a) A triplex lap-wound armature is use in a 14 poles machine with14 brushes sets, each spanning three commutator bars.Calculate the number of parallel paths in the armature.b) Repeat a) for a triplex wave-wound armature having two suchbrush sets and 14 poles.c) Calculate the generated emf in each of the above problems, ifthe flux per pole is 4.2x106 lines, the generated speed is 60rpm,and there are 420 coils in the armature, each coil having 20turns.

Answered: Image /qna-images/answer/3f4899da-4329-4224-89df-3b529eace5e2.jpg

Answered: a) A triplex lap-wound armature is use…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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Similar questions

A 4pole lap wound armature when driven at 600rpm generates 120V. if the flux per pole I 25mWb, find the number of armature conductors.
An 8 pole, lap-wound armature has 1200 conductors and a flux pole is 0.06wb. Determine the e.m.f generated when the dc machine running at 600 rev/min.
A dc motor has an armature containing 192 conductors, 70 percent of which lie directly under the pole faces at any given instant. If the flux density under the poles is 52,000 lines per square inch and the armature diameter and length are 12 in and 4.5 in., respectively, calculate the current in each armature conductor for a torque of 120 lb-ft.
The armature reaction of the DC generator increases the generated EMF. Select one: True False
The armature of DC machine has an outer diameter 55cm and effective Length is 25cm, the armature has a wave winding consisting 488 conductors. The number of poles is 6 poles, each pole producing a flux 43mw. Calculate the conductor e.m.f and the total armature e.m.f, when speed is 1000
Consider the rotational translational mechanical system as shown in Figure Q1(a):
DC MACHINE TORQUE The armature of a dc motor has 648 conductors, 65 % of which are directly under thepole where the flux density is 48,000 lines per in2. If the core diameter is 7 inchesand its length is 4 inches and the current in each conductor is 20 A. What is thetorque exerted in the armature in N-m?
The 4-pole direct current electric machine works as a generator. In this direct current machine, which also has auxiliary poles, the direction of the excitation flux is from bottom to top at the remaining pole located at the top of the armature from the main poles on the d axis. As the current direction is ๏ in armature conductors corresponding to the same pole; (show by drawing the figure)a. The direction of flux at the main polesb. Current direction at main polesc. Direction of flux at auxiliary polesD. Direction of current at auxiliary polesto. Direction of rotation
The 4-pole direct current electric machine works as a generator. In this direct current machine, which also has auxiliary poles, the direction of the excitation flux is from bottom to top at the remaining pole located at the top of the armature from the main poles on the d axis. As the current direction is ๏ in armature conductors corresponding to the same pole; (show by drawing the figure)a. The direction of flux at the main polesb. Current direction at main polesc. Direction of flux at auxiliary polesD. Direction of current at auxiliary polese. Direction of rotation
A 4-pole, lap wound, d.c machine has total number of 800 armature conductors and produces 0.03 Wb flux per pole when field is excited. If the machine is driven by a prime mover at 1000 rpm, calculate the generated emf across the armature. If the generator is loaded to deliver an armature current of 50 A, Calculate the prime mover and electromagnetic torques developed at this load current. Neglect frictional torque.
A 4-pole, simplex lap wound, direct current armature has 48 slots containing 48 coils, each of two turns. The flux per pole, in the field structure for this armature, is 692000 maxwell. Calculate the speed for this machine in order that its generated emf is 220 V.
5. A d.c. shunt machine has armature and field resistances of 0.025 Ω and 80 Ω respectively. When connected to constant 400-V bus-bars and driven as a generator at 450 r.p.m., it delivers 120 kW. (a) Calculate its speed when running as a motor and absorbing 120 kW from the same bus-bars. (b) Deduce the direction of rotation of this machine when it is working as a motor assuming a clockwise rotation as a generator

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