Q2:A 208V, Y-connected synchronous motor is drawing 40A at unity power factor from a 208V powersystem. The field current flowing under these conditions is 2.7A. Its synchronous reactance is 0.82 and itsarmature resistance is 0.2 2. Assume a linear open-circuit characteristic.1- Find EA and the torque angle.2- How much field current would be required to make the motor operate at 0.8 PF lagging.3- How much field current would be required to make the motor operate at 0.8 PF leading.4- How much field current would be required to make the motor operate at unity PF.

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Answered: Q2: A 208V, Y-connected synchronous…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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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
QUESTION 2 a) Draw the equivalent circuit and torque-speed characteristic curve for a series DC motor. b) Briefly explain the induced torque occurs in a series DC motor. e) A 20-hp 240-V 76-A 900 rimin series motor has a field winding of 33 turns per pole. Its armature resistance is 0.09 2, and its field resistance is 0.06 2. The magnetization curve expressed in terms of magnetomotive force versus Ex at 900 rimin is given by the following table: Table Q2 c): The magnetomotive force table for a de motor taken at 900r'min E. V 95 150 188 212 229 243 F.A tuus 1000 1500 2000 2500 500 3000 If the motor running at 33 percent of the full-koad armature current, determine: ) The motor's power converted from electrical to mechanical form, Prene i) The motor's torque, Tnit ii) The motor's speed, n
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(b) A 2 pole 220 V, 100A, and 850 rpm separately excited DC motor has an armature resistance of 0.15 0. Two field coils are connected in parallel and used to drive a load with the torque of TL = 400 – 0.2N, Nm Where N is the motor speed in rpm. Armature voltage control and two field windings connected in series are used in speed control below and above the rated, respectively. (i) Calculate the motor armature current and speed when the armature voltage is reduced to 110VV. (ii) Examine the motor speed and current when field coils are connected in series.
A 220 V dc shunt motor develops a total torque of 100 N-M and takes 29A at 600 rpm. The armature and shunt field resistance are 0.3 ohm and 220 ohms respectively. If the speed is to be increased to 800 rpm determine the percentage reduction of the field and additional resistance to be inserted in the field circuit. The torque develop at 800 rpm is 70 N-M.
On full load a 500-volt series motor takes 100-Amp and runs at 840 rpm. The armature resistance of 0.1-ohm, field resistance 0.04-ohm. Find the speed when developing haft full load toque but with a 0.08-ohm diverter resistance parallel with the series field winding. Assume flux proportion to the field current.
4. A 120-V shunt DC motor has armature resistance R=0.22 and and field resistance Rp=602 . The rated full load current is 42 A. Calculate the following: ( Calculate the following 1. ting current if the motor is dira the current as a p 2. The valuee external resistaa he connected in series with armature circuit to t starting current to 150% of the full loauent. Pacross the 120V supply. Express of the full load value. (B) Design a starting circuit for the DC motor that will limit maximum starting current to 150% of rated armature current. 1. Find number of stage in the starting cicuit 2. Find Ea at the end of each stage 3. Find the resistance of each stage
pole. 50-Hz. 3-ϕ induction motor has a full-load speed of 950 rpm. At half load its speed would be ..... rpm a) 475 b) 500 c) 975 d)1000
A three-phase, 460-V, 60-Hz, four-pole Y-connected induction motor has the following equivalent circuit parameters: R, = 0.42 Q, R', = 0.23 0, Xs = X, = 0.82 0, and Xm = 22 0. The rotor speed is 1750 rpm. a. Use the approximate equivalent circuit in Figure Q2 to construct an appropriate forward motoring torque – angular speed characteristic graph for the induction motor. The graph must at least have the following points: i. Torque at synchronous speed and its corresponding slip. ii. Torque at stationary and its corresponding slip. i. Maximum torque and its corresponding slip. iv. Torque at 1750 rpm and its corresponding slip.
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An 8-pole, 50 Hz induction motor has a full load slip of 2.5 percent and amaximum torque of twice the full-load torque. At what value of slip does themaximum torque occur?
A 7.5-hp 120-V series de motor has an armature resistance of 0.2 2 and a series field resistance of 0.16 2. At full load, the current input is 58 A, and the rated speed is 1050 r/min. Its magnetization curve is shown in Figure. The core losses are 200 W, and the mechanical losses are 240 W at full load. Assume that the mechanical losses vary as the cube of the speed of the motor and that the core losses are constant. Internal generated voltage EA, V 160 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 0 10 20 Speed 1200 r/min 30 40 Series field current, A 50 60 70 (a) What is the efficiency of the motor at full load? (b) What are the speed and efficiency of the motor if it is operating at an armature current of 35 A?

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