UID:
almahu_9948025417102882
Umfang:
1 online resource (400 p.)
Ausgabe:
1st edition
ISBN:
1-281-00902-4
,
9786611009021
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0-08-047897-2
Inhalt:
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 examples to aid understanding, and the different types of bearingless drives are introduced, along with coverage of test machines and applications.Aimed at practising electrical and mechanical engineers and advanced students, Magnetic Bearings and Bearingless Drives provides an essential g
Anmerkung:
Description based upon print version of record.
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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
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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
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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
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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
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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
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10.3 Rotor position control strategy
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English
Weitere Ausg.:
ISBN 0-7506-5727-8
Sprache:
Englisch
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