Electrical Machines - I
Technical Publications, 2008 - 603 pages
Basic Concepts of Rotating MachinesPrinciples of electromechanical energy conversion Single and multiple excited systems m.m.f of distributed A.C. windings Rotating magnetic field Generated voltage Torque in round rotor machine.D.C. GeneratorsConstructional details emf equation Methods of excitation Self and separately excited generators Characteristics of series, shunt and compound generators Armature reaction and commutation Parallel operation of DC shunt and compound generators.D.C. Motors Principle of operation Back emf and torque equation Characteristics of series, shunt and compound motors Starting of DC motors Types of starters Speed control of DC series and shunt motors.Transformers Constructional details of core and shell type transformers Types of windings Principle of operation emf equation Transformation ratio Transformer on no-load Parameters referred to HV / LV windings Equivalent circuit Transformer on load Regulation Parallel operation of single phase transformers Autotransformer Three phase transformers Vector group.Testing of DC Machines and Transformers Losses and efficiency in DC machines and transformers Condition for maximum efficiency Testing of DC machines Brake test, Swinburne s test, Retardation test and Hopkinson s test Testing of transformers Polarity test, load test, open circuit and short circuit tests All day efficiency.
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Chapter 1 Electromechanical Energy Conversion 1 1to1 42
Testing of Transformers 7 1 to 7 42
C Generators 31to3104
Chapter 2 Basic Concepts In Rotating Machines 21 to 242
Chapter 5 Testing of D C Machines 51 to 548
Chapter 6 Transformers 61 to 6158
Examples with Solutions 6 114
Review Questions 6155
air gap ampere angle armature conductors Armature Cu loss armature current armature reaction armature resistance armature winding autotransformer axis back e.m.f. bus bar voltage Calculate called co-energy coil side coilsides component copper loss core critical resistance d.c. machine d.c. motor d.c. series motor d.c. shunt motor delta connection direction eddy current efficiency electrical energy Example field current field resistance flux density flux per pole flux produced Hence Ia Ra increases induced e.m.f. iron losses Key Point lagging magnetic field maximum mechanical method number of turns open circuit output parallel operation phasor phasor diagram pole pitch power factor primary side reactance rheostat rotating rotor rotor machine secondary side separately excited series field winding short circuited shown single phase transformers sinusoidal slots Solution stator stray losses supply voltage terminal voltage three phase transformer torque voltage drop volts winding transformer zero