Cover -- Frontmatter -- 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 -- 10.4 Identification of suspension force parameters -- References -- 11. Buried permanent magnet bearingless motors -- 11.1 BPM rotor structures -- 11.2 Suspension force for unity current and permanent magnet demagnetization -- 11.3 Rotor position control strategy -- References -- 12. Synchronous reluctance bearingless motors -- 12.1 Torque characteristics -- 12.2 Radial force characteristics -- 12.3 Drive systems -- References -- 13. Bearingless induction motors -- 13.1 Rotor structure and suspension force -- 13.2 Indirect type drives -- 13.3 Direct type drives -- 13.4 Two-pole motor drive -- References.

14. Homopolar, hybrid and consequent-pole bearingless motors -- 14.1 Structures and principles -- 14.2 Number of poles -- 14.3 Drive systems -- References -- 15. Switched reluctance bearingless motors -- 15.1 Configuration of stator windings and principles of suspension force generation -- 15.2 Derivation of inductances -- 15.3 Assumption and calculation of permeances -- 15.4 Theoretical formulae of suspension force and torque -- 15.5 A drive system -- 15.6 A feed-forward compensator for vibration reduction considering magnetic attraction force -- References -- 16. Winding arrangement variations -- 16.1 Modified radial magnetic bearings [1,2] -- 16.2 Modified motors [3-5] -- 16.3 p-Pole and (p ± 2)-pole windings [9-11] -- References -- 17. Mechanical structure and position regulation -- 17.1 Mechanical structure -- 17.2 Axial gap bearingless motors -- References -- 18. Displacement sensors and sensorless operation -- 18.1 Principles of displacement sensor -- 18.2 Improvements in sensitivity -- 18.3 Inductive and eddy current sensors -- 18.4 Sensorless bearingless motor -- References -- 19. Controllers and power electronics -- 19.1 Structure of digital controllers -- 19.2 Discrete-time systems of PID controllers with the z-transform -- 20. Design procedure and examples -- 20.1 An induction type bearingless motor [1-4] -- 20.2 A permanent magnet type bearingless motor [5,6] -- References -- 21. Applications and test machines -- 21.1 Canned pumps and drives [1-4] -- 21.2 Compact pumps, bubble bed reactor -- 21.3 Spindle motor and semiconductor processing -- References -- Index.