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TW 16

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Stator is equal to asynchronous motor stator. Rotating field is therefor the same ... Pull in torque: rotor synchronizes with stator field. TW17.4-7 Motor Under Load ... – PowerPoint PPT presentation

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Title: TW 16


1
TW 1617 Synchronous Machine
  • Construction
  • Principle
  • Characteristics
  • Selection criterias
  • Equivalent circuit
  • Calculation on the basis of equivalent circuit

2
TW16.0-16.6 Components
3
TW16.0-16.6 Components
4
TW16.0-16.6 Components
5
TW16.0-16.6 Components
6
TW16.0-16.6 Components
7
TW16.0-16.6 Components
8
TW16.0-16.6 Components
9
TW16.0-16.6 Components
10
TW16.0-16.6 Components
11
TW16.0-16.6 Components
12
TW16.0-16.6 Components
13
TW16.0-16.6 Components
14
TW16.7 Size Factors
  • Small machines lower efficiencies
  • Big machines better efficiencies
  • 1000MW generator almost 99!!!
  • Think again of magnetics and scale rules
  • Therefore rather one big machine than more
    smaller machines
  • 1 efficiency thousands of per day in power
    plant!!!

15
TW16.89 Principle
  • Synchronous machine is uncommutated dc machine
    inside out
  • Stator is equal to asynchronous motor stator
  • Rotating field is therefor the same
  • No slip, but elastic, magnetic coupling between
    rotor and revolving field

16
TW16.89 Principle
17
TW16.89 Principle
18
TW16.89 Principle
19
TW16.91011 Equivalent Circuit
20
TW16.91011 Equivalent Circuit
21
TW16.12-14 Machine under Load
22
TW16.12-14 Machine under Load
23
TW16.12-14 Machine under Load
24
TW16.12-14 Machine under Load
25
TW16.12-14 Machine under Load
26
TW16.15 Synchronization
  • 1) Generator frequency bus frequency
  • 2) Generator voltage bus voltage
  • 3) Phase generator phase bus
  • 4) Phase sequence generator phase
  • sequence bus

27
TW16.15 Synchronization
28
TW16.16-18 Infinite Bus
  • Infinite bus is a power supply where frequency
    and amplitude are constant under all load
    conditions
  • The public electricity grid is an infinite bus
    feeding power into it by an ac generator does not
    increase the frequency or voltage.

29
TW16.16-18 Infinite Bus
30
TW16.16-18 Infinite Bus
31
TW16.19 Torque Angle Torque
32
TW16.19 Torque Angle Torque
33
TW16.20 Active Power
34
TW16.23 Active Power
35
TW16.20 Active Power
36
TW16.21 Control Active Power
  • More power only more torque
  • More torque more fuel per cycle
  • Synchronous machine on infinite bus so no speed
    variations!
  • Speed variations only possible when machine in
    island mode

37
TW16.22 Transient Reactance
  • Sudden load changes give much lower synchronous
    reactance
  • Steady state has the usual reactance
  • Large machines need up to 10 secs to reach normal
    Xs after transients!
  • Good for voltage regulation at transients
  • Bad for circuit breakage high current

38
TW16.24 Machine Efficiency
  • Check Magnetics chapters again and the note about
    scaling laws!
  • The bigger the machines, the higher the
    efficiency.
  • 16.24 is an example of the explained scaling laws
    in the magnetics lectures.

39
TW17 Synchronous Motors
  • 17.0-17.1 Read

40
TW17.23 Motor Start Up
  • Squirrel cage winding
  • Start up with external motor
  • Pull in torque rotor synchronizes with stator
    field

41
TW17.4-7 Motor Under Load
42
TW17.4-7 Motor Under Load
43
TW17.4-7 Motor Under Load
44
TW17.4-7 Motor Under Load
45
TW17.8 Reluctance Torque
46
TW17.8 Reluctance Torque
47
TW17.8 Reluctance Torque
48
TW17.8 Reluctance Torque
49
TW17.8 Reluctance Torque
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