Re: [CAD_CAM_EDM_DRO] Stepper speed

In a message dated 04-May-01 02:45:03 Central Daylight Time, wanliker@...
writes:

> how many RPM will a stepper turn?

Bill: I have no experience with the driver circuits mentioned, but for
purposes of your question, I imagine they are "about the same". For a
stepper to turn faster than about 150 RPM, it must be "accelerated to speed"
and "decelerated to standstill", and that takes a "computerized" controller,
or VERY-sophisticated "sequential logic" for the purpose.

Using a stepper to turn a prop in a model boat is East European Engineering.
Use some simpler-to-use DC motor, even one of the new "brushless" kind (which
require their own "electronics" to work, but some have all that "built-in")

A controller for larger steppers, for "serious machinery", can step up into
low tens of thousands of steps per minute, so, dividing by 200 (steps/turn),
you might see 3000 RPM on some Size-23 or -34 motors for which those
controllers were designed. And those controllers would weigh several times
as much as a size-34 motor! Like the NYC taxi-driver will say, "Fo-GED
abowdit!"

Jan Rowland, Lurking Troll


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