8891
General Mach Discussion / Re: configure drive for motors
« on: March 23, 2009, 06:36:02 AM »
Bill is right - it is better to purchase a ready made stepper controller.
The 4 wire bipolar stepper motors when operated in full step mode, in one direction, require current through one set of coils then for the next step current through the next set of coils then for the next step current is reversed through the first set of coils and so on.
The 5 wire unipolar steppers are a lot easier to drive from PICs because one wire is common + and the other wires are grounded in sequence to produce the rotation (there is no current reversal through the coils therefore only one switching transistor is required for each coil).
See the following Wiki. http://en.wikipedia.org/wiki/Stepper_motor
Tweakie.
The 4 wire bipolar stepper motors when operated in full step mode, in one direction, require current through one set of coils then for the next step current through the next set of coils then for the next step current is reversed through the first set of coils and so on.
The 5 wire unipolar steppers are a lot easier to drive from PICs because one wire is common + and the other wires are grounded in sequence to produce the rotation (there is no current reversal through the coils therefore only one switching transistor is required for each coil).
See the following Wiki. http://en.wikipedia.org/wiki/Stepper_motor
Tweakie.