Linear Synchronous Motors Transportation And Automation Systems

✍ Scribed by Jacek F. Gieras, Zbigniew J. Piech, Bronislaw Tomczuk

• Publisher: CRC Press
• Year: 1999
• Tongue: English
• Leaves: 270
• Series: Electric Power Engineering Series
• Edition: 1
• Category: Library

✦ Synopsis

Contrary to some opinions, electric motors are decidedly not part of an old-fashioned area of research. They are, in fact, the most popular machines of everyday life, and the number of types increase almost every year. Advances in materials engineering, power electronics, and control strategies along with energy and reliability demands continue to stimulate the development of exciting new technologies and applications. Ranking high among the most exciting of these technologies are linear synchronous motors (LSMs). Linear Synchronous Motors: Transportation and Automation Systems provides a comprehensive treatment of all types of brushless LSMs-their construction, electromagnetic effects, control, and applications. It explains the physics of hard magnetic materials, discusses permanent magnet and superconducting excitation systems, and addresses applications in factory automation and high-speed transportation systems.LSMs have better performance and higher power density than their induction counterparts, and they can operate with a larger mechanical clearance between their stationary and moving parts. Paying equal attention to the design and the applications of LSMs, Linear Synchronous Motors offers a unique opportunity to master the inner workings of LSMs, discover new research results, and keep abreast of their emerging applications. Electromechanical designers, electrical and mechanical engineers, as well as linear motor enthusiasts will welcome this broad and authoritative work to their reference collections.

