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- Newsgroups: comp.robotics
- Path: sparky!uunet!munnari.oz.au!uniwa!cujo!cc.curtin.edu.au!syawanar
- From: syawanar@cc.curtin.edu.au
- Subject: Re: Trouble with stepper motor
- Message-ID: <1992Sep2.144538.1@cc.curtin.edu.au>
- Lines: 32
- Sender: news@cujo.curtin.edu.au (News Manager)
- Organization: Curtin University of Technology
- References: <1992Aug14.214916.4173@colorado.edu>
- Date: Wed, 2 Sep 1992 05:45:38 GMT
-
-
- > I've got a 4-phase stepper motor that I'm trying to control, by
- > sending it the required sequence of 4-bit patterns (1001, 1010, 0110,
- > 0101, repeat), and the motor runs for 2-6 seconds (hundreds of steps)
- > and then it gets confused and just starts wiggling.
- >
- > Has anyone else had this problem?
- >
- > The motor behaves as it would behave if it had gotten out of
- > synchronization with the step commands, but I can't imagine why this
- > would suddenly happen after hundreds of successful steps.
- >
-
- It may not be the motor at all but the circuitry. After hundreds of steps,
- it may have been possible for propagation delay to cause a major loss
- of syncrhrocity. (You did mention that it does hundreds of steps in just
- a few seconds) so this may well be the problem. Try analyzing the logic
- output when the trouble starts.
-
- Possible solutions would be to use faster chips or simplify the circuit
- to less states.
-
- Hope this was of help.
-
- -Naveen-
-
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