Subject:
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Re: Hexapod servo supply
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Sat, 11 Mar 2000 00:47:09 GMT
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Original-From:
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Adam Oliver <oli@wantree.AVOIDSPAMcom.au>
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Viewed:
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1518 times
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I had a very similar problem with my robot. When the servos are under high
load (ie holding up your robot) and you try to move them all at once, the
current drawn is quite large. I never actually measured how large, but large
enough to destroy a 1A plugpack! I also found that the plugpack has a
"recovery time" of sorts in that after moving the servos, there is a finite
period of time before the same move can be performed.
My final solution was to either slow the movements (ie don't move them all
at once, just 3 or so at a time) of the servos or to use a battery designed
for model aircraft which can supply high current for short periods of time.
Of course you should also try and reduce the weight wherever possible. Also
try to use a lever arrangement to "gear" the legs to provide more torque at
the cost of slightly reduced height of the step.
Check out www.wantree.com.au/~oli and have a look at the pictures to see
what I mean about gearing the leg
Hope this helps
Adam
----- Original Message -----
From: Frankie Lai <97139371d@polyu.edu.hk>
To: <handyboard@media.mit.edu>
Sent: Saturday, March 11, 2000 4:33 AM
Subject: Hexapod servo supply
> Hi all,
>
> I am now building a hexapod robot. There is something wrong on the servos
> preformances. Actually, my robot weights 1.6kg, and by calculations my • servos
> can support up to 2.5kg with normal operations. But when I connected the • 6v dc
> supply for the servos directly, they did not work as I expected. They did • not
> provide as much torque as I needed. And I found that the problem was due • to
> the load. When I test them separately, they all works at its normal • operation
> level, but when on load, the torque become very small.
> What I want to ask is:
> 1. I used a transformer for the dc supply with maximum 1200mA current • draw,
> for total 12 servos. Is there not enough current for the servos?
> 2. Shall I add some voltage and current regulators to the servos rather • than
> connecting them directly to the supply?
> 3. If yes, I actuatly do not know how the circuit is, can anyone give me a
> piece of advise or give me the schematic?
> 4. Since I would like to use Nicd battery for future development, can I • also
> use the same regualtor circuits?
>
> Details:
> Hitec HS-422 servos x 12
> with 6v dc supply.
>
> Thanks for your kindly attention.
> Frankie Lai
> 97139371d@polyu.edu.hk
>
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Message is in Reply To:
 | | Hexapod servo supply
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| Hi all, I am now building a hexapod robot. There is something wrong on the servos preformances. Actually, my robot weights 1.6kg, and by calculations my servos can support up to 2.5kg with normal operations. But when I connected the 6v dc supply for (...) (25 years ago, 10-Mar-00, to lugnet.robotics.handyboard)
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