1. The flux-density distribution in the airgap of a 60-Hz, 4-pole, salient-pole machine is sinusoidal, having an amplitu

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1 The Flux Density Distribution In The Airgap Of A 60 Hz 4 Pole Salient Pole Machine Is Sinusoidal Having An Amplitu 1 (108.49 KiB) Viewed 76 times

1. The flux-density distribution in the airgap of a 60-Hz, 4-pole, salient-pole machine is sinusoidal, having an amplitude of 0.6 T. Calculate the instantaneous and ims values o the voltage induced in a 150-tum coil on the armature, if the axial length of the armature and its inner diameter are both 100 mm. 2. A 4-pole, 3-phase synchronous machine has 48 slots. Calculate the armature-winding distribution factor 3. A 3-phase, 8-pole, 60-Hz, wye-connected, salient-pole synchronous generator has 9 slots, with 4 conductors per slot connected in series in each phase. The coil pitch is 10 slots. If the maximum value of the airgap flux is 60 mWb and the flux-density distribution in the airgap is sinusoidal, determine (a) the rms phase voltage and (b) the rms line voltage, (c) If each phase is capable of carrying 650 A in current, what is the kVA rating of the machine? 4. A 3-phase, wye-connected, round-rotor synchronous generator rated at 10 KVA 230V has a synchronous reactance of 1.2 Q per phase and an armature resistance of 0.5 d per phase. Calculate the percent voltage regulation at full-load with 0.8 lagging powe factor 5. Repeat Problem 6.9 for the case of 0.8 leading power factor, other data remaining unchanged. 6. For the generator of Problem 6.9, determine the power factor such that the voltage regulation is zero on full-load. 7. A 20-KVA, 220-V, wye-connected, 3-phase, salient-pole synchronous generator supplies rated load at 0.707 lagging power factor. The reactances per phase are Xd = 2Xq = 40 Neglecting the armature resistance, determine (a) the power angle and (b) the percent voltage regulation 180 a) Determine the power developed by the generator of Problem 6.13 and verify that it is equal to the power supplied to the load, (b) How much power is developed due to saliency? 19. A 3-phase, salient-pole, 440-V, Wye-connected synchronous generator operates at a power angle of 20 while developing a power of 36 kW. The machine constants per phase are Xd = 25. Xq=5 Q: Ra is negligible. Calculate the voltage regulation for the given operating conditions. 10. A 2300-V, 3-phase, wye-connected, round-rotor synchronous motor has a synchronous reactance of 3 Q per phase and an armature resistance of 0.250 per phase. The motor operates on load such that the power angle is -15°, and the excitation is so adjusted that the internally induced voltage is equal in magnitude to the terminal voltage Determine (a) the armature current and (b) the power factor of the motor