Electrical Machines free videos and free material uploaded by Gust M .
Syllabus / What will i learn?
Curriculum for this course
122 Lessons
00:00:00 Hours
Synchronous Generators
4 Lessons
- Synchronous Generators
- Types of Synchronous Machine
- Construction
- Salient Pole Rotor
Synchronous Machine Armature Windings
18 Lessons
- Winding Types
- Half-coil and whole-coil windings
- EMF of Fractional Pitch Windings
- Relation between Electrical and Mechanical Degrees of Rotation
- Distributed windings and distribution (or Belt) factor
- Integral Slot Winding
- Fractional Slot Winding
- Advantages of Fractional Slot Winding
- Harmonics
- Slot Harmonics
- Minimization Techniques of Harmonics
- Effect of Harmonics on induced emf
- Effect of Harmonics of pitch and distribution Factor
- Synchronous Reactance and Synchronous Impedance
- Phasor Diagram for Synchronous Motor
- Motoring operation at lagging power factor
- Motoring operation at unity power factor
- Motoring operation at leading power factor
REGULATION OF SYNCHRONOUS GENERATOR
14 Lessons
- Voltage Regulation
- EMF method
- Open Circuit Characteristic (O.C.C.)
- Short Circuit Characteristic (S.C.C.)
- Determination of synchronous impedance Z s
- MMF method
- ASA Modified MMF Method
- Zero Power Factor ( ZPF) method Potier Triangle Method
- Open Circuit Test
- Zero Power Factor Test
- Use of Potier Reactance to Determine Regulation
- Salient pole alternators and Blondel’s Two reaction Theory
- Power output of a Salient Pole Synchronous Machine
- Determination of Xd and Xq by slip test
PARALLEL OPERATION OF SYNCHRONOUS GENERATORS
9 Lessons
- Synchronizing of alternators
- Conditions required for Paralleling
- General Procedure for Paralleling Generators
- Synchronizing Current
- Effect of Change of Excitation
- Effect of Change of Input Torque
- Load Sharing
- Sharing of load when two alternators are in parallel
- Sharing of load when two alternators are in parallel
SYNCHRONOUS MOTORS
11 Lessons
- Principle of operation
- Methods of starting synchronous motor
- Equivalent circuit model and phasor diagram of a synchronous motor
- Effect of changes in load on, Ia, δ, and p. f. of synchronous motor
- Effect of changes in excitation on the performance synchronous motor
- V and inverted V curve of synchronous motor
- Experimental Setup to Obtain V-Curves
- Power Flow in Synchronous Motor
- Torque developed in Motor
- Hunting and Damper Winding Hunting
- Synchronous Condenser
SINGLE PHASE MOTORS & SPECIAL MACHINES
13 Lessons
- Introduction
- Single-phase Induction Motor
- Double field revolving theory
- Starting Of Single Phase Induction Motors
- Split-phase induction motor
- Capacitor starts induction motor
- Universal Motor
- Synchronous reluctance
- Switched reluctance
- Electronic driven variable reluctance motor
- Hysteresis motor
- Stepper motors
- Determination of Magnetic Force and Torque form Energy
PRINCIPLES OF ELECTROMECHANICAL ENERGY CONVERSION
6 Lessons
- Introduction
- Forces and Torques in Magnetic Field Systems
- The Energy Method
- Energy Balance
- Energy in Singly-Excited Magnetic Field Systems
- E.M.F. Commutation
D.C GENERATORS
18 Lessons
- DC Generator principle
- Construction of DC Generators
- Armature Windings
- The Wave Winding
- The general definition of emf
- Motional emf in the presence of a static magnetic field
- Emf due to a time-varying magnetic field
- Emf of a circuit containing a battery and a resistor
- Armature Reaction:
- Demagnetizing and Cross-Magnetizing Conductors
- Calculation of Demagnetizing Ampere-Turns Per Pole (ATd/Pole)
- Compensating Windings
- Methods of Improving Commutation
- Resistance Commutation
- Brush Shifting Method of Commutation
- Method Of Using Inter-Pole
- Compensating Windings
- Load characteristic of shunt generator
D.C GENERATORS – II
29 Lessons
- Excitation System
- Types of Excitation System
- DC Excitation System
- AC Excitation System
- Brushless Excitation System
- Static Excitation System
- Separately excited dc generator
- Self Excited dc generator
- Critical Field Resistance
- Practical Determination of RC
- Critical Speed
- Causes for Failure to Self Excite and Remedial Measures
- Characteristics of a shunt generator
- Compound generator
- Parallel Operation of D.C Series Generators
- TESTING OF DC MACHINES
- Calculation of efficiency
- Condition for maximum efficiency
- Maximum efficiency for motor mode
- Maximum efficiency for Generation mode
- Swinburne Test of DC Machine
- Advantages of Swinburne's Test
- Hokinson’s test
- Calculation of Efficiency by Hopkinson's Test
- Retardation Test in a D.C. Motor Test
- Procedure of Retardation Test on D.C Machines
- Determination of dN/dt in retardation test of dc machines
- ) Using Flywheel in retardation test
- Without using Flywheel in retardation test
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