posted on Jul, 31 2004 @ 02:16 AM
Electric motors have a torque curve inversely proportional to rpm's.
The lowest rpm's have the highest usable torque, and the highest current demand on the power source.
Starting and stopping as well as doing 60 in under 5 seconds, will extremely tax the storage system and reduce overall miles-between-charges. I
suppose a flat road could be used to get the mileage numbers, while a 1/4 mile track can be used to get the acceleration numbers. But I doubt you can
the best of both worlds. The numbers at the site are a nice sales pitch but do not reflect the facts as they should be presented. I especially hate
the horspower rating thrown around like it means the same to an electric motor. It reminds me of the stereo-a-rama's that are at the motel meeting
rooms, selling 'peak-playing-power' amps like it is RMS.
Although it is a snazzy looking vehicle, it is only constructed using existing technologies, and does not provide any new solutions to electric car
Basically it seems that they are using a common industrial ac motor inverter. (you need to know these fail, and power-IGBT's are NOT cheap to
replace.) The charger converts the ac into dc for the batteries. The ac motor inverter normally would operate off ac, but some simple mods can be made
to operate from dc, as this is the first thing an ac motor inverter does anyway, convert to dc. (and note the ad suggests an integrated 100 amp power
supply in the inverter, this implies a modd'd ac inverter that was off the shelf, as all ac motor inverter's use large capacitors as 'headroom'
Regenerative braking?...that is a standard feature of most ac motor inverters, and all it does is shunt power generated by the motor/vehicle inertia
via the drive motor's back to the batteries, after some loss is applied of course.
Trust me I have always wanted a cool looking car that was very fast, sqeals tires, and gets 100+mpg (or electrical equivents),..
but this car isnt it.
edit,...just to add that the power factor corrected charger, well that could simply be switching in a couple of capacitors to the motor and using it
as a common 3-phase generator, powered by single phase ac. Again, 20 year old technology packaged in a bright yellow sportster.
[edit on 31-7-2004 by smirkley]
OK last edit to add something else I wanted to append here,...after looking at the tech pages I can say assuredly that this car is powered from
modified but common technologies.
The drive motor may be as elaborate as a vector motor, but after reading all the wonderful and distracting words and numbers, I doubt it, and still
think it is just a common 3 phase ac motor, driven by a modified ac motor inverter, and the re-charger is just switching in a couple of caps on the
motor, and using single phase to spin the motor, giving it a regen-effect even while the car is not moving.
This car, as well as many other's out there, have provided me with much disappointment, as people find flashier and tech'ier ways to sell high
priced stuff that does not provide the spec offered. In this example, you could put mazaratti body on a vw frame and driveline, but it is still just a
vw at heart. (analogy)
[edit on 31-7-2004 by smirkley]