Understanding Motor Controls
3rd Edition
ISBN: 9781305498129
Author: Stephen L. Herman
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 36, Problem 4RQ
What solid-state device is generally used to produce variable frequency in drives designed to control motors up to 500 HP?
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
A 7460 W split-phase motor running at 1750 rpm is used to drive a rotary pump. The pump should run continuously at approximately 1175 rpm. The center distance should not exceed 1118 mm. Space limits the diameter of the driven pulley to 292 mm.
Determine:
a. the pulley diameters,
b. the belt size, and
c. the number of belt required.
a 7460 w split-phase motor running at 1750 rpm is used to drive a rotary pump. the pump should run continuously at approximately 1175 rpm. the center distance should not exceed 1118 mm. space limits the diameter of the driven pulley to 292 mm. design a. the pulley diameters, b. the belt size, and c. the number of belt required.
A motor, operating clockwise is coupled through a belt drive to rotate an industrial exhaust fan at 500 rpm. The diameter of the motor sheave is 4 in. and the sheave on the fan is 14 in. Determine the belt speed.
Chapter 36 Solutions
Understanding Motor Controls
Ch. 36 - Prob. 1RQCh. 36 - Prob. 2RQCh. 36 - If an alternator is used to provide variable...Ch. 36 - What solid-state device is generally used to...Ch. 36 - Why are SCRs used to construct a bridge rectifier...Ch. 36 - What is the main disadvantage of using SCRs in a...Ch. 36 - How are junction transistors driven into...Ch. 36 - What is the disadvantage of driving a junction...Ch. 36 - Prob. 9RQCh. 36 - In variable frequency drives that employ IGBTs,...
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- Why are SCRs used to construct a bridge rectifier in many solid-state variable frequency drives?arrow_forwardA motor drives a load for which the torque required is given by Tload=80020+ωm Nm The torque–speed characteristic of the motor is shown in Figure P15.12. a. Will this system start from zero speed? Why or why not? b. Suppose that the system is brought up to speed by an auxiliary driver, which is then disengaged. In principle, at what two constant speeds can the system rotate? c. If the system is operating at the lower of the two speeds and power to the motor is briefly interrupted so the system slows by a few radians per second, what will happen after power is restored? Why? d. Repeat (c) if the system is initially operating at the higher speed.arrow_forwardIn your opinion, which do you think is better, a stepper motor or a servo motor? Why do you think so?arrow_forward
- What is the frequency (in Hz) of a motor spinning at 1740 rpm?arrow_forward(a) Describe/Illustrate in detail: Ways how to convert/transform the rotary motion (vertical or horizontal traverse) of the shaft of a motor to linear motion/displacement (prismatic). (b) Represent mathematically the relation of the rotary motion of the shaft of the motor to linear.arrow_forwardAssume that you are to design a 3V V-belt drive. Given that input speed as 1750 rpm and nominal output speed as 725 rpm. Starting with belt linear velocity 4000 ft/min, specify the input sheeve D1 from the list above. D1 = ___ in. Provide write down steps including equations. *** 8.73 and 8.9 were marked incorrectarrow_forward
- Assume that you are to design a 3V V-belt drive. Given that input speed as 1750 rpm and nominal output speed as 725 rpm. Starting with belt linear velocity 4000 ft/min, specify the output sheeve D2 once you specify D1 from last question. D2 = ___ in. Provide write down steps including equations. *** 21.07 and 21.1 were marked incorrectarrow_forwardExplain the Principles of Motor Control on how you understand it in your own words.arrow_forwardIf one node is observed at a frequency of 1000 RPM, during a whiring of a simply supported long slender rotating shaft. The first critical speed of the shaft in RPM is ______?arrow_forward
- What is the main disadvantage of using SCRs in a variable frequency drive?arrow_forwardCalculate the percentage speed regulation of a motor at full load if the machine runs at 1000 rpm at no-load and the full load speed is 900 rpm.arrow_forwardA stepping motor with 240 step angles is coupled to a leadscrew through a gear reduction of 5:1 (5 rotations of the motor for each rotation of the leadscrew). The leadscrew has 6 threads/in. The worktable driven by the leadscrew must move a distance = 10.00 in at a feed rate of 30.0 in/min. Determine: Number of pulses required to move the table, and The required motor speed and pulse rate to achieve the desired table speed.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Understanding Motor ControlsMechanical EngineeringISBN:9781337798686Author:Stephen L. HermanPublisher:Delmar Cengage Learning
Electrical Transformers and Rotating MachinesMechanical EngineeringISBN:9781305494817Author:Stephen L. HermanPublisher:Cengage Learning
Precision Machining Technology (MindTap Course Li...Mechanical EngineeringISBN:9781285444543Author:Peter J. Hoffman, Eric S. Hopewell, Brian JanesPublisher:Cengage Learning
Understanding Motor Controls
Mechanical Engineering
ISBN:9781337798686
Author:Stephen L. Herman
Publisher:Delmar Cengage Learning
Electrical Transformers and Rotating Machines
Mechanical Engineering
ISBN:9781305494817
Author:Stephen L. Herman
Publisher:Cengage Learning
Precision Machining Technology (MindTap Course Li...
Mechanical Engineering
ISBN:9781285444543
Author:Peter J. Hoffman, Eric S. Hopewell, Brian Janes
Publisher:Cengage Learning
Power Transmission; Author: Terry Brown Mechanical Engineering;https://www.youtube.com/watch?v=YVm4LNVp1vA;License: Standard Youtube License