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Mid-frequency resonance in a stepper motor drive causes

  • A.the holding torque to rise while the machine is stationary
  • B.loss of torque and possible loss of steps at particular rates
  • C.an increase in the torque that is available at those particular stepping rates
  • D.the machine to run smoothly at exactly those rates only

Answer: B

The rotor oscillates about each new step position, and at rates near that natural frequency the oscillation builds up and can stall the machine. Damping, microstepping or simply avoiding the affected range are the remedies.

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