Subject:
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RE: NXT Motors -- Speed vs Power Level
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Newsgroups:
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lugnet.robotics, lugnet.robotics.nxt
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Date:
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Thu, 3 Aug 2006 07:58:59 GMT
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Reply-To:
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<dickswan@sbcglobalANTISPAM.net>
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Viewed:
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5986 times
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> Daniele Benedettelli wrote:
> I tried to plot power levels vs angular speed (in rad/s) and
> discovered good linearity (remember how non-linear was RCX PWM)?
I've done the same measurements/plots and found same linearity when
'brake' on inactive PWM cycles is used. Not so good when 'float' is
used.
This leads to a conundrum that I simply can't explain.
If you use 'inactive brake' mode the motors start moving at power level
around 10 or less. Now if you use 'float' mode they don't start moving
until power level is around 40. This is totally counter intuitive. I
can't understand why a motor with 10% power on and 90% braking 'pulses'
starts moving before a motor with 40% power on and 60% coasting!
Can anyone think of a good explanation?
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