Subject:
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Re: Using the Motor as a Tachometer
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 9 Aug 1999 11:35:26 GMT
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Original-From:
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Jacob Schultz <ANNE.JACOB@GET2NETstopspammers.DK>
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Reply-To:
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C948605@STUDENT.DTU.DKsaynotospam
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Viewed:
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1110 times
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Todd Lehman wrote:
> One funny thing I noticed: I had to apply about twice as much torque to
> turn the wheel with the lamp attached to the motor as I did when the motor
> was hooked instead to a second motor. That is, it "felt" about twice as
> hard to turn the wheel at the same speed. Is this because the lamp is
> super-inefficient at converting electomagnetic energy to visible light,
> while a LEGO motor is super-efficient at converting electromagnetic energy
> back into kinetic energy?
Try to short circuit the motor used as tarcometer / generator, and you'll see.
Also try preventing the second motor from spinning, and you'll experience the
same thing. About efficiency: this is not what you are experiencing, but the
motor surely is more efficient than a lamp.
Jacob
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message is in Reply To:
 | | Re: Using the Motor as a Tachometer
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| (...) Dave, this use of a motor as an input is fascinating! (How safe is it? Looking at some older threads, there seems to be a difference of opinions, or at least a non-consensus that it's safe...) I just hooked an 1x2 LEGO incandescent lamp up to (...) (25 years ago, 8-Aug-99, to lugnet.robotics)
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