Notices
RC Rock Crawlers The official rock crawling forum right here on RCU. Rock Crawler Trucks Rule!

Brushless motor questions

Old 08-02-2011, 09:17 AM
  #1  
JustHover
Junior Member
Thread Starter
 
Join Date: Jan 2011
Location: Pekin, IL
Posts: 23
Likes: 0
Received 0 Likes on 0 Posts
Default Brushless motor questions

I know there is a place for robotics specific questions, however this is an unusual request, even for robots... I know there are folks here who use CC brushless motor controllers...

I'm wanting to use a couple 1/18th scale brushless motors for a differentially steered mini sumo robot. I'm looking at the CC Mamba Micro Pro or the Sidewinder Micro. I need the forward and reverse to be symmetrical, and I'd like the thing to break when not commanded forward or reverse. The problem is I don't want to drop a couple hundred just to test the feasibility. They tell me everything is adjustable, but I can't see through the hype for the information I really need. I even wrote Castle Creations support but they blew me off. Anyone who has experience with these motor controllers wanna help a guy out?

I also see they package these controllers with motors. They have 4200kv, 5400kv, 6800kv 8000kv motors. Which to choose? Run times are very short, 3 minutes. I want the most torque possible and will need to make gearboxes to get the rpm's down to usable levels, around 750 to 1000.
Old 08-04-2011, 07:34 PM
  #2  
K_B
 
K_B's Avatar
 
Join Date: May 2007
Location: Anchorage, AK
Posts: 1,655
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Brushless motor questions

I'm no expert with robots by any means, but don't you usually use stepper motors or gearmotors for robot applications? Those would provide much more accurate movement. As for the Castle motors, they are unsensored, so they have a tendency to cog at low RPMs. The kV essentially means "RPMs per volt". So if you're running 6V, a 4200kv motor spins over 24,000 rpms. Which would be way outta the range you're looking for. And there would be no torque without some sort of transmission/gear-reduction.

You might want to look at Novak's 1/18 crawler ESC/motor instead. It's sensored, so the low speed control will be better. And if you hook it to some sort of gear reduction, you can get decent torque out of it and keep it within the RPM range you're looking for.
Old 08-14-2011, 02:39 PM
  #3  
gohstwrighter
Senior Member
 
Join Date: Mar 2010
Location: delandfl
Posts: 112
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Brushless motor questions



if you realy want to just try out a brushless system the toruo system from excieed looks prity good for under $40 look on nitrorc.com at ther spare parts  or ther moter section.


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.