Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 39, Problem 4SQ
To determine
Explain the process of a rotor magnetic field establishment.
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Chapter 39 Solutions
Electric Motor Control
Ch. 39 - Prob. 1SQCh. 39 - What is the effect of the starting winding of the...Ch. 39 - What are typical applications of synchronous...Ch. 39 - Prob. 4SQCh. 39 - A loaded synchronous motor cannot operate...Ch. 39 - Why must a discharge resistor be connected in the...Ch. 39 - Depending on their power factor ratings, what is...Ch. 39 - At what power factor do incandescent lights...Ch. 39 - Prob. 9SQCh. 39 - The speed of a synchronous motor is fixed by the...
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- How the rotating magnetic field is produced. Explain its importance in the operation of an Induction Motors.arrow_forwardQ25) i) What are the factors that the induced voltage in three phase induction motor depends upon and Explain how the rotating magnetic field is produced in the three phase induction motor.arrow_forwardThe armature of a 6 pole, lap wound dc machine has 54 slots. Each coil has 15 turns. The average flux density is 1.2 T. The armature length is 15 cm and the diameter is 30 cm. The magnetic poles are designed to cover 90% of the surface area. If the armature speed is 1200 rpm, determine the(i) induced emf in the armature winding (ii) induced emf in the coil(iii) induced emf per turn induced (iv) emf in each conductor(v) What is the power and torque if each conductor is rated at 10 amps?(vi) Which of the above values would change if the generator was wave connected?arrow_forward
- Q3: Each ferromagnetic material has a remanence in its magnetic characteristics, but they are not all suitable to be used in a permanent magnet motor! Explain why? And show the required magnetic characteristics suitable for that job. This question is about specialized machinesarrow_forwarda. Explain how a rotating magnetic field is produced in a three-phase induction motor. b. Explain the rotor action on a three-phase squirrel cage motor when the load increases from NO-LOAD to rated FULL- LOADarrow_forwardThe total conductor of the direct current generator shown in the figure is 1440. The length of the armature is 30cm, the magnetic flux of a pole is 0.8 Tesla and the armature rotates at a speed of 4 m / s. Find the value of the voltage generated by the armature according to the position in the figure.arrow_forward
- The armature of a four-pole 200 V, lap wound generator has 400 conductors and runs of 300 rpm. Determine the useful flux per pole. If the number of turns in each field coil is 900, what is the average induced emf in each field coil on breaking its connection if the magnetic flux set-up by it dies away completely in 0.1 second?arrow_forwardQ)Why does the magnetization curve of D.C. shunt machine bend as the field current increases?arrow_forwardExplain the construction and advantages of a Darrieus Rotor windmillarrow_forward
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