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Module 5: Introduction to motors

20242m

A variable reluctance stepper motor is constructed of material with salient poles:
(i) Paramagnetic
(ii) Diamagnetic
(iii) Ferromagnetic
(iv) Non-magnetic

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Answer

Correct Option: (iii) Ferromagnetic

Explanation

Variable Reluctance (VR) stepper: Rotor and stator salient poles made of soft ferromagnetic material (e.g., silicon steel, soft iron) with high permeability.

  • Ferromagnetic: Strongly attracted to magnetic field, low reluctance → torque via reluctance variation.
  • Paramagnetic: Weakly attracted, insufficient.
  • Diamagnetic: Repelled.
  • Non-magnetic: No interaction.

Rotor has no windings or magnets; torque produced by tendency to minimize reluctance (align poles).

Final Answer

Ferromagnetic → Option (iii).

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