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A synchronous machine with its field winding on rotor and polyphase armature winding on stator. At steady state running condition, its air gap field is?

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A synchronous machine with its field winding on rotor and polyphase armature winding on stator. At steady state running condition, its air gap field is?

(a) stationary w.r.t. stator

(b) rotating at double the Ns w.r.t. rotor

(c) rotating at -Ns w.r.t. rotor

(d) stationary w.r.t. rotor.

The question was asked in my homework.

This intriguing question comes from Synchronous Machine Applications in portion Synchronous Machines of Electrical Machines

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Right option is (d) stationary w.r.t. rotor.

The best explanation: As the field is on rotor itself, the sir gap will be stationary w.r.t. rotor.

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