Subject:
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RE: Fwd: new products (Remote Control)
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 12 Aug 1999 13:17:34 GMT
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Viewed:
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570 times
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> > Great question. They "brake". As soon as you start a motor on the RCX, it
> > doesn't go into "floating" mode again until you turn off the RCX. I don't know
> > how the braking is accomplished but it's probably just a matter of the motor
> > trying to generate a voltage which is immediately soaked up by the driver
> > circuit (which is trying hard to keep the voltage at 0)
>
> Yup. You can see this for yourself by connecting the motor to itself
> with a black cable. Suddenly it's a lot harder to turn.
Not to put too fine a point on it, but it depends which way you connect the motor
to itself. Try the experiment with the wires coming out the same side of the
connector, and then opposite sides...
When it is the same side, the voltage/current you generate opposes the motor
rotation and the motor tries to brake. In other words, you are loading the motor.
When the wires are out opposite sides, there is no apparent braking because
the current is not opposing itself.
I know this is a hopelessly murky description, but try it yourself...
Cheers,
Ralph Hempel - P.Eng
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Check out pbFORTH for LEGO Mindstorms at:
<http://www.hempeldesigngroup.com/lego/pbFORTH>
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Reply to: rhempel at bmts dot com
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Message has 1 Reply:
 | | RE: Fwd: new products (Remote Control)
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| (...) The motor only has two wires going to it, but there are four pegs on the connector. Each peg has a connection to each wire to the motor (see the Lego patent for how this works in any orientation). So, depending on exactly which connections you (...) (25 years ago, 12-Aug-99, to lugnet.robotics)
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Message is in Reply To:
| | Re: Fwd: new products (Remote Control)
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| Robert Munafo writes: > In lugnet.robotics, lego-robotics@crynwr.com (Jacob Schultz) writes: > >This remote control sounds like a neat little thing. > >Just currious.. Does the motors float or brake when you release the > > buttons, and the program (...) (25 years ago, 12-Aug-99, to lugnet.robotics)
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