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Machines

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BASIC PRINCIPELS AND FUNTIONS OF ELECTRICAL MACHINES
CONTENTS
* Abstract1
* Introduction 2
* CLASSIFICATIONS OF
ELCTRICAL MACHINES 3
* BASIC FEATUREIS OF
ELCTRICAL MACHINES6
* Basic principal &
Operation9
* Determination of machine
Parameters9
* Electrical machine
Protection & maintenance 10
* Applications12
* Conclusion13
* Reference13

ABSTRACT
Recent advances in power electronics and high-speed microprocessors have led to considerable attention in electrical machines with regard to their applications in industrial drives. This paper brings to the fore, various types of electrical machines, their operations, and applications, as well as the method of determining their parameters. Various ways of protecting electric machines against overloads and mechanical faults are also highlighted. It is anticipated that the work presented in this paper will be of immense benefit to practicing engineers especially in areas of machine design, maintenance, and protection.

INTRODUCTION
The Direct Current (D.C.) machine, the synchronous machine, and the induction machine are the major electromechanical conversion devices in industry. The merits of the squirrel cage induction machine are: lightness, simplicity, ruggedness, robustness, less initial cost, higher torque-inertia ratio, capability of much higher speeds, ease of maintenance, etc . The most important feature which declares it as a tough competitor to D.C. machines in the drives field is that its cost per KVA is approximately one fifty of its counter-part and it possesses higher suitability in hostile environment. Unfortunately, induction machines suffer from the drawback that, in contrast to D.C. machines, their speed cannot be easily and effectively adjusted continuously over a wide range of operating conditions . On the other hand, the synchronous machine has the merit of being...

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