EE3405 Electrical machines 2
Important questions
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2.Power flow diagram,Torque equation *
1. Torque slip characteristics (IM),Speed torque (Double cage IM)**
3.Torque Equation**
Option in rare cases
3. Circle diagram (for slow bloomers this is not needed)
2.$haded pole ,AC series ,Reluctance motor
*Based on that topic problems may be asked
**Most important &probelms also asked for exams
**Very important questions are bolded and may be asked based on this topic
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*These questions are expected for the exams This may or may not be asked for exams All the best.... from admin Santhosh
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Constructional details – Types of rotors –winding factors- emf equation – Synchronous reactance – Armature reaction – Phasor diagrams of non salient pole synchronous generator conected to infinite bus-Synchronizing and paralel 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 ransients – Capabilty Curves
UNIT II SYNCHRONOUS MOTOR
Principle of operation – Torque equation – Operation on infinite bus bars – V and Inverted V curves – Power
UNIT III THREE PHASE INDUCTION MOTOR
Constructional details – Types of rotors –- Principle of operation – Slip –coging and crawling- Equivalent circuit – Torque-Slip characteristics – Conditon for maximum torque – Loses and eficiency – Load test – No load and blocked rotor tests – Circle diagram – Separation of loses – Double cage induction motors –Induction generators – Synchronous induction motor.
UNIT IV STARTING AND SPEED CONTROL OF THREE PHASE INDUCTION
MOTOR
Ned for starting – Types of starters – DOL, Rotor resistance, Autotransformer and Star- delta starters – Sped control – Voltage control, Frequency control and pole changing – Cascaded conection-V/f control – Slip power recovery scheme-Braking of thre phase
induction motor: Pluging, 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-Steper motors – introduction to magnetic levitation systems.
Constructional details – Types of rotors –winding factors- emf equation – Synchronous reactance – Armature reaction – Phasor diagrams of non salient pole synchronous generator conected to infinite bus-Synchronizing and paralel 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 ransients – Capabilty Curves
UNIT II SYNCHRONOUS MOTOR
Principle of operation – Torque equation – Operation on infinite bus bars – V and Inverted V curves – Power
UNIT III THREE PHASE INDUCTION MOTOR
Constructional details – Types of rotors –- Principle of operation – Slip –coging and crawling- Equivalent circuit – Torque-Slip characteristics – Conditon for maximum torque – Loses and eficiency – Load test – No load and blocked rotor tests – Circle diagram – Separation of loses – Double cage induction motors –Induction generators – Synchronous induction motor.
UNIT IV STARTING AND SPEED CONTROL OF THREE PHASE INDUCTION
MOTOR
Ned for starting – Types of starters – DOL, Rotor resistance, Autotransformer and Star- delta starters – Sped control – Voltage control, Frequency control and pole changing – Cascaded conection-V/f control – Slip power recovery scheme-Braking of thre phase
induction motor: Pluging, 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-Steper motors – introduction to magnetic levitation systems.