Book Details

Electrical Machines - I

Electrical Machines - I

Published by uLektz

Course Code:RT21026

Author:uLektz

University: JNTU Kakinada

Regulation:2013

Categories:Electrical & Electronics

Format : ico_bookePUB3 (DRM Protected)

Type :eBook

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Description :Electrical Machines - I of RT21026 covers the latest syllabus prescribed by JNTU Kakinada for regulation 2013. Author: uLektz, Published by uLektz Learning Solutions Private Limited.

Note : No printed book. Only ebook. Access eBook using uLektz apps for Android, iOS and Windows Desktop PC.

Topics
Unit–I Electromechanical Energy Conversion

1.1 Introduction to S.I Units - principles of electromechanical energy conversion

1.2 Forces and torque in magnetic field systems – energy balance

1.3 Singly excited machine- magnetic force - co-energy – multi excited magnetic field system

1.4 Construction features of conventional and modern DC machines

UNIT–II D.C. Generators – I

2.1 Principle of operation – E.M.F equation

2.2 Armature winding's – lap and wave winding's – armature reaction

2.3 Cross magnetizing and de-magnetizing AT/pole – commutation process

2.4 Methods of improving commutation – compensating winding's – Inter poles

Unit–III D.C. Generators – II

3.1 Methods of excitation- self excited and separately excited

3.2 Types of generators - Build - up of emf

3.3 Open circuit characteristics - critical field resistance-critical speed-causes for failure to self excitation-remedial measures

3.4 Internal and external characteristics of separately excited, shunt, series, compound generators-applications, losses and efficiency

Unit–IV D.C. Motors

4.1 Principle of operation

4.2 Back E.M.F - torque equation –characteristics of shunt, series and compound motors

4.3 Armature reaction and commutation - losses and efficiency- speed torque characteristics-applications of dc motors

4.4 Starting by 3 point and 4 point starters – protective devices

Unit-V Speed Control and Testing of D.C. Machines

5.1 Speed control by armature voltage and field flux control

5.2 Testing of DC machines - brake test, Swinburne’s method – principle of regenerative or Hopkinson’s method - retardation test

5.3 Separation of losses

5.4 Methods of electrical braking: plugging, dynamic and regenerative

Unit–VI Design of D.C. Machines

6.1 Design concept - output equation - choice of specific electric and magnetic loading's

6.2 Separation of D and L - estimation of number of conductors/ turns - coils

6.3 Armature slots – conductor dimension – slot dimension - choice of number of poles – length of air gap

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