Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 26, Problem 6SQ
To determine
Explain how the starter provides smooth acceleration and a gradual increase of torque.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Kindly please solve what is ask. I want a complete and handwritten solution so that I can understand. Thank you!
2
(B)- Indicate whether the following statements are true or false and correct the false statements
I-A d.c. shunt motor is running with certain load. The effect of adding an external
resistance in armature circuit is to increase the motor speed F Constant speed
2- A de series motor develops a torque of 30 N.m at 4 A of load current. if the current
is increased to 6 A, the torque developed will be 67.5 N.m T
3-If the two field Windings are wound in such a manner that the fluxes produced by the
two always help each other, the motor is called cumulatively compound F
4-The speed of d.c series motor is decreased if the armature current is increased T
5- To solve the Commutation Problem in large machines, this can be achieved by increasing
the brush width.
Tax
In (Rm. Ps)
i need the answer quickly
Chapter 26 Solutions
Electric Motor Control
Ch. 26 - What is the purpose of inserting resistance in the...Ch. 26 - Why is the power not interrupted when the motor...Ch. 26 - If the starter is to function properly and a...Ch. 26 - How may additional steps of acceleration be added?Ch. 26 - What is meant by the low or poor starting economy...Ch. 26 - Prob. 6SQ
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
- Q2 A DC shunt motor is connected to a 220 V supply. Figurel below shows the time/current characteristics with a resistance starter. If armature resistance is 0.12 0, a) What is the maximum current that is flowing in the armature at the instant of starting? b) What is the minimum current in the armature? c) How many sections does this starter resistance have? Show your work. d) Calculate the required starter resistance required to limit the current to the maximum value. 270 162 t2 tsarrow_forwardQ2 A DC shunt motor is connected to a 220 V supply. Figurel below shows the time/current characteristics with a resistance starter. If armature resistance is 0.12 0, a) What is the maximum current that is flowing in the armature at the instant of starting? b) What is the minimum current in the armature? c) How many sections does this starter resistance have? Show your work. d) Calculate the required starter resistance required to limit the current to the maximum value. 270 162 13 t.arrow_forwarda 220-v dc motor is running at a full load speed of 800 rpm and draws 100 A. calculate at what speed the motor will run when developing half torque. the total resistance of the armature and field is 0.1 ohmarrow_forward
- i need the answer quicklyarrow_forwardA 20-hp, 110 V DC shunt motor has an efficiency of 88% and the exciting current of 4 amperes and an armature resistance of 0.04 ohm. What starting resistance is required for full-load torque?arrow_forwardI have less to submit please help me in this problem.arrow_forward
- A 500 V shunt motor running at 720 rpm takes an armature current of 50 A. The equivalent armature resistance is 0.4 ohm. What resistance must be placed in series with the armature to reduce the speed to 540 rpm while maintaining the same torque?arrow_forwardPLEASE HELP ME TO SOLVE NUMBER 6 ONLYarrow_forwardAn induction motor develops rated torque with a slip of 3.5% when the rotor is cold. If the rotor resistance is 20% higher when the motor is at normal running temperature, at what slip it will develop rated torque?arrow_forward
- bläs 5 The input power to a 220 V lap wound shunt D.C motor runs is 11 kW , the speed is 1150 rpm takes 5 A at no load „shunt field resistance is 110 Q and armature resistance is 0.5Q Find a- The speed of motor at this load b-The speed if connected resistance (25 Q) in series with field resistance when the armature torque is constant and the flux is proportional to field current .assume the information in branch a is normal condition.c-Maximum efficiency before and after adding (R .add)arrow_forwardAt full load, when the DC shunt motor is supplied by 110 V dc source, the armature current is 20 A keeping the speed of the motor at 500 rpm. If the flux of the motor is weakened by 10%, the armature current drops to 15 A. By how much is the torque decreased?arrow_forward2. A 110 V shunt motor has a field resistance of 55 ohms and armature resistance of 0.1 ohm. The motor takes 20 A of current at 1000 rpm while developing full load torque. What is the motor speed when this motor develops 70% of the full load torque.arrow_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 Learning
Delmar's Standard Textbook Of Electricity
Electrical Engineering
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Cengage Learning