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Hi all ! I need make a stepping motor 1.8 in micro-stepping mode in: 0,05 . who know to build it whith PIC ?? I will try with CI-3973 (Alegro), but I need a exemple to run it... (sorry my english...) |
micro-stepping pwm motor
Started by ●March 2, 2005
Reply by ●March 3, 20052005-03-03
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--- In , "Luis" <fzanoto@y...> wrote: > > > Hi all ! > I need make a stepping motor 1.8 in micro-stepping mode in: 0,05 . > > who know to build it whith PIC ?? > > I will try with CI-3973 (Alegro), but I need a exemple to run it... > > (sorry my english...) Hi Luis, The Allegro line of stepper motor controller chips includes full microstepping, up to 8x. your 1.8 per step motor could be controlled to 0.9 (half step) 0.45 (quarter step) and then 8x which would be 0.225 degrees. from there it is most common to use a gear reduction by using pulleys or some such. since you want better than 32 microsteps, you will need to design your own driver. Read the allegro data sheet http://www.allegromicro.com/techpub2/stp/stp01-2.pdf http://www.allegromicro.com/techpub2/stp/stp99-11.pdf and the Microchip data sheets AN907 - Stepping Motors Fundamentals AN822 - Stepper Motor Microstepping with PIC18C452 AN822 Source Code - Stepper Motor Microstepping with PIC18C452 AN906 Stepper Motor Control Using the PIC16F684 Once you understand the mathematical relationships between channels, you will be able to determine the duty cycle on each pulse stream for each axis. But, my recomendation is to get 400 setep per rev motor (0.9/step) and an 8x chip from Allegro and use timing belts to get the final movement you want. Dave |
