Electrical Machines
An ideal synchronous motor has no starting torque because

 rotor winding is highly reactive.
  relative velocity between stator and rotor mmf’s is not zero.
 relative velocity between the stator and rotor mmf’s is zero.
 rotor is made up of salient poles.

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Electrical Machines
In a stepper motor the detente torque means

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

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