Basic Electrical Technology ( Three phase induction motor, D.C Machines , Measuring instruments ) module 8 , 9 and 10

• Module-8 Three phase induction motor
  • Lesson 29 Rotating Magnetic Field in Three-phase Induction Motor [ Three-phase Induction Motor ~ Rotating Magnetic Field ~ Four-Pole Stator ~ The Reversal of Direction of Rotating Magnetic Field ]
  • Lesson 30 Construction and Principle of Operation of IM [ Construction of Three-phase Induction Motor ~ Principle of Operation ~ The frequency of the induced emf and current in the rotor ]
  • Lesson 31 Equivalent Circuit and Power Flow Diagram of IM [ The induced emf per phase, in the motor windings ~ The equivalent circuit per phase, of the rotor ~ The relation between rotor input, rotor copper loss and rotor output ~ Power flow diagram ]
  • Lesson 32 Torque-Slip (speed) Characteristics of Induction Motor (IM) [ Gross Torque Developed ~ Torque-slip (speed) Characteristics ~ Starting Current and Torque ]
  • Lesson 33 Different Types of Starters for Induction Motor (IM) [ Direct-on-Line (DOL) Starters ~ Need for Starters in IM ~ Starters for Cage IM ~ Rotor Resistance Starters for Slip-ring (wound rotor) IM ]
  • Lesson 34 Starting Methods for Single-phase Induction Motor [ Single-phase Induction Motor ~ Double field revolving theory ~ Starting Methods ~ Resistance Split-phase Motor ~ Capacitor Split-phase Motor ~ Capacitor-start Motor ~ Capacitor-start and Capacitor-run Motor ~ Shaded-pole Motor ]
• Module-9 D.C Machines
  • Lesson 35 Constructional Features of D.C Machines [ Constructional Features ~ D.C machine Armature Winding ~ Armature winding: General procedure ~ Developed diagram ~ Lap winding ~ Another example of Lap winding ~ Wave winding ]
  • Lesson 36 Principle of Operation of D.C Machines [ Example of Single conductor Generator & Motor ~ Rotating Machines ~ Driving & Opposing torques ~ Generator mode ~ Motor mode ~ Condition for steady production of torque ~ D.C generator: Basic principle of operation ~ D.C motor: Basic principle of operation ]
  • Lesson 37 EMF & Torque Equation [ EMF & Torque Equations ~ EMF Equation ~ Torque Equation ~ GNP and MNP ~ Armature reaction ~ No Load operation ~ Loaded operation ~ Cross magnetizing & Demagnetizing AT ~ Commutation & Armature reaction ]
  • Lesson 38 D.C Generators [ Generator types & characteristics ~ Characteristics of a separately excited generator ~ Characteristics of a shunt generator ~ Load characteristic of shunt generator ~ Prediction of approximate load characteristic from OCC & Rf line ~ Compound generator ]
  • Lesson 39 D.C Motors [ Starting of D.C shunt motor ~ Problems of starting with full voltage ~ A simple starter ~ 3-point starter ~ Speed control of shunt motor ~ Speed control by varying armature resistance ~ Speed control by varying field current ~ Speed control by armature voltage variation ~ Ward Leonard method: combination of Va and If control ~ Series motor ~ Characteristics of series motor ~ Speed control of series motor ~ Speed control below base speed ~ Speed control above base speed ~ Braking of d.c shunt motor: basic idea ~ Rheostatic braking ~ Plugging or dynamic braking ~ Regenerative braking ]
  • Lesson 40 Losses, Efficiency and Testing of D.C. Machines [ Major losses ~ Swinburne's Test ~ Hopkinson's test ~ Procedure ~ Loading the machines ~ Calculation of efficiency ~ Condition for maximum efficiency ~ Maximum efficiency for motor mode ~ Maximum efficiency for General mode ]
  • Lesson 41 Problem Solving on D.C Machines [ Shunt motor problems ~ Problems on Series Motor ~ D.C generator problems ~ Operation of d.c machine connected to d.c bus (fixed d.c voltage) ]
• Module-10 Measuring instruments
  • Lesson 42 Study of DC-AC Measuring Instruments [ Various forces/torques required in measuring instruments ~ General Theory Permanent Magnet Moving Coil (PMMC) Instruments ~ A multi-range ammeters and voltmeters ~ Advantages, Limitations and sources of errors ~ Construction and Basic principle operation of Moving-iron Instruments ~ Construction of Moving-iron Instruments ~ Ranges of Ammeters and Voltmeters ]
  • Lesson 43 Study of Electro-Dynamic Type Instruments [ Operating Principle ~ More about ammeters ~ Ranges of Ammeters and Voltmeters ~ Connections for ammeter, voltmeter and wattmeter ~ Inductance of Voltage-Coil Introduces an Error in Wattmeter ~ Advantages and disadvantages of electro-dynamic instruments ]
  • Lesson 44 Study of Single Phase Induction Type Energy Meter or Watt-hour Meter [ Construction of induction type energy meter ~ Errors in the energy meter ~ Extension of Instrument Range ]
  
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