40% Part B: If the load Speed-Torque characteristics (including the mechanical losses) is described by following equation: TL- [11.1+(5/150) Nr]. as shown in Fig.1. Determine the speced control range(maximum range) for three of the following cases: a- Reducing the stator voltage using autotransformer. b- Inserting extemal rotor resistance. c- Reducing the input voltage by 35%. d- Reducing the input voltage so that Vnew-0.85 Vald. Speed Torque curve 200 Ta 100 100 100 Shaft speedN. pm Figure 1 ON anb

40% Part B: If the load Speed-Torque characteristics (including the mechanical losses) is described by following equation: TL- [11.1+(5/150) Nr]. as shown in Fig.1. Determine the speced control range(maximum range) for three of the following cases: a- Reducing the stator voltage using autotransformer. b- Inserting extemal rotor resistance. c- Reducing the input voltage by 35%. d- Reducing the input voltage so that Vnew-0.85 Vald. Speed Torque curve 200 Ta 100 100 100 Shaft speedN. pm Figure 1 ON anb

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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1. a) Write the most common expressions that give the stored energy and induced electromagnetic torque of two windings within the mutual coupling. b) Give the induced electromagnetic torque expression of a switched reluctance machine having the winding current i, and winding self-inductance L1. c) What is the positioning of the armature and excitation field spaces in a DC machine? What is the advantage of this positioning for the researcher?
(c) Electric machines can be classified into two categories, state both categories. (d) Describe THREE (3) methods to control the speed of the DC motor. (e) State why induction (asynchronous) machines are not suitable to be used as a generators, (f) An induction machine is the most rugged machine and is widely used in domestic and industry. State its application in single phase and three phase systems.
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In stepper motors, we can accomplish half-steps by: a. By turning coils ON one at a time. b. By turning two coils ON at a time. c. By turning all coils ON at a time. d. By applying PWM currents to a coil at a time.
Q16 A 240V, 50 Hz, single-phase capacitor start a.c. motor is loaded such that the slip is 6% the motor constants referred to the stator are : Stator resistance 2.20; rotor resistance 3.80 Stator reactance = 30 ; rotor reactance 2.10 Magnetizing reactance 860 ; iron and friction loss 500 Draw the equivalent circuit and from it find the output power and efficiency at the given loading. Ans[ 1090 W, 74.6%]
A 10 kW, 250V shunt motor has an armature resistance of 0.5ohm and a field resistance of 200ohm. At no load and rated voltage, the speed is 1200 rpm and the armature current is 3A. At full load and rated voltage, the current line is 47A and because of armature reaction, the flux is 4% less than it no load value. (a.) What is the full load speed? (b.)What is the developed torque at full load? 1158 rpm
Question A 3-phase, 415 V, 4-pole, 50 Hz induction motor draws 5 times the rated current at rated voltage at starting. It is required to bring down the starting current from the supply to 2 times of the rated current using a 3-phase autotransformer. If the magnetizing impedance of the induction motor and no-load current of the autotransformer is neglected, then the transformation ratio of the autotransformer is given by
7. The total rotational losses of an induction motor are a combination of ------- A) Friction losses B) Windage losses. D) Stray losses. C) Core losses. 8. The developed mechanical power can be calculated using the equation of- A) PAG - PRCL. B) PAG w sync C) (1-s) PAG. D) 3 E2Gc. 9. For an induction motor, if the synchronous speed is 1800 r/m, and the rotor speed 180rad/sec, then the slip will be: A) 5.5% C) 6% B) 4.5% D) 4% 10. The power losses in the stator part of the induction motor are B) Core losses D) Friction and windage losses A) Stator copper losses C) Air-gap losses
A 240V , Shunt DC - motor delivers power to a load at 1200 Rev / Min . The load Torque drawn by the motor is 320 N.m. The armature %3 resistance is 0.3 Ohm and the field resistance is 100 Ohm and the rotational losses are 500W. a. What are the armature current and the efficiency ? b. If the torque decreased to be 250 N.m find the speed !