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 00:16:07 GMT
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Reply-To:
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Geoffrey Hyde <gdothyde@^NoSpam^bigponddotnetdotau>
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Viewed:
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10231 times
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"Patrick Levy" <patrick@omiccron.com.br> wrote in message
news:JBxJ1I.En@lugnet.com...
> 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
Well, naturally there's going to be a heavy current drain on your batteries
when you use an electromagnet with the RCX.
You didn't post the technical specifications of the electromagnet you have
wired up to the sensors, did it have a data or specs sheet that came with
it?
It all boils down to what the electromagnet's P = I * V calculations work
out to.
Quote from HowStuffWorks webpage below:
[quote]
The three most basic units in electricity are voltage (V), current (I) and
resistance (r). Voltage is measured in volts, current is measured in amps
and resistance is measured in ohms.
[endquote]
I took a look at various webpages, although howstuff works has a good basic
explanation of electrical current theory for household appliances here:
http://www.howstuffworks.com/question501.htm
The principles are the same for the electromagnet, once you work out what it
consumes you can work out what it draws as a load.
It's a lot more complex than it looks, but this should get you started on
what you need to look for in an electromagnet.
Cheers ...
Geoffrey Hyde
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Message has 1 Reply:
 | | Re: Electromagnetic device
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| (...) I would add that it will take some experimenting to get the parameters correct. Pick your operating conditions (parallel outputs, or no, etc...) and then given the supply voltage and maximum current allowance, you know the coil resistance you (...) (17 years ago, 16-Jan-07, to lugnet.robotics.nxt)
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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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