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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Tue, 30 Nov 2004 15:01:25 GMT
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Viewed:
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5417 times
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> > Has anyone done something at all similar to this? I'm aiming at geting
> > smooth, slow motor speed.
>
> You should definitely try Dick Swan's 10x firmware
> (http://news.lugnet.com/robotics/?n=22989). • ...
> I experimented this, it works extremely well (minor problem: some noise in the
> motors, similar to Spybot that uses the same regulation, but much less annoying
> because frequency is lower. Might also wear your motors prematurely but I don't
> think so).
I've been using a power/brake method (instead of power/float) for quite some time in
BrickOS. That was one of the first big steps in getting my Legway to work. (
http://www.teamhassenplug.org/robots/legway/ )
It allows you to program a robot to make smooth turns (slow, instead of stop, one
wheel). I imagine it's pretty close to what Dick Swan did in his firmware.
Although I'm not sure 128 speeds are required, because 8 seems to work just fine for
me.
I've been using type of speed control in my Connect Four robot, for quick and
accurate positioning. It uses a rotation sensor, and slows the motor as the device
approaches it destination.
I think it IS hard on the motors. Running them at a lower power setting causes a
bad noise, and I've had two motors go bad on my Connect Four robot. But that may be
because it's been running for like a year.
I also think this type of control will be harder on batteries.
Neither of these will stop me from using it, because it works very well.
Steve
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Message has 1 Reply:
 | | RE: Motor Speed Control
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| (...) The brake function (as far as I know) should not use more battery power as the short circuit is in the driver chip itself. The drivers are MOSFETs, so setting the H bridge to brake does not actually apply any battery power to the motor (...) (20 years ago, 30-Nov-04, to lugnet.robotics.rcx.nqc)
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Message is in Reply To:
| | Re: Motor Speed Control
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| Hello Iain, (...) You should definitely try Dick Swan's 10x firmware ((URL) Among other goodies (interpretation speed for example ;o), it features more power levels (128 instead of 8), and a flag to modify behavior of PWM motor control. Standard (...) (20 years ago, 30-Nov-04, to lugnet.robotics.rcx.nqc)
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