Subject:
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9v Gear Motors
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 8 Jun 2000 21:40:01 GMT
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Viewed:
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672 times
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I have been searching lugnet for more info on the standard Lego 9v
gearmotors. I know there are 4 terminals. I know there is forward, reverse,
off (with braking) and float (without).
Mark Overmar's NQC tutorial which is included with Dave Baum's book/CD has a
scheme to vary the speed by turning it off and on many times a second. I
absolutely do not understand the code, but it works anyway! He says: "It
constantly checks the variable speed to see what the current speed is." But
is there speed monitoring, or current monitoring, or even something that would
tell the RCX motor direction?
If anyone knows how the motor works, or has any good links, let me know.
Thanks, Jerry
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Message has 2 Replies:
 | | Re: 9v Gear Motors
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| The motors are DC motors, with two terminals. A DC motor will reverse direction if the current direction is reversed. If the circuit to the motor coils are left open, no magnetic field is produced and the motor has no resistance to turn, so there is (...) (24 years ago, 8-Jun-00, to lugnet.robotics)
| | | Re: 9v Gear Motors
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| There's nothing specially clever about the 9v geared motors. There are in fact only 2 terminals. The 4 connectors you see are just LEGO's clever way of supplying power to the motor regardless of the orientation of the power connector wire. So (...) (24 years ago, 8-Jun-00, to lugnet.robotics)
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