I'm not talking about the overall efficiency of an EV. That would be very hard to calculate.
What I meant was that with all other factors the same, what would be more efficient to use, one motor or two motors? On 6/21/08, Al Lococo <[EMAIL PROTECTED]> wrote: > Joseph, > > FWIW, I am not an engineer. > > I don't think you want to multiply efficiencies in this case. Both motors > draw from the same source at their respective efficiencies. You should > multiply the efficiency of the charger times the efficiency of the battery > pack times the efficiency of the motor to get electrical efficiency. > > You also have mechanical efficiency of the drive train to take into account > if you have one. If you are driving the wheels directly, you eliminate > drive train efficiency losses and weight. > > There may be a decrease in efficiency of the battery pack with the load of > two motors. You wouldn't calculate that by multiplying motor efficiencies. > Check battery specs. > > The motors are probably slightly more than 90 percent efficient and the > battery pack is probably about 90 percent efficient. Check your charger > specs. > > Cheers, > Al Lococo > www.evprogress.org > > ----- Original Message ----- > From: "Joseph T. " <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Saturday, June 21, 2008 12:58 AM > Subject: [FLEAA] In-Wheel Motors? > > > > I've always thought that one motor is more efficient than two because > > if a motor is 90% efficient, when you have one, you'll have 90% > > efficiency. On the other hand, if you have two, you would only have > > 81% efficiency. (90% times 90%) Right? Is this correct? > > > > _______________________________________________ > > Florida EAA mailing list > > [email protected] > > http://www.floridaeaa.org > > > > > > > _______________________________________________ > Florida EAA mailing list > [email protected] > http://www.floridaeaa.org > _______________________________________________ Florida EAA mailing list [email protected] http://www.floridaeaa.org
