Earth Is the Lords
5th Edition
ISBN: 9781121660069
Author: Caldwell, Taylor
Publisher: MCG/CREATE
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Textbook Question
Chapter 1, Problem 1.23P
For the linear machine of Problem 1-22:
- When this machine is operating as a motor, calculate the speed of the bar for loads of O N to 30 N in 5 N steps. Plot the speed of the bar as a function of load.
- Assume that the motor is operation with a 30 N load, and calculate and plot the speed of the bar for magnetic flux densities of 0.3 T to 0.5 T in 0.05 T steps.
- Assume that the motor is running at no-load conditions with a flux density of 0.5 T. What is the speed of the bar? Now apply a 30 N load to the bar. What is the new speed of the bar? What flux density would be required to restore the loaded bar to the same speed that it had under no-load conditions?
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Question
(1). The current in a conductor on the armature of a dc motor is 300A. The flux under the poles is 850μWb. The area per pole is 700 mm2. The length of the conductor on the armature is 640mm. Calculate the force exerted on the conductor.
Question 3.4
(3.4)The length of a magnetic circuit in a moving iron instrument is 300mm. The coil around the soft-iron core has 360 turns and takes a current of 1.75 A. The core is square in section with sides of 20 mm. Take the relative permeability of soft iron as 1100.
3.4.1) Determine the magnetomotive force in the core
3.4.2)Determine the field strength
3.4.3) Determine the total flux
The armature of a d.c. The machine has a resistance of 0.25 ohm and is connected to a 300V supply. Determine the e.m.f. generated when it runs as a generator giving 100 A and as a motor taking 80 A.
please check the back emf calculations
19/. If the e.m.f. of a DC machine is two times bigger while the flux on the pole is also two times more, with all parameters constant, then speed of the dc machine becomes______________.
no change in speed
4 times the actual speed
1/2 times the actual speed
2 times the actual speed
Chapter 1 Solutions
Earth Is the Lords
Ch. 1 - What is torque? What role does torque play in the...Ch. 1 - What is Amperes law?Ch. 1 - What is magnetizing intensity? What is magnetic...Ch. 1 - How does the magnetic circuit concept aid in the...Ch. 1 - What is reluctance?Ch. 1 - What is a ferromagnetic material? Why is the...Ch. 1 - How does the relative permeability of a...Ch. 1 - Prob. 1.8QCh. 1 - What are eddy current losses? What can be done to...Ch. 1 - Why are all cores exposed to ac flux variations...
Ch. 1 - What is Faraday law?Ch. 1 - What conditions are necessary for a magnetic field...Ch. 1 - What conditions are necessary for a magnetic field...Ch. 1 - Prob. 1.14QCh. 1 - The linear machine in Figure 1-19 is running at...Ch. 1 - Just how does a decrease in flux produce an...Ch. 1 - Will current be leading or lagging voltage in an...Ch. 1 - What are real, reactive, and apparent power? What...Ch. 1 - What is power factor?Ch. 1 - Prob. 1.1PCh. 1 - A flywheel with a moment of inertia of 4kgm2 is...Ch. 1 - A force of 10 N is applied to a cylinder of radius...Ch. 1 - A motor is supplying 50Nm of torque to its load....Ch. 1 - A ferromagnetic core is shown in Figure P1-2. The...Ch. 1 - A ferromagnetic core with a relative permeability...Ch. 1 - A two-legged core is shown in Figure P1-4. The...Ch. 1 - A core with three legs is shown in Figure P1-5....Ch. 1 - A two-legged core is shown in Figure P1-4. The...Ch. 1 - A wire is shown in Figure P1-7 that is moving in...Ch. 1 - Repeat Problem 1-10 for the wire in Figure P1-8.Ch. 1 - Prob. 1.12PCh. 1 - A core with three legs is shown in Figure P1-10....Ch. 1 - A two-legged magnetic core with an air gap is...Ch. 1 - A transformer core with an effective mean path...Ch. 1 - The core shown in Figure P1-2 has the flux shown...Ch. 1 - Prob. 1.17PCh. 1 - Prob. 1.18PCh. 1 - Prob. 1.19PCh. 1 - Demonstrate that Equation (1-59) can be derived...Ch. 1 - Prob. 1.21PCh. 1 - Prob. 1.22PCh. 1 - For the linear machine of Problem 1-22: When this...