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24/12/2021

Multi Stack Variable Reluctance ( VR ) Stepper Motor

 

Figure shows four stack variable reluctance stepper motor.  We can achieve low step angle by multi stack variable reluctance stepper motor.

  • The stator has common frame and rotor has common shaft in the multi stack variable reluctance stepper motor. 
  • Each stack is parallel to shaft axis and its excitation is given by separate winding.
  • The number of stator poles is equal to number of rotor poles. 
  • If there are 20 teeth in the four stack VR stepper motor, the step angle becomes 4.50.



multi-stack-vr-stepper-motor.png


Step angle ( θ ) = 3600 / S

          Where S = 4 ( Number of stacks ) × 20 ( Number of rotor teeth )

                        = 80

Therefore Step angle ( θ ) = 3600 / S

                                          = 3600 / 80

                                          = 4.50

Advantages and Disadvantages of VR Stepper Motor

Advantages

  • Higher stepping rate is possible
  • Low inertia of rotor
  • Light weight
  • Freely rotation of rotor

Disadvantages

  • Nil detent torque
  • Higher efficiency for low stepping rate


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