Q2: (A) An D.C motor with field control, has R, Lf field winding resistance andinductance respectively, Ef feild voltage, e back emf., J equivalent moment ofinertia of the motor and load referred to the motor shaft, f equivalent viscous frictioncoefficient of the motor and load referred the motor shaft, Tm torque delivered bythe motor,i. Drive the transfer functionthe field voltage.e(s)Tm(s), where is the angular position and Er isii.Draw the block diagram for this motor.(B): Obtain the transfer function of the electronic cct. shown in Fig.(2) belowZIC₁Z2C₂REs)wwwR₁E(s)R3wwFig. (2)Es)

Answered: Q2: (A) An D.C motor with field…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Q4) What is the effect in series motor if you assume V = Eb , with low resistance fielding winding ? a) b) The given information about series motor on full – load (with that the flux is proportional to the field current) is a ) takes ( 78A) and runs at (850 r.p.m) , the series winding resistance is (0.04 2) , with diverter in parallel with the field winding is a (0.18 2) and the armature resistance is (0.09 S2). ( 220 V Neglected the iron, friction and windage losses. Determine the efficiency , speed when developing full load torque ,the maximum efficiency .
4) A dc. ahunt machine while running as generator develops a voltage of 240 V at 1000 rpm. on no-load It has armature resistance of 0.5 12 and field resistance of 250 2. When the machine runs as motor, input to it at no-load ts 4 A at 240 V. Calculate the speed and efficiency of the machine when it runs as a motor taking 40 A at 240 V. Armature reaction weakens the field by 6%
A 230 V dc machine has an emf constantand . The field is separatelyexcited and produces 0.01 Wb per pole. for all parts ofthe problem. (a) At what speed does the machine operate as adc generator with rated terminal voltage? (b) At what speeddoes the machine operate as a dc motor with rated terminalvoltage? (c) If an external resistance is added in serieswith the armature circuit, at what speed does the machineoperate as a dc motor with rated terminal voltage? (d) If themotor of part (b) is known to be supplying 10 HP to a coupledmechanical load, determine the rotational losses at the point ofoperation ***Any two branches please do not be late
(7) The only parts suffers from eddy currents in AC motors: a- The stator. b- The rotor. c- The stator and rotor. (8) The unit of torque is a- W (rad. s') b- Js -1 C- Nm
In a three-phase switched reluctance motor having six stator poles and four rotor poles, the pole widths for the stator and rotor poles are the same, with φs = φr = 40°. The currents in the phase windings are applied when the inductances are increasing. Draw qualitively the current and torque wave- forms of each phase and the total torque developed by the motor for a square wave current having. (a) 40° width. (b) 30° width. (c) 20° width.
A 220 V DC series motor runs drawing a current of 30 A from the supply. Armature and field circuit resistances are 0.4 and 0.1 respectively. The load torque varies as the square of the speed. The flux in the motor may be taken as being proportional to the armature current. To reduce the speed of the motor by 50% the resistance in ohms that should be added in series with the armature is
Reducing the supply voltage so that Vnew = Vold / V3 reduces the maximum torque of the motor so that Tmaxnew= ...Tmaxold . * .... ...
A 500 V, lap wound d.c. A shunt motor has 90 slots and each has 8 conductors. When the motor delivers full load it draws a current of 30/ A from the line. The field and armature resistances are 250 ohm and 0.4 ohm respectively. If the fixed resistance is 27.1 mWh, find the speed of the motor and the torque produced.
• Q5/ in a DC motor. List and describe the types of losses that occur
نقطتان )2( Q1// An 8 pole duplex lap winding will have ............. parallel path 8 O 32 O 16 نقطتان )2( Q2//the armature of a dc * machine is made of silicon steel O cast steel O soft iron wrought iron O
23/. Explain the self excited DC Shunt generator with its voltage equation
A 250 V shunt motor, having an armature resistance of 0.2 ohm draws fromthe mains a current of 50 A on half full load. The speed is to beincreased to twice half full load speed. If the torque of the motor is ofconstant magnitude, determine the percentage change in flux required.[Ans. 52.29] I WANT A DIFFRENT APPROACH (NOT COPY PASTE ON LIBRARY)

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