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T-maxx transmission with brushless motor
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Charles
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T-maxx transmission with brushless motor - 10.24.2008, 10:16 AM

Hey guys, I've been running a brushless setup for 5 or 6 years with an E-maxx transmission in a little chassis I made about 10 years ago. It was based on Clodbuster axles at the time, and is now based around another Tamiya axle, the Txt-1/Juggernaut design.

Anyway, the latest setup is a shulze speed control running 14 cells through a Hacker B50 9L. It has plenty of power and it took quite a while to get the driveline robust enough to hang in there long enough to be any fun.

However. The driveability of the brusless setups has always left something to be desired in the way of slowly easing forward (like for crawling over obstacles) and quickly changing from reverse to forward and vice versa. Also the cogging with decent timing advance is just not desirable. It can be minimized, but the machine will never ease around like a brushed setup.

And because of the brutal power output I have always just dealt with these relatively minor things.

However:

What if instead of asking the brushless motor to stop and start, reverse and then rotate forward again constantly while traversing an obstacle, we instead just pretended it was a gas engine?

What if you just had it set so that it would always be spinning slowly at an rpm where no cogging would ever take place and let a clutch similar, if not the same as for a nitro engine, attached to the shaft. Then the motor could just "idle" there, ready to rock on a moment's notice.

And as you slowly increased the power with the speed control, the rpm would increase and the clutch would start applying torque to the transmission and you could ease over obstacles without any cogging, and without having to go faster than you wanted.

Then to reverse, just use the reverse in the T-maxx tranny. It would shift from 1st to 2nd on it's own just as designed as well.

Just seems like the brusless motor might perform better from a driveability standpoint if it were allowed to just sit and idle and then apply power and reduce power but never have to actually stop and reverse all the time.

A side benefit would be the ability to use a much cheaper non-reversing speed control, and non braking (as the braking will be done via the disc brake on the transmission).

What do you all think?

I would love a little torque converter in there. But I think a nitro car clutch would work.

Last edited by Charles; 10.24.2008 at 10:21 AM.
   
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