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STEPPER MOTORS-INTRODUCTION

  • A stepper motor is an incremental motion machine (i.e. the motor which turns in discrete movement called the steps). It does not rotate continuously as a conventional motor does.
  • The stepper motor is a special type of synchronous motor which is designed to rotate through a specific number of degrees for each electrical pulse received by its control unit.

Typical steps are 2°, 2.5°, 5°, 7.5° and 15° per pulse. These motors are built to follow signals as rapid as 1200 pulses per second and with equivalent power ratings upto several kW.

  • The stepper motor is used in digitally controlled position control system in open loop mode.

The input command is in the form of a train of pulses to turn a shaft through a specified
angle.