The paper presents the experimental results of power flow measurements in the air gap of a salient-pole synchronous machine at no-load in the rotor reference frame. The essence of this new method is the measurement of an alternative Poynting vector from the electric and magnetic fields in the air gap of the machine. Suitable probes for measuring these field components are briefly described, together with the associated circuits.
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W.Z. Fam (1971) studied this question.
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