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Well I tried to formulate the electric auxillary drive but getting a straight answer of potential torque for the motor seems impossible. Torque is linear and has alot of variables,too many for my brain to cypher. But the math I did was overcompensated to cover this anyhow.
So here ya go auto ninjas
1. Remove rear shaft of a transfer case. if it is slip yoke good luck sealing it up so should be internally held style, also concern with belt driven transfer cases are they have torque transfer issues 60/40 front to rear etc you will need to do some extra homework for them.
2. Purchase motor and drive to control it.
3. Determine gear ratio required, I have done a quick one "3.55/1 rear gears", with
" 195 70 14 tire" circumference aproximatly 78" new?? driven @ shaft speed of electric motor 1800rpm. = 498420 inches per minute approximatly. divided by 12 inches fer foot and 5280 feet in a mile times 60 minutes per hour. ok ya get the idea.
then factor in sprocketts or gears or pulleys...
4. Now decide how your going to use this if it is to only get up to speed then it is going to be different than if trying to keep @ speed after accel. or is it constantly powering vehicle throughout process. Most auto ninjas will say all the above and that will require serious engineering, luck, or endless trial and error.
5. The decision about use is important because controls must be added.utilizing the on, off, increase, and decrease buttons on cruize control make for nice Hiway rolling application. Newer vehicles with electronic gas pedal are great for the get up to speed variations add yourself a conveinient push button to turn it on and off. Electronic gas pedal switch can be added to a linkage style pedals also.
6. Design in a stop and emergency stop system. brake pedal works great for stop and is already wired into cruise control stop circuit. e-stop should shut system off though and should be in reach of the driver.
7. It is a motor therefore it is also a generator with all the proper parts in place, So how about a regenerative braking application?? here is where sophisticated electronic motor drives pay off because you can control regenerative brake application. instead of all on and off.
8. At some point you must decide how to feed you system so realize a good plan here will make all the differance on how you use the system and how many batteries you have in the car. How many amps your alternator requires to recharge etc. etc.
Did I mention all of this has some cost? a 5hp dc motor as I located was over $500 and this one would have probbably been just for testing as I dont believe it would have held up for more than a few months or so. Well I gotta go machine broke Just some food for thought people. trying to make your dreams a reality or something thats close LOL!
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