EE6504 - Electrical Machines - II
, Syllabus
• UNIT I SYNCHRONOUS GENERATOR
• Constructional details – Types of rotors –winding factors- emf equation – Synchronous
reactance – Armature reaction – Phasor diagrams of non salient pole synchronous
generator connected to infinite bus--Synchronizing and parallel operation – Synchronizing
torque -Change of excitation and mechanical input- Voltage regulation – EMF, MMF, ZPF
and A.S.A methods – steady state power angle characteristics– Two reaction theory –slip
test -short circuit transients - Capability Curves
• UNIT II SYNCHRONOUS MOTOR
• Principle of operation – Torque equation – Operation on infinite bus bars - V and Inverted V
curves – Power input and power developed equations – Starting methods – Current loci for
constant power input, constant excitation and constant power developed-Hunting –
natural frequency of oscillations – damper windings- synchronous condenser.
• UNIT III THREE PHASE INDUCTION MOTOR
• Constructional details – Types of rotors –- Principle of operation – Slip –cogging and
crawling- Equivalent circuit – Torque-Slip characteristics - Condition for maximum torque –
Losses and efficiency – Load test - No load and blocked rotor tests - Circle diagram –
Separation of losses – Double cage induction motors –Induction generators – Synchronous
induction motor.
,• UNIT IV STARTING AND SPEED CONTROL OF THREE PHASE INDUCTION MOTOR
• Need for starting – Types of starters – DOL, Rotor resistance, Autotransformer
and Star-delta starters – Speed control – Voltage control, Frequency control and
pole changing – Cascaded connection-V/f control – Slip power recovery scheme-
Braking of three phase induction motor: Plugging, dynamic braking and
regenerative braking.
• UNIT V SINGLE PHASE INDUCTION MOTORS AND SPECIAL MACHINES
• Constructional details of single phase induction motor – Double field revolving
theory and operation – Equivalent circuit – No load and blocked rotor test –
Performance analysis – Starting methods of single-phase induction motors –
Capacitor-start capacitor run Induction motor- Shaded pole induction motor -
Linear induction motor – Repulsion motor - Hysteresis motor - AC series motor-
Servo motors- Stepper motors - introduction to magnetic levitation systems.
, • TEXT BOOKS:
• 1. A.E. Fitzgerald, Charles Kingsley, Stephen. D.Umans, ‘Electric
Machinery’, Tata
• Mc Graw Hill publishing Company Ltd, 2003.
• 2. D.P. Kothari and I.J. Nagrath, ‘Electric Machines’, Tata McGraw
Hill Publishing Company Ltd, 2002.
• 3. P.S. Bhimbhra, ‘Electrical Machinery’, Khanna Publishers, 2003.
• REFERENCES:
• 1. M.N.Bandyopadhyay, Electrical Machines Theory and Practice,
PHI Learning PVT LTD., New Delhi, 2009.
• 2. Charless A. Gross, “Electric /Machines, “CRC Press, 2010.
• 3. K. Murugesh Kumar, ‘Electric Machines’, Vikas Publishing
House Pvt. Ltd, 2002.
• 4. Syed A. Nasar, Electric Machines and Power Systems: Volume I,
Mcgraw -Hill College; International ed Edition, January 1995.
• 5. Alexander S. Langsdorf, Theory of Alternating-Current
Machinery, Tata McGraw Hill Publications, 2001.
, Syllabus
• UNIT I SYNCHRONOUS GENERATOR
• Constructional details – Types of rotors –winding factors- emf equation – Synchronous
reactance – Armature reaction – Phasor diagrams of non salient pole synchronous
generator connected to infinite bus--Synchronizing and parallel operation – Synchronizing
torque -Change of excitation and mechanical input- Voltage regulation – EMF, MMF, ZPF
and A.S.A methods – steady state power angle characteristics– Two reaction theory –slip
test -short circuit transients - Capability Curves
• UNIT II SYNCHRONOUS MOTOR
• Principle of operation – Torque equation – Operation on infinite bus bars - V and Inverted V
curves – Power input and power developed equations – Starting methods – Current loci for
constant power input, constant excitation and constant power developed-Hunting –
natural frequency of oscillations – damper windings- synchronous condenser.
• UNIT III THREE PHASE INDUCTION MOTOR
• Constructional details – Types of rotors –- Principle of operation – Slip –cogging and
crawling- Equivalent circuit – Torque-Slip characteristics - Condition for maximum torque –
Losses and efficiency – Load test - No load and blocked rotor tests - Circle diagram –
Separation of losses – Double cage induction motors –Induction generators – Synchronous
induction motor.
,• UNIT IV STARTING AND SPEED CONTROL OF THREE PHASE INDUCTION MOTOR
• Need for starting – Types of starters – DOL, Rotor resistance, Autotransformer
and Star-delta starters – Speed control – Voltage control, Frequency control and
pole changing – Cascaded connection-V/f control – Slip power recovery scheme-
Braking of three phase induction motor: Plugging, dynamic braking and
regenerative braking.
• UNIT V SINGLE PHASE INDUCTION MOTORS AND SPECIAL MACHINES
• Constructional details of single phase induction motor – Double field revolving
theory and operation – Equivalent circuit – No load and blocked rotor test –
Performance analysis – Starting methods of single-phase induction motors –
Capacitor-start capacitor run Induction motor- Shaded pole induction motor -
Linear induction motor – Repulsion motor - Hysteresis motor - AC series motor-
Servo motors- Stepper motors - introduction to magnetic levitation systems.
, • TEXT BOOKS:
• 1. A.E. Fitzgerald, Charles Kingsley, Stephen. D.Umans, ‘Electric
Machinery’, Tata
• Mc Graw Hill publishing Company Ltd, 2003.
• 2. D.P. Kothari and I.J. Nagrath, ‘Electric Machines’, Tata McGraw
Hill Publishing Company Ltd, 2002.
• 3. P.S. Bhimbhra, ‘Electrical Machinery’, Khanna Publishers, 2003.
• REFERENCES:
• 1. M.N.Bandyopadhyay, Electrical Machines Theory and Practice,
PHI Learning PVT LTD., New Delhi, 2009.
• 2. Charless A. Gross, “Electric /Machines, “CRC Press, 2010.
• 3. K. Murugesh Kumar, ‘Electric Machines’, Vikas Publishing
House Pvt. Ltd, 2002.
• 4. Syed A. Nasar, Electric Machines and Power Systems: Volume I,
Mcgraw -Hill College; International ed Edition, January 1995.
• 5. Alexander S. Langsdorf, Theory of Alternating-Current
Machinery, Tata McGraw Hill Publications, 2001.
