Subject:
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Re: Mars rovers use Lego principles?
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 5 Jan 2006 04:20:59 GMT
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Viewed:
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1521 times
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As far as I know, it's the standard process for implementing a brake.
All the electric forklift trucks I drove used this method as the main
brake. There was a mechanical emergency brake as well, but the main
brake was to use the motor to generate power.
Rob
dan miller wrote:
> Hey, isn't this the same principle the RCX uses to brake motors? I've never
> heard of it being used on larger robots.
>
> "On Spirit and Opportunity, the brakes are designed to keep the rover wheels
> from being bumped off course while driving. Dynamic braking is accomplished
> via a relay switch that places a short across the motor windings of an
> actuator [motor] that is not being used. If that actuator starts to move
> unexpectedly, it acts as a generator and the short provides an electrical
> load that slows the motor down. The same principle is used to generate
> electrical energy for hybrid cars when the brakes are applied."
>
> http://www.planetary.org/news/2004/1209_Mars_Exploration_Rovers_Update_Spirit.html
>
>
>
>
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>
>
>
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Message has 1 Reply:
 | | Re: Mars rovers use Lego principles?
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| (...) Aside from the fact that it's a cheap technique (one relay replaces a whole slew of servos, hydrailics, brake pads and disks) - it also doesn't wear out like friction-based brakes do. For Mars rovers, the power recovery must be worth having - (...) (18 years ago, 6-Jan-06, to lugnet.robotics)
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Message is in Reply To:
| | Mars rovers use Lego principles?
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| Hey, isn't this the same principle the RCX uses to brake motors? I've never heard of it being used on larger robots. "On Spirit and Opportunity, the brakes are designed to keep the rover wheels from being bumped off course while driving. Dynamic (...) (18 years ago, 5-Jan-06, to lugnet.robotics)
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