In a 2-pole, three-phase ac machine, 4-1.5 mm, 1=24 cm, r=6cm, and N, -100. Under a balanced, sin...
Consider a three-phase, 2-pole induction machine. Neglect the stator winding resistance and the leakage inductance. The rated voltage is 217V (line-line, rms) at 60 Hz. Lm65mH, and the peak flux density in the air gap is 0.89T. Consider that the phase-a voltage reaches its positive peak at wt-0. Assuming that the rotor circuit is somehow open circuited, calculate the position(angle) of the magnetizing current space vector ims at wt-4g°.
Consider a 2-pole, 50 Hz, cylindrical rotor ac machine. The air-gap radius is 0.1 m, the air-gap distance is 0.002 m and the air-gap axial length is 0.3 m. The stator winding is excited by a 3-phase, 50 Hz, 5 A (peak), balanced ac current system without rotor excitation. Calculate the air-gap fundamental flux per-pole and the generated fundamental voltage between the terminals of the rotor winding when the rotor is stationary.
Problem 1 (25 points) The parameters of a 6-pole, 2-phase, permanent-magnet ac machine are: 10mH = 2Ω,4,-1 mH, Lm,- Calculate the angular rotor velocity wrm and the electrical angular velocity wr. (4 points) [Update: use part (i) for the operating condition.] (i) s given that the open-circuit phase voltage is sinusoidal with a peak-to-peak value of 40 V, when the device is driven at 1200 r/min. Calculate λ,n, (8 points) Alternatively-when the stator windings of the permanent-magnet ac machine are...
Q1 Consider a 24 slot machine. This machine is designed to have 4-poles a) If the phase winding 5/6 pitched, draw winding diagram of phase A. b) What is the mechanical angle between the poles of a phase? c) What is the electrical angle between the poles of a phase? d) Calculate the number of coils per phase. e) Each coil has 10 turns. What is the number of turns per phase? f) The phase A current is 5 A....
Problem 1: A four pole, 60Hz, 3-d synchronous generator has a rotor radius of 15 cm, a rotor length of 2.7m, and an air gap length of 2 mm. The rotor field winding consists of 1000 turns with a winding factor of 0.962. The Δ connected armature winding has 25 series turns per phase with a winding factor of 0.935. The generator is designed to achieve rated open-circuit voltage at a peak air-gap flux density of 1.25 T (a) At...
A 100 k VA, 1100 V, three-phase, 6-pole, Y-connected, 50 Hz synchronous machine has synchronousreactance of 6 92 per-phase and negligible armature resistance. Its core losses are 7 k W and itsfriction and windage losses are 8 kW. The speed droop is 2.5%.Initially the machine is operated alone as a generator and the field current is adjusted such that theno-load voltage equals the rated voltage.a) If the generator is supplying a line current of $2.5 A at 0.85 PF lagging....