![Electric Motor Control](https://www.bartleby.com/isbn_cover_images/9781305177611/9781305177611_largeCoverImage.jpg)
Electric Motor Control
10th Edition
ISBN: 9781305177611
Author: Herman
Publisher: Cengage
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 44, Problem 4SQ
To determine
Find the series resistance required to limit the current to 30 A across a
Expert Solution & Answer
![Check Mark](/static/check-mark.png)
Want to see the full answer?
Check out a sample textbook solution![Blurred answer](/static/blurred-answer.jpg)
Students have asked these similar questions
Complete the wiring diagrams as per Worksheets 5-A and 5-B then solve for "A" through "G" for the DC motor on Worksheets 5-A and 5-B when it is running at capacity and its specifications are as follows:Rated input = 125 volts, 16 ampsArmature Resistance = 0.3 ohms(Ω)Shunt Field Resistance = 50 ohms (Ω)Series Field Resistance = 0.6 ohm (Ω)Rheostat Resistance = 12.5 ohm (Ω)A) Shunt field current (I-shunt)a) 2.5 A b) 13.5A c) 16 A d) 18.5 AB) Armature current (I-arm)a) 2.5 A b) 13.5A c) 16 A d) 18.5 AC) Voltage drop of shunt field (I-shunt)a) 4.05 V b) 120.95 V c) 125 V d) 129.5 VD) Voltage drop of armature (IR-arm)
A 150 HP, 3-phase, 6 pole, 460 V, 60 Hz induction motor draws 195 A line current at full load speed of 1170 rpm and 0.85 pf. Solve for the percent slip at full load.
(a). 2.5% (b). 3.0%
(c). 2.8% (d). 2.0%
Complete the wiring diagrams as per Worksheets 7-A and 7-B then solve for "A" through "K" for the DC motor on Worksheets 7-A and 7-B when it is running at capacity and its specifications are as follows:Rated input = 125 volts, 16 ampsArmature Resistance = 0.3 ohms(Ω)Shunt Field Resistance = 50 ohms (Ω)Series Field Resistance 0.6 ohms (Ω)Rheostat Resistance = 12.5 ohms (Ω)A)power consumed by series field(P-series)a)56.58W b)153.6W c)265.42W d)1523.WB)power consumed by shunt field(P-shunt)a)56.58W b)153.6W c)265.42W d)1523.56WC)power consumed by armature resistance(P-arm)a)56.58W b)153.6W c)265.42W d)1523.56WD)percent efficiency of the machine( % eff) if rotational loses are 850 Wa)30% b)64% c)86% d)99%
Chapter 44 Solutions
Electric Motor Control
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- Explain how does the current will be reduced during the starting of the motor.arrow_forward4-What is the main function of a diverter used in series wound DC motor? 5- What is the main difference between (iron and friction losses) and copper (Cu) losses in DC generators? 05arrow_forward14/ 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 onlyarrow_forward
- Complete the wiring diagrams as per Worksheets 6-A and 6-B then solve for "A" through "K" for the DC motor on Worksheets 6-A and 6-B when it is running at capacity and its specifications are as follows: Rated input = 125 volts, 16 ampsArmature Resistance = 0.3 ohms(Ω)Shunt Field Resistance = 50 ohms (Ω)Series Field Resistance 0.6 ohms (Ω)Rheostat Resistance = 12.5 ohms (Ω) A) Series field current (I-series) a) 2.3 A b) 13.69 A c) 16 A d) 18.3 A B) Shunt field current (I-shunt) a) 2.3 A b) 13.69 A c) 16 A d) 18.3 A C) Armature current (I-arm) a) 2.3 A b) 13.69 A c) 16 A d) 18.3 Aarrow_forwardA 220 V shunt motor driving its normal load draws an armature current of 50 A from a 220 V dc source. The armature resistance of this motor including brushes is 0.25 ohms. How much armature current (minimum) Will this motor draw from a 200 V DC source when driving the same load with the field adjusted to maintain the same speed.arrow_forwardA 400V, 60HZ, 6-pole wye connected , 30 induction motor draws 75KW with a line current of 100A. The core loss is 2KW, Friction and Windage loss is 1.2KW. The stator resistance between two terminals is 0.352. What is the efficiency if the motor runs at a slip of 2.5%?arrow_forward
- In Figure 327, the motor cannot be started in high speed. Why?arrow_forwardA 120 volts shunt motor has an armature resistance of 0.08 ohm and filed resistance of 60 ohms. What current is drawn when its back emf is 114.8 volts?arrow_forwardWhat is The Xm for the single-phase induction motor (R1d.c=2 ohm) isIf the no-load test ( Vo=220V, Io=7.2, Po=315watt ) Blocked rotor test (Vs=70V, Is=9.5A, Ps=350watt?arrow_forward
- a three phase star connected six pole induction motor has the following parameters R1=0.294 ohm,R2=0.144ohm,X1=0.503ohm,X2=0.209ohm Xm=13.25ohm a slip of the motor is 2%. the stator input impedence of the motor is?arrow_forwardType your question here The rotor of a 4 pole, 50 Hz, slip ring induction motor has a resistance of 0.25 ohm per phase and runs at 1440 rpm at full-load. Calculate the extemal resistance per phase, which must be added to lower the speed to 1200 rpm, torque remaining the same?arrow_forward(B)- Indicate whether the following statements are true or false and correct the false statements 1- Wave wound armature has two parallel paths. 2- The current ratio is equal to 1/ turn ratio at no-load while the voltage ratio is equal to 1/ turn ratio at full load 5.4. 3-When a series de motor is operated without a load, the armature draws excessive current Ph 4- The hysteresis loss can be minimized by using core of thin laminations ل لهول 259 Ne 02arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Delmar's Standard Textbook Of ElectricityElectrical EngineeringISBN:9781337900348Author:Stephen L. HermanPublisher:Cengage LearningElectricity for Refrigeration, Heating, and Air C...Mechanical EngineeringISBN:9781337399128Author:Russell E. SmithPublisher:Cengage Learning
![Text book image](https://www.bartleby.com/isbn_cover_images/9781133702818/9781133702818_smallCoverImage.gif)
![Text book image](https://www.bartleby.com/isbn_cover_images/9781337900348/9781337900348_smallCoverImage.jpg)
Delmar's Standard Textbook Of Electricity
Electrical Engineering
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Cengage Learning
![Text book image](https://www.bartleby.com/isbn_cover_images/9781337399128/9781337399128_smallCoverImage.gif)
Electricity for Refrigeration, Heating, and Air C...
Mechanical Engineering
ISBN:9781337399128
Author:Russell E. Smith
Publisher:Cengage Learning