Stepper Motors

Stepper motors are a special case of Brushless DC Motors. Construction is identical except that they contain no position sensors. Excitation is sequentially applied to the windings, creating the rotating field to produce torque.

Uses:
  • Low torque applications
  • Open loop micropositioning
  • Timer switching

Advantages
  • Simplicity
  • Compatability with digital control schemes

Disadvantages
  • High continuous power dissipation
  • High ripple torque

Used for noncritical, low power applications, since positional information is easily lost if acceleration or velocity limits are exceeded.

See also: Brush DC Motors, Brushless DC Motors, Electric Motors.

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Subjects: Electronics