Micro-stepping in Stepper Motor

Principle of Micro-Stepping

• The rotor of the stepper motor does not rotate smoothly in the half step as well as full step operation but rotor rotates with some jerk when step angle changes.  
• The operation of stepper motor with micro step driving result in less vibration and low noise.  In order to achieve micro step operation.
• Magnitude of current is kept constant in the phase winding X and current magnitude increases from zero to maximum in the phase winding Y. 
• Similarly, the current magnitude of phase winding X increases from zero to maximum whereas the current magnitude of phase winding Y is kept constant.
• This will result in small step angle and it is called as Mini step or Micro step. 
• We can achieve 0.018^o with micro stepping, resulting 20,000 steps per revolution. Figure shows step mode and steps angle for micro stepping operation.

Micro – Stepping Drive

• The different mode of micro- stepping drive is explained here. 
• The step mode for 1/32 and corresponding step angle 2.9⁰  is given in this table.

Step Mode	Step Angle
1/1	900
1/2	450
1/4	22.50
1/8	11.30
1/16	5.60
1/32	2.90

 

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