Subject:
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Re: Motor power?
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 17 Feb 1999 01:26:19 GMT
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Original-From:
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dave madden <dhm@paradigm.webvision.(SayNoToSpam)com>
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Viewed:
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1174 times
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=>From: Dan McCabe <danm@seanet.com>
=>...
=>When I set the motor power (both in RIS and nqc), I expected the speed
=>of the motor to be proportional to the power setting (i.e., higher power
=>setting makes motor turn faster and vice versa). However, what I see is
=>that the power setting appears to have no impact on motor speed.
=>
=>Am I doing something wrong? Or is it just that I can't get there from
=>here? Any insights would be appreciated. (Yeah, I could do the PWM thing
=>in RCX code, but I hoped that the firmware did that sort of thing for
=>you; it would be faster and more efficient in firmware).
I think the power setting *is* doing PWM. I'm not an expert on
motors, but my understanding (from a previous message on this list, I
think) is that DC motor speed is proportional to voltage, and torque
is proportional to current. Since I think the PWM is turning the
motor on to the full voltage and then turning it off again, I would
expect the speed to be almost the same, particularly when the motor
isn't working very hard. I don't know how to change the motor's RPM,
or even whether it's possible.
d.
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message is in Reply To:
 | | Motor power?
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| When I set the motor power (both in RIS and nqc), I expected the speed of the motor to be proportional to the power setting (i.e., higher power setting makes motor turn faster and vice versa). However, what I see is that the power setting appears to (...) (25 years ago, 17-Feb-99, to lugnet.robotics)
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