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A stepper motor driven from a constant-voltage supply loses torque at high stepping rates because

  • A.the driver reduces the current deliberately at the higher stepping rates
  • B.the winding inductance prevents the current from reaching its full value
  • C.the rotor teeth begin to saturate at high stepping rates
  • D.the detent torque grows steadily with the stepping rate

Answer: B

Each phase has only a fraction of a millisecond to establish its current, and the inductance limits how far it gets. Chopper drivers with a high supply voltage and current regulation are what recover the high-speed torque.

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