Subject:
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Re: lego robot servomotor
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Fri, 5 Jun 1998 22:11:50 GMT
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Original-From:
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William Bain <willbain@csSTOPSPAM.umt.edu>
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Viewed:
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1261 times
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> From: GJZ@aol.com
> i have a motor that is manufactured by lego, and has a 4 pin connector which
> is in the shape of a lego block. i am new to lego robots, so i do not know
> what the various parts look like exactly. the motor that i have is about
> 1.25" cube, and seems to be geared down slightly. does anyone know if lego
> manufactures DC motors that are geared down, or any DC motors at all, or just
> servo motors. i think that this is a servo, and i also need to find
> literature for this device, as i do not have any. can anyone help me identify
> this device? thanks for your help.
What you have is most likely a 9V DC motor, not a servo. As far as I know,
there is no such thing as a Lego servo motor. The four-contact plug is a Lego
standard that allows changing the polarity simply by rotating the plug 90
degrees. There are actually just two wires going to the motor.
There are two main types of 9V Lego Technic motor: the old, non-geared style
and the new gear motor. (There are also the Technic micro-motor and various
non-Technic motors, like the kind that come with the railroad sets). The
Technic gear motor has the contacts recessed into the top and a slot for the
wire also in the top. The regular (non-gear) motor is a plain old rectangular
block shape with the contacts on the bottom.
Both types of Lego Technic motor seem to be quite efficient and can be run
directly from the HB without the need for a separate motor battery pack. I
think that the new gear motors are better than the old, block-shaped motors,
mainly because they're more compact (require fewer external gears to achieve
usable RPM) and probably more efficient, too. At $18 or so, the new gear motor
is about the least expensive gear motor you'll find.
I have been unable to find any specs on these motors, but then I haven't really
looked for 'em.
--Will
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