Electrical Machines
The armature shaft must be able to with stand

 Twisting stains due to transmission of torque.
 Bending moment due to weight of the armature.
 Any unbalanced magnetic pull on the armature core.
All of these

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Electrical Machines
In a stepper motor the detente torque means

  minimum of the static torque with the phase winding unexcited.
  maximum of the static torque with the phase winding unexcited.
  minimum of the static torque with the phase winding excited.
  maximum of the static torque with the phase winding excited.

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