Stepper motor drive for computer numerical control machines

This work presents a open loop stepper motor driving, with configurable parameters, such as driving schema and nominal current. The developed system is based on microcontroller, monolithic switches and discrete analog electronics, aiming to reduce the overall cost. The building blocks employed on the system are briefly presented and are divided into: Digital Electronics, Analog Electronics and Power Electronics. Experimental results with the assembled system suggested the well behavior of current regulation for various driving schemas, such as half step and micro step ¼. The performance parameters from the experimental results were found to be reasonable and within expected. The system presented in this paper is part of a CNC routing system.