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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
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
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
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
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
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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CategoriesElectrical & Electronics
Format EPUB
TypeeBook