Incident flow and aerodynamic forces on a segment of a rotor blade [10]. This signal - on reversing drives after rectification - is compared 7. The active power mean of the instantaneous power at the line side is - assuming sinusoidal line voltage - determined by the fundamental component iAl 7' of the line current 8. The equations 6. Since electron tubes with heated cathodes could not supply enough current to drive motors and were plagued with high voltage drop resulting in poor efficiency, they were superseded by gas-filled tubes 8.
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