Subject:
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Re: Electromagnetic device
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Newsgroups:
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lugnet.robotics.nxt
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Date:
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Tue, 16 Jan 2007 13:53:49 GMT
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Viewed:
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10155 times
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Yes, you can use an electromagnet with the RCX. Depends on what you
want to do with it, but it should work. The device from a disk drive
might be a 12 volt device, or 5. The RCX puts out around 8-9, so either
way the device isn't drawing the correct current. It's probably got a
very high current draw, and causes your batteries to go low. Very much
like a motor on heavy load.
Finding an electromagnet that doesn't cause heavy drain will depend on
what you want to do with it. You want a coil rated for as close to 9
volts DC as possible, and as low power (watts) as possible. Note that
lower power will mean lower electromagnetic force, so you will have to
balance low power with whatever you are trying to do. If you're making
a crane with an electromagnet on it to lift up scrap metal, the power
level will determine how much stuff you can pick up. If you're using it
to connect train cars, it will determine how many cars you can pull.
A higher coil resistance will have a lower power at a given voltage.
Note that putting a resistor in line with the coil will probably not
help you.
Hope this helps.
-Jon
Patrick Levy wrote:
> Hi,
>
> I was wondering if it is possible to use a electromagnetic device with the RCX
> and NXT. I tried with this one from a disk drive, and it worked quite well, but
> a few seconds after it start, the RCX shows the "low battery" icon. (The
> batteries are OK, and when i checked later, it reports normal 8.0 Mv)
>
> 1. May I use some kind of resistor in the wires?
> 2. Why RCX reports low battery? It seems like motors on heavy load...
> 3. Is possbile to minimiz/avid this? How this impact in the electromagnetic
> performance?
> 4. If i must use a diferent/best electromagnetic device, what kind or
> specification i must look for?
>
> Thanks for any help!
>
> This is the electromagentic device plugged in the RCX:
> http://tdi-ng.locaweb.com.br/patrick/lego/internals/eletro.jpg
>
> Patrick
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Message has 1 Reply:
 | | Re: Electromagnetic device
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| Thanks everybody for the explanations! Everything start to make sense now. I understand that a resitor will limit only voltage across the circuit, but not current, this is very clear also. So, i will look for a small electromagnet, (9 volts) because (...) (17 years ago, 16-Jan-07, to lugnet.robotics.nxt, lugnet.robotics)
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Message is in Reply To:
| | Electromagnetic device
|
| Hi, I was wondering if it is possible to use a electromagnetic device with the RCX and NXT. I tried with this one from a disk drive, and it worked quite well, but a few seconds after it start, the RCX shows the "low battery" icon. (The batteries are (...) (17 years ago, 15-Jan-07, to lugnet.robotics)
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