Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 38, Problem 3SQ
To determine
Explain how the speed control is accomplished.
Expert Solution & Answer
Trending nowThis is a popular solution!
Students have asked these similar questions
1- Plot the speed-vokage relation.
2- The D.C. series moior must not
operation without load, why ?
3- Conparc between the two control
speed methods ( advantages and
disadvantages ).
4- Compare between the speed
control methods in D.C. series and
D.C. shunt metors.
5- Wihat are the practical
applications of the D.C. series
niotor?
6- Compare between D.C. series
and D.C. shunt motors.
7- Discuss your results.
Explain why control torque should be equal to deflection torque,happens if the control is more than deflation Torque.
Click to see additional instructions
What is the speed of a motor and power output under the following conditions?
stall torque = 200 oz-in (1.41 N-m)
no load speed = 4000 RPM
applied torque 80 oz-in (0.565 N-m)
speed =
RPM
power =
W
Note: it may be helpful to look at the equation T= T,-aw. You know some information about stall torque and no load speed, that you can use to find the speed at
another torque (T) value
Chapter 38 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
- Q4. Which of the following are reasons why brushes are made of carbon? (a) Carbon is a good conductor (b) Carbon will wear and confirm to the shape of the commutator (c) Carbon will form a low friction surface with the commutator (d) Carbon will wear before and prevent damage to the commutator (e) All of the above. Q5. Why is an external resistor required to bring a DC motor up to speed? (a) To increase the motor starting torque (b) To decrease the motor starting torque (c) To limit the motor starting current (d) To dynamically brake the motor (e) All of the above Q6. Why are the magnetic cores of rotating machines constructed from laminated steel? (a) To reduce copper losses (b) To reduce hysteresis loss (c) To reduce eddy current losses (d) To reduce eddy current and hysteresis losses (e) All of the above Which of the following generators best fits the description of a "constant current" generator? Q7. (a) DC series generator (b) DC separately-excited shunt generator (c) DC…arrow_forwardIn applications such as hoist, gates, movable bridges, street cars, locomotives, and transfer cars, very high starting torque is required and speed can vary with load changes. With the aid of diagrams, select the most appropriate motor for such applications?arrow_forwardDefine steady-state error and explain how to use different test signalsto evaluate the performance of a particular control systems.arrow_forward
- A 130 kW, 470 V separately excited de motor has the following rated values (nameplate): 1940 rpm (full load), 300 A (full load), 0.0935 N armature resistance. The motor efficiency is 90 %. Armature and field windings have separate power supplies. Assume the magnetic circuit is not saturated and neglect armature reaction. Ignore all mechanical losses in the calculation of torque.arrow_forwardPlease help with answering this question, please write clearly, thanks. Assuming no armature reaction, what is the speed of the motor at full load? What is the speed regulation of the motor?arrow_forwardElectric drive motors are usually running at high speed commonly at 1,800 rpm, 3,600 rpm or more. When you wish to use this electric motors to drive an equipment requiring a 40 rpm speed, which among the mechanical elements (gears, sprockets, pulleys) are ideal to use? Explainarrow_forward
- Question 9 The combined losses occuring in armature and field circuit of a DC motor is known as the rotational losses True O False Moving to another question will save this response. 梦 $ a hp Barrow_forward------ What is the difference between the servo motor and the stepper motor in construction, principle of works and applications ?arrow_forwardBriefly explain block diagram of electric drives.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
