Subject:
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Motor Speed value interpretation?
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Newsgroups:
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lugnet.robotics.rcx.legos
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Date:
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Tue, 23 Jan 2001 06:46:12 GMT
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Viewed:
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1283 times
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Hi all,
sorry if this question has been asked before but i was just wondering what
the speed values for the motors represent? i have a robot with two motor driven
wheels which i would like to be able to make drive in an arc. To do this i have
to set the motors at different speeds so that the angular velocities of the two
wheel shafts are at the right ratio for the arc. My problem is that the
relationship between the speed value eg 0 - 255, isn't in linear proportion to
the angular velocity of the motors drive shaft (which seems resonable since you
can only really specify a force for the motor since the angular velocity will
rely upon the weight of the robot). Does anyone know a formula for this
relationship so that i can work out the exact figures for the speeds of the
motors rather than put rotation sensors on the wheel shafts, since this is
providing to be quite difficult (not the actual watching of the rotation
sensors, but rather adjusting the speeds acording to what values you are
getting back, not difficult to do slowly, but difficult to get the robot to hit
the right arc quickly).
any help would be greatly appreciated.
thanks ross
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Message has 2 Replies:
 | | Re: Motor Speed value interpretation?
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| (...) Greetings! Another Ross!! That's three hangin' around here now!! Well, OK ones a Rossz, but it's close enough! (...) driven (...) have (...) two (...) you (...) hit (...) Well, you could work it out really carefully, but then you've gotta take (...) (24 years ago, 23-Jan-01, to lugnet.robotics.rcx.legos)
| | | Re: Motor Speed value interpretation?
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| (...) As far as I can tell, the speed value really affects power output. This indirectly affects speed, but not in a very happy way. You end up with a wide range of values that give you nearly the same speed, then a very short range that decreases (...) (24 years ago, 23-Jan-01, to lugnet.robotics.rcx.legos)
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