Re: 'Coming in on a Plate and Prayer'

["David Roden (Akron OH USA)" <roden@ald.net>]

On 28 Jan 2002 at 23:16, Bruce Parmenter wrote:

> Rather than freezing my tush, I though I would chance it, 
> and be very careful to draw as little current as possible.
> 
> Being late at night (9 pm) does not mean there is less
> traffic. But it was down hill most of the way. Instead of
> starting in first and changing up to second at 15 mph, I
> would start in second, and change up to third at 10 mph.
> This shifting up early worked well for me. 

Now, that is very odd!  In every DC EV I've driven, shifting early makes 
the motor draw ~more~ current from the batteries, not less.  

Presumably your goal was to use less current, and you seem to be saying 
that your motor used ~less~ current at a lower rpm.  That would seem to 
indicate that your motor's back-emf ~drops~ as speed increases, the exact 
opposite of what one would expect.  

I thought you had a conventional series motor, but maybe not.  What kind 
of motor and controller do you have?  Have you gotten your hands on 
something unusual and exotic there?


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David Roden - Akron, Ohio, USA
1991 Solectria Force 144vac
1991 Ford Escort Green/EV 128vdc
1979 General Engines ElectroPed 24vdc
1970 GE Elec-trak E15 36vdc
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