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lt paul
04-14-2004, 08:06 PM
Does any one know if you can up the capacity of a bipolar microstepping driver by attaching mosfets to the outputs or if not how to up the capacity or build one using a pic or something

thanks

pminmo
04-14-2004, 08:52 PM
Not easily, by nature a microstepper has to have a chopped output to hold in unatural magnetic positions. Chopping requires control and feedback much more complicated than a simple state table.

Mariss Freimanis
04-15-2004, 12:57 AM
I guess what you want to do is to take a 90-lb weakling everyone kicks-sand-in-the-face drive and turn into a buff 250-lb weight-lifter doing the sand kicking.

Well, you can't do it just right now but: We will be offering an 80VDC, 10A dual bridge drive core you'll be able to add your own controller to.

It will have a Geckodrive (2.5" by 2.5" footprint) and will feature overcurrent protection, overtemp protection, reverse-polarity protection, motor-disconnect protection, load-dump protection, load short-circuit protection, undervoltage protection, etc, etc. In otherwords, it will be an unkillable dual bridge power circuit you'll be able to add your own homebrew control circuit to.

Make it a step motor drive, a dual servo drive or a brushless DC drive. Do other wierd stuff I haven't even thought of. It'll just be a destruction-proof, big-time power amplifier.

Price and availability not determined and not done yet respectively. Give another 4 to 6 weeks. It will be the power section core of the upcoming G204V Vampire drive (Vampire as in you can't kill it) and it will be sold sperately.

Mariss

creative_mind
04-15-2004, 12:23 PM
It paul,

Have a look at the Microchip application notes on microstepping bipolar motors using a PIC.

www.microchip.com/1010/suppdoc/appnote/all/an906/