4. What advantage you can obtain from an over excited synchronous motor at no load?
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Synchronous Generator
In comparison to an asynchronous generator, it is a machine where the rotor speed is equal to the rotating magnetic field produced by the stator, i.e., mechanical speed is equal to the electrical speed, thus called synchronous, and not asynchronous.
Salient Pole Rotor
Salient pole rotor includes a large number of exposed poles mounted on a magnetic wheel. The construction of a bright pole is as shown in the image on the left. The proposed poles are made of metal laminations. The rotor winding is provided on these poles and is supported by pole shoes.
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- Describe the basic circuit of DC Generators including its yoke, fid windings, interpoles, fieldpoles, difference of shunt coils and series coils, commutator and brushes ?1) P.f of inductive load is corrected by connecting . . across it. .... ...... 2) Open circuit test measures . losses. 3) The output variables of a motor are and ........ ... .... 4) For a motor output power is given by ...... 5) Flux control, voltage control, and armature control are three methods for ....... of dc motor. 6) A transformer takes 100V at primary and gives 50V at secondary, its turn ratio equals 7) The given set of equations represents . . Ea – laRa = Vr , la = IL , %3D Rf 8) The given set of equations represents. la = !, + IL, VT Rf Ea – laRa = Vr , 9) The given set of equations represents . Ea – laRa – IseRse = Vr, la = Ise = l, %3D | 10). .. has more initial torque than shunt dc motor.L-1). The 3-phase wound-rotor induction motor has .... . a) high starting torque b) low starting current c) both "a" and "b" d) neither "a" nor "b" L-2). The 3-phase wound-rotor induction.........a) motor has a wire wound rotor b) motor's rotor can be connected to an external resistive load by way of slip rings and brushes c) motor requires more maintenance than the 3-phase squirrel-cage induction motor d) all of the above L-3). The 3-phase wound-rotor induction motor's rotor circuit's resistance should be adjusted so it is__________ during starting. a) low b) high c) either "a" or "b" d) neither "a" nor "b" L-4). Will a 3-phase wound-rotor induction motor start with no external circuit connected to its rotor leads? a) yes b) no
- Q4/B/ What are the principal characteristics of a series DC motor? What are its uses? Core McP5.10 A speed control system of an armature-controlled DC motor uses the back emf voltage of the motor as a feedback signal. (a) Draw the block diagram of this system (see Equation 2.66). (b) Calculate the steady- state error of this system to a step input command set- ting the speed to a new level. Assume that R, = L. = J = b = 1, the motor constant is Km = 1, and K, = 1. (c) Select a feedback gain for the back emf signal to yield a step response with an overshoot of 15%. %3!12. The IR-compensation in frequency control of induction motors is used for: a) compensation of the voltage drop in the active resistance of the stator winding. b) compensation of the voltage drop in the inductive reactance of the stator winding. c) keeping the motor voltage constant. d) keeping the motor speed constant U₁ U₁ Us0 0 f. f₁
- Design and develop equivalent circuit model of a single phase Induction motor with th consideration of core losses present with the parameter consideration of stator resistance R1 and reactance X1 and two rotor parameters which includes r2,x2 and magnetising reactance xm. (Illustration is required) Draw by hand pleaseA hybrid stepper motor is shown in Figure Q2(b). Demonstrate how the windings of the stepper motor are excited in wave drive mode to rotate the rotor 4 steps in the counterclockwise direction. Assume that Figure Q2(b) shows the starting position (to) of the stepper motor before the windings are excited. The first step (41) is given in Table Q2(b). (Note: Transfer Table Q2(b) to the answer script; tick the correct cells in the table to show the winding excitation sequence.) (b) Table Q2(b) Clock cycle Stator pole North pole South pole i (s) t2 (s) Al A2 B1 B2 Al A2 B1 B2 Clock eyele в (s) A2 14 (s) Stator pole North pole South pole AI B1 B2 Al A2 B1 B2 stator A1 AL armature N shaft PM armature 1- amature 2 armature 2 A A2 Figure Q2(b)4. A shunt generator has a full load current of 196 A at 220 V. The stray losses are 900W and the shunt field coil resistance is 75N. If it has a full load efficiency of 90%, find the armature resistance.
- Two generators operating in parallel supply a total load current of 150 A.The terminal potential difference of one machine falls from 250 V on no-load to 234 V when its current output is 100 A. The terminal potentialdifference of the other machine falls from 250 V on no-load to 230 V when its armature current is 80 A. The external characteristics are rectilinear. Determine :(i) The current supplied by each machine; and (ii) Terminal voltage. A: 91.46 A, 58.54 A, 235.37 VTwo identical 3-phase, 500-V induction machines are mechanically coupled for a back-to-back test. One machine is motoring from a 500-V, 50-Hz supply and the other is generating on to a 3-phase, 500-V synchronous machine for which the fre- quency can be controlled. It is required to run the motoring induction mạchine at 40 hp. Neglecting the slight change in the generating machine parameters due to oper- ating at a reduced frequency, estimate the rating of the synchronous machine for this duty and the frequency at which it must be run. Line input readings for each machine No load 500 V 8.5 A 1-6 kW Locked rotor 100 V 30 A 1-6 kW Friction and windage loss per machine 0-8 kW. R = R2'A shunt generator has a full load current of 195 A at 250 V.The stray losses are 720 W and the shunt field coil resistance is 50 0.lt has a full load efficiency of 90 % Find the armature resistance.Also find the current corresponding to maximum efficiency.