Subject:
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Re: Control lego motors and rotation sensors
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 26 Apr 2002 16:45:08 GMT
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Viewed:
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658 times
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In lugnet.robotics, "T. Alexander Popiel" <popiel@wolfskeep.com> writes:
> In message: <Gv6Ery.C07@lugnet.com>
> "John Barnes" <barnes@sensors.com> writes:
> > Wow! I hope LegOS has the option to use On and Float too. I was planning on
> > migrating to LegOS soon, but if it does On and Brake, it is to be avoided.
> > That technique simply burns battery power!
>
> Oh, it probably does have that option; if nothing else, you
> can change the code to do it that way. I simply find the
> ON/BRAKE modulation to be more useful, so haven't bothered
> looking for an alternative.
>
> - Alex
The 'on-brake-on' method of speed control is VERY useful. When implemented
it looks and acts like a stepping motor. For an example, go to my website
at http://www3.sympatico.ca/jdkalpin and navigate to my Injection Molding
Factory. There is a motorized air valve with a narrow throttling range,
being opened and closed with great delicacy. You could not do it any other way!
I'm not sure that it uses extra power. I believe the 'brake' mode is
achieved with back-EMF by short circuiting the motor terminals. I
dry-cycled the Mold Press for several hours and did not need to change
batteries. However, it is not easy duty for the motors; it's a testament
to their design ...that I have not ruined one yet.
Jerry
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Message has 1 Reply:
 | | Re: Control lego motors and rotation sensors
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| (...) I'm not so sure about motor design, there are quite a few motors that block (one in ten for me). Since wou use RoboLAB it may rather be the LEGO firmware that protects your motors, it contains code to limit the speed of switching the motor. (...) (22 years ago, 27-Apr-02, to lugnet.robotics)
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Message is in Reply To:
| | Re: Control lego motors and rotation sensors
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| (...) Oh, it probably does have that option; if nothing else, you can change the code to do it that way. I simply find the ON/BRAKE modulation to be more useful, so haven't bothered looking for an alternative. - Alex (22 years ago, 26-Apr-02, to lugnet.robotics)
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