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There are basically three types
of stepping motors; variable reluctance, permanent magnet
and hybrid. They differ in terms of construction based on
the use of permanent magnets and/or iron rotors with
laminated steel stators.
The variable reluctance motor
in the above illustration has four "stator pole sets" (A, B,
C,), set 15 degrees apart. Current applied to pole A through
the motor winding causes a magnetic attraction that aligns
the rotor (tooth) to pole A. Energizing stator pole B causes
the rotor to rotate 15 degrees in alignment with pole B.
This process will continue with pole C and back to A in a
clockwise direction. Reversing the procedure (C to A) would
result in a counterclockwise rotation. |
