Electric machinery fundamentals
5th Edition
ISBN: 9780073529547
Author: Chapman, Stephen J.
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Question
Chapter 3, Problem 3.8P
To determine
The direction of the induced torque in the given machine also, find whether the machine is acting as a motor or generator.
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A self-excited DC generator has lost its residual magnetism and therefore cannot work (cannot build-up voltage),
How would you restore this residual magnetism and make it work again?
A dc shunt generator delivers 50 kw at 250 v, its armature has a 4-pole wave winding with a resistance of 0.01 ohm and its field resistance is 125 ohm. if the number of turns in the armature is 201 and the flux per pole is 0.02 wb, find the voltage generated and the speed of operation. *
Explain the types of DC generators.
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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- An 8-pole dc generator has 500 armature conductors, and useful flux of 0.05 Wb perpole. What will be the emf generated if it is lap connected and runs at 1200 rpm? Whatmust be the speed at which it is to be driven to produce the same emf if it is waveconnected and the flux is reduced to 80% of its value when lap connected?arrow_forwardJustify why an electrostatic motor cannot be operated from dc supply.Derive the expression of average torque of this motor when it is suppliedfrom ac sourcearrow_forwardQ2) In DC machine, the speed is 800 RPM, the flux per pole is 2 m wb, and it has a Lap winding armature with 6 coils (4 turns conductor per coil) . The DC machine has 2 poles and armature draws lc= 5.5 A. If the winding redesigned as wave winding, find the EA , Tem and Pem and explain what will happen when we change the design from lap to wave winding connection.arrow_forward
- How is a rotating magnetic field produced in a three-phase induction motor? Explain itwith the help of suitable diagrams.arrow_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_forwardIf a self-excited generator has lost all magnetism, can it build up an output voltage? Explain. of its residual Does a generator slowly lose its residual magnetism with time? How would you get a generator to work after it had lost all its residual magnetism?arrow_forward
- a 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_forwardAn 8-pole dc generator has 500 armature conductors and a useful flux of 0.05 Wb. What will be the emf generated, if it is lap connected and runs at 1200 rpm? What must be the speed at which it is to be driven to produce the same emf, if it is wave wound?arrow_forwardExplain how the magnetization curve is measured for a dc machine.arrow_forward
- A 4-pole, D C machine has 144 slots in the armature with two coil-sides per slot, each coil has two turns. The flux per pole is 20 m Wb, the armature is lap wound and if rotates at 720 rpm, what is the induced emf (i) across the armature (ii) across each parallel path?arrow_forwardWhat is the ratio of the fixed self-power E1 to the rotor electromotive force E2 by the effective winding cost of the stator and the rotor when the rotor is rotating at the slip s?arrow_forwardA 900 rpm, 4 pole wave wound shunt motor takes 300 A. The flux per pole is 0.02 Wb and the armature has 1500 conductors. The shunt field takes 4 A of current. Solve for power developed in the armature (W).arrow_forward
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