Re: Wheel motors - too good to be true?

On Mon, 3 Jul 2006 02:51:21 -0400, "Paul E. Schoen" <pstech@xxxxxxxxx>
wrote:

The following is from a "Voltage Forum":
http://tinyurl.com/ogvr7

I checked the company website:
http://pmlflightlink.com/motors/wheelmotors.html

and found specs for their wheelmotors which seem reasonable enough
http://pmlflightlink.com/pdfs/eWheel.pdf

However, the power specs for the car seem way off base for any of the
listed wheel motors or any known technology, AFAIK. Particularly, the
assertion of 160 bhp per wheel. The torque of 750 N-m (552 ft-lb) is close
to the advertised maximum spec of 640 (160 cont), but the power is 14.4 kW,
or about 20 HP, at 900 RPM. I think somebody mistook the 160 Newton torque
for bhp, and ran crazy with it! Do you think the acceleration spec is
believable? An actual total torque of 2200 ft-lb for a 3600 lb vehicle,
with 24" dia tires, would provide about 0.7 G, and 0-60 in about 3.5
seconds.

So, aside from the overblown HP hoopla, this still looks like an impressive
vehicle. It's a shame they still feel a need to design and advertise so
much on the basis of raw HP and amusement park acceleration. It looks like
they could have made a still impressive car with half the power and perhaps
120 MPG, which would impress me a lot more than burning rubber.

Paul
SNIP

CSIRO developed a wheel motor having 98% efficiency for use on solar
powered vehicles in the Darwin - Adelaide Solar Car Challenge. I
checked out the cost a couple of years back and from memory the cheap
version was some AUD50K and the expensive version was about AUD70K.

http://www.csiro.au/csiro/content/standard/psz7,,.html
.

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