REDUCTION GEAR STEPPER MOTOR



  •     Fig. 7.9 shows a reduction gear stepper motor. The stator has 8 salient poles and four phases for use as exciting winding.
  •     The rotor has 18 teeth and 18 slots uniformly distributed around. Each salient pole of the stator consists of two teeth, forming an interleaving slot of the same angular periphery as the rotor teeth or slots.
  •     When the coil A-A’ is excited, the resulting electromechanical torque brings the rotor to the position as shown in the Fig. 7.9.





                                                       Fig. 7.9 Reduction gear stepper motor

  •     With this arrangement, the step angle reduces to 5°. By successive excitation of coils A- A’, B—B’, C—C’ and D—D’, the rotor makes 72 steps to complete one revolution.
  •     The general relationship between step angle a , number of stator phases q and rotor poles or teeth N remains at an angle  as,



  •     By choosing different combinations of number of rotor teeth and stator phases, any desired step angle can be achieved.

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