RE: 1-O-X revolutionary digital EV motor)

["Roger Stockton" <rstockton@delta-q.com>]

> -----Original Message-----
> From: owner-ev@listproc.sjsu.edu 
> [mailto:owner-ev@listproc.sjsu.edu] On Behalf Of Victor Tikhonov
> Sent: October 31, 2001 1:33 PM
> To: ev@listproc.sjsu.edu
> Subject: Re: 1-O-X revolutionary digital EV motor)

[snip]

> Sure. If you sit in EV1 all day long on the parking lot 
> running air conditioner and 500W stereo, and at the end of 
> the day move 3 miles before batteries go dead, you can 
> declare that EV1 was <1% efficient today.

Exactly; this is the limiting case, and is not of great interest, but it
does illustrate that the longer the car is running, whether moving or
not, the worse the range can be.

> This becomes academic and pointless debate because 
> experiments are not clean and conditions at which EV1 went 
> half its usual range are not exactly known and likely not 
> reflect real everyday life, (may be just that bad driving day).

Your last comment makes the debate meaningful: that you believe a 50%
range reduction might result just from a "bad driving day" suggests that
you accept that such large reductions *are* possible in "real everyday
life" without having to resort to the uninteresting case of running the
batteries down while parked.

The discussion started with the suggestion that the much lower
efficiency of the motor/controller combo at very low speeds might be a
significant factor in low stop-and-go range.  Peter counters that the
significance is unlikely to be great since low speeds imply low traction
power, and so low efficiency alone could not account for the entire hit.
I have suggested that the repeated 0-10 or 20mph accelerations required
in stop-and-go operation are a significant factor, especially in
combination with the reduced motor/controller efficiency at these low
speeds.  Someone else notes that the parasitic loads become more
significant the longer the vehicle is in operation.  Obviously nothing
can be "proved" through such a discussion, but if you think there are
other factors that could contribute to the reported range reduction why
not throw them out for consideration?

Cheers,

Roger.