6. What is the function of commutator in a DC machine in generator action.7. Which are the different types of armature windings commonly used in DC machines?8. Which is the best-suited material for commutator segments?10. Why are the graphite or carbon brushes preferred over copper brushes for use in DC machines?

Answered: What is the function of commutator in a…

What is the function of commutator in a DC machine in generator action. Which are the different types of armature windings commonly used in DC machi

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter57: Dc Variable-speed Control-motor Drives

Section: Chapter Questions

Problem 8SQ

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Concept explainers

DC Series Motors

A DC motor is a type of electric motor which converts electric energy into mechanical energy. The forces that are produced by the magnetic field are what those common types of motors rely upon. Either electro-mechanical or electronic, all types of DC motors have some internal mechanism to change the current direction in part of the DC motors. As the DC motors could be powered from existing DC lighting power distribution systems, these motors were the first form of motors widely used. By changing the strength of the current in its field winding or by using a variable supply voltage, the speed of the DC motors can be controlled over a wide range.

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6. What is the function of commutator in a DC machine in generator action.
7. Which are the different types of armature windings commonly used in DC machines?
8. Which is the best-suited material for commutator segments?
10. Why are the graphite or carbon brushes preferred over copper brushes for use in DC machines?

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An 8 pole DC shunt generator with wave winding has 4800 conductor with 20 turns and average per pole flux is 20 mwb and armature current and armature resistance is 20 A and 0.5 ohm respectively find? (i) Induced emf (ii) Terminal voltage
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The following sequential statements, when completed, describe armature reaction in a DC generator. Complete each statement by inserting the appropriate word from among those provided in the word list below. Notes: A word may be used more than once. There are more words than required. Word list:armature, between, brushes, clockwise, commutator, currents, direction, distortion, increase, induces, inline, interpoles, main-field, neutral-plane, power, rotating, rotation, slip-rings, slow-down, sparking, speed, torque, voltage. The effects of armature reaction can be reduced by equipping the DC machine with _________________ connected in series with the _______________, or by physically shifting the position of the __________________. If this is not done _______________ will occur at the brushes and the generator output ________________ will be reduced. Prolonged operation in this state can lead to sustained damage to the brushes and _________________.
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