They obviously get BOTH. They have high precision positioning and enough
power to enable the 80 kG machine to jump off the ground. I read an
interview where they said the hardest part of the design in the
computer-controlled valve. It was perfected over a 12 year period. They
started with aerospace hydraulics, the kind used for airplane control
surfaces then made their own. But Atlas is older, from 2016. Their newer
robots ("Spot" the yellow dog in the dance video) are using BLDC motors and
reduction drives.
Atlas really is Hydraulic. In fact in the dance video, you can see oil
under the feet that is trampled into the floor. Atlas is known to "bleed"
red fluid. Atlas has 28 hydraulic actuators and a battery-powered
pump. Here is a definitive answer:
https://spectrum.ieee.org/robotics/humanoids/how-boston-dynamics-is-redefining-robot-agility
In both cases however you don't see the typical motor bolted to frame
construction. They are an integrated designed where the frame is the motor
housing and also the frame is drilled out for plumbing or to make a valve
body. Every bit of metal has multiple functions
Here is another short video with a little bit of text to explain how they
do the control part. It's the software that is the hard part here.
https://youtu.be/_sBBaNYex3E
On Sun, Jan 3, 2021 at 1:48 AM Nicklas SB Karlsson <nk@nksb.online> wrote:
> If controlled by hydraulic valves efficiency will be really bad but
> maybe dynamic response could be really fast.
>
> If not controlled by hydraulic valves efficiency could however be good
> then correctly designed but there might be problem to get high precision
> control.
>
>
> Den 2020-12-30 kl. 20:22, skrev Chris Albertson:
> > Altas is hydraulic. It has 28 hydraulic actuators and one
> battery-powered
> > pump. The battery is 3.7 KWH size They say it runs for about an hour.
> > So he is burning 3.7 Kw The robot would heat a good size room.
> >
> > The yellow dog "Spot" is 100% electric with custom BLDC motors, 3 in each
> > leg.
> >
> >
> > On Wed, Dec 30, 2020 at 5:19 AM Les Newell <les.new...@fastmail.co.uk>
> > wrote:
> >
> >> I saw this shortly after it came out. At the time I wondered if they
> >> were using hydraulics on Atlas. At one point you can see what looks
> >> suspiciously like some liquid was spilled on the floor. Looks like one
> >> of the robots sprung a leak during testing.
> >>
> >> Incredible motion control. They've come a long way since Big Dog.
> >>
> >> Les
> >>
> >> On 30/12/2020 02:20, Chris Albertson wrote:
> >>> Just when I think I am beginning to understand the basics of
> controlling
> >>> motors, PID and MPC controllers, someone has to prove I don't know
> >> nothing.
> >>> This is the best demo of 28-axis machine programming I'm ever seen.
> >> (yes,
> >>> 28) "Atlas has one large battery-powered motor and 28 hydraulic motors
> >>> with encoders. The movement is controlled by a kind of g-code
> giving
> >>> the target locations then Atlas does his best to get there.
> >>>
> >>> This is I think to date the best display of machine motion programming
> >> ever
> >>> https://youtu.be/fn3KWM1kuAw
> >>>
> >>
> >>
> >> _______________________________________________
> >> Emc-users mailing list
> >> Emc-users@lists.sourceforge.net
> >> https://lists.sourceforge.net/lists/listinfo/emc-users
> >>
> >
>
--
Chris Albertson
Redondo Beach, California
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