Electrical Machines
In dc machines, the field system has to be provided on stator unlike synchronous machines Where in it could be on any member, because

 commutator action is not possible otherwise
 it reduces field structure iron losses
 it gives more uniform air-gap flux distribution
 dc machines are comparatively low rating machines.

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Electrical Machines
In a stepper motor the detente torque means

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

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