book

Magnetic Bearings and Bearingless Drives

by Akira Chiba, Tadashi Fukao, Osamu Ichikawa, Masahide Oshima, Masatugu Takemoto, David G Dorrell

May 2005

Intermediate to advanced

400 pages

10h 23m

English

Newnes

Read now

Unlock full access

1.1 Magnetic bearing and motor drive1.2 Bearingless drives1.3 Definition and related technologies1.4 Early developments1.5 Bearingless structures1.6 Comparisons1.7 Winding structures1.8 Applications
2.1 Electro-mechanical structure and operating principles2.2 Electric equivalent circuit and inductance2.3 Stored magnetic energy and force2.4 Radial magnetic bearing2.5 Unbalance pull force2.6 Block diagram and mechanical system

3.1 Design principles in one-axis magnetic suspension3.2 Adjustment of PID gains3.3 Interference in two perpendicular axes3.4 Unbalance force and elimination3.5 Eccentric displacement3.6 Synchronized displacement suppression
4.1 Two-axis system4.2 Four-axis and five-axis systems4.3 Thrust magnetic bearing and requirement of five-axis suspension
5.1 Structure and principles of power electronic circuits5.2 PWM operation5.3 Current feedback5.4 Current driver operating area5.5 Power devices and gate drive circuits
6.1 Principles of radial force generation6.2 Two-pole bearingless motor6.3 MMF and permeance6.4 Magnetic potential and flux distribution6.5 Inductance matrix6.6 Radial force and current6.7 The dc excitation of the primitive bearingless motor6.8 AC excitation and revolving magnetic field6.9 Inductance measurements
7.1 Vector control theory of electrical motors7.2 Coordinate transformation and torque regulation7.3 Vector control theory in bearingless motors7.4 Coordinate transformation from dc to ac bearingless machines7.5 System block diagrams of bearingless machines
8.1 Misalignment of field orientation8.2 VA requirement8.3 Magnetic saturation
9.1 Structure of surface permanent magnet (SPM) rotor9.2 Radial suspension force and suspension winding current9.3 Equations of voltage and current9.4 Guideline for permanent magnet thickness and airgap length9.5 Irreversible permanent magnet demagnetization and MMF limitations of stator windings9.6 Control system configuration
10.1 Structure and features of an inset type of permanent magnet rotor10.2 Mutual interference between radial suspension forces10.3 Rotor position control strategy10.4 Identification of suspension force parameters
11.1 BPM rotor structures11.2 Suspension force for unity current and permanent magnet demagnetization11.3 Rotor position control strategy
12.1 Torque characteristics12.2 Radial force characteristics12.3 Drive systems
13.1 Rotor structure and suspension force13.2 Indirect type drives13.3 Direct type drives13.4 Two-pole motor drive
14.1 Structures and principles14.2 Number of poles14.3 Drive systems
15.1 Configuration of stator windings and principles of suspension force generation15.2 Derivation of inductances15.3 Assumption and calculation of permeances15.4 Theoretical formulae of suspension force and torque15.5 A drive system15.6 A feed-forward compensator for vibration reduction considering magnetic attraction force
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]
17.1 Mechanical structure17.2 Axial gap bearingless motors
18.1 Principles of displacement sensor18.2 Improvements in sensitivity18.3 Inductive and eddy current sensors18.4 Sensorless bearingless motor
19.1 Structure of digital controllers19.2 Discrete-time systems of PID controllers with the z-transform
20.1 An induction type bearingless motor [1–4]20.2 A permanent magnet type bearingless motor [5,6]
21.1 Canned pumps and drives [1–4]21.2 Compact pumps, bubble bed reactor21.3 Spindle motor and semiconductor processing