Help me rotate a unipolar stepper motor in small angles

[Thayas]

Hi all..
Im using six wire unipolar stepper motor(7.5degrees).
im able to rotate in half step mode..
Now i want to rotate in small angles(7.5).
I hav no idea..Plc anyone can guide me..

Regards
Thaya

 

[A.Anand Srinivasan]

Re: Micro stepping

step is the angle that the stepper motor rotates for each clock cycle.. so to achieve that small angle you are talking about i think you have to gate just one pulse of the clock to the stepper motor....

Regards

 

[Thayas]

Re: Micro stepping

Ya..i culd rotate the stepper motot at 90 degrees.now i want to control it small angles(7.5 degrees)

 

[A.Anand Srinivasan]

Re: Micro stepping

ya i understand that... to achieve that you have to send just one clock tick for each 7.5 degree that you want the stepper motor to rotate....

 

[foxabilo]

Micro stepping

if you have a 6 wire motor, it could be either a 3phase 2 wires per phase or a 5 phase 1 wire per phase + common, If it is a 5 phase then you can get a stepping resolution of around 125,000 positions per revolution.

This is archived because all multi phase "brushless" motors have "magnetic gearing" see https://www.infolytica.com/en/coolstuff/ex0106/Magnetic Gear B Field.avi
Each revolution requires the inner core to go though a large number of rotations before the outer core rotates once, and if each magnet is turned on one by one then you can see the tiny amount of outer movment even in a 3 phase motor.