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Microstepping a stepper motor works by

  • A.adding a mechanical reduction gear to the output shaft
  • B.increasing the number of stator poles in the machine
  • C.proportioning the currents in two phases to place the rotor between steps
  • D.reducing the supply voltage in proportion to the size of step that is wanted

Answer: C

Driving sinusoidally weighted currents in the two phases places the resultant field at any angle, so the rotor can be held anywhere between full steps. Smoothness improves greatly and the resolution becomes a matter of the driver rather than the machine.

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