Let's Make Robots!

Combat RC / ESC/BEC controllers and motors- Brushed and Brushless

Hey LMR I was hoping you could help me with a few questions the internet/google cannot fully teach me haha.

So I am thinking about maybe making a combat robot/battle bot (http://www.robotmarketplace.com/therobots.html) whatever you want to call it with some left over cash. So I have some questions on Brushless and Brushed motors.

What is the difference between Brushed and Brushless? So far I understand that one has three wires and the other two- +, - , brushless has a servo wire( to make it simple for me ;)    So what am I missing? Is one geared or what?

Also I think I understand that I have to have a ESC with BEC for another battery for the motor. Am I correct? And would I need two? One per motor? 

Sorry for the multiple questions but please help a guy who needs some good teachers to explain it to him :) thanks 

Feel free to ask me anything- Such as my intent/ what I know/ anything. Thanks

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A BEC is just a voltage regulator. RC people use them to supply 5v to their RC receiver and servos. What kind of motor controller are you going to be using. A brushed ESC or some other controller? What battery will you be using? 


Well im thinking- http://www.robotmarketplace.com/products/0-DTXC2010.html, Bec -http://www.robotmarketplace.com/products/0-DYS30055.html, So would I need a ESC- Speed controller or not? I have a reciever -http://www.robotmarketplace.com/products/0-GWR6NIIH.html that i am using on other projects for the motor controller. I hope that answers your question but ask me and tell me anything


First off a reciever is not a motor controller. The receiver is what sends signals to the ESC. So you still need a motor controller.

You could use that battery to power the motors with a correct ESC or something else. The BEC would be used as a voltage regulator to power the receiver, if the ESC does not have one built in, and any other electronics considering they do not draw more amps than it can supply and run on 5v. 

would this be a motor controler? sorry for my lack of knowledge- http://www.robotmarketplace.com/products/0-GPMM2025.html and that would be a bec and esc right?


What is ESC again? I just don't get that right now.

So... with this motor- http://www.robotmarketplace.com/products/0-PL994.html all I would need is this- http://www.robotmarketplace.com/products/0-DYS30055.html because... haha tell me if Im wrong-it is brushed since it has the gearing as you said above? I have the reciever and transciever just for extra info for you. 

For instance, this robot (one from your link) weighs 108 pounds http://www.robotmarketplace.com/locust1construction.html . If you want something even near that size then those motors are way too small. Those motors have about 4.4 pounds of torque at 6 volts.

Ya no I dont plan on going that big I just want to make one for fun. Not really planning on competions just wanting to get involved and learn stuff. I plan on 5lbs or less

As Patrick said, those motors would be for a smaller robot.

Regarding the BEC, you don't necessarily need one, but you do need some sort of power for your motors and electronics. The BEC you linked provides 5A @ 5V. Your two motors have a stall current (maximum load) of 1.6A each. So the BEC would certainly work, but might be overkill.

Check out OddBot's post on voltage regulators, which may be a lot less expensive. You need to determine what the overall load of your robot (power for motors, servos, electronics, etc.), so you can design or buy the appropriate power source.


oh ok so I might not need a BEC? I have a 6 or 7.2 battery at the moment for the reciever power and like 3 servos on one project but I wouldnt use them here. Ill try to get everything I would have on there asap