dual motor question....

[chvman]

Just curious about something guys. I read somewhere (another forum) about people running dual motors on speed controls that have motor limits. Example : the esc has a motor limit of lets say 15turns and as long as you wire (2) 15turn motors in parrellel than it's not a proplem. Have any of you guys heard this? I was always under the impression that you needed an esc with "no motor" limit. Hence why I bought a Super Rooster for my truck. But I'm working on a project now that if I could use something else like the Dura Trax esc I have for a little while rather than dump coin on another Rooster that would be great. Thanks in advance for any info.

 

[joe]

when you run dual motors in parallel, you double the load on the speed control.
basically, you divide the turn number by two.
so if you want to use two 15 turn motors, you need an esc that can handle 7.5 turns.
This way will give you faster speeds but shorter run times

(Positive wire from speed control goes to the positive tab on the first motor.
Positive wire then goes from the positive tab on the first motor to the positive tab on the second motor.
Negative wire from the speed control goes to the negative tab on the first motor.
Negative wire then goes from the negative tab on the first motor to the negative tab on the second motor.)

:burn




if you run dual motors in series, you put the same load on the speed control as the total number of turns in both motors.
in this case you just add the number of turns together.
so if youre running 15 turn motors, its the same as a single 30 turn motor.
This way will give you more torque and longer run times.

(Positive wire from speed control goes to the positive tab on the first motor.
An extra piece of wire then goes from the negative tab on the first motor to the positive tab on the second motor.
Negative wire from the speed control goes to the negative tab on the second motor.)

:trk

 

[HawnMT]

When running 2 motors in parallel you just divide it. I have a Wild Dagger that runs 2 stock siver cans(27T) in parallel. So 27 divided by 2 = 13.5. So I should use an esc that can handle a 13.5T motor but I actually run it with a Traxxas XL-5 which is a 15T esc with no problems.

 

[chvman]

Thanks HawnMT that morks more sense to me. I just wasn't sure.

 

[carcrusher]

turn limits are all relative - its tough to judge just what will work without having actual amp ratings.

lrp states that if their esc has a limit (ex 13 turns) then for dual motor application you have to add 2 turns (ex - two 15's in parallel will work). im not sure how that is supposed to work, but they stand by it.

your motor timing makes a difference too - 13 turn motors set at 20 degrees are going to draw a ton more amps than 13 turn motors set at zero degrees.

like i said, it's all a relative thing.

 

[HawnMT]

^^^^that makes even more sense.:tmb

 

[joe]

he guys, fixed my original answer...
i gotta proof read better!
sorry 'bout that chvman.
now its right.

 

[Hardcore]

My friend uses a Tamiya Wild Dagger with some masher 2000's and 20t pinions
He also uses a 7 cell battery
The motors he uses are 2 x 28turn stock stylle 540's (ansman racing?)
He runs them both with an Mtronics RV Max no limit esc. When climbing sandy hills a lot though it can get really really hot, even though it apparently has a 6turn motor limit