1. Stepper Motors
BJ Furman
23MAR2011

2. Stepper Motor Operation - Full Step Mode
Rotor and Stator A1 B1 A2 B2 S N

3. Stepper Motor Operation - Full Step ModeB1 A2 B2
high
Step 1a N S
Energize windings:
A1 and B1 high
A2 and B2 low S
high
low N S
low

4. Stepper Motor Operation - Full Step ModeB1 A2 B2
high
Step 1b N S
Energize windings:
Rotor moves to align with net magnetic field
high S
low N S
low

5. Stepper Motor Operation - Full Step ModeB1 A2 B2
low
Step 2a
Energize windings:
A2 and B1 high
A1 and B2 low S
high S S N
low N N N
high

6. Stepper Motor Operation - Full Step ModeB1 A2 B2
low
Step 2b
Energize windings:
Rotor moves to align with net magnetic field S
high N S N
low S N N
high

7. Stepper Motor Operation - Full Step ModeB1 A2 B2
low
Step 3a
Energize windings:
A2 and B2 high
A1 and B1 low S
low N N S S
high N N
high

8. Stepper Motor Operation - Full Step ModeB1 A2 B2
low
Step 3b
Energize windings:
Rotor moves to align with net magnetic field S
low N N S S
high N N
high

9. Stepper Motor Operation - Full Step ModeB1 A2 B2
high
Step 4a
Energize windings:
A1 and B2 high
A2 and B1 low N
low N N S S
high S S
low

10. Stepper Motor Operation - Full Step ModeB1 A2 B2
high
Step 4b
Energize windings:
Rotor moves to align with net magnetic field N
low S N S N
high S S
low

11. Stepper Motor Operation - Full Step ModeB1 A2 B2
high
Step 1a N S
Energize windings:
A1 and B1 high
A2 and B2 low S
high
low N S
low

12. Stepper Motor Operation - Full Step ModeB1 A2 B2
high
Step 1b N S
Energize windings:
Rotor moves to align with net magnetic field
high S
low N S
low

13. Stepper Motor Operation - Half Step Mode
Step 1a
Energize windings:
Just B1 high
A1, A2 and B2 low A1
low B1
high S B2 S S N N
low N A2
low

14. Stepper Motor Operation - Half Step Mode
Step 1b
Energize windings:
Rotor moves to align with net magnetic field
Only 45 deg. rotation! A1
low B1
high B2 S S N S N N
low A2
low

15. Stepper Motor Operation - Half Step Mode
Step 2a S A1 B1 A2 B2
low
Energize windings:
A2 and B1 high
A1 and B2 low S
high S N S N
low N N
high

16. Stepper Motor Operation - Full Step Mode
Step 2b S A1 B1 A2 B2
low
Energize windings:
Rotor moves to align with net magnetic field S
high N S N
low S N N
high