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 19:36:48 GMT
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Viewed:
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1507 times
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Well, good work Philip.
Good to be sure about this.
I was only afraid that you'll frie your RCX, because of not knowing this
effect.
Regards,
Rainer
P.S.: Learned something, not unload diode, but flyback diode ! ;-)
In lugnet.robotics, Philip Taylor writes:
> I've found a book which mentions this, and talks about using 'flyback
> diodes' when "switching inductive loads such as motors" -- it appears that
> motors do have this problem.
>
> Apparently the RCX uses three ELEX 10402B motor driver chips, and the
> description on their web-site
> (http://ecom.melexis.com/mlx_profile.cgi?BU=Standard_Product_Actuator_ICs&fa
> mily=MLX10402) says:
> "The IC drives directly small DC inductive or active loads like electric
> motors, lamps, etc." . . . "The current of the output-drivers is limited for
> protection against all kind of overload and short-circuit conditions, and
> this in the whole supply voltage and temperature range. The outputs 'M1' and
> 'M2' are on-chip diode-protected against motor inductances (Nominal values
> of 12mH and 12 Ohm)."
> so they are definitely diode-protected, and you don't have to worry about
> melting your RCX :-)
>
> --
> Philip Taylor
> http://robowarriors.ultrastore.com
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Message is in Reply To:
 | | Re: LEGO Electro-magnet
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| Rainer Balzerowski <balze2@gmx.net> wrote in message news:GBuGyD.Fzn@lugnet.com... (...) used 2 (...) the (...) electro (...) I've found a book which mentions this, and talks about using 'flyback diodes' when "switching inductive loads such as (...) (23 years ago, 15-Apr-01, to lugnet.robotics)
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