best motors for a robotic platform.

[Hiphopbots]

So im curios about What is the best motors to move a robot around in 20 pounds, 50 and 100 pounds. With a budget of max 1500 pounds.

I want to buy a pair or 2 great motors to use to build differents robotic platforms in the same weight limit. But I'm a bit in doubt of what size of robots I want to build.

Are we talking about that the ampflow 28-400 and the etek motor is the best valued on price pr hp?

[plargen]

spotter these on ebay a while ago should shift a robot pretty well

http://www.ebay.co.uk/itm/DC-Hybrid-...item3cd5d00b41

[Hiphopbots]

Thanks.
Will the motor be able to go from CW to CCW in a second and not take damage from it?

[typhoon_driver]

When you say platform are you meaning literally a platform to move props etc on stage or similar or for a combat robot?

The weight categories that are big atm are the 30lb and 220lbs weight classes.

You also mention nothing of speed. A wheel chair motor will move all of the above but not at high speed whereas yes an etec or ampflow would move a machine quickly but you will need a decent custom gearing system with each.

Are you US, UK or otherwise based?

[maddox10]

Gary, good Questions actualy.

I guess Hiphopbots is UK based. As he specifies a £1500 budget. That's a very large budget compared to most. And could include everything, like batteries and speedo, even TX/RX.

Hiphopbots. The questions Gary asks are relevant.
A drive that makes a 20lbs machine a dragster can power a 220lbs machine at a snails pace.
So, what is the purpose? If it concerns robot for combat- the main thing on this site- your choises in weight are strange.
20 lbs fits in between the 6 kg raptor class and the 13.6kg featherweights.
50 lbs is close to the lightweights of 25 kg, and I don't know of any being ready for the task, so you'll end up with a unique machine in the UK or Europe.
100 lbs is close to the middleweights, and that's also a class not much in use. The only one I know of is Steel sandwich, and that fights 100 kg heavies.

In short. 150 grams is the lightest class in common use, the Antweights.
Beetles of 1.36/1.5 kg are up and comming.
the 6kg Raptors are a German class and is popular on the "main continent".
The feathers of 30lbs/13.6Kg is the most common class atm, and popular everywere.
25 and 50 kg machines, you'll have to look at the US or Brazil for any opposition.
220lbs/100kg Heavyweights are still the "king of the hill" machines.

If it's for a "drive platform" for other purposes, then we should know what the purpose is.
But for most "common" purposes a drive that can reach walking speeds is more than adequate, and power is mandated by the terrain you want to cross.

[Hiphopbots]

Thanks for your answers.

Im from Denmark.

What I mean with a robotic platform is to have the base requirements, to build different robots where I can use the same motors again and again (since its so expensive)


Im sorry I wasn't clear enough, my patience was running out since I was typin on my mobile..

The robot I want to build is a robot which can cary a high load around for me and follow me, think like an industrial kind of way. (onroad and offroad)

So im not looking for a fast robot, but a robot with a high torque but still move around with a speed of 6-8 kmh maybe.

The budget is with a motor controller. (I would like it to be, with and without the control of a radio-controller.

voltage around 24 - 72

the platform will be around 50 -100 kg, and lets say to carry 500 kg? even more will be great.

The first type is to follow around with me.

The second type would be to have 2 of them working together, maybe moving a car.

The reason of differens weight classes was both because of curiosity but also in terms of building a small scale version first.

[maddox10]

For a robotic "carry-all" that can carry 500km at walking speed, you'll need some serious power, especialy if the terrain ain't a factoriesmooth floor.
Use a roboteq for the added control and sensor inputs these allow.

You'll need serious grunt, and a lot of heatsink capacity, so we won't muck around with small high power but easely overheating motors.
http://www.robotmarketplace.com/prod...A40-300 motors.
Or else the more easely available ISKRA AME series permanent magnet motors (Hydraulic shops will have acces to these)
Batteries can vary between large SLA's and normal grade LiPo.

[Hiphopbots]

Thanks Maddox10.

is the only reason to use the a40-300 instead of the a28-400 that the a40-300 get less hot?

how about overvolting the motor to 36 volt, would that be a problem?

[typhoon_driver]

To be honest for moving such a large load it may be better to just look at hydraulic motors rather than an electric system.

I think you need to properly set the boundaries of the project. 20lbs versus 500kg is a BIG jump and you can't use the same motors in either. For a 500kg mover your motors will be 20lbs plus in weight!!

[Hiphopbots]

Thanks Typhoon-driver. I never considered using hydraulic motors for the purpose, thanks I'll do the research on it.

The small 20lb was most of curiosity.

[maddox10]

Hydraulic drive setups have advantages, but serious disadvantages too.

Main advantages are huge torque and compact, and very good control if done well.
Main disadvantages, efficiency is low, you'll need huge batteries compared to what a direct electric drive would need. Proportional valves are expensive (like £400 a piece), and controling them will need serious electronics making the "cross over" between "conventional hydraulics and "custom electronics".

500 kg at walking speed doesn't need that much power in the end. About 1 kw. Unless we're talking ramps and such. then it goes up very fast. With the setup I talked about, you'll have at 24V 7.2Kw available. The motors can take that for while.
Batteries on the other hand.... How long do you want it "available"? 1 hour? 8 hours (working day) or more?

[cnc_machinist_andy]

hey fella you may want to look into golf club trolleys, they have already been invented whereby you push a button on a gadget and the trolley comes to you.