The 2-phase drag-cup machine is treated as a linear 4-terminal element. The self-impedance of each phase and the mutual impedance between phases are found by obtaining the electromagnetic field components in the air gap between stator and rotor. These components are derived from a single vector field function, the magnetic vector potential. The impedances are functions of the geometrical dimensions, frequency, and the relative slip.
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Daniel Gonen (1966) studied this question.
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