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A wound-rotor induction machine, driven by a dc motor whose speed can be controlled, is operated as a frequency changer. The three-phase stator winding of the induction machine is excited from a 60-Hz supply, while the variable - frequency three-phase power is taken out of the slip rings. The output frequency range is to be 120 to 420 Hz; the maximum speed is not to exceed 3000 r/min; and the maximum power output at 420 Hz is to be 70 kW at 0.8 power factor.Assuming that themaximum-speed condition determines the machine size, and neglecting exciting current, losses, and voltage drops in the induction machine, calculate:
(a) The minimum number of poles for the induction machine.
(b) The corresponding minimum and maximum speeds.
(c) The kVA rating of the induction-machine stator winding.
(d) The horsepower rating of the dc machine.
Sign flag Since D 7 bit in the results is 0sign flag is reset. This also shown that the results is positive.
which ckt. Or components using for irregular ac sine wave change into pure sine wave.......
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