Stepper motors micro Step

TJHJ

Anyone have anything done that can drive a stepper motor with micro stepping. I was looking at just writing one, but the phase angle per step confuses the hell out of me. I was thinking of using the ST VNH3SP30 30 amp H bridge driver. To be able to control up to a 20 amp bi polar stepper motor.

Thoughts suggestions Ideas?

Thanks,
TJ

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I owe everyone here a bunch, So thanks again for answering my dumb questions.
Projects. RG500 ECU system. PropCopter. Prop CanSat. Prop Paste Gun.
Suzuki RG500 in a RGV 250 frame.
Bimota V-Due (Running on the fuel injection system)
Aprilia RS250

T Chap

OT for Prop, but I built drivers using Allegro A3986 which has 1/16 steps. You could probably do some tricks with the current trip with a divider to get 30 amps sensing/limiting ability, you'd need external n channel mosfets which could handle 30 amps. The driver you are looking at is not designed for a stepper.

Philldapill

TJ, I'm working on something like this. It's a dual H-bridge driver, but it can easily be used for driving a stepper. I've got the power stage finished, and I'm working on the logic controls now. I'm thinking the Propeller would be a great fit for this. Using the propeller, I could allow it to control at least 5 steppers(1 stepper per cog, plus 3 other cogs for data communication and housekeeping). The Amperage rating would only be 20A continuous, so it probably couldn't drive a 30A load for too long... Message me if you want some schematics or a finished device.

Christof Eb.

Hi TJ,

some months ago, I did some trials:

http://forums.parallax.com/forums/default.aspx?f=25&m=247204

Good luck!

Christof

Philldapill

Upon looking at your part further, TJ, you might try the VNH2SP30 instead. It has 19 mOhms per H-bridge leg, vs. the 34mOhm/leg for the VNH3SP30. Plus, the VNH2SP30 is the device that Parallax uses for the HB-25. Oh, and you can get some samples to try for free from ST. I just snatched some up. [noparse]:)[/noparse]

This device looks to be pretty amazing... I may have to redesign my own stepper driver now. [noparse]:([/noparse]
(Which is actually a good thing, so maybe I should have a [noparse]:)[/noparse] instead.)