Electric machinery fundamentals
5th Edition
ISBN: 9780073529547
Author: Chapman, Stephen J.
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Textbook Question
Chapter 3, Problem 3.6P
A three-phase, Y-connected, 60 Hz, two-pole synchronous machine has a stator with 5000 turns of wire per phase. What rotor flux would be required to produce a terminal (line-to-line) voltage of 13.2 kV?
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Students have asked these similar questions
An 10-pole d.c. generator has 440 armature
conductors, and a useful flux of 36 mWb per pole.
What will be the e.m.f. generated if it is lap-
connected and runs at 1310 rpm? What must be
the speed at which it is to be driven produce the
same e.m.f. if it is wave-wound?
Generated voltage
speed
An 8- pole dc generator has 500 armature conducters and a useful flux of
0.05 Wb.
A. What will be the emf generated, if it is lap- connected and runs at
1200 rpm?
B.
What must be the speed at which it is to be driven to produce the
same emf if it is wave wound.
2. A 4-pole machine has an armature with 90 slots and 8 conductors per slot, the flux per pole is 0.05 Wb
and runs at 1200 rpm. Determine induced emf if winding is (i) lap connected (i) wave connected.
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 8 pole wave wound dc shunt generator runs at a speed of 1450 rpm, has an armature and shunt field resistance of 0.7 Q and 240 Q respectively. The armature has 910 conductors and flux per pole is 0.115 Weber. If the lamp load connected has a resistance of 20 0, determine (i) Generated EMF (ii) Total Resistance (iii) Armature Current (iv) Terminal Voltage.arrow_forwardA 2 pole wave wound dc generator has 44 slots, each slot having 20 conductors. The flux/pole is 0.018 weber. At what speed the armature be rotated to get an induced emf of 220 V. What will be the induced emf developed if the armature winding is lap connected and runs at the same speed. Speed Generated Emf when lap connectedarrow_forwarda 6-pole dc generator has 500 armature conductors, and a useful flux of 0.05Wb per pole. What will be the emf generated if it is a lap-connected and runs at 1200rpm? what must be the speed at which it is to be driven to produce the same emf if it is wave-wound ?arrow_forward
- A four-pole Shunt connected generator has a lap connected armature with 728 conductors. The flux per pole is 25mWb. If the generator supplies one hundred incandescence lamp (100V, 60 W). The shunt field and armature resistance are 100 ohms and 0.015 ohms respectively. WHAT IS THE GENERATED VOLTAGE ?arrow_forwardA 4-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 value of its constant "K" for this machine?arrow_forwardAn 6-pole d.c. generator has 515 armature conductors, and a useful flux of 10 mWb per pole. What will be the e.m.f. generated if it is lap-connected and runs at 970 rpm? What must be the speed at which it is to be driven produce the same e.m.f. if it is wave-wound? Eg Speedarrow_forward
- A 4 pole machine running at 1500 rpm has an armature with 90 slots and 6 conductor per slot. The flux per pole is 10mWb. Determine the terminal emf as DC generator if the coils are lap connected. If the current per conductor is 100A, determine the electrical power.arrow_forwardThe simplex lap DC generator has 4 poles, 16 slots, with a constant rpm of 600 rpm and 4 conductors per slot. Determine the following: a. Flux per pole (Ø) b. Commutator Pitch c. Pole Pitch d. Coil Pitcharrow_forwardA 4 pole, dc shunt generator an armature resistance of 0.06 ohm and shunt field resistance of 60 ohms hast 150 duplex wave-connected conductors in its armature. The flux per pole is 0.09 Wb. If the terminal voltage is 300V and driven at 1500 rpm, what is the power absorbed by the load.arrow_forward
- Q 5. A wave-wound armature of a 6-pole generator has 51 slots. Each slot contains 20 conductors. The voltage required to be generated is 250 V. What would be the speed of coupled prime mover if flux per pole is 0.07 Wb. If the armature is rewound as lap-wound machine and run by same prime mover, what will be the generated voltage? (Ans. 70 rpm; 83.3 V)arrow_forwardA 2 pole wave wound dc shunt generator runs at a speed of 750 rpm, has an armature and shunt field resistance of 0.9 Q and 280 Q respectively. The armature has 880 conductors and flux per pole is 0.115 Weber. If the lamp load connected has a resistance of 30 Q, determine (i) Generated EMF, (ii) Total Resistance, (iii) Armature Current, (iv) Terminal Voltage.arrow_forwardAn 10-pole d.c. generator has 390 armature conductors, and a useful flux of 32 mWb per pole. What will be the e.m.f. generated if it is lap-connected and runs at 1070 rpm? Egarrow_forward
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