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In the equation for RMS value of the generated EMF in a full pitched coil of an AC machine, E = Emax/√2 = √2πfrNΦ, fr depends on ____________

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In the equation for RMS value of the generated EMF in a full pitched coil of an AC machine, E = Emax/√2 = √2πfrNΦ, fr depends on ____________

(a) rotating speed of the armature coil

(b) rotating speed of the flux density wave

(c) relative velocity between the flux density wave and armature coil

(d) all of the mentioned

This question was addressed to me in my homework.

This interesting question is from Generated EMF topic in portion Principles of Electro mechanical Energy Conversions of Electrical Machines

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Right option is (c) relative velocity between the flux density wave and armature coil

Best explanation: fr is called the rotational or speed frequency, since its value depends upon the relative velocity between the flux density wave and the armature coil.

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