✦ Table of Contents

Linear Synchronous Motors: Transportation and Automation System......Page 1
Table of Contents......Page 3
Preface......Page 7
1.1 Definitions, Geometry and Thrust Generation......Page 8
Table of Contents......Page 0
1.2 Linear Synchronous Motor Topologies......Page 11
1.2.1 Permanent Magnet Motors with Active Reaction Rail......Page 12
1.2.2 PM Motors with Passive Reaction Rail......Page 18
1.2.3 Motors with Electromagnetic Excitation......Page 19
1.2.5 Variable Reluctance Motors......Page 21
1.2.6 Stepping Motors......Page 22
1.2.7 Switched Reluctance Motors......Page 25
1.3 Calculation of Forces......Page 26
1.4.1 Speed-Time Curve......Page 27
1.4.3 Dynamics......Page 29
1.4.4 Traction......Page 31
1.5 Selection of Linear Motors......Page 33
2.2 Laminated Ferromagnetic Cores......Page 41
2.2.1 Electrotechnical Sheet-steels......Page 43
2.2.3 Permalloys......Page 44
2.2.4 Amorphous Materials......Page 45
2.2.6 Soft Magnetic Powder Composites......Page 46
2.3.1 Demagnetization Curve......Page 47
2.3.2 Magnetic Parameters......Page 49
2.3.3 Magnetic Flux Density in the Air gap......Page 51
2.3.4 Properties of Permanent Magnets......Page 52
2.4 Conductors......Page 55
2.5 Principles of Superconductivity......Page 56
2.6 Laminated Stacks......Page 58
2.7 Armature Windings of Slotted Cores......Page 61
2.8 Slotless Armature Systems......Page 65
2.9 Electromagnetic Excitation Systems......Page 68
2.11 Superconducting Excitation Systems......Page 69
2.12 Hybrid Linear Stepping Motors......Page 71
3.1.1 Magnetic Field of the Armature Winding......Page 73
3.1.2 Form Factors and Reaction Factors......Page 74
3.1.3 Synchronous Reactance......Page 76
3.1.4 Voltage Induced......Page 77
3.1.5 Electromagnetic Power and Thrust......Page 78
3.1.6 Thrust Ripple......Page 80
3.1.7 Direct Calculation of Thrust......Page 86
3.2 Motors with Superconducting Excitation Coils......Page 89
3.4.1 Finite Element Approach......Page 93
3.4.2 Reluctance Network Approach......Page 94
3.4.3 Experimental Investigation......Page 99
3.5 Switched Reluctance Motors......Page 105
4.1 Control of a.c. Motors......Page 107
4.2.1 Sine-Wave Motors......Page 108
4.2.2 Square Wave (Trapezoidal) Motors......Page 110
4.3 Dynamic Model of a PM Motor......Page 111
4.4 Thrust and Speed Control of PM Motors......Page 114
4.4.1 Open Loop Control......Page 115
4.4.2 Closed Loop Control......Page 116
4.4.4 Flux-Weakening Control......Page 117
4.4.5 Direct Thrust Control......Page 118
4.5.1 Microstepping......Page 120
4.5.2 Electronic Controllers......Page 122
4.6 Precision Linear Positioning......Page 123
5.1.1 Incremental Encoders......Page 130
5.1.2 Absolute Encoders.......Page 144
5.2.1 Construction......Page 147
5.2.2 Noise Cancellation......Page 149
5.2.3 Signal Interpolation Process......Page 150
5.2.4 Transmission of Speed and Position Signals......Page 152
6.1 Electromagnetic and Electrodynamic Levitation......Page 155
6.2.2 Propulsion, Support and Guidance......Page 157
6.2.3 Guideway......Page 160
6.2.5 Vehicle......Page 162
6.2.6 Control System of Electromagnets......Page 163
6.2.7 The Future of Transrapid System......Page 165
6.2.8 History of Transrapid Maglev System in Germany......Page 166
6.3.2 Location of Yamanashi Maglev Test Line......Page 168
6.3.4 Guideway......Page 171
6.3.5 Vehicle......Page 174
6.3.6 Superconducting Electromagnet......Page 176
6.3.7 Power Conversion Substation......Page 177
6.3.9 Boarding System......Page 179
6.3.10 Control System......Page 180
6.3.13 History of Superconducting Maglev Transportation Technology in Japan......Page 182
6.4.1 Assumptions......Page 183
6.4.2 Pilot Project......Page 184
6.5 Marine Express......Page 187
7.1.1 Linear Motor Driven Elevator Cars......Page 189
7.1.2 Elevator with Linear Motor in the Pit......Page 191
7.1.3 Linear Motor in Counterweight......Page 192
7.1.4 Conventional versus Linear Motor Driven Elevator......Page 194
7.2.1 Vertical transport in Ultra-High Buildings......Page 195
7.3 Assessment of Hoist Performance......Page 197
7.3.1 Construction of Ropeless Elevators......Page 198
7.3.2 Operation......Page 199
7.3.3 First Prototypes......Page 209
7.3.4 Brakes......Page 212
7.4.1 Guidelines for Installation......Page 214
7.4.2 Construction......Page 215
7.4.3 Applications......Page 216
8.1 Automation of Manufacturing Processes......Page 217
8.2.1 Metal Casting Machines......Page 218
8.2.2 2D Orientation of Plastic Films......Page 219
8.3 Machining Processes......Page 220
8.4.1 Friction Welding......Page 226
8.5.1 Electrocoating......Page 227
8.5.2 Laser Scribing Systems......Page 228
8.6.1 Monorail Material Handling System......Page 229
8.6.3 Capsule Filling Machine......Page 230
8.7.2 Generator of Vibration......Page 232
8.8 Industrial Laser Applications......Page 233
A.1 Approximation of Demagnetization Curve and Recoil Line......Page 234
A.2.1 Construction of the Operating Diagram......Page 235
A.2.2 Magnetization without Armature......Page 238
A.2.3 Magnetization with Armature......Page 239
A.2.4 Equivalent Magnetic Circuit......Page 241
B.1 Field Plotting......Page 243
B.2 Dividing the Magnetic Field into Simple Solids......Page 246
B.3 Prisms and Cylinders Located in an Open Space......Page 251
Appendix C: Calculations for PM LSMs......Page 252
Symbols and Abbreviations......Page 259
Abbreviations......Page 262
References......Page 264

✦ Subjects

Топливно-энергетический комплекс;Электрические машины;