Electric machinery fundamentals
5th Edition
ISBN: 9780073529547
Author: Chapman, Stephen J.
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Question
Chapter 3, Problem 3.2Q
To determine
The reason for the reversal of the direction of the rotating magnetic field when the supply phases are reversed.
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Students have asked these similar questions
4. A 4-pole, lap-wound armature has 144 slots with two coil sides per slot, each coil having
two turns. If the flux per pole is 20 mWb and the armature rotates at 700 rpm, what is the
induced voltage?
QUESTION 6
A DC motor armature draws 150 A while generating a magnetic flux of 0.02 Wb. The armature constant is K = 1 V
min/Wb. What is most nearly the motor's developed torque?
28.65 n-m
50.3 n-m
4,73 n-m
O 11.70 n-m
The strength of the rotating
magnetic field in a three phase
induction motor is equal to
times the flux produce
...... .......
in one of the phase windings.
1.25
1
O 1.5
Chapter 3 Solutions
Electric machinery fundamentals
Ch. 3 - What is the principal difference between a...Ch. 3 - Prob. 3.2QCh. 3 - Prob. 3.3QCh. 3 - What is the equation for the induced torque in an...Ch. 3 - The simple loop rotating in a uniform magnetic...Ch. 3 - Prob. 3.2PCh. 3 - The first ac power system in the United States ran...Ch. 3 - A three-phase, Y-connected, four-pole winding is...Ch. 3 - A three-phase, -connected, six-pole winding is...Ch. 3 - A three-phase, Y-connected, 60 Hz, two-pole...
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- A magnetic circuit with a cross-sectional area of 20 cm? is to be operated at 50 Hz from a 120 V rms supply. The number of turns required to achieve a peak magnetic flux density of 1.8 T in the core isarrow_forwardExplain in detail how AC motors develop a rotating magnetic field.arrow_forward1. Calculate the flux in a 2-pole dynamo with 722 armature conductors generating 250 V when running at 1000 r.p.m. when the armature is 1. a.) duplex lap connected O 0.06416 Wb O 0.04155 Wb 0.41056 Wb 0.00514 Wb 1. b.) simplex wave connected 0.02078 Wb O 0.04155 Wb O 0.06612 Wb O 0.12045 Wbarrow_forward
- Determine the magnetic flux (per pole) in a 100-V, 780 watts, PM motor operating at a speed of 1500 rpm. The motor constant is 88, the armature resistance is 0.7 Ω, and the rotational losses are (50) Warrow_forwardExplain how a rotating magnetic field is produced when a three phase supply is connected across the three phase stator windings of an induction motor.arrow_forwardExplain the principles of starting a slotted pole by drawing a phase diagram of fluxesarrow_forward
- Q2. A 4-pole, wave-wound armature has 72 slots with two coil-sides per slot, each coil has four turns. If the flux per pole is 20 mWb and the armature rotates at 720 rpm, what is the induced emf across the armature? (Ans. 276.48 V) 03 A 4 nolo nmeghine he umoture vith 00 clots ond o gonduetors nor elet the fluy nor nole is 005arrow_forwardA wave wound DC generator has 6 poles and the armature has 756 conductors. How fast should the armature rotate if the flux is 20 mWb per pole and 240 V is desired?arrow_forwardA4-Pole, duplex wave-wound de generator, has 144 slots with 2 coils per slot, each having two turns. If the flux per pole is is 20mWb and the armature rotates at 1500 rpm and the armature develops a power of 25kW, what will be the current in each path (in Amp)?arrow_forward
- A four pole machines generates 250V when operated at 1500 rpm. If the flux per pole is 1.85 x 106 maxwell, the number of armature slots is 45 and the armature winding has two parallel paths. If the speed of the generator is reduced to 1350 rpm, what would be the generated voltage. To what value of flux per pole should the excitation be adjusted if the generated voltage is to remain the same at 250Varrow_forwardA simple generator has a square armature 9.0 cm on a side. The armature has 80 turns of 0.59-mm-diameter copper wire and rotates in a 0.700-T magnetic field. The generator is used to power a lightbulb rated at 12.0 V and 25.0 W. Part A At what rate should the generator rotate to provide 12.0 V to the bulb? Consider the resistance of the wire on the armature. Express your answer to two significant figures and include the appropriate units. HA ? f = Value Unitsarrow_forwardA 3-phase, 6-pole, 60-Hz, Y-connected AC generator has a stator with 48 slots, each slot contains 20 conductors. The coils of each phase are connected in series. The flux density is 0.5 T. What is the speed of rotation of the stator magnetic field in RPM ? Select one: O a. 600 RPM O b. 1200 RPM O c. 1500 RPM O d. None Clear my choicearrow_forward
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