Subject:
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Re: When is "off" off?
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 13 Jun 2006 14:51:18 GMT
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Viewed:
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2708 times
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In lugnet.robotics, Mitchell Lichtenberg wrote:
> If I attach a motor to a battery box and twist the motor arbor I get resistance
> EVEN if the battery box is switched off. This means that the current,generated
> by the motor, is getting through, correct? Is the current just bridging the
> contacts or is it going through to the batteries? Is there a 'drain' condition
> if motors are left plugged into battery boxes or RCXs? I know the gurus out
> there can give me an answer. Thanks.
The RCX has the capability to place a resistance accross its output terminals.
Removing that resistance provides the free spinning behavior enabled by one of
the programmable features. Inserting the resistance gives tighter control of
motor speed. I don't have a schematic handy, but there's no conceptual reason
why providing resistance across an output has to require power from the supply.
-Ted
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Message is in Reply To:
 | | When is "off" off?
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| If I attach a motor to a battery box and twist the motor arbor I get resistance EVEN if the battery box is switched off. This means that the current,generated by the motor, is getting through, correct? Is the current just bridging the contacts or is (...) (18 years ago, 13-Jun-06, to lugnet.robotics)
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