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crowconor
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PostSubject: speed controllers   Wed Nov 10, 2010 11:01 pm

what have you guys been using as drive speed controllers, ive been using gears ed ones, and i dont like them to much, i run about 24volts
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Jeff L
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PostSubject: Re: speed controllers   Wed Nov 10, 2010 11:20 pm

For what weight class? 12-15 pounds? 120 pounds? 3 pounds? The answer is different for each of these.

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crowconor
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PostSubject: Re: speed controllers   Thu Nov 11, 2010 12:36 am

15lb sorry
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Cody
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PostSubject: Re: speed controllers   Thu Nov 11, 2010 10:41 am

everyone is using banebots or scorpions
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crowconor
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PostSubject: Re: speed controllers   Thu Nov 11, 2010 5:26 pm

are they reliable? what models?
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jeeves_m_d
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PostSubject: Re: speed controllers   Thu Nov 11, 2010 7:14 pm

Banebots: http://banebots.com/pc/ELECTRONICS/BB-1245

Scorpions: http://robotcombat.com/products/0-SCORPXXL.html
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rdubard
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PostSubject: Re: speed controllers   Thu Nov 11, 2010 7:47 pm

First of all, did you know that, immediately after adding a link, if you hit the wrong key it puts in empty links, and if you hit the wrong key again (a different one, but Lord knows which combination) you go to the previous page and LOSE YOUR COMMENT?

As you might guess, this has happened to me today. . . twice.
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rdubard
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PostSubject: Re: speed controllers   Thu Nov 11, 2010 8:06 pm

Ok, now that I've got that off my chest. . .

The Banebots 12-45 are really popular, prolly cause they are small, light, and not too expensive. But they cannot handle anything higher than about 14V, which means that Lipos are limited to 3s. Also, the signal wires break off really easily, and we have had some difficulty with them consistently recognizing the same signal as 'zero stick.' As far as I know, they cannot be programmed, nor calibrated.

We had a lot of Victor ESCs from our time with the FIRST competition, and some of them can handle high voltages. They are also pretty durable, with high current handling capability (especially if you use the included fan). They are easy to calibrate, but not programmable per se. On the other hand, they are quite large for a 12 or 15lb robot and not too cheap either! Worst of all, they require a signal booster if you are using a standard RC receiver, and finally the signal wires can sometimes come out during battle (tho there are ways to prevent this).

Some people use the Scorpion XXL which is nice because it does both left and right sides of your drive, and has a way to change your drive during battle if your robot gets inverted. It costs twice what a BB12-45 does, but you only need one, so it's a comparable price. The specs say it can do 28 volts and 20 amps (the power capability seems low to me, and it isn't clear if that is per side or overall). Also, I've only owned one of these, and I did NOT like the way the output power wires connected (seemed flimsy). It also needs to be wrapped in something to keep it from shorting against the metal interior of your robot.

We are still in search of a good alternative to the BB12-45, particularly one that can handle 5s Lipo and 40 amps or so, but pricewise and spacewise we haven't found one we like yet. Please let me know if you discover a good one.
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crowconor
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PostSubject: Re: speed controllers   Thu Nov 11, 2010 8:08 pm

thanks for the links, ive never heard of that flip control thing, seems awesome, is it really worth it? i mean its possible to drive perfectly fine upside down, but it takes practice, how hard is it program something like that?
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Cody
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PostSubject: Re: speed controllers   Thu Nov 11, 2010 9:15 pm

banebots really do not like too much power

If your bot is perfectly symetric it is possible to drive upside down just like right side up, but depending on how your weight is distributed it might make it hard to control. Of course you'll need a reversible weapon ESC also (depending on the rx/tx your using you can set it all to one switch i believe)

Have you guys managed to actually keep you weapon attached yet?
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crowconor
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PostSubject: Re: speed controllers   Thu Nov 11, 2010 9:35 pm

hahah yes, im assuming youve seen the nationals vid? thats the only time we've had that happen it was because a team mate cut the axle to short and we have no where to test our weapon so we didn't think it was going to be a problem, but then we found out first match...we still got 5th at nationals that year even though we couldn't keep hold of our weapon
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Cody
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PostSubject: Re: speed controllers   Thu Nov 11, 2010 10:25 pm

i thought i saw it happen in massachutes too, guess not

I think i was thinking it was when you got stuck on the front risers

o well haha
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crowconor
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PostSubject: Re: speed controllers   Thu Nov 11, 2010 10:33 pm

yup we got stuck on the horns/sliders in the match against uknight, were you at that comp, it waS RATR 5 I THINK
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rdubard
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PostSubject: Re: speed controllers   Fri Nov 12, 2010 6:01 am

Cody wrote:
banebots really do not like too much power

Well, the BB12-45s don't like high voltage. They are actually rated at 40 amps of current.

Scorpions can handle higher voltage, but their current rating is half of the banebots.

You see, that's the thing that's maddening to me--both are pretty good, but neither one is really all there.


Also, I forgot to mention that the BB and Scorps have a BEC, but the Victors do not.
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rjw
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PostSubject: Re: speed controllers   Fri Nov 12, 2010 10:26 am

scorpion XXL's are discontinued, in that the piggybacked chips have been failing in many cases.

the XL is still available, but is rated much lower.

Ithink that Mike (NCR) has found some escs that look like a brushed version of a castle mamba max, but while rated much higher, they are also not cheap.

MLEC burnt out a bunch of XXL's at nats last year, making brushless alternatives look somewhat inviting.



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