Subject:
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Re: What is RPM of Gear Motor???
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 7 Jul 1999 03:06:00 GMT
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Original-From:
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Luis Villa <liv@duke.edu+saynotospam+>
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Viewed:
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813 times
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On Tue, 6 Jul 1999, Dave Baum wrote:
>
> Keep checking the math. I clocked the motor at 330 - 350 rpm. I used the
> rotation sensor driven directly by the motor. From analysis of the RCX
> firmware, the rotation sensor should be accurate to 1250 rpm, so I'm
> pretty confident of it being in the 350 range.
Dave-
Where are you getting that 1250 rpm upper limit from? While I haven't
counted exactly yet, I'm dropping only 20 counts out of every
thousand at ~15,000 rpm. I had assumed this was mainly gear slop,
since it only appears to occur while driving the rotor in one direction
and then stopping violently, which lets my gearing assembly roll a little
bit even after the driving arm has bee stopped. Let me know about your
analysis-
Luis
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--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message has 2 Replies:
 | | Re: What is RPM of Gear Motor???
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| Using a Futaba 9ZAP radio with a built in optical tachometer and the two bladed LEGO prop I got 380 rpm for the gearhead motor and 4320 rpm for the older nongeared motor. Of course this was done with a battery box and brand new batteries so I am (...) (25 years ago, 7-Jul-99, to lugnet.robotics)
| | | Re: What is RPM of Gear Motor???
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| My memory is a bit fuzzy here since it was a while back, but according to my notes... * sensors are sampled every 3ms * rotation sensor is a quadrature encoder with a 4:1 gearing in front of it (one rotation of the axle yields 16 "ticks"). * sensor (...) (25 years ago, 7-Jul-99, to lugnet.robotics)
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Message is in Reply To:
| | Re: What is RPM of Gear Motor???
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| Keep checking the math. I clocked the motor at 330 - 350 rpm. I used the rotation sensor driven directly by the motor. From analysis of the RCX firmware, the rotation sensor should be accurate to 1250 rpm, so I'm pretty confident of it being in the (...) (25 years ago, 6-Jul-99, to lugnet.robotics)
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