Dual Motors

JDM-R34 · Post by **JDM-R34** » Fri May 28, 2004 4:08 pm

Do Dual motors increase speed or just slow You down and add weight,
Here's the site that had pictures of it done: http://www.age.jp/%7Eex2/bit/11_custom.html

And here is some pictures:

JDM-R34 · Post by **JDM-R34** » Fri May 28, 2004 8:27 pm

Has anybody ever tried this before?

Would the second motor act like a turbo and make the speed increase, What do Ya'll think?

sg219 · Post by **sg219** » Sat May 29, 2004 12:11 pm

I think it would slow you down, unless the 2nd motor ran exactly the same RPM's. If it didn't, one motor would be restricting the other. Plus, the power loss, single cell--two motors? Dual cell--two motors, maybe.

Trial and error.......then sucess!

I'm doing that now with some stuff, but its more on the error side right now.

Trial and error that is, not the dual motor thing....

JDM-R34 · Post by **JDM-R34** » Sat May 29, 2004 12:39 pm

So what do You think would happen if Your first motor say was a 3.8, and lets say the second motor on top was a 4.2, do You think it would be faster, or would they have to be the same type of motors?

hogjowlz · Post by **hogjowlz** » Sat May 29, 2004 12:42 pm

i think youd want at least one to be a really high rpm motor and maybe the other a high torque?

JDM-R34 · Post by **JDM-R34** » Sat May 29, 2004 12:45 pm

On the website that I got those pictures off, it's in Japanese so I can't read what is says about this Mod. I guess it could be just like a turbo (kind of) if You can figure out what type of motor set up is required to get the most speed out of it, it would be a cool modification for anybody who focus' on speed.

Monouk · Post by **Monouk** » Tue Jun 01, 2004 3:00 pm

Dual motors dont increase speed. However, they almost double your torque. Ive seen alot of different methods, but they are usually somthing like zipties. I tried a different method (Im ganna start selling them soon too.)

http://www.microrccenter.com/forum/inde ... 25199&st=0

hogjowlz · Post by **hogjowlz** » Tue Jun 01, 2004 3:07 pm

welcome to the fuckin hood monouk. nifty shit ya got there.

hue35 · Post by **hue35** » Tue Jun 01, 2004 3:43 pm

Fuck yeah, dude... that dual motor shit is off the fuckin' hook. Looks like it's got torque comin' out its asshole... prolly pops wheelies like a motherfucker.

Monouk · Post by **Monouk** » Tue Jun 01, 2004 4:11 pm

Word.

JDM-R34 · Post by **JDM-R34** » Tue Jun 01, 2004 4:11 pm

yea, but does anybody want to try to do it? I mean it shouldn't be that hard but a dual cell, dual motor, MOSFET, Bit with a 4.2 or 4.8 motors would be fast as crap and pimpin to,

Monouk · Post by **Monouk** » Tue Jun 01, 2004 4:18 pm

You gatta be careful with the higher turn motors. If you run 3 or 4 cells on the 4+s, youll burn em out real fast. However, put some 1s or 2s doubled, tricell, fetted, with a gear ratio as close to 1:1 as possible...now that is pimpin...

hogjowlz · Post by **hogjowlz** » Tue Jun 01, 2004 4:21 pm

anything over 2 cells is pretty uncontrollable unless you stretch it beyond scale. i never got around to running dual motors cuz i get enough torque out of one. what are you guys trying to climb?

sg219 · Post by **sg219** » Tue Jun 01, 2004 4:37 pm

Welcome Mono......Have a fuckin' great stay!!!

ph2t · Post by **ph2t** » Tue Jun 01, 2004 5:20 pm

hey monuk, welcome dude....

JDM, I have done this. the key is to NOT both both pinion's on the same side. The torque spins become just insane and due to no proportionality it makes the car almost useless.

I put two gears on the main axle. one on each side. the motor mount area was modded to allow the extra gear to fit and spin freeley. the motors are mounted opposite to each other. due to this config they are wired in parallel. and opposite. ie: the case of one motor is connected to the end pin of the other motor and vice versa. this only works well with a mosfet modded h-bridge, two reasons why. 1) the amount of loss in the regular pcb is too much so therefore there's not enough current to get the motors up to an acceptable level of torque. 2) since the motors are in parallel this effectively HALF's their resistance and therefore DOUBLING the current going though that part of te h-bridge.

this setup ran fine on a single cell. the torque was insane! I stopped any futher mod's on this project 'cause I had issues makeing the top motor stay put.

if you have any extremely low ratio gears (4:1 or close) this is the mod to use them on....

As for motor speeds, it aint a complex situation. basically when two motors are driving the same axle they will balance out to a speed that is between them. this will happen with motors that are closely rated... ie: don't put a 2.2 and a 3.8 together, that's just silly. I'd put to 4.2's together. the reason why is that they are fast motors with bugger all torque. together yo should get the same (or close) speed but waaaaaaaaay more torque.....

i've got some pics somewhere..........

ph2t.