Yes true, I did think all these things, though the car being light should reduce the required torque.
I wasnt aware electric cars had much in the way of gearing?
My overall aim is to spec an electric motor and its torque curve. In that sense i just need to know the maximum torque and power...
Im having a big issue with my calcs,
In order to accelerate my vehicle from 0-60mpg (0-26m/s) I use F=m(dv/dt), this is giving me a force of around 1000 N at the tyres, which translates as a torque of around 440 Nm which is way high!
My stats are;
M=410
Wheel radius=330mm (13 inch)
0-26m/s...
by counter rotate do you mean as in rotate about the centre of the vehicle (like a tank, with tracks moving in opposite directions to do a 360 spin).
If so then i think the best way to look at it would be to take a force couple, modeling the vehicle as a circle with tangental force components...
Thanks Blackcobra,
Almost Clever:
I think the main issue for this type of calc is the unknown values for efficiencies, this data is extrememly difficult to get hold of and the only realisitic way to obtain it is by having a chassis dyno.
Even with all this though, at high speeds and with...
Hi Everyone
Im doing practically the same thing, im designing a vehicle and trying to calculate the power required by its motor.
To do this i am using the following formula;
Tractive Force = Resistive Forces + Inertial Forces + gravitational forces
Resitive forces = Aero drag + Mechanical...
