Answer all questions from this section. Use a fresh page for each question.Question B1 [15 pts]An universal motor is very similar to a DC series motor in construction, but it ismodified slightly to allow the motor to operate properly on AC power. A washingmachine is driven by an universal motor, which is powered by single-phase AC sourcehaving 110 Vac and 60 Hz. The armature winding of the motor has the resistance andinductance of 0.4 Q2 and 3 mH, respectively. The field winding of the motor has theresistance and inductance of 0.8 02 and 6 mH, respectively. When the washing machineoperates at half load torque, the motor draws 10 Aac and runs at 1000 rpm. Calculatethe input current and speed of the motor when the washing machine operates at full loadtorque.At half load torque,(i) Calculate impedance of the armature and field windings.[3 pts](ii) Calculate the average electromotive force (emf) and average currentin the armature.[4 pts]At full load torque.(iii) Determine the average and root mean square armature current.[4 pts](iv) Determine the average emf in the armature.[2 pts](v) Determine the speed of the motor.[2 pts]

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Answered: Answer all questions from this section.…

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter51: Electric And Electronic Braking

Section: Chapter Questions

Problem 2SQ: Differentiate between the AC and DC magnetic fields applied to an induction motor stator.

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Similar questions

14/ What are the following statements are true for a three-phase induction motor? I. Three-phase induction motor stator winding is fed from a three-phase supply II. Stator carries a three-phase winding III. Rotor carries a short circuited winding a. I and II only b. I,II and III c. II and III d. I only
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 turn
What are the following statements are true for a three-phase induction motor? I. Three-phase induction motor stator winding is fed from a single-phase supply II. Stator carries a three-phase winding III. Rotor carries a short circuited winding a. I,II and III b. I only c. I and II only d. II and III
A triplex wave-wound armature is used in a 6-pole DC machine. The number of coils is 111 each of which contains 12 turns. The resistance of each turn is 0.0112. Its flux per pole is 0.038 Wb, and its rotational speed is 230 rpm Calculate the number of conductors in the machine Calculate the the number of current paths in the machine Calculate the constant K'
discuss how the dc motor is used in washing machine
A series motor has an armature resistance of 0.2 ohms and a series field resistance of 0.3 ohms. It is connected to a 240V supply at a particular load runs at 24 rev/s when drawing a 15A from the supply. Calculate the speed of the motor when the load is changed such that the current is increased to 30A. Answer is in rev/sec.
A series motor runs at 800rpm when the voltage is 400v and the current is 25 ampere the armature resistance is 0.4ohm and the series field resistance is 0.2ohm determine the resistance to be connected in series to reduce the speed to 600rpm with same current
7- Iron loss in the rotor of a 3-phase induction motor is negligible due to (a) Very low frequency of emf induced in the rotor (c) Very low flux density in rotor parts 8- The starting current of a 3-phase induction motor is about (a) Half (c) 5 to 7 times (b) Twice (d) 8 to 10 times 9- During plugging of an induction motor (a) Phase sequence is reversed (b) A de source is connected to stator (e) One phase is open circaited (d) Power is ied back to mains 10- Direct online (D.O.L.) starter is used for induction motors (a)Less than 5 h.p. (b) Less than 10 h.p. (c) Greater than 10 h.p. (d) For any capacity (b) Very low emf induced in the rotor (d) Constant magnitude of flux linking the rotor core of its full load rated current
A four-pole induction motor drives a load at 2478 rpm. This is to be accomplished by using an electronic converter to convert a 400-V dc source into a set of three-phase ac voltages. Part A Find the frequency required for the ac voltages assuming that the slip is 4 percent. The load requires 2 hp. Express your answer to three significant figures and include the appropriate units. f= Submit Part B Value I = HA Request Answer Submit If the dc-to-ac converter has a power efficiency of 90 percent and the motor has a power efficiency of 80 percent, estimate the current taken from the dc source. Express your answer to three significant figures and include the appropriate units. HÅ Value Units Request Answer ? Units ?
Differentiate between the AC and DC magnetic fields applied to an induction motor stator.
Name three factors that determine the torque produced by an induction motor.
A 110 V, 60 Hz, 6 – pole single phase induction motor 1/3 hp has the following equivalent circuit impedances: RI = 1.52 ohm, R2 = 3.13 ohm and x1 =2.10 ohm, x2 =1.56 ohm. Xm=58.2 ohm, The Friction, windage and stry losses =16W, the core loss = 35 W, For a slip of 0.05, calculation (a) input current, (b) power factor, (c) developed power, (d) output power, (e) speed (f) in put power (g) air gab power (h) T ind (i) T load 6) efficiency.

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