One esc two motors - RC-Monster Forums

coolhandcountry · **One esc two motors -** 03.29.2006, 06:40 PM

If you try to run two brushless motors off one esc how would do it. I do know you have to get the motors in sync with one another. How would you go about doing that? I know you have to watch that the two motors don't draw to many amps as well. I am not sure there would be an advantage to this but it is worth testing.

Sylvester · 03.29.2006, 07:33 PM

I dont know, but if you have 400$ to test than please do so, but i think that the 2 motors will overheat the controller, and timing the motors wont be such a easy cookie either.

coolhandcountry · 03.29.2006, 08:41 PM

the over heating does no bother me. The timing of the two does. I am not sure how to go about timing them.

Serum · 03.30.2006, 06:55 AM

It can be done, as long as they are 1:1 mechanically connected. (thru gears or something)

You can position the rotor by using a small DC power supply or a mild power delivering battery (no 20 cells GP3700's) and connect them to two of the wires of the motor, do the same with the other, and the rotor is positioning itself into the right position. As long as they are equal.

coolhandcountry · 03.30.2006, 12:20 PM

OKay. I got you. I was thinking about that but wasn't sure if it would work out. I am thinking of trying a couple of 14l on a 36120 if it don't sell. I will let you know more later. Thanks rene.

Tazz · 03.30.2006, 02:06 PM

Here is a setup with brushed motors.
http://www.ultimatetraxxas.com/i/ema...ompartment.jpg

Serum · 03.30.2006, 02:38 PM

Brushed differs a lot in this Tazz.

Brushless isn't working on the DC that normal brushed motors do, they work with a complex controller, that divides the DC over three phases using a puls width modulation (PWM)

A stock e-maxx uses two parallel motors on one controller too.

coolhandcountry · 03.30.2006, 02:46 PM

That is cool but not the same like rene said. How many volts should i use to get the rotors lined up. And does it matter if I have the north and south pole part of the magnet the same.

Serum · 03.30.2006, 02:53 PM

Yeah, you need to keep the + and - of the batteries the same, that is essential. as is using the same wires coming from the motor!

that way only will make the rotors line up alike.

Just start with 2 AA batteries in series. my guess is these will do the job.

coolhandcountry · 03.30.2006, 03:01 PM

OKAY!!
Sounds like we may have a go plan. Hmmm. I need another 14L for this project. I guess it if don't work I can get another 7020 and run twins on it. :D :027:

GriffinRU · 04.02.2006, 12:32 AM

It would work only with the same motor (size/turns).

You do not need anything, just connect motor wires together and spin one motor shaft, another will follow. Then mark both shaft with permanent marker or make a scratch. Now you set to run them both from one ESC.

Do not worry about overheating, because now both motors will work half the previous load. But if you plan to push the limits you should select ESC based on twice the current ratings of both motors.

Dual BL from single ESC works the best with sensored setup. In sensoreless applications in some cases you will have problems with glitches on low RPM and start due to the fact of not precise matching of both motors. And motor shafts secure connection is the must.

Good Luck! Done that – Love it! You should to :)

Artur

coolhandcountry · 04.02.2006, 07:56 AM

How could I go about getting them more precise aurtur? I am planning on a couple of 14L for this and they rated like 44 amps. I think I will give it a go.

GriffinRU · 04.02.2006, 09:24 AM

Quote:

Originally Posted by coolhandcountry

How could I go about getting them more precise aurtur? I am planning on a couple of 14L for this and they rated like 44 amps. I think I will give it a go.

When you connect them via spur and pinions together, they should spin freely without any hesitation. If not then you need to move 1-2 tooth left-right until that happen and for identical (14L and 14L) motor you should track each-other very good; precisely I will say. You should be fine with 14L, startup problems with higher inductance motor should be less visible.

Artur

coolhandcountry · 04.08.2006, 03:45 PM

Well I was setting around and pulled out the 14L motor. I took a single aa battery and touched two wires on it. The rotor positioned itself. I turned it half a turn and did it again. It went back to the same position. I think this may be the best way to line them up. 1.2 volts is more than enough to align them up. Now I jsut need another nemisis motor 14L.

GriffinRU · 04.08.2006, 04:20 PM

Quote:

Originally Posted by coolhandcountry

Well I was setting around and pulled out the 14L motor. I took a single aa battery and touched two wires on it. The rotor positioned itself. I turned it half a turn and did it again. It went back to the same position. I think this may be the best way to line them up. 1.2 volts is more than enough to align them up. Now I jsut need another nemisis motor 14L.

You still need to solder two motors together :)
Once you do that no batteries will require for matching...

Artur