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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- 1. The operation of Commutator in DC Motor is * O a) to convert dc to ac O b) to convert ac to dc O c) to convert fixed dc to variable dc O reverse the current direction in the rotating windings each half turnAn alternator is much less likely to burn out on a sustained short-circuit than a separately excited DC generator. Explain.6. Home Works: a) The figure below shows the per-phase equivalent circuit of a two- pole three-phase induction motor operating at 50 Hz. The voltage (E1) across the magnetizing inductance is 210 V, and the slip (s) is 0.05. What is the developed torque produced by the motor ? 0.04 0 jo.22 Q j0.22 0 j6.28 NE E1 0.05 0
- The terminal voltage of a 150 kW series generator is 600 V at rated load. The armature resistance is 0.06 ohms and the series field resistance is 0.04 ohms. Find generated emf.3. What are the various losses in an induction motor? On whatfactors do they depend?A four-pole, wave-wound generator has 220 coils of 10 turns each. The resistance of each turn is 0.02 2. Find the resistance of the armature winding.
- The synchronous speed of a 3-phase induc- tion motor having 20 poles and connected to a 50 Hz source is .......A 6 pole wave wound d.c. shunt generator has 500 conductors. A generator delivers 50 kW of power at 250 voltage at full load. The resistance of the field circuit is 125 2. Actual brush shift is 10°. Then find the demagnetizing and cross magnetizing ampere turns per pole and how many additional turns must be wound on each pole to eliminate the demagnetizing effect.An induction motor is an O stepper motor O asynchronous machine. O DC machine O synchronous machine example of
- 6. Home Works: a) The figure below shows the per-phase equivalent circuit of a two- pole three-phase induction motor operating at 50 Hz. The voltage (E1) across the magnetizing inductance is 210 V, and the slip (s) is 0.05. What is the developed torque produced by the motor ? 0.04 N jo.22 Q j0.22 0 0.05 0 j6.28 NE E1 VThe armature reaction occurs when a separately excited generator supplies rated load: Is always present Is always absent May be sometimes present None of the above6. The O.C.C. of a shunt generator when separately-excited and running at 1000 r.p.m. is given by : O.C.C. volt : 56 112 150 180 200 216 230 Field amp. : 0.5 1.0 1.5 2.0 2.5 3.0 3.5 If the generator is shunt-connected and runs at 1100 r.p.m. with a total field resistance of 80 2, determine (a) no-load e.m.f. (b) the output when the terminal voltage is 200 V if the armature resistance is 0.1 Q. (c) the terminal voltage of the generator when giving the maximum output current. Neglect the effect of armature reaction and of brush contact drop.