Dual BL

[Smib]

Now I want to apologize right away because I know this was addressed in another thread, but I can't find it. I was wondering if it is possible to use two motors with one esc. I doubt it, but don't really know why. So if someone could explain why I really appreciate it.

Thanks.

[Demon-TC3]

i personally dont see why you would need to use two brushless motors with one ESC, the ammount of power those things have is just insane and by adding another motor your just killing efficiency and adding weight.

but to answer the question as far as i know it wouldnt work with a sensored system at all and might work with a sensorless...may overpower speedo though.

as far as i know thats about right, may be wrong though.

[Smib]

That's what I was thinking. I want to use two motors because I am interested in torque more than speed. I am also considering one big higher turn motor, I just want to consider all things. And two motors looks better than one any day.

[Demon-TC3]

depends on the application, i personally wouldnt be able to justify two motors just because it "looks" better...and persides with a shell on what difference does it make?

as for torque if your running one of the Feigao motors on 12cells with a single motor you will have smooth running, to run two motors you will need more cells if you want descent run time. personally i would get a Feigo 540c 9XL or 10xl (if they exist) and gear it low to get the torque you need.

As i say though the 8XL have enough torque to get the monster trucks to pop wheelies and thats almost 5KG worth of truck!

[Rtsbasic]

The two motors would likely just confuse a sensorless esc, two motors of the same make & model aren't exactly the same, so even with two idential motors running off the same drive gear, the esc will get different readings from the motors, which could cause Bad Things™, and could let the smoke out the esc eventually.

[tcolesen]

You could do dual motors on dual ESCs running off the same set of batteries, but anything other than that and you could be asking for trouble.

With brushless, torque is put out as it's needed. If your application requires a lot of torque, then the motor will pull an amount of current based on the torque requirement (torque is proportional to current). If your batteries can't supply the current, then the motor can't put out the torque.

Dual brushless motors are less efficient than a single. So for any given amount of torque, dual motors require more current. You would need a larger, heavier power source for that, and a heavier power source means more weight to move around, requiring more current. Simply put, single BL is MUCH better than dual.

[Smib]

Ah, fine then. :p Thanks for the info guys.

[NoLaD]

If you're worried about torque. I could point you towards setups that will simply shred the drivetrain the first time you go wide open.

To restate tcolesen main point, single BL is much better than dual in any senario.

HiAmplidude ran dual brushless along with a few other guys, and that was mainly to see if it was worth it. Bottom line, if you're willing to be two mediocre setups, you should just opt for one top of the line setup.

[pinolelst]

from what I've read 2 brushless on same spur gear with a single esc is a no go .Something about the rotors being out of sync .
2 matched brushless on seperate drives OK with two caveats...they must be powered by a common battery pack so each motor sees the same voltage and they each need their own speed control.
pinolelst