Okey Dokey. On 6/21/08, Al Lococo <[EMAIL PROTECTED]> wrote: > Joseph, > > One Motor don't multiply. > > Cheers, > Al Lococo > > ----- Original Message ----- > From: "Joseph T. " <[EMAIL PROTECTED]> > To: "Al Lococo" <[EMAIL PROTECTED]>; "FLEAA Mailing List" > <[email protected]> > Sent: Saturday, June 21, 2008 1:06 PM > Subject: Re: [FLEAA] In-Wheel Motors? > > > > 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 >
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