Subject:
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RE: Using the Motor as a Tachometer
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 9 Aug 1999 22:16:47 GMT
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Original-From:
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Rich Thompson <rich_thompson@cmcmaxSPAMLESS.com>
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Viewed:
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1145 times
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Any rotating motor becomes an instant generator too...I use motors to power
the fiber optic kit instead of using a port on the RCX or a seperate battery
pack. An example is at:
http://www.marsrobot.com/monster3.htm
Rich Thompson
richone@midsouth.rr.com
http://www.marsrobot.com
-----Original Message-----
From: news-gateway@lugnet.com [mailto:news-gateway@lugnet.com]On Behalf
Of Todd Lehman
Sent: Monday, August 09, 1999 4:50 PM
To: lego-robotics@crynwr.com
Subject: Re: Using the Motor as a Tachometer
In lugnet.robotics, "Ralph Hempel" <rhempel@bmts.com> writes:
> > Turning the motor increases the electrical potential (voltage) between • its
> > two contacts. If the motor isn't connected to anything, then its easy • to
> > turn - relatively little energy is required to make one of the motor
> > contacts sit at a higher potential than the other. If you short the • motor
> > contacts together, however, then you have a different situation. In • order
> > to maintain a difference in potential, you need a sizeable current • moving
> > through the wires. This requires a lot of work, thus its hard to turn • the
> > motor. Thus how "hard" it is to turn the first motor has to due with • how
> > much current needs to be moved in order to maintain a certain voltage.
>
> In fact, this is how the RCX motor controller internally sets the motor up
> for "brake" instead of "off"...
No way! Really? Too cool! Does it do this with some kind of switching
relay or is it purely electronic?
--Todd
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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