Subject:
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Re: Controlling a DC motor 3
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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 05:04:03 GMT
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Original-From:
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Will Bain <willbain@*nomorespam*cs.umt.edu>
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Viewed:
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1501 times
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At 07:07 AM 5/4/98 +1000, Paul wrote:
> Q) The PWM is a sequence of pulses switching on & off the H-Bridge.
> But what should be the rate of PWM? 1000Hz?? why? what does the
> rate of PWM depends on?
Within limits, the rate doesn't matter much. What matters is the ratio of
off time to on time (i.e., the duty cycle). Probably, you could change the
frequency by an order of magnitude either way and get about the same results.
--Will
, ,
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~~~~~~~~~ ' ` ~~~~~~~~~~~ ` ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Wendy Parson, Suburbia is where the developer bulldozes out
Will Bain, the trees, then names the streets after them.
& Tatoosh --Bill Vaughn
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Message has 1 Reply:
 | | Re: Controlling a DC motor 3
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| (...) Actually, the frequency is somewhat important. The faster you switch, the more power will be lost to the switching of the power transistors and the filtering effect provided by the inductance of the motor. At the other extreme, frequencies (...) (27 years ago, 5-May-98, to lugnet.robotics.handyboard)
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