Dual brushless motor questions

[Jbreddawg]

Is it possible to run dual brushless motors from one speed controller ??
These are the motors

http://www.tcscrawlers.com/BM17-Brus...g-p-16457.html

Currently I have a MM "will have 2 shortly "
A quark Monsterpro125
and An MGM 16018
I would prefer to only run 1 speed controller but purchased the second mm just incase .

[brushlessboy16]

Not a good idea, the power distribution will be fine but when the esc gets 2 EMF pulses it might spaz out and commit suicide, it will basically screw timing of the motors and self destruct

[lutach]

Originally Posted by Jbreddawg

Is it possible to run dual brushless motors from one speed controller ??
These are the motors

http://www.tcscrawlers.com/BM17-Brus...g-p-16457.html

Currently I have a MM "will have 2 shortly "
A quark Monsterpro125
and An MGM 16018
I would prefer to only run 1 speed controller but purchased the second mm just incase .

You should ask GriffinRU this question. He says it might be possible.

[E-Revonut]

If it slows-Recharge it,
If it Heats-Regear it,
If its brushless-Fear it!

I like the signature BLBoy

[brushlessboy16]

Originally Posted by E-Revonut

If it slows-Recharge it,
If it Heats-Regear it,
If its brushless-Fear it!

I like the signature BLBoy

Thanks e-revonut :D

[BrianG]

IIRC, you have to sync them up so the back-EMF pulses are in sync. I believe this involves putting a AA battery momentarily across two wires to rotate the rotor to a set position. Then do the same to the same two wires of the other motor. Then hook each respective wire from each motor together. And finally hook them to the spur. Do all this without changing the rotation AT ALL. Kind of a PITA IMO.

You are effectively halving the coil resistance so instead of say, two 8-turn motors, you are running the equivalent of a single 4 turn motor. You'd have to be very careful with gearing depending on the motors you are using.

Personally, instead of spending $55 x 2 for the motors you linked, why not get a single properly-sized motor?

[Jbreddawg]

Personally, instead of spending $55 x 2 for the motors you linked, why not get a single properly-sized motor?

Well, because R/C is like drugs !! You just cant get enough !!
Heres the deal . I bought a Gmade Scorpion today . Like I needed "another " truck .The motors I linked too are already installed. I already have a MM and he ran it on two MM's so I also bought 1 of the MM's from him.
So, at this moment " I dont have the truck yet " I will have the two mm's to run the two brushless motors the correct way.
I was just hoping or wondering I guess , If it was possible to run them both from one controller ?
Now wheres that heroin ?

[_paralyzed_]

go two sidewinders and save the mm for bigger projects

[Jbreddawg]

I just bought another MM to use . I dont want to buy 2 more esc's

[brushlessboy16]

So your planning to run 2 motors on seperate axles? or on a common spur, if they are on different axles it wont work

[Jbreddawg]

2 seperate axles

[brushlessboy16]

yeah that wont work, srry man.. one you turn or run over a bump and the motors get out of sink ur esc will commit suicide

[_paralyzed_]

i can't imagine it being any different than running a brushless rustler and hitting a bump, the esc will compensate for bumps, jumps, crashes and rollovers, I don't see why two seperate systems wouldn't each just take care of themselves. I can imagine a dual sensored system perhaps screwing up, but he's running sensorless. I'd run them off the same battery so they recieve equal voltage, and they should be ok. Every time I've read that you can't run dual brushless, I'm pretty sure it has been written by somebody that has never ran dual brushless. The traxxas forum kids have proven dual brushless, without syncing motors, and although they share the same spur, without exact tolerance for each gear mesh, they aren't exactly the same, I'm willing to bet there are a bunch of crawler guys with clod type axles that have ran dual brushless. All that being said, I've never ran dual brushless, but I sure wanna try on a traxxas slash with a 4wd stampede type upgrade, I'm going to go look on crawler forums for dual brushless setups

[DrKnow65]

He's talking about using 1 ESC with syncronized motors _P_, if you did it on seperate axles the 1 ESC would fry when the motors lost sync.

With 2 ESC's it's no problem.

I don't see why two seperate systems wouldn't each just take care of themselves

right right. But that wasn't the question. What he was getting after was if he could run two motors of one ESC. We've found that it might be possible, if the motors are timed the same and locked into position against the spur so they can't "jump timing". However, if the two motors are on seperate axles, there is nothing to hold them in time. A bit of wheel spin in the front or rear, and suddenly the motors are out of time. Poof goes the ESC. With 2 ESC's and 2 motors, it's definately possible.

J.