EE6504 Electrical Machines II Syllabus Notes Question Papers Question Bank with answers download
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EE6504 Electrical Machines II Syllabus - EM 2 Syllabus
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 powerangle 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.
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