Industrial Motor Control
7th Edition
ISBN: 9781133691808
Author: Stephen Herman
Publisher: Cengage Learning
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Chapter 46, Problem 5RQ
Why are SCRs used to construct a bridge rectifier in many solid-state variable frequency drives?
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Chapter 46 Solutions
Industrial Motor Control
Ch. 46 - Prob. 1RQCh. 46 - Prob. 2RQCh. 46 - If an alternator is used to provide variable...Ch. 46 - What solid-state device is generally used to...Ch. 46 - Why are SCRs used to construct a bridge rectifier...Ch. 46 - What is the main disadvantage of using SCRs in a...Ch. 46 - How are junction transistors driven into...Ch. 46 - What is the disadvantage of driving a junction...Ch. 46 - Prob. 9RQCh. 46 - In variable frequency drives that employ IGBTs,...
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- What is the main disadvantage of using SCRs in a variable frequency drive?arrow_forwardWhat solid-state device is generally used to produce variable frequency in drives designed to control motors up to 500 HP?arrow_forwardProblem 1 3-Phase AC Machinery Principles Part 1: Complete the following table by calculating the speed of magnetic field rotation in AC machines depending on the number of poles and the operating frequency. Number of Speed (RPM) Poles Frequency f = 50 Hz Frequency f= 60 Hz 4 6. 10 Solutionarrow_forward
- As shown in the figure below, this is a speed regulation method for DC separately excited motor. a) What is the speed regulation method? b) What are the characteristics for this speed regulation method? B no Ra le lo R: '3 E R3 Tr. Tarrow_forwardHow many layers of semiconductor material are used to construct an SCR?arrow_forwardAn inductor has an inductive reactance of 250 Ω when connected to a 60-Hz line. What will be the inductive reactance if the inductor is connected to a 400-Hz line?arrow_forward
- A. Incident sound waves in a dynamic pickup or microphone lead to the passage of AF current in the coil because- 1) The coil's motion within a magnetic field. 2) The motion within an electrostatic field.3) A DC voltage is applied to the coil. 4) Changes in the capacitive reactance across the coil. B. An intermittent (as opposed to continuous) motor is one in which the shaft revolves in- 1) An incremental motor. 2) A stepper motor. 3) A selsyn. 4) A fractional motor.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_forwardWhat is the front controller class of Spring MVC?arrow_forward
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