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Need help on running dual brushed motor with single ESC setup

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Need help on running dual brushed motor with single ESC setup

Post by wyetuck88 on Wed 26 Sep 2012 - 23:24

Hi guys, Need your help here, I have decided to run a dual Brushed motor setup, I have read that the turn of a motor will be divided into half if running from a single ESC, meaning to say a twin 20-turn motor will be split into 10 turn each.

Is it possible to run two brushed 20-turn motor on my 320A china ESC, will there be enough power? I am using a 5000mah 2S battery, will my run time be reduced by half? Is a 3s battery needed?

Greatly appreciated all inputs. Thanks!!!
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Re: Need help on running dual brushed motor with single ESC setup

Post by boolean21 on Thu 27 Sep 2012 - 10:14

wyetuck88 wrote:Hi guys, Need your help here, I have decided to run a dual Brushed motor setup, I have read that the turn of a motor will be divided into half if running from a single ESC, meaning to say a twin 20-turn motor will be split into 10 turn each.

Is it possible to run two brushed 20-turn motor on my 320A china ESC, will there be enough power? I am using a 5000mah 2S battery, will my run time be reduced by half? Is a 3s battery needed?

Greatly appreciated all inputs. Thanks!!!

hi bro, running 2x 20T motors does not split the turns into 10T each...

but, if you drive 2x 20T motors with a single esc, the esc will see it as a 10T motor...

Have to check out the stall current of the motor that you are looking at...
the china 320A esc is rated at Peak 320A... not sure about the RMS rating... no reading on the FETs and chips in the ones that i opened up....

if you can find the readings, can google for the datasheet and look for the specs of the FETS and chips...

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Re: Need help on running dual brushed motor with single ESC setup

Post by laneboysrc on Thu 27 Sep 2012 - 11:23

To add to what Boo said:
No labels on the FET (have been scraped off Surprised ) so we won't know exactly what the FETs can handle. There are 2 FETs in parallel for forward direction, and 1 FET for reverse direction. This means the ESC can roughly deliver twice the power forward.

According to the various eBay sellers this ESC is 2S capable only, not 3S!

The actual amount of power you can run through the ESC for an extended period of time will also depend on the cooling you can achieve.

As for motor limit, just for comparison I also have an ACE RC "Velico RS" ESC that is beefier than the China one (more FETs, larger heat sink), and is rated 170A (5 min), 250A (30sec), 400A (1sec). That ESC is spec'ed with "17T or higher".

Run-time will depend on the actual power that the vehicle needs, whether that is achieved by 1 or 2 motors should not have much impact.
Our little Dingo runs easily 3 hours on a 4500 mAh during a normal trail, last week rock crawling it was empty after about 2.5 hours. The same battery in my light 1/10 scale buggy with a 27T "silver can" lasted 30-40 minutes simply due to the larger amount of energy needed.

If you really need more power than a single brushed motor can handle, why don't you go brushless? They are much more efficient, more powerful and available in larger sizes (550 can) than brushed ones.
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Re: Need help on running dual brushed motor with single ESC setup

Post by wyetuck88 on Thu 27 Sep 2012 - 12:44

I see, my plan is just to add a second motor onto the truck and hope that it will provide me with that extra power. I am just not sure if this china esc is capable of handling one more motor in series or in parallel. Cost is the main thing deterring me to go brushless.
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Re: Need help on running dual brushed motor with single ESC setup

Post by boolean21 on Thu 27 Sep 2012 - 13:23

wyetuck88 wrote:I see, my plan is just to add a second motor onto the truck and hope that it will provide me with that extra power. I am just not sure if this china esc is capable of handling one more motor in series or in parallel. Cost is the main thing deterring me to go brushless.

would depend on what motor you plan to use...
but if you want torque for your series 2, don't use 2x 20T motor....

would suggest you go for 2x 35t, 45t or 55t and replace the pinion if required....
if you want to play safe, just add a 2nd peice of china esc.... Smile

i've no issues running 2x 55t using a single china esc... a different one though... cos the stall current for my 55t motors are rather low...
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