Brushed motor wiring questions - Page 2 - RC-Monster Forums

suicideneil · 10.22.2008, 01:05 PM

Neither do I- if the crappy Evx2 can handle a pair of 700Ho motors just about on 4s lipo, the MM shouldnt have any issues for sure.

lincpimp · 10.22.2008, 01:46 PM

Quote:

Originally Posted by suicideneil

Neither do I- if the crappy Evx2 can handle a pair of 700Ho motors just about on 4s lipo, the MM shouldnt have any issues for sure.

I wonder what the difference between the kershaw 700 HO motor and other 700 motors?

TexasSP · 04:38 PM

Motor	Output @ 16.8V	RPMs @ 16.8V
Traxxas Titan	About 160 watts	25,000
Revolver 700	252 watts	29,400
Revolver 700-HO	363 Watts	27,860

lincpimp · 10.22.2008, 04:45 PM

Ok, how about the physical difference? The 700 HO must have better qual windings and magnets, as it seems have a similar kv to the reg 700. I guess that explains the cost. For my purposes the 700 motors Neil linked to will be more than enough.

suicideneil · 10.22.2008, 04:51 PM

I think the 700HO motors have 5 pole armatures, rather than 3 poles on the normal 700s... I think.

lydiasdad · 10.22.2008, 09:12 PM

Sorry I meant to link to it.

Don't waste on other big brushed motors, believe me I have tried them all. Not even close to the dewalts. Here http://www.robotcombat.com/products/dewalt_motors.html The motors I have are the "new" 18 volt motor. The speed controller I used is on this site also.

lincpimp · 10.23.2008, 12:17 AM

Quote:

Originally Posted by lydiasdad

Sorry I meant to link to it.

Don't waste on other big brushed motors, believe me I have tried them all. Not even close to the dewalts. Here http://www.robotcombat.com/products/dewalt_motors.html The motors I have are the "new" 18 volt motor. The speed controller I used is on this site also.

Thanks, do you think that a MM would be able to handle 2 of them? Any idea what speed they turn at a specific voltage?

Maybe I would only need 1 of them? I really can't see a brushed motor doing more than 500 watts...

TexasSP · 10.23.2008, 09:07 AM

I can remember several years ago guys were running the 18v dewalt motor single setup on 16.8 volt nimh and getting around 32-33 mph in the e-maxx. I think one would be plenty for your application.

Arct1k · 10.23.2008, 10:22 AM

I think the MM would be easily able to take them...

lincpimp · 10.23.2008, 11:06 AM

Quote:

Originally Posted by TexasSP

I can remember several years ago guys were running the 18v dewalt motor single setup on 16.8 volt nimh and getting around 32-33 mph in the e-maxx. I think one would be plenty for your application.

That sounds good. I may have to give one of them a try. The dual 775 motors look good too, but I would have to buy pinions for them, and a motor mount, I could make a single motor mount easily for the 820 motor.

lincpimp · 10.26.2008, 09:18 PM

So I have decided to try the titans first. Looks like 13/72 gearing will do the job.

Oppressor · 10.27.2008, 10:52 AM

Remember that the mamba max won't have to switch phase with a brushed motors so it should be able to handle 200-300 amps instead of 100(Of course i doubt that Castle would warranty it at those amp even in brushed mode). It's not for nothing that manufacturer have problem doing brushless controller.

lydiasdad · 11:28 PM

Quote:

Originally Posted by lincpimp

Thanks, do you think that a MM would be able to handle 2 of them? Any idea what speed they turn at a specific voltage?

Maybe I would only need 1 of them? I really can't see a brushed motor doing more than 500 watts...

I peaked 1900 watts on my eagle tree with that 18 volt dewalt motor in my 1/5 scale e-maxx/baja(waiting on MM). It was doing a constant 700 plus watts. That was using 6s2p a123 cells. I also ran 8s1p1 a123 and peaked at 1700 watts. If those numbers are right those HO motors suck. Like I said I tried them all before going brushless and the dewalts are the most powerful brushed motors of that size. I still run one in my jugg2 on 6s 123cells. I do think the mamba can run it. Just use the high power wiring setup.

Oppressor · 10.29.2008, 07:53 PM

Quote:

Originally Posted by lydiasdad

I peaked 1900 watts on my eagle tree with that 18 volt dewalt motor in my 1/5 scale e-maxx/baja(waiting on MM). It was doing a constant 700 plus watts. That was using 6s2p a123 cells. I also ran 8s1p1 a123 and peaked at 1700 watts. If those numbers are right those HO motors suck. Like I said I tried them all before going brushless and the dewalts are the most powerful brushed motors of that size. I still run one in my jugg2 on 6s 123cells. I do think the mamba can run it. Just use the high power wiring setup.

In fact there is a few more powerful brushed motor at that size. One of the most fearsome one are astro cobalt motors reaching 85 to 88% efficiency iirc.

http://www.astroflight.com/index.php...products_id=85
http://www.astroflight.com/index.php...products_id=87
http://www.astroflight.com/index.php...roducts_id=126
http://www.astroflight.com/index.php...roducts_id=128

The astro cobalt 90 is said to be able to replace a .90 glow engine on a plane... 1500-1600 watts continuous which is near a neu 1521 but at 2 pound. The good point though is that controller handling brushed motors are more robust...

lydiasdad · 10.29.2008, 08:17 PM

Quote:

Originally Posted by Oppressor

In fact there is a few more powerful brushed motor at that size. One of the most fearsome one are astro cobalt motors reaching 85 to 88% efficiency iirc.

http://www.astroflight.com/index.php...products_id=85
http://www.astroflight.com/index.php...products_id=87
http://www.astroflight.com/index.php...roducts_id=126
http://www.astroflight.com/index.php...roducts_id=128

The astro cobalt 90 is said to be able to replace a .90 glow engine on a plane... 1500-1600 watts continuous which is near a neu 1521 but at 2 pound. The good point though is that controller handling brushed motors are more robust...

Those are a bit more powerful, but the dewalts are one tenth the price.