Re: [CAD_CAM_EDM_DRO] Re: PWM vs Constant current

turbulatordude wrote:

>you could match motors and power supplies and drive the driver with a
>very uniform pulse stream. Do I remember correctly when the whole
>G200x came out that he ran at 200,000 hz ? on a 10 microstep driver
>that is 20,000 full steps per second. divide that by 200 steps per rev
>to get 1,000 steps a second, and multiply that times 60 ?
>
>

Well, I was doing this in 2001 with my first Universal Stepper Controller.
It could do up to 300,000 step/sec, per axis. For the 1440 RPM with the
Gecko 201A, that is 24 revs/sec, 4800 full steps/sec, or 48,000
microsteps/sec.
And this is with a real load on a size 34 motor.

>I remember 200,000 hz, but am not sure if it was into a stepper or a
>servo.
>
>

Most likely a servo. I have a router customer who is running 300,000
steps/sec
with my USC and Gecko 320 drives. No practical stepper motor is going to
run that fast. (200,000 steps/sec on a x10 microstepping driver is 100
revs/sec
or 6000 RPM on a 200 step/rev motor. I wouldn't want to stand too close
to that!

Jon