Hi guys.. sorry for another off topic post.
Current project includes driving two nema23 bipolar stepper motors of 2.8 amps per phase. This application requires very smooth, quiet, low speed operation. I've been researching for a few days and I do not believe there is an off the shelf stepper chip that's going to meet those somewhat demanding requirements. I know the L297 can do half stepping, but I don't think it's enough honestly. I think an AVR sensing the current of each motor winding and chopping accordingly is the way to go. So with that in mind, I have some questions...
- Anyone have a project like this going?
- Any ideas on sensing the winding current that are a little more elegant than a sense resistor?
- Anyone ever tried "current ramping" like the linistepper uses?
I'm open to any suggestions and comments. Thanks guys.