Subject:
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dc motor blues
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Fri, 10 Apr 1998 07:20:53 GMT
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Original-From:
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Patrick Cutts <patrick@[StopSpam]surfari.net>
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Reply-To:
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<[patrick@surfari]IHateSpam[.net]>
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Viewed:
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1648 times
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After driving all my robots with step motors, I finally decided to try
driving one with DC motors. I got a couple of the lego gearmotors, and
mounted them on my robot with belts driving the wheels at a reduction ratio
of about 1.5:1, and have been doing some experimenting with the different
speeds.
I am very surprised at the lack of change between speed 11 (which is the
slowest speed that will actually make the motor turn), and speed 100. As
near as I can tell there is an 18 rpm difference between speed 11 and speed
100. The difference is so small that I can't see any difference when I run
my robot across the floor at any speed. (given that speed 11 results in
183 rpm at the wheel, that is less than a 1% change!)
Has this been the case with any of you? Am I doing something wrong? I
don't want to have to go back to step motors! Please email me with your
experiences!
Note: I am using IC 3.2, but I don't know if the new 'smooth pwm routines'
are in there. Anybody know how I can tell? and if they're not, how do I
implement them?
thanks for any insight you can give me.
-patrick
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Message has 1 Reply:
 | | Re: dc motor blues
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| yup, here's what's going on. the motor percent argument controls the POWER, not the speed. if the motor is essentially unloaded, it will run at nearly full speed even at a low power percentage. if you build a gear train that makes the motor do some (...) (27 years ago, 10-Apr-98, to lugnet.robotics.handyboard)
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