[ausev] Dual electric motor questions

[m. edmund howse]

Hello Michael,

Welcome to the group. I'm kind of new here also but from what I've been 
reading I'm sure lots
of answers to your questions will abound. I can't help with the problems 
of torque but I can tell you Craigslist is a good source of donor cars. 
I've seen a lot of vehicles sell really cheap. But then there are also 
people who
want a fortune for a junker. My donor vehicles are a 86 toyota MR2, 86 
nissan stanza, 82 toyota landcruiser, and a 76 honda goldwing. Good luck 
with your projects.

Marv

Michael Bonard wrote:
> Hi,
>
> I am a new member of EVA - DC and I am preparing for a conversion using 
> a donor car (to be found..).
>
> I am looking for improving weight, reliability, and efficiency by 
> getting rid of the gearbox and differential: I would install two 
> electric motors (one on each front wheel). I would drive both motors in 
> parallel from the same DC-DC converter output. I am also looking for 
> using cogged belts to connect the motors to the wheels shafts.
>
> However, the following question came up:
>
> 1. How will the motors torque behave in a tight turn? Since the wheel 
> which is inside the turn will rotate slower than the outside wheel, the 
> inside motor will deliver a higher torque to this wheel while the outer 
> wheel will be driven with a lower torque..  I hope that his torque 
> difference will not be an issue in normal driving conditions. Is there 
> any member of this bulletin board with this type of experience who could 
> advise me before I commit to this configuration? I am pretty confident 
> that high speed turns will not be a problem (very low relative speed 
> difference between the wheels) but I have not been able to confirm this 
> SWAG.. Any recommendation would be VERY appreciated.
>
> 2. How will the DC to DC converter react to a dual motor load? Hopefully 
> it should not mind if I am not exceeding its rated amperes, but again I 
> do not have any confirmation.
>
> 3. Is there any member who could advise me on the cogged belt idea? I 
> think that it is lightweight, relatively inexpensive, very simple, 
> reliable, and allows a 3:1 or more "gear" ratio. I did some research and 
> found that today we have motorcycles and ultra light aircraft using 
> cogged belts passing 100 HP at 3000 rpm. This could be very promising..
>
> 4. What is the best "method" to find a donor vehicle with a dead engine? 
> I tried E-bay (not interesting, no dead engine to be seen) - and 
> CraigsList - a few hits only. The local wreckers claim they "never" see 
> a car with a dead engine (Hard to believe!). Any suggestion?
>
>
> Thanks for looking at these questions!
>
> Michael
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