Dissertation > Excellent graduate degree dissertation topics show

Study on Control Strategy of Bearingless Induction Motors

Author: CaiGuoYang
Tutor: HuangShouDao
School: Hunan University
Course: Electrical Engineering
Keywords: bearingless induction motor air-gap flux orientation rotor flux orientation stator flux orientation mutual MRAS speed sensorless operation
CLC: TM343
Type: Master's thesis
Year: 2008
Downloads: 127
Quote: 2
Read: Download Dissertation

Abstract


The bearingless motor which combines magnetic levitation bearings with the drive windings is a new type of motors. In recent years the research on it has become a focus in the domain of the AC drive with high and ultra high speed for its potential value and complex operation control. It winds magnetic levitation bearings with the drive windings by taking advantages of the similarity between the structure of magnetic bearing and that of the AC motor. Its rotor can rotate and be suspended simultaneously by changing and controlling the magnetic field distribution purposefully. The bearingless induction motors which have the advantage of simple structure and high reliability have been studied earlier and more than other types of bearingless motors.In this dissertation, the mathematical models of the bearingless induction motor are derived based on the anlysis of its basic principle. The study above lays the theoretical foundation on its suspension operation control. Two kinds of high performance vector control strategy including motor winding air-gap flux orientation and motor winding rotor flux orientation of the bearingless induction motor are proposed by introducing the magnetic field oriented control technology. On the basis of the comparative theoretical analysis, the respective advantages and disadvantages of those above are claritied. The control system models of those above are established in MATLAB/SIMULINK and comparative simulations are made under a wide range of operation conditions. In this desseration, a nonlinear control strategy based on motor winding stator flux orientation of the bearingless induction motor is proposed for the first time. Adaptive flux observer is designed to observe stator flux. The needed motor winding air-gap flux in radial levitation controller is obtained by motor winding stator flux and stator current. The control system above is simulated under a wide range of operation conditions. The validity of proposed control strategy is proved by simulation results. The influence and compensation of levitation controlled coupling are also studied. At last, the control strategy based on mutual model reference adaptive system(MRAS) is proposed, which will meet the need of speed sensorless operation for the bearingless induction motors. The prototype is successfully levitated under the condition of heavy load dirturbance and can be operated stable as well as transient conditions.

Related Dissertations

  1. Study of Low Speed Control Strategy on Induction Motor Speed Sensorless,TM343
  2. Research of Speed Sensorless Vector Control System Based on Stator Flux-oriented,TP212
  3. Wind Power Generation System Fuzzy Control Technology,TM614
  4. Design of a 5-degree Bearingless Induction Motor and Control System,TM343
  5. Research for Suspension Control of Bearingless Induction Motors,TM343
  6. Study on Decoupling Control of Bearingless Induction Motor Based on Inverse System Method,TM343
  7. Research on Stator Flux-Orientation Control for Bearingless Induction Motor Based on Speed Sensorless,TM343
  8. Research on Speed Sensorless Technology for Bearingless Induction Motor,TM343
  9. Research on Nonlinear Decoupling Control of the Bearingless Induction Motors,TM343
  10. Double- fed wind generator excitation control strategy,TM315
  11. Control System of Bearingless Induction Motor,TM343
  12. Direct Torque Control for Bearingless Induction Motor Based on DSVM,TM343
  13. Study on Direct Torque Control System Using Space Vector Modulation for Bearingless Induction Motor Based on Active Disturbance Rejection Controller,TM343
  14. Based on TMS320F2812 SVPWM vector control technology with electric actuator research,TP273
  15. The Research on Control System of Variable-Speed Constant-Frequency Wind Power Conversion Using Doubly Fed Generator,TM921.5
  16. Study and Implementation of Speed-sensorless Direct Torque Control Strategy Based on DSP,TM921.5
  17. Research on Flux-Weakening Control for Permanent Magnent Synchronous Motor Drive,TM921.5
  18. The Designing and the Researchment on Doubly-fed Wind Generation Control System Based with the Miscroprocessor,TM614
  19. Nonlinear Decoupling and Experiment for Bearingless Induction Motors,TM343
  20. Research on Speed Sensorless Technology for Bearingless Induction Motor,TM343

CLC: > Industrial Technology > Electrotechnical > Motor > AC motor > Induction motor
© 2012 www.DissertationTopic.Net  Mobile