only useful for cheaply matching the very ill-behaved
ICE to a driveline. If you have an electric motor and variable speed
controller of your own choosing, there is no economic or engineering
reason to add in a transmission. They just don't make any sense for an EV.
Transmissions are a vestige of ICE technology. In an ICE vehicle, you
_must_ have a transmission. There is no economic choice other than to
have a multi-speed transmission (or a diesel-electric drive system
like a locomotive.) Thus, folks tend to carry over that belief that
they are a necessary component on _all_ vehicles. Simply not true.
Bill D.
At 03:55 PM 12/1/2015, you wrote:
I presume that the two-speed transmission is the required HIGH/LOW
gearing for off road vehicles, AKA Highway / Crawl gearing.
Cor van de Water
Chief Scientist
Proxim Wireless
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-----Original Message-----
From: EV [mailto:[email protected]] On Behalf Of Rick Beebe via
EV
Sent: Tuesday, December 01, 2015 11:42 AM
To: Electric Vehicle Discussion List
Subject: Re: [EVDL] EVLN: Red Auto-Tech aims Oz-built rugged
electric-SUV r:120mi
On 12/01/2015 01:00 PM, EVDL Administrator via EV wrote:
> On 1 Dec 2015 at 5:34, brucedp5 via EV wrote:
>
>> powered by ... four in-wheel motors, and a new two-speed
transmission.
>
> Eh? Leaving aside the well known (though apparently not to these
folks)
> wheel motor problem of unsprung mass, why would they need a
transmission
> with wheel motors?
I noticed that too. And an off-road vehicle is probably the worse place
for heavy wheels.
>> Van de Loo predicts funding will come from the private sector until
>> the car maker is able to hold an initial public offering.
>
> Yeah, so have hundreds of other EV startups. Good luck with that.
Agreed.
>> ... range of over 120 miles ... base price of [US}$60,000 ...
>
> Maybe I'm missing something, but I don't see a market for this EV.
Probably not but lots of Australia has plenty of sunshine and a dearth
of road. And gas is expensive. So it may have more appeal than most of
us in the US think. But I think that price is probably a deal killer
especially for something you're going to go trashing in the outback.
--Rick
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