Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Textbook Question
Chapter 36, Problem 5RQ
Why are SCRs used to construct a bridge rectifier in many solid-state variable frequency drives?
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1- What are the functions of accumulators?2- Draw the hydraulic symbols for a pressure –temperature compensated flow control valveand Bidirectional motor?
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.
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1) An incremental motor. 2) A stepper motor. 3) A selsyn. 4) A fractional motor.
In speed coontrol of dc motor, the potentiometer is used as a control element.
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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,...
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- Briefly describe the operation of the three electronic sections of a variable frequency drive (VFD) using Figure 17.60 for assistance.arrow_forwardIn variable frequency drives that employ IGBTs, how is the output voltage to the motor controlled?arrow_forwardBriefly explain why a triac must be phase shifted.arrow_forward
- An 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_forwardHow many layers of semiconductor material are used to construct an SCR?arrow_forwardAn AC power source is connected across 325 turns of an autotransformer, and the load is connected across 260 turns. What is the turns ratio of this transformer?arrow_forward
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