The simpler drives that just provide full and half step often do so by
using full energisation of two coils to get the full step position and
full energisation of only one coil to get the half step position. If
your drive operates that way, then the delivered torque will be
maximum when stepping from the half to the full step position, and
less (by a factor of root-2) when stepping to a half step position.
In microstepping drives (i.e., drives that offer more tnan just full
and half steps), the torque is constant through the microsteps, as two
coils are always energised; the current in each coil is adjusted so
that the rotor comes to rest at 4, 8, 10, ... whatever....different
positions according to how you have set the number of microsteps.
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