Stepper Motor Control - Ricoh FT4430 Service Manual

STEPPER MOTOR CONTROL

Both the lens drive
stepper motors. The stators of these stepper motors have four coils (labeled
A, B, A and B above), and the rotors are permanent magnets.
Pulse signals energize the four coils as shown in the above illustration. The
rotor turns in discrete steps.
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16 April '88
[M5] are