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- i. Calculate the current that required to produce a flux density of 0.5 T in the central leg of the core. ii. Calculate the current that required to produce a flux density of 1.0 T in the central leg of the core? Is it twice the current in Q1(b) (i). iii. Calculate the reluctances of the central and right legs of the core under the conditions in Q1(b) (i). iv. Calculate the reluctances of the central and right legs of the core under the conditions in Q1(b) (ii). v. Explain the conclusion that you can make about reluctances in real magnetic cores.arrow_forwardSOLVE AND SHOW YOUR COMPLETE SOLUTION. ANSWERS SHOULD BE IN TWO DECIMAL PLACES. The armature of a two-pole dc machine has 30 slots, each slot has 4 conductors each. during its operation, only 75% of the conductors are directly under the pole. each pole measures 2 inches by 3 inches and produces ten million maxwells of flux. the armature core is 12 inches in length and 3.5 inches in diameter. the total resistance of the winding is 2 ohms. b) determine the total generated voltage if the armature is running at 1000 rpm and its winding is simplex lap connected.arrow_forwardConsider the magnetic circuit in figure. A current of (3A) flowsthrough 200 turns of wire around a core of cross sectional aea of10-3 m2 and a relative permeability of 5000.a) Determine the magnetic flux in each legb) Determine the magnetic field intensity in the air gapc) Determine the magnetic force on the across the air gaparrow_forward
- SOLVE AND SHOW YOUR COMPLETE SOLUTION. ANSWERS SHOULD BE IN TWO DECIMAL PLACES. The armature of a two-pole dc machine has 30 slots, each slot has 4 conductors each. during its operation, only 75% of the conductors are directly under the pole. each pole measures 2 inches by 3 inches and produces ten million maxwells of flux. the armature core is 12 inches in length and 3.5 inches in diameter. the total resistance of the winding is 2 ohms. c) determine the total generated voltage if the armature is running at 1000 rpm and its winding is simplex wave connected.arrow_forwardA DC series motor is running with a speed of 800 RPM, while taking a current of 20A from the supply. If the load is changed such that the current drawn by motor is increased to 50 A. Calculate the speed of the motor on new load. The armature and series field winding resistance are 0.2Ω and 0.3Ω respectively. Assume the flux produced is proportional to the current. Assume supply voltage is 250V.arrow_forwardSOLVE AND SHOW YOUR COMPLETE SOLUTION. ANSWERS SHOULD BE IN TWO DECIMAL PLACES. The armature of a two-pole dc machine has 30 slots, each slot has 4 conductors each. during its operation, only 75% of the conductors are directly under the pole. each pole measures 2 inches by 3 inches and produces ten million maxwells of flux. the armature core is 12 inches in length and 3.5 inches in diameter. the total resistance of the winding is 2 ohms. d) determine the total force tending to rotate the armature core in lbs, if the winding is simplex lap connected.arrow_forward
- 1. It is the change of flux with respect to time multiplied by the number of turns. 2. The property of magnetic material to allow the magnetic flux to flow. 3. If the current of energy stored in a magnetic field is doubled, what will happen to the energy?arrow_forwardB. Write down the expression of voltage induced voltage when DC machine act as I. Motor II. Generatorarrow_forwardA square magnetic core has a mean path length 55cm and x-sectional area of 150cm2. A 200 turns coil of wire is wrapped around one leg of the core. The core is made of the material having relative permeability 3980. Find • How much current is required to produce 0.012 Wb of flux in the core • Calculate the reluctance and magnetomotive force.arrow_forward
- What is the difference between a thermal overload and a magnetic overload? Draw the symbol for each.arrow_forwardHow much is 1 line of flux in Webers?arrow_forwardTHIS QUESTION IS FROM BOOK ELECTRIC MACHINE 1 FROM TOPIC DC MOTOR A 255 V, DC lathe machine, (not a 2 pole machine) has armature resistance and series resistance are0.15Ω and 170Ω respectively. The motor has 25mWb flux per pole. The ratio of pole to parallel pathsis unity. The product of this ratio and number of turns in armature section is 1000. When it runs light, ithas a speed of 1200 rpm. If it runs at maximum load, it takes a current of 70A. (1) Which machine is this one, shunt or series ?(2) Is machine lap wound or wave wound?(3) Calculate the no load back EMF.(4) Calculate the no load armature current.(5) Calculate the no load shunt current.(6) Calculate the current drawn by the machine.(7) Calculate the variable losses on load.(8) Calculate the armature power when it runs light.(9) Calculate the stray losses when it runs light.(10) Calculate the full load armature current.(11) Calculate the full load back EMF.(12) Calculate the Variable losses on maximum possible load.(13)…arrow_forward
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