Re: stepper motor speed ramp

"david austin" <[EMAIL PROTECTED]> wrote in message news:<[EMAIL PROTECTED]>...
> This site has a pdf with a neat method to generate timings for a linear
> ramp.
> It is quick enough to do in real time in a timer-comparator ISR on a PIC.
> 
> http://mysite.freeserve.com/stepper

A linear ramp isn't all that helpful in accelerating a stepper motor.

If your maximim stepping rate is higher than the first resonance
frequency of the stepper motor you are using, you do have to chose
your acceleration sequence with the resonant frequency in mind, and an
arbitrary linear ramp probably won't serve. Read Douglas W. Jones on
the subject.

http://www.cs.uiowa.edu/~jones/step/physics.html

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Bill Sloman, Nijmegen