Part (A):A 120 V DC shunt motor has an armature resistance of 0.4 0 and a brush voltdrop of 2 V.The rated full-load armature current is 85 A.Determine:1. The current at the instant of starting2. The percent of full load at the instant of startingPart (B):Calculate the various values (taps) of starting resistance to limit the current in themotor of Part (A) to:Case (i):•160% of rated load at the instant of startingCase (ii):•160% of rated load, when the counter emf is 30% of the armature voltageCase (iii):160% of rated load, when the counter emf is 60% of the armature voltagePart (C):Find the counter emf at full load, without starting resistance.

Answered: Image /qna-images/answer/35294744-bf0c-4084-bcf2-65eb29c352cc.jpg

Answered: Part (A): A 120 V DC shunt motor has an…

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...

See similar textbooks

Similar questions

A 5HP 230V 1500 rpm shunt motor has an armature resistance including brushes of 0.175 ohm, the shunt field resistance is 610 ohms and the stray losses equal to 305W. The input at rated load is nearest to: a. 4250 W b. 4050 W c. 4350 W d. 4150 W
Design a DC motor circuit to drive A fan-type load with a torque equation equal to: TL=1.34×10−7ω2TL=1.34×10−7ω2 N.m The fan speed range is from 500 to 1200 rpm. To achieve the required operation, the armature voltage of the motor is adjusted by a single-phase, full-wave, ac/dc converter. The input voltage and frequency to the converter are 480 V (rms) and 50 Hz. choose the motor type, show the motor rating, αα range, Supply voltage, and frequency, and any required other information Modify the design to automatically adjust the voltage drive the load within the specified speed range. show the control variable, controller type, connection, and controller weights.
Design a DC motor circuit to drive A fan-type load with a torque equation equal to: TL=1.34×10−7ω2TL=1.34×10−7ω2 N.m The fan speed range is from 500 to 1200 rpm. To achieve the required operation, the armature voltage of the motor is adjusted by a single-phase, full-wave, ac/dc converter. The input voltage and frequency to the converter are 480 V (rms) and 50 Hz. choose the motor type, show the motor rating, αα range, Supply voltage, and frequency, and any required other information Modify the design to automatically adjust the voltage drive the load within the specified speed range. show the control variable, controller type, connection, and controller weights. design the single-phase, full-wave, ac/ dc converter. show design specifications, the reason for DC motor selection. correct manual circuit, and correct automatic closed-loop control circuit
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
A 120-V shunt DC motor has armature resistance RA=0.2Ω and and field resistance RF=60Ω . The rated full load current is 42 A. Calculate the following: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 cicuit2. Find EA at the end of each stage3. Find the resistance of each stage
A 48kW, 600V, 1500 rpm separately excited dc motor is controlled by single phase semi-controlled converter. The resistance of the armature is 192 and of the field is 1450. The field circuit is controlled by a single phase fully controlled converter and its firing angle is set to 20. The AC supply voltage to the armature and field converters is a single phase 220V, 60 Hz. The voltage constant is 0.946 V/A rad/s. If the armature converter firing angle is 45 and the speed is 1200 rpm; calculate the armature current and the developed torque.
A 500-V, 37.3 kW, 1000 RPM DC shunt motor has on full-load an efficiency of 90 percent. The armature circuit resistance is 0.24 and there is total voltage drop of 2 V at the brushes. The field current is 1.8 A. Determine total resistance in motor starter to limit the starting armature current to 1.5 times the full-armature current.
A 250V dc short-shunt motor takes a current of 5A. The shunt, armature, and series field resistances are 100 ohms , 0.25 ohms, and 0.80 ohms respectively, what is the SPL?
Please
3. A 12 Hp 220V dc series motor has an armature and field resistance of 0.25 ohm and 0.2 ohm respectively. The full load efficiency is 84%. determine the the value of the starting resistance in order that the starting current will not exceed 120% of the full load armature current.
A 220 V, 50 Hz, 4-Pole, 1410 rpm, single phase induction motor has the following parameters: R₁ = 9.5 Q, X₁ = 12 Q, R₂ = 10.8 Q, X2 = 12 2, and XM = 260 Q. At rated speed the core loss is 30W, and the friction and windage loss is 15W. The motor is connected to a single phase 220V, 50 Hz and runs at the rated speed. Determine: the slip, motor current, power factor, input power, developed torque, output shaft power, shaft torque, efficiency, rotor frequencies, rotor copper losses, and the ratio of forward flux to the backward flux.
in the design of shunt connected DC motor, you intended to make field resistance high value to increase armature current la O decrease field current If O

SEE MORE QUESTIONS

Recommended textbooks for you

Introductory Circuit Analysis (13th Edition)

Electrical Engineering

ISBN:

9780133923605

Author:

Robert L. Boylestad

Publisher:

PEARSON

Delmar's Standard Textbook Of Electricity

Electrical Engineering

ISBN:

9781337900348

Author:

Stephen L. Herman

Publisher:

Cengage Learning

Programmable Logic Controllers

Electrical Engineering

ISBN:

9780073373843

Author:

Frank D. Petruzella

Publisher:

McGraw-Hill Education

Introductory Circuit Analysis (13th Edition)

Electrical Engineering

ISBN:

9780133923605

Author:

Robert L. Boylestad

Publisher:

PEARSON

Delmar's Standard Textbook Of Electricity

Electrical Engineering

ISBN:

9781337900348

Author:

Stephen L. Herman

Publisher:

Cengage Learning

Programmable Logic Controllers

Electrical Engineering

ISBN:

9780073373843

Author:

Frank D. Petruzella

Publisher:

McGraw-Hill Education

Fundamentals of Electric Circuits

Electrical Engineering

ISBN:

9780078028229

Author:

Charles K Alexander, Matthew Sadiku

Publisher:

McGraw-Hill Education

Electric Circuits. (11th Edition)

Electrical Engineering

ISBN:

9780134746968

Author:

James W. Nilsson, Susan Riedel

Publisher:

PEARSON

Engineering Electromagnetics

Electrical Engineering

ISBN:

9780078028151

Author:

Hayt, William H. (william Hart), Jr, BUCK, John A.

Publisher:

Mcgraw-hill Education,

SEE MORE TEXTBOOKS