1 electric machinery chapter 1 introduction to machinery principles edit by chi-shan yu
TRANSCRIPT
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1Electric Machinery
Chapter 1Introduction to Machinery
Principles
Edit by Chi-Shan Yu
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3Electric Machinery
Text book and supplementary materials of this course
• Stephen J. Chapman• , PH PTR , 5th edition
(Feb. 18, 2011), 東華書局代理
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4Electric Machinery
Reference book
• A. E. Fitzgerald, Electric Machinery, McGraw-Hill , 6th edition (July 25, 2002)
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5Electric Machinery
Electric Machinery
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6Electric Machinery
Introduction to Electric machinery Fundamental
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7Electric Machinery
Introduction to Electric machinery Fundamental
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8Electric Machinery
What to learn in this course ?
• Energy Conversion schemes are the key ideas introduced in this course
• Which types of energy conversion are concerned?• Electric energy to electric energy
– Transformer
• Electric energy to mechanical energy– Motor
• Mechanical energy to electric energy– Generator
• Magnetic energy is essential !
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9Electric Machinery
Course Outlines - Overview of relative electromagnetic theories
(3wks)
• Magnetic field: Ampere’s law• Magnetic flux: magnetic material, hysteresis
characteristics• Transformer: Faraday’s law, Len’s law
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10Electric Machinery
Course Outlines - Overview of relative electromagnetic theories
(conti)
• Magnetic circuit• Motor/generator: Induced voltage, induced
force
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11Electric Machinery
Course Outlines - Transformer (3wks)
• Ideal/non-ideal transformer• Equivalent transformer circuit• Voltage regulation, efficiency
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12Electric Machinery
Course Outlines - Basic electric machine (motor/generator) theories
(3wks)
• AC machine : induction machine, synchronous machine
• DC machine : separated excited, shunt excited, series excited, compound excited
• How the motor rotates ?– Torque/speed
• How the generator to build output voltage ?– Voltage/current
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13Electric Machinery
Course Outline - induction (asynchronous) machine (3wks)
• Induction motor (IM) – the most widely used ac motor in the world– Structure and operation theories of IM– Equivalent circuit of IM– Torque/speed characteristics– Basic motor control
• Induction generator (seldom used)– Output voltage control– Voltage/current characteristics
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14Electric Machinery
Course Outline - synchronous machine (3wks)
• Synchronous generator (SG) – the most widely used generator in the world– Structure and operation theories of SG– Equivalent circuit of SG– Voltage/current characteristics– Parallel operation
• Synchronous motor– Operation principles– Starting of synchronous motor– Torque/speed characteristics
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15Electric Machinery
History of Electric Machinery
1882Thomas A. Edison opens Pearl St. Station, NYC
DC generator, driven by steam engines
Waterwheel-driven DC generator installed in Appleton, Wisconsin
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16Electric Machinery
History of Electric Machinery
1884Frank J. Sprague
produces DC motor for Edison systems
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17Electric Machinery
History of Electric Machinery
1885William Stanley
develops commercially practical transformer
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18Electric Machinery
History of Electric Machinery
1888
Nikola Tesla presents paper on two-phase ac
induction and synchronous motors
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19Electric Machinery
Today’s development
• DC Machine– Motor– Generator
• Transformer– Single phase– Three phases
• AC Machine– Synchronous machine – motor, generator– Asynchronous machine (induction machine) – motor,
generator
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20Electric Machinery
Today’s development and future trends
• Micro-step stepping motor• Permanent magnet synchronous motor
(PMSM)– Brushless dc motor (BLDCM)
• Linear motor• Reluctance motor
– Synchronous reluctance– Switched reluctance
• Ultrasonic motor• Bionic robotics• MEMS motor
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21Electric Machinery
Course relation
• 碩 /博班入學與高考科目• It is the fundamental course of the electrical
engineering• Future courses
– Power electronics– Motor control– Electric motor drive– Power systems– Renewable energy– Electrical vehicle
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22Electric Machinery
Chapter 1. Introduction to machinery principles
1. Rotation motion, Newton’s law and power relationships
2. The magnetic field3. Faraday’s law4. Produce an induced force on a wire5. Produce an induced voltage on a conductor6. Linear dc machine examples7. Real, reactive and apparatus power in AC
circuits
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23Electric Machinery
Rotation motion, Newton’s law and power relationships
• Clockwise (CW) and Counterclockwise (CCW)– CCW is assumed as the positive direction, CW is
assumed as the negative direction.
