b. The rms voltage of a synchronous motor is given by E = 4.44k fT_¸Volts ph where k, f, Tph and g are winding factor, frequency, no of turns per phase, and flux per pole per phase, respectively. Analyze and synthesis the equation for obtaining the best performance of the motor.
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- Which of the following phase sequence of harmonics causes torque pulsing (parasitic torque), vibration and reduces the life of an induction motor?"Negative & PositiveNegativePositiveZeroProblem: A short-shunt compound generator has armature, shunt field and series field resistances of 0.5 Ω, 156 Ω, and 0.465 Ω respectively. If it supplies a load of 9 kW at a terminal voltage of 241 V, calculate the generated emf in volt. *Four decimal places380 V, 50 Hz, 2p = 6, star connected induction motor impedance in ohms per phase values:R1 = 0.3, X1 = j0.45, R2 = 0.15, X2 = j0.45, Xm = j15Its total mechanical losses are 500W. Core losses are negligible. For a rotor slip of 0.01 at rated voltage, calculate the following:a. Input currentb. power factorc. rotor frequencyd. synchronous speede. rotor speedf. Input active powerg. Stator copper lossesh. air gap poweri. Transferred power and Output powerj. shaft momentk. efficiency
- A three-phase alternator, 20 kV, synchronous has a reactance of 10Ω and a negligible resistance. The machine draws an armature current of 150A, 0.80 pf lagging. If the steam admission is constant and field current isadjusted raising the induced emf by 25 %, find the new armature current.QI: The parameters of a 4 kW, 220V. 2-phase induction motor, in ohms per phase, are: r1=0.53, x1 =2.4, XM= 70, r2 = 0.96, x2 = 3.0. The motor is operated from unbalanced 2- phase source whose voltages are 230V and 210V, the smaller voltage is lagging the larger by 800. For a slip of 5% and rotational losses of 30 W, find the positive- and negative- sequence components of: (a) the applied voltages. (b) Find the values of phase currents (c) the input current. (d) Find the developed mechanical power. (e) Find the efficiency.In a slip power recovery system, 22 V/phase are injected into the rotor circuit of a fourpole,50 Hz, 380 V, star-connected slip-ring induction motor, reducing its speed to900 r/min. The stator impedance is (1,2 + j3,8) Ω/phase and the rotor impedance atstandstill is (0,4 + j0,8) Ω/phase. The admittance of the shunt magnetising circuit is0,3∟– 70° S per phase and the effective turns ratio is 2. Use the approximate equivalentcircuit and calculate the rotor referred current and power factor and the electromagnetic torque in Nm
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