Electrical Machines

An electrical machine is a device which converts mechanical energy into electrical energy or vice versa. Electrical machines also include transformers, which do not actually make conversion between mechanical and electrical form but they convert AC current from one voltage level to another voltage level.

This free application serves to both engineering students and professionals.

There are basically two types of electrical machines :

Transformers:
Transformers are used to transfer electrical energy from one circuit to another using magnetic flux. They do not contain any moving parts.
Motors and generators:
Motors convert electrical energy to mechanical energy and generators do the opposite. Motors and generators are again divided into AC and DC based on the type of the electrical energy they use or generate.
AC machines are again classified as synchronous machines if they maintain synchronous speed or induction machines if the rotors rotate at less than synchronous speed.

Some of the topics Covered in the app are:

1. Poly-phase AC Machines
2. Classification of A.C. Motors
3. Construction of A.C Motor
4. Phase-wound Rotor
5. Production of Rotating Field
6. Three-phase Supply
7. Relation Between Torque and Rotor Power Factor
8. Starting Torque of induction motor
9. Torque, Rotor E.M.F. and Reactance Under Running Conditions
10. Condition for Maximum Torque Under Running Conditions
11. Relation Between Torque and Slip
12. Full-load Torque, Starting torque and Maximum Torque
13. Torque/Speed Curve
14. Current/Speed Curve of an Induction Motor
15. Plugging of an Induction Motor
16. Complete Torque/Speed Curve of a Three-Phase Machine
17. Measurement of Slip
18. Power Stages in an Induction Motor
19. Torque, Mechanical Power and Rotor Output
20. Induction Motor Torque Equation
21. Analogy with a Mechanical Clutch and D.C. Motor
22. Sector Induction Motor
23. Magnetic Levitation
24. Induction Motor as a Generalized Transformer
25. Equivalent Circuit of the Rotor and Induction Motor
26. Power Balance Equations
27. Circle Diagram for a Series Circuit
28. Circle Diagram for the Approximate Equivalent Circuit
29. Determination of G0 and B0
30. Blocked Rotor Test
31. Construction of the Circle Diagram
32. Starting of Induction Motors
33. Starting of Slip-ring Motors
34. Starter Steps
35. Crawling and Cogging or Magnetic Locking
36. Double Squirrel Cage Motor
37. Speed Control of Induction Motors
38. Three-phase A.C. Commutator Motors
39. Three-phase A.C. Commutator Motors
40. Standard Types of Squirrel-cage Motors
41. Types of Single-Phase Motors
42. Single-phase Induction Motor
43. Double-field Revolving Theory
44. Making Single-phase Induction Motor Self-starting
45. Equivalent Circuit of a Single-phase Induction Motor Without Core Loss
46. Types of Capacitor - start Motors
47. Capacitor Start-and-Run Motor
48. Shaded-pole Single-phase Motor
49. Repulsion Type Motors
50. Repulsion Principle
51. Compensated Repulsion Motor
52. A.C. Series Motors
53. Universal Motor
54. Speed Control of Universal Motors
55. Unexcited Single-phase Synchronous Motors
56. Basic Principle and Stationary Armature of Alternator
57. Details of Construction
58. Damper Windings, Speed and Frequency
59. Armature Windings, Concentric or Chain Windings and Two-Layer Winding