Subject:
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Re: dc motor blues
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Mon, 4 May 1998 18:43:24 GMT
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Original-From:
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Brett Anthony <ANTHONYB@ECS.saynotospamCSUS.EDU>
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Viewed:
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1527 times
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Hi All;
Along the same lines, I would LOVE to control my motors so they run
at constant speed under varying load. I know that it's theoretically
possible to sense the RPM of a PM DC motor by tracking the drive voltage as
the commutator makes and breaks. Has anyone tried using this as feedback in
a PWM control loop? I'm guessing that the PWM frequency would have to be at
least an order of magnitude greater than the motor RPM. Or would it just be
easier to use an encoder?
Brett Anthony
Research Technician
School of Engineering and Computer Science
California State University, Sacramento
e-mail: anthonyb@ecs.csus.edu
phone: (916)278-6253
fax: (916)278-5949
address: Brett Anthony
E&CS, CSUS
6000 J St
Sacramento CA 95819-6023
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