Teaching Scheme (in Hours)
| Theory |
Tutorial |
Practical |
Total |
| 3 |
0 |
2 |
5 |
Subject Credit : 5
Examination Scheme (in Marks)
Theory
ESE (E)
|
Theory
PA (M)
|
Practical
ESE Viva (V)
|
Practical
PA (I)
|
Total
|
| 70 |
30 |
30 |
20 |
150 |
Syllabus Content
Unit-1: DESIGN OF THREE PHASE INDUCTION MOTOR:
MAIN DIMENSIONS:
Output equation, choice of specific loadings, separation of D and L.
STATOR DESIGN:
Stator winding design, Calculation of no. of turns per phase, Conductor’s area, Shape of the stator slots, Area of stator slots, Stator teeth design, Depth of the stator core, Length of air gap, Numerical problems related to above topics.
ROTOR DESIGN:
A. Squirrel cage rotor – Selection of no. of rotor slots, Effect of harmonics and choice of rotor slots to minimize harmonics, vibration, noise and voltage ripples, Rules for selecting no. of rotor slots, Methods for reducing harmonic torque, Design of rotor bars and rotor slots. Design of end rings and rotor core.
B. Wound rotor - Calculation of number of rotor slots, Number of turns, Cross sectional area of rotor conductors, Types of rotor windings, Check for rotor tooth density, Design of rotor slot and rotor core.
PERFORMANCE PARAMETERS EVALUATION:
No load current calculation, Stator and rotor resistance and reactanc
Unit-2: DESIGN OF SINGLE PHASE INDUCTION MOTOR:
Design of main dimensions, Design of stator, Design of rotor, Design of auxiliary winding.
PERFORMANCE PARAMETERS EVALUATION:
Rotor resistance, Stator resistance, Iron loss, Friction and Windage loss, Starting torque, Circle diagram, Calculation of capacitance for maximum torque.
Unit-3: DESIGN OF SYNCHRONOUS MACHINE:
Output equation and design of main dimensions, Short Circuit Ratio (SCR) and its significance, Length of air gap and shape of pole face.
ARMATURE DESIGN:
Armature winding (Single layer and double layer), Number of armature slots, Slot dimensions, Length of mean turn, Calculation of armature resistance and reactance.
DESIGN OF FIELD SYSTEM:
Design of magnetic circuit, Open circuit characteristic, Determination of full load field MMF, Design of field winding, Determination of direct and quadrature axis synchronous reactance, Short circuit characteristics.
DESIGN OF TURBO ALTERNATORS: Main dimensions, Length of air gap, Stator & Rotor design. Design considerations for low speed alternators and vertically operated alternator. Computer programs and flow charts based on above topics.
Unit-4: APPLICATION OF FINITE ELEMENT METHOD IN DESIGN:
Introduction to FEM, Application of FEM technique for design problems. Use of open source FEM software for 2D design. Computation of performance parameters of machine using FEM software.
Reference Books
| Sr. |
Title |
Author |
Publication |
Amazon Link |
| 1 |
A Course in electrical machine design |
A. K. Sawhney |
Dhanpat Rai and Sons |
|
| 2 |
Electrical Machine Design |
R. K. Agrawal |
S.K. Kataria & Sons |
|
| 3 |
Design of Electrical machines |
V. N. Mittle |
Standard Publishers Distributors |
|
| 4 |
Design and Testing of Electrical Machines |
M V Deshpande |
PHI |
|
| 5 |
Electrical Machine Analysis using Finite Elements |
Nicola Bianchi, Taylor and Francis |
Taylorandfrancis |
|
Course Outcome
- Design the Induction and Synchronous machines of given specifications.
- Prepare the detailed sketches of the designed machine.
- Use computer for electrical machine design
