Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 59, Problem 9SQ
To determine
List the probable causes for the failure of a coil to pick up.
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A 120-V-rms 60-Hz sinusoidal voltage appears across a 500-turn coil. Determine the peak and rms values of the flux linking the coil.
ii) An emf, 2.5kV induced in a coil when a current of 2.75A collapses uniformly to 1.7SA
in 4ms. Determine the flux induced in the coil in Webber-turns.
What factors affect the magnitude of the induced voltage in a coil?
Chapter 59 Solutions
Electric Motor Control
Ch. 59 - Prob. 1SQCh. 59 - Why should the motor be run for a period of time...Ch. 59 - What may occur if a jumper is placed across coil M...Ch. 59 - In what position do ball-bearing motors function?Ch. 59 - Motors will operate satisfactorily at what percent...Ch. 59 - What basic sensory faculties should a...Ch. 59 - What is an orderly step-by-step procedure in...Ch. 59 - What might be a hazard if a motor is started in...Ch. 59 - Prob. 9SQCh. 59 - What are the probable causes of a noisy magnet?
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- True False In self-excited DC generator, the residual flux is primary condition in e.m.f generation Answer by true or false * True False The flux of shunt wound DC generator induced during loadingarrow_forward7. Name three factors that determine the amount of induced voltage in a coil.arrow_forwardState the Method of connection of different field coils. ( In DC Machines )arrow_forward
- Please answer this NEATLY, COMPLETELY, and CORRECTLY for an UPVOTE. The coil of a generator has an equivalent resistance of 1.5 ohms at 20 °C. After being used for several hours, the resistance is found to be 1.75 ohms. Determine the temperature of the coils at this time. The temperature coefficient of resistance at 0 °C of the coil is 0.004 OC-1.arrow_forwardThe self inductance of a coil is a. Inversely proportional to current b. Inversely proportional to flux c. Inversely proportional to number of turns d. Directly proportional to currentarrow_forwardProbl The rectangular coil in the figure below is in a field B = 0.01a,T. a. Find the torque about the z axis when the coil is in the position shown and carries a current of 10 A b. Find the torque if the coil turns through 90°7 0.2m & 0.2m 1-10Aarrow_forward
- 4. Given the circular coil shown below, calculate the magnitude of: a. Magnetic moment b. Torque on the coil B-23T 23 r=25 inch I=45.0Aarrow_forward3. How does a split ring commutator work? * Coll rotation Coil Commutator a) Swaps the contact every full turn, so that the left-hand and right-hand arms of t coil always experience a force in the same direction. b) Swaps the contact every half turn, so that the left-hand and right-hand arms of coil do not experience a force in the same direction. c) Swaps the contact every half turn, so that the left-hand and right-hand arms of coil always experience a force in the same direction.arrow_forward1. A coil has 500 turns and a reactance of 60 ohms but negligible resistance. If it is connected to a 120 V, 60 Hz source. Calculate the following: a. The effective value of the magnetizing current, b. The peak value of lo C. The peak mmt produced by the coil. d. the peak fluxarrow_forward
- Q9 / What are the function of brushes , pole and commutator in DC machinearrow_forwardDescribe the purpose of the engine pickup coil and how it relates to Faraday’s law.arrow_forwardThe magnetic flux through each turns off a 100-turn coil is (³-2) milli-webers where t is in seconds. The induced EMF at t = 2 second is?arrow_forward
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