Magnetic bearings and bearingless drives
The application of bearingless drives is emerging as an important technique in the areas of high-speed machinery and motion-control, and this book aims to provide a thorough grounding in the principles behind this cutting-edge technology. Basic principles are described in detail with practical examp...
| Otros Autores: | |
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| Formato: | Libro electrónico |
| Idioma: | Inglés |
| Publicado: |
Amsterdam ; London :
Elsevier/Newnes
2005.
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| Edición: | 1st edition |
| Materias: | |
| Ver en Biblioteca Universitat Ramon Llull: | https://discovery.url.edu/permalink/34CSUC_URL/1im36ta/alma991009627412806719 |
Tabla de Contenidos:
- Cover; Front matter; Half Title Page; Title Page; Copyright; Contents; List of Contributors; Foreword; Preface; Acknowledgements; 1. Introduction; 1.1 Magnetic bearing and motor drive; 1.2 Bearingless drives; 1.3 Definition and related technologies; 1.4 Early developments; 1.5 Bearingless structures; 1.6 Comparisons; 1.7 Winding structures; 1.8 Applications; References; 2. Electro-magnetics and mathematical model of magnetic bearings; 2.1 Electro-mechanical structure and operating principles; 2.2 Electric equivalent circuit and inductance; 2.3 Stored magnetic energy and force
- 2.4 Radial magnetic bearing 2.5 Unbalance pull force; 2.6 Block diagram and mechanical system; Reference; 3. Magnetic bearing controllers; 3.1 Design principles in one-axis magnetic suspension; 3.2 Adjustment of PID gains; 3.3 Interference in two perpendicular axes; 3.4 Unbalance force and elimination; 3.5 Eccentric displacement; 3.6 Synchronized displacement suppression; 4. Mechanical dynamics; 4.1 Two-axis system; 4.2 Four-axis and five-axis systems; 4.3 Thrust magnetic bearing and requirement of five-axis suspension; References; 5. Power electronic circuits for magnetic bearings
- 5.1 Structure and principles of power electronic circuits 5.2 PWM operation; 5.3 Current feedback; 5.4 Current driver operating area; 5.5 Power devices and gate drive circuits; 6. Primitive model and control strategy of bearingless motors; 6.1 Principles of radial force generation; 6.2 Two-pole bearingless motor; 6.3 MMF and permeance; 6.4 Magnetic potential and flux distribution; 6.5 Inductance matrix; 6.6 Radial force and current; 6.7 The dc excitation of the primitive bearingless motor; 6.8 AC excitation and revolving magnetic field; 6.9 Inductance measurements
- 7. Analysis in rotational coordinates and magnetic suspension strategy for bearingless drives with 2-pole and 4-pole windings 7.1 Vector control theory of electrical motors; 7.2 Coordinate transformation and torque regulation; 7.3 Vector control theory in bearingless motors; 7.4 Coordinate transformation from dc to ac bearingless machines; 7.5 System block diagrams of bearingless machines; References; 8. Field orientation, VA requirement and magnetic saturation; 8.1 Misalignment of field orientation; 8.2 VA requirement; 8.3 Magnetic saturation; References
- 9. Cylindrical permanent magnet synchronous bearingless motors 9.1 Structure of surface permanent magnet (SPM) rotor; 9.2 Radial suspension force and suspension winding current; 9.3 Equations of voltage and current; 9.4 Guideline for permanent magnet thickness and airgap length; 9.5 Irreversible permanent magnet demagnetization and MMF limitations of stator windings; 9.6 Control system configuration; References; 10. Inset types of permanent magnet bearingless motor; 10.1 Structure and features of an inset type of permanent magnet rotor; 10.2 Mutual interference between radial suspension forces
- 10.3 Rotor position control strategy
