Subject:
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Controlling an Electromagnet (LSM)
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Sat, 24 Dec 2011 15:47:57 GMT
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Viewed:
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26787 times
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Hi all,
It's been a while! A long while ago, while in elementary school, I used LEGO to
build a manually-operated Linear Synchronous Motor (LSM) for a science fair
project. I want to revisit this as an adult and built a full test track with a
couple of vehicles operating at the same time.
To operate electromagnets from the outputs of the RCX, I don't think I can power
them directly from what I've read. The current draw is too high. I think I
need to use either a Relay (within my scope of experience) or a MOSFET (I've
never used one before).
http://www.techno-stuff.com/relay.htm
-Can anyone tell me why in this circuit there is a 22 ohm resistor inline with
the relays?
-Could I make a similar circuit using a MOSFET and have them turn the
electromagnets on and off?
Thanks in advance,
-Iain
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Message has 1 Reply:
 | | Re: Controlling an Electromagnet (LSM)
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| Iain, How much power do you want for the electromagnets, and how rapidly do you need to switch them on and off? Old-fashioned relays will give you the least power loss, but can't be switched very quickly. They also have a limited life (between 10 (...) (13 years ago, 24-Dec-11, to lugnet.robotics.rcx)
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