Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 8, Problem 3SQ
What causes the arc to move upward in a blowout magnet?
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What is the main difference between permanent and induced magnets?
Briefly explain what is Ampere's circuit law in Magnetostatic Fields.
When a bar attached to an armature moves out so that the area of the loop it makes changes?
A. is drawn toward the magnet that is generating the magnetic field
B. has no reaction to the magnetic field
C. the electrons feel a force and collect at one end, due to an induced emf
D. must rotate in order for the electrons to feel a force due to an induced emf
Chapter 8 Solutions
Electric Motor Control
Ch. 8 - Prob. 1SQCh. 8 - What is the principal difference between a...Ch. 8 - What causes the arc to move upward in a blowout...Ch. 8 - Why is it desirable to extinguish the arc as...Ch. 8 - Prob. 5SQCh. 8 - Why will the blowout coil also operate on AC?Ch. 8 - Prob. 7SQCh. 8 - Are ON control stations used in multiple locations...
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- Describe in details three practical applications for magnetostaticarrow_forwardBy changing the number of turns/ windings. Does the most effective electromagnet have more or fewer winds? TOPIC: MAGNETISMarrow_forwardFor the electromagnet of Figure-a. Find the flux density in the core.b. Sketch the magnetic flux lines and indicate theirdirection.c. Indicate the north and south poles of the magnet.arrow_forward
- What are the probable causes of a noisy magnet?arrow_forwardWhat is magnetism?arrow_forwardno more than 50 words. A self-excited DC generator has lost its residual magnetism and therefore cannot work (cannot build-up voltage), How would you restore this residual magnetism and make it work again?arrow_forward
- What is the fundamental cause of magnetic fields?arrow_forwardWhat is MMF? O Magnetic Machine Force Magnetomotive Force Magnetic Motion Force Magnetomotion Forcearrow_forwardThe total conductor in the grooves of the DA in the figure is 1440 conductors, the length of the armature is 30 cm.The magnetic flux of a pole is 0.8 tesla and the armature rotates at 4 m / s. Find the voltage value produced by the armature according to the position in the figure.arrow_forward
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