• Linear and rotation motion– Position and angular (meter) (degree or radian)– Speed and angular speed
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24Electric Machinery
Rotation motion, Newton’s law and power relationships
– relationships
– Acceleration and angular acceleration
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25Electric Machinery
Torque
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26Electric Machinery
Torque
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27Electric Machinery
Newton’s law of rotation
1. Force
2. Torque
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28Electric Machinery
Torque and Work
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29Electric Machinery
Power (rate of doing work)
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30Electric Machinery
Conversion between watts and horsepower
1. Watts and horsepower
2. Conversion between two units5252 / 7.04 = 746.021hp = 746W = 0.746kW
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31Electric Machinery
The magnetic field
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32Electric Machinery
Produce a magnetic field – Ampere’s law
1. The magnetic field is produced by ampere’s law
2. The core is a ferromagnetic material
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33Electric Machinery
From the magnetic field to magnetic flux density
1. When the magnetic field is applied on a ferromagnetic material, the magnetic flux density B will be produced
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34Electric Machinery
Magnetic flux density and magnetic flux
1. Magnetic flux density
2. Magnetic flux
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35Electric Machinery
Magnetic Circuit – magnetomotive force
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36Electric Machinery
Magnetic circuit
1. Magnetic circuit
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37Electric Machinery
Electric circuit and magnetic circuit
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38Electric Machinery
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39Electric Machinery
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40Electric Machinery
Reluctance in magnetic circuit
1. Series connection
2. Parallel connection
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41Electric Machinery
The errors in magnetic circuit computation
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42Electric Machinery
The errors in magnetic circuit computation
4. Air gap “fringing effect”
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43Electric Machinery
Example 1-1
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50Electric Machinery
Magnetic circuit
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51Electric Machinery
MATLAB Programs
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52Electric Machinery
Example 1-2
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53Electric Machinery
Example 1-2
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60Electric Machinery
Example 1-3
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69Electric Machinery
Magnetic behavior of ferromagnetic material - Saturation
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70Electric Machinery
Magnetic curve for a typical steel
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71Electric Machinery
A plot of relative permeability r
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72Electric Machinery
Example 1-4
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73Electric Machinery
Example 1-5
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76Electric Machinery
Energy loss in ferromagnetic core – hysteresis loss
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77Electric Machinery
Hysteresis loop – residual flux
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78Electric Machinery
The effect of magnetomotive force on the hysteresis loop
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79
Magnetization curve
Electric Machinery
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80Electric Machinery
Hysteresis loss
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81Electric Machinery
Hysteresis loss
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82Electric Machinery
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83Electric Machinery
Faraday’s law – induce voltage from a time-varying magnetic field
1. Induced voltage magnitude and polarity
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84Electric Machinery
The induced voltage polarity – Lenz’s law
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85Electric Machinery
Flux and flux linkage
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86Electric Machinery
Example 1-6
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89Electric Machinery
Produce an induced force on a wire
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90Electric Machinery
Example 1-7
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91Electric Machinery
Example 1-7
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92Electric Machinery
Relationship between electric-magnetic variables
• Magnetic field: Ampere’s law• Magnetic flux: magnetic material, hysteresis
characteristics• Transformer: Faraday’s law, Len’s law
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93Electric Machinery
Induced voltage on a conductor
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94Electric Machinery
Example 1-8
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96Electric Machinery
Example 1-9
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98Electric Machinery
The linear DC machine – a simple example
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101Electric Machinery
Starting a linear DC machine
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102Electric Machinery
Starting a linear DC machine
1. Current
2. Induced force
3. Induced voltage
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103Electric Machinery
Starting a linear DC machine
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104Electric Machinery
Summarize of a dc machine starting
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105Electric Machinery
DC linear machine operates at no-load condition
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106Electric Machinery
Linear dc motor
• While the load is applied
• The conversion power between mechanical and electrical
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107Electric Machinery
Summarize of a dc motor operation
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108Electric Machinery
Linear dc generator
• While the external force is applied on the moving direction
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109Electric Machinery
Summarize of a dc generator operation
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110Electric Machinery
Starting problem of dc linear machine
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111Electric Machinery
Example 1-10
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112Electric Machinery
Example 1-10
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117Electric Machinery
Matlab/Simulink simulation
• Equations:– F = ilB– e = vBl– i = (Vb-e) / R– dv/dt = (F-Fload)/m
• Simulation parameters:– Vb=120V, R=0.3, l = 1m– B=0.6T, m=0.1kg– Fload=10(u-1)-20(u-2) nt
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118Electric Machinery
Matlab/Simulink simulation
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120Electric Machinery
Real, reactive and apparatus power in AC circuits
• Power in DC circuit
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121Electric Machinery
Real, reactive and apparatus power in AC circuits
• AC source applies power to an impedance Z
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122Electric Machinery
Instantaneous power
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123Electric Machinery
Instantaneous power
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124Electric Machinery
Average power and reactive power
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125Electric Machinery
Reactive power Q and apparatus power S
1. Reactive power Q (var) is defined from instantaneous power
2. Apparatus power S (VA) is defined to represent the product of voltage and current magnitudes
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127Electric Machinery
Complex power representation
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128Electric Machinery
Complex power representation
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129Electric Machinery
Power direction
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130Electric Machinery
Power factor
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131Electric Machinery
Example 1-11
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134Electric Machinery
Three phase concepts
• The three phase concepts are also introduced in Appendix