Brushed vs. brushless motor

[offroader 21]

I have had my losi comp crawler for about a week now and for the last couple days i have been using a brushed set up. I was using a Axial 27 turn motor and a Axial AE-2 speed control. The power plant I was using was had a decent amount of torque but it was not very smooth and heated up way to fast. So today I found an old 13.5 brushless motor and spedo sitting around so i decided to give it a try. The difference between the two stystems is night and day so much more torque and agility with the 13.5. The brushless set up is the way to go with this rig!

 

[hoghead5150]

yeah, about the only way to go with the comp crawler. seems that the drag of the worm gears combined with the high gearing of the transmission really tends to eat up brushed motors. they can be made to work, but take ALOT of maintenance. brushless is so much easier, and since we don't have to have the drag brake there really isn't much drawback to brushless.

 

[losikid]

Yea a sensored 13.5t brushless system is amazing compared to anything else i've ran.

What batteries are you using?

 

[offroader 21]

As of right now I am using a venom 2000 20c 2 cell it is the 1/16 scale pack i think it is a little to big for the battery tray but i used some velcro and it works just fine. I think i am gunna buy the pack losi has made for it but it is only 1650 mah so i am using the venom battery for more run time

 

[hammer29]

I have very good luck with Turnigy Nano-Tech Lipo 3S 1300mAh 11.1v 45-90C it has a 90c peak, im running a tekin RS pro with a d3 brushless. And with brushless is can handle the 90c peak. Also it fits in the tray. I get a hour and 1/4 out of the pack,running it hard. It's great to have that punch when you need it.

 

[Dini]

I have very good luck with Turnigy Nano-Tech Lipo 3S 1300mAh 11.1v 45-90C it has a 90c peak, im running a tekin RS pro with a d3 brushless. And with brushless is can handle the 90c peak. Also it fits in the tray. I get a hour and 1/4 out of the pack,running it hard. It's great to have that punch when you need it.

Are you really getting that amount of run time with a 1300 3S pack!? Seems like most people are getting way less than that.

 

[hammer29]

as an average with the way I drive and full charge it about a hour of run time (ie) new battery.now that been said i have a 1300 sky lipo that i get 42 min out of it older battery.

Sent from my SPH-D710 using Tapatalk 2

 

[Dini]

That's pretty damn good. I hope I can get that much run time on mine. BTW, in case you bought your batteries on ebay (the link you posted)...you paid too much. Check this out ----> HobbyKing R/C Hobby Store : Turnigy nano-tech 1300mAh 3S 45~90C Lipo Pack

 

[stephenwhimire]

Would it hurt to run a non Sensored brushless motor with a small enough pinion

 

[Dini]

Would it hurt to run a non Sensored brushless motor with a small enough pinion

How dare you come into my thread and ask a question like that!

Just kidding. Not from what I've read. It should work fine. Try it and see. Pinions are inexpensive enough.

EDIT-must have missed the "non" sensored part. As stated below-motor cogging.

 

[hammer29]

That's pretty damn good. I hope I can get that much run time on mine. BTW, in case you bought your batteries on ebay (the link you posted)...you paid too much. Check this out ----> HobbyKing R/C Hobby Store : Turnigy nano-tech 1300mAh 3S 45~90C Lipo Pack

You are right about that price but dont like waiting a month to get my batteries from Switserling.

Sent from my SPH-D710 using Tapatalk 2

 

[hoghead5150]

NON sensored systems don't work near as well in a crawler. even with the losi, they don't have the low speed control. you get alot of cogging and then it jumps. just search around here and see all the threads of people with brushless systems that complain of problems only to find out its the cogging of the motor. if you have a sensored brushless system just unplug the sensor wire and see how it does. its not bad on flat ground, but once you get in a bind you can really tell.

as for run times, getting an hour out of a 1300mah pack is crazy! i get around 10-12 minutes out of a 800mah pack. remember tho, with the losi, you want to take breaks often to help keep the motor and axle temps down. if i could run mine for an hour straight, i could cook a steak dinner on it!!!! usually after about 10 minutes (1 pack) mine is ready for a break to cool down. but then again, maybe i'm a little harder on mine than most peole.

 

[Dini]

You are right about that price but dont like waiting a month to get my batteries from Switserling.

Sent from my SPH-D710 using Tapatalk 2

Is Switserling close to Chiwan? Do they really take that long to get from HK?

 

[Dini]

NON sensored systems don't work near as well in a crawler. even with the losi, they don't have the low speed control. you get alot of cogging and then it jumps. just search around here and see all the threads of people with brushless systems that complain of problems only to find out its the cogging of the motor. if you have a sensored brushless system just unplug the sensor wire and see how it does. its not bad on flat ground, but once you get in a bind you can really tell.

as for run times, getting an hour out of a 1300mah pack is crazy! i get around 10-12 minutes out of a 800mah pack. remember tho, with the losi, you want to take breaks often to help keep the motor and axle temps down. if i could run mine for an hour straight, i could cook a steak dinner on it!!!! usually after about 10 minutes (1 pack) mine is ready for a break to cool down. but then again, maybe i'm a little harder on mine than most peole.

Your motor and axles are really getting that hot? I'm going to be pissed if I have to stop and cool my LCC down after 15 minutes.

 

[hoghead5150]

it depends on how hard i'm driving. if i'm out on the rocks i'm pretty hard on the rig. lots of binds, lots of digs, these things will heat up the motor pretty quick. usually during a practice i need to stop after each pack (10 minutes) and let it cool. if i'm just playing in the yard, or running around easy stuff, i usually run 2 or 3 packs before letting it cool.

these rigs are NOT designed for extended run times. they are COMP rigs. made to run 6 minute courses and then rest between. even my axial ax10 needs a break after a pack during my practice sessions (around 20 minutes on that one).

 

[dentonmac]

it depends on how hard i'm driving. if i'm out on the rocks i'm pretty hard on the rig. lots of binds, lots of digs, these things will heat up the motor pretty quick. usually during a practice i need to stop after each pack (10 minutes) and let it cool. if i'm just playing in the yard, or running around easy stuff, i usually run 2 or 3 packs before letting it cool.

these rigs are NOT designed for extended run times. they are COMP rigs. made to run 6 minute courses and then rest between. even my axial ax10 needs a break after a pack during my practice sessions (around 20 minutes on that one).

When I had mine stock I was also was getting about an hour run time on a 1300 battery with 21.5T. If it got hot, I had a bind somewhere. Granted I was not pounding on it, but I was not 'Driving Miss Daisy' either.

I converted it to a sporty. Removed dig (servo and forks), HD gears front - Stock rear, 17.5 motor. Now I am getting numbers similar to yours, hot after 15 min and shorter run times (like ~20 min) out of the 1300. Axles and gearbox run free, so no binding. I do know that some of the shortened run time is that with the 17.5 on 3s, my trigger finger gets happy. So fun! Almost all of that has been overcome with dropping the pinion a tooth...14 to 13.

I put another stock LCC back together from spare parts, and I am back to getting about an hour with cool electronics. I know part of it is the overdriven front and 17.5 on the sporty, but I think that there is binding in the drive train (called worm stall...I think) that is alleviated with liberal use of the dig.

Sorry, kind of thinking out loud, but letting you know what I have discovered.

 

[Dini]

Nah, that's good info.