Subject:
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Re: Motor Speed Control
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Newsgroups:
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lugnet.robotics.rcx.nqc
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Date:
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Wed, 1 Dec 2004 20:09:14 GMT
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Viewed:
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6043 times
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> I'm not sure how the Swan firmware does it, but I have mine set so it cycles every 8
> ms. It's on for 0 to 8 ms, then off (brake) for the rest, depending on the speed.
That's the case too for Swan firmware with standard parameters.
> That's fast enough to produce a very smooth result. There is no visible starting &
> stoping of the motor, but I'm sure the effect on batteries is the same as above.
And yes, power consumption is much higher using on break. I measured variation
of RCX current with one motor, power level 3 (50% duty cycle). Idle RCX current
(35mA) is deduced.
Unloaded motor, on/float : 7mA
Unloaded motor, on/brake : 65mA
The difference is lower with a sligtly loaded motor:
Ligtly loaded motor, on/float : 35mA
Ligtly loaded motor, on/brake : 80mA
...and insignificant with a stalled motor:
Stalled motor, on/float : 135mA
Stalled motor, on/brake : 155mA
Philo
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Message is in Reply To:
 | | RE: Motor Speed Control
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| (...) :) (...) I'm not sure how the Swan firmware does it, but I have mine set so it cycles every 8 ms. It's on for 0 to 8 ms, then off (brake) for the rest, depending on the speed. That's fast enough to produce a very smooth result. There is no (...) (20 years ago, 30-Nov-04, to lugnet.robotics.rcx.nqc)
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