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Design of Electrical Machines

Subject Code: ee6604

UNIT I INTRODUCTION

1.      Major considerations in Electrical Machine Design – Ch 1

2.      Electrical Engineering Materials – Ch 2

3.      Space factor –

4.      Choice of Specific Electrical and Magnetic loadings – Ch 6.1.7,6.1.8

5.      Thermal considerations – Ch 4

6.      Heat flow – 4.1

7.      Temperature rise and Insulating Materials – 4.5 and 2.9

8.      Rating of machines – Ch 4.24

9.      Standard specifications – Ch 23

UNIT II DC MACHINES

10.  Output Equations and Main Dimensions – Ch 9.10

11.  Choice of Specific Electric and Magnetic Loading – CH 9.10.1 , 9.10.2

12.  Magnetic Circuits Calculations – Ch 3.4

13.  Carter’s Coefficient and Net length of Iron – Ch 3.4.2

14.  Real & Apparent flux densities – Ch 3.4.4

15.  Selection of number of poles – Ch 9.12

16.  Design of Armature – Ch 9.22 – 9.30

17.  Design of commutator and brushes – Ch 9.49 – 9.52

18.  Performance prediction using design values –

UNIT III TRANSFORMERS

19.  Output Equations and  Main Dimensions – Ch 5.29

20.  kVA output for single and three phase transformers – Ch  5.29

21.  Window space factor and Design of core and winding – Ch 5.41, 5.35, 5.38

22.  Overall dimensions – Ch 5.45

23.  Operating characteristics –

24.  No load current – Ch 5.52

25.  Temperature rise in Transformers – 5.54

26.  Design of Tank – 5.55

27.  Methods of cooling of Transformers – 5.56, 5.57

UNIT IV INDUCTION MOTORS

28.  Output equation of Induction motor and Main dimensions – 10.9, 10.13

29.  Choice of Average flux density and Length of air gap- 10.10, 10.21

30.  Rules for selecting rotor slots of squirrel cage machines – 10.22.1

31.  Design of rotor bars & slots – 10.23

32.  Design of end rings – 10.24

33.  Design of wound rotor – 10.26

34.  Magnetic leakage calculations and Leakage reactance of polyphase machines – 10.31.3

35.  Magnetizing current and Short circuit current – 10.30.1

36.  Operating characteristics and Losses and Efficiency. 10.37

UNIT V SYNCHRONOUS MACHINES

37.  Output equations and choice of Electrical and Magnetic Loading – 11.8

38.  Design of salient pole machines and Short circuit ratio – 11.9, 11.10

39.  Shape of pole face – 11.12

40.  Armature design and Armature parameters – 11.13, 11.19

41.  Estimation of air gap length – 11.20

42.  Design of rotor and damper winding – 11.21,11.21.2

43.  Determination of full load field mmf – 11.24

44.  Design of field winding – 11.24

45.  Design of turbo alternators and Rotor design –.11.30, 11.33

Book: Electrical Machine Design by A.K.Sawhney

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