Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 42, Problem 9SQ
How does the AC coil of the PFR receive the induced field current without receiving the full field current strength?
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Chapter 42 Solutions
Electric Motor Control
Ch. 42 - What are the two basic methods of automatically...Ch. 42 - What is an out-of-step relay?Ch. 42 - Why is an out-of-step relay used on automatic...Ch. 42 - Under what conditions will the out-of-step relay...Ch. 42 - What is the last control contact that closes on a...Ch. 42 - What influence do both of the polarized field...Ch. 42 - Prob. 7SQCh. 42 - Approximately how much time (in terms of...Ch. 42 - How does the AC coil of the PFR receive the...Ch. 42 - Why is a control relay (CR1) used in Figure 426?...
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- 11. Why is the conduction angle greater with an inductive load than with a purely resistive load? 12. For a full-wave phase control circuit draw the output voltage and current waveforms when firing angle α = (45-X)° (Here X= 10). Consider the load to be inductive. 13. What point in a single-phase ac waveform is used as a reference point for timing the thyristor gate pulses?arrow_forwardWhat is dc and what is ac ?arrow_forwardWhat is the difference between the AC and DC supplies?arrow_forward
- What will be the far field distance if the dimention of radiator is 1 m and the operating frequency is 900 MHz?arrow_forwardSuppose we have an ac current flowing through a coil wound on an iron core. Name two mechanisms by which energy is converted to heat in the core material. For each, how is the core material selected to minimize the power loss? How does each power loss depend on the frequency of the ac current?arrow_forwardWhat is the commutator pitch of a 4-pole, duplex wave-wound armature having 120 commutator bars?arrow_forward
- Explain in really basic terms what is electric and magnetic field ‘? What is TEM mode explain in very basic way anyone can understand?arrow_forwardAn AC motor is run from an AC supply connected to an AC voltage controller with firing angle of 30 degrees. If the motor operates at 100V RMS and draws a current of 10A, and there is a series resistance of 5ohm associated with the motor, what is the RMS voltage of the AC supply that needs to be connected to the AC voltage controller to drive the motor?arrow_forwardA machine's armature winding is in progressive wave type if the number of conductors is 670 with 4 poles used determine the average pitch of the winding assemblyarrow_forward
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