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14-48
STEP "1"
Engine control unit
When coil A2 is energized instead of coil Al, the
lower half of stator I becomes an N pole. This
means that the N pole is moved one step to the
right compared to the condition in Step 0. As a
STEP "2"
When coil B2 is energized instead of coil Bl, the
lower half of stator II becomes and N pole. This
means that the N pole is moved one step to the
right compared to the condition in Step 1. Thus, as
in step 1, the rotor rotates one step to the right.
Each time a different pair of coils energized as
shown above, the rotor rotates one step.
Power
Stepper motor
Power
Stepper motor
When the coil energizing sequence is as Al, B! 3
When coil pairs are energized in the reverse
sequence, namely in the order Bl, Al + Al, B2 -)
counterclockwise.
result, the S pole of the rotor is attracted to the N
pole of the stator and the rotor moves, or rotates,
one step to the right.
rotates clockwise.
I
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