The “current probe” view of Figure 4 is shown in Figure 5. Let’s call this a “coarse microstepping” and extend what we learned about the half-step sequence to microstepping. Just by turning the appropriate phase off before reversing the current we can generate four extra steps and create an eight step sequence giving us 400 steps per revolution. The whole half-step sequence is shown in Figure 4. We just do what we did in the full-step mode and that is turn on phase B in the opposite direction as shown in Figure 3 Figure 3: Half stepping What do we do to make it move to the 1.8 degree position? Figure 1: Half step sequence start positionīut this time, instead of changing phase B’s current direction, we’ll just turn it off as shown in Figure 2 Figure 2: Half step position, Phase A ON – Phase B OFFĪnd the shaft moves only 0.9 degrees or half the full step distance, hence the name “half step.” (Complicated, huh?)
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