Re: 1-O-X revolutionary digital EV motor

["VanDerWal, Peter" <vanderwp@fhu.disa.mil>]

> Consider the AC Propulsion graph; they don't even bother showing what
> happens below 1000RPM and yet if you look closely at the tightly spaced
> lines in that area you will already see numbers like 63%.  Just like a
> cliff on a topographical map, the closely spaced efficiency lines in
> this area tell you that efficiency is falling like a rock and could
> easily be in the single digits by about the 200RPM mark.
> 

The problem is, you are looking graphs of how the motor performs at full
operation voltage.  Chances are when you are cruising around at 10 mph,
you're not going to be cramming full pack voltage into the motor.

For DC motors the charts change, with the max efficiency point moving
towards zero RPM, as you reduce voltage.  Granted the max efficiency drops
at lower voltage, but it's still going to be better than what you're reading
off the full voltage chart.

For AC motors things get really hard to tell since they change voltage,
frequency, phase angel, etc, etc.

You really need to find a three dimensional chart to get the full picture.