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categoryهندسة كهربائية schoolبكالوريوس event_available2026-07-14

السؤال

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I. Shown below is the layout of a synchronous machine with stator containing three phase wiring. Also given below is the computed value of the magnetic fields generated by the application of three phase stator currents. If the magnitude of the magnetic fields generated is Bm 10 T, and the speed of rotation of the combined magnetic field is co= 10 radians/second, determine the following = a) The Baet of the combination of the three fields at the value of t 1 second b) Bnet at t=5 seconds c) Is the field rotation clockwise or counter clockwise. Explain d) Show how rearranging the three fields can reverse the direction of rotation e) Show positions of the results of (Bnet) for parts a and b on the following diagram B (f) B (1) By sin cot/0° T By sin(wt-120°)4120° T B(t) By sin(or - 240°)/240° = T O

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