Would Battlebot Motors and Drives work?

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KAZUALT

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Sep 21, 2009
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I have a friend at Carnegie Mellon that does battlebot fighting. His bot weighs 87lbs and is driven by to geared motors from this site. http://www.robotmarketplace.com/products/MAG-BKTMODA.html
Has anyone every tried these motors. I am a total newbie to the EV world, but have operated his battlebot, and that thing FLIES!!!! We gps'ed it at 19mph and the only reason we didn't go faster was the lil wheels lead to incredible lake of steering. If this has been discussed before please give me the link. If not, why not?
Thanks for everyone insight
KAZUALT
 
Sure that would work. The Magmotors are brushed, though, and not cheap..... The other motor uses ferrite magnets and is a bit heavy and not very efficient..
 
I was talking more about the gearbox setups. The motors that my buddy uses are extremely hardy. They put up with alot of abuse and come back for more. But, they are still WAY $$$$. But, some of the other battlebot pages I have been to have cheaper motor and alot of different gearboxes. I don't have a list of links, but any web search turns up a bunch of sights. I just figured with most of the bigger bots weighing up to 130lbs they should be able to move a trike.
 
Yes $150 isn't so bad.. but how big is it? Hard to tell from the wide angle shot.

130 pounds.. Remind me not to drag race any battle bots unless my bike can better than double their watts.
 
Those motors look essentially like the 4-pole motor I have on my CrazyBike2, which is around 650W nominal at 24V, but I can get well over 2KW out of it peak, and it is more than powerful enough to totally destroy my drivetrain (it's done in several components so far, including a chain and a wheel today, due to an unknown failure in the drivetrain itself causing the chain to jump). I regularly pull 9-12A battery current thru it at 38-39V pack voltage for long periods, and it only gets warm. That's about a 350-450W constant power draw.

It is from a heavy-duty powerchair, and has it's own reduction gearbox on it with a shaft intended for the actual wheel to bolt directly to (one motor and gearbox on each side of the chair). The motor is not integral to the gearbox, so it can (and has in other versions) also been used for battlebot type things.

They are just ferrite magnets, and are quite heavy. Mine is perhaps 10-12 pounds for the motor alone, and about 20 for the gearbox and motor.

I've also used a 350W 2-pole version of the same thing, and current draws are a bit less with that one but it gets really hot doing the same work and it has far less torque than the 4-pole. Much less than half as much.

So yes, these types of motors will work and can work well, but they will be very heavy, compared to RC motor drives especially, for the power density you get.
 
Guys have tried the Mag motors on scooters before. They do have a lot of power for the size, but the brushes are soft and wear out rapidly. How many battle bots have 1000km on them?
 
I think he was posting only to show another type of drive reduction was available.. its 150$ and doesn't seem like it'd be too difficult to adapt to other motors. Says 5.1 pounds. Looks strong. I guess it should be, its made for battle!
 
I just happen to think of it runnin my buddies bot. Like i said that thing is heavy, atleast 70lbs, and it flies. It also has no problem with lite rain and small puddle. The motor and controller put of with alot of hits and keep workin. Granted they are out of mine and most folks price range, but if you do have the money and weights not an issue, then I think it's a great option. Especially if you are building something that will take a beating. Like off road, mountain bike, trikes. The last point is that it is tried and tested technology on bots, but there is no reason it can't cross over.
KAZUALT
 
One of the robot websites sells Dewalt gearbox and motors, I've always wondered how the electric drill components would stand up to the extra torque requirements of an ebike. Although alot of those drills claim to put out plenty of foot pounds of torque. Timma has a bike with a robot reduction unit on it, but it has never been ran yet so we don't know how it will react to our needs.
 
etard said:
One of the robot websites sells Dewalt gearbox and motors, I've always wondered how the electric drill components would stand up to the extra torque requirements of an ebike. Although alot of those drills claim to put out plenty of foot pounds of torque. Timma has a bike with a robot reduction unit on it, but it has never been ran yet so we don't know how it will react to our needs.
Click to expand...

Yeah those Banebots P80 Planetary gearboxes are a bit of a longevity worry, but i suppose the great value price may reflect this. I recently realised that the planet and sun gears run without bearings, rather bushings only. This is fine for 5 minute robot matches, but not so good for 1000's of klms worth of wear from hard abuse. Anxiously awaiting some longer term reliability testing By Timma.....

Heres some pics of the replacement parts for the P80 series gearboxes. The input and output shafts either are or can be supported by bearings, but as you can see, it looks like steel bushings alone supporting the reduction stages.

http://banebots.com/c/PARTS-P80
P80P-GP40.jpg

P80P-GS40.jpg

P80P-C4.jpg

P80B-S4S.jpg

P80P-GR2.jpg

P80A-4n-0005-R2.jpg
 
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