Subject:
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Re: LEGO Electro-magnet
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Newsgroups:
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lugnet.robotics
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Date:
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Sun, 15 Apr 2001 17:23:43 GMT
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Viewed:
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1750 times
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Rainer Balzerowski <balze2@gmx.net> wrote in message
news:GBuG0y.EAv@lugnet.com...
> Hi all,
>
> there is another thing you should think about. When using an • electo-magnet, you
> use a coil. This coil stores energie, so if you switch it off, the coil • gives
> this energy free. (This is the energy your ignition-sparks gets from an
> ignition coil in your car). This might damage your RCX. You should use a • diode
> (1N4007 for example) to unload this energy. Attach the diode in the
> blocking direction. Now you have to be sure to attach it the right way. • (Or use
> another diode in series to proof right connection).
> We used such a magnet in a contest. Look here for the Drops collector :
> http://www.informatik.fh-hamburg.de/~lego/Projekte/projekte_englisch.html
> (We used the magnet of a 6V Finder relay, which was able to hold a 500g • hammer
> with a current of ca. 30mA)
> Rainer
Because motors also contain electromagnets, I imagine they would have the
same problem, so does the RCX have built-in protection against this?
--
Philip Taylor
http://robowarriors.ultrastore.com
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Message has 1 Reply:
 | | Re: LEGO Electro-magnet
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| Hi Philip, may be, but I would chose the safe side (We did with our 6.270 board and used 2 diodes, who cares about 2 diodes). BTW I'm not sure what happens with the energy in an electro motor. I can imagine that this energy (resulting in a magnetic (...) (24 years ago, 15-Apr-01, to lugnet.robotics)
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Message is in Reply To:
| | Re: LEGO Electro-magnet
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| Hi all, there is another thing you should think about. When using an electo-magnet, you use a coil. This coil stores energie, so if you switch it off, the coil gives this energy free. (This is the energy your ignition-sparks gets from an ignition (...) (24 years ago, 15-Apr-01, to lugnet.robotics)
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