Dissertation > Excellent graduate degree dissertation topics show

Finite Element Analysis and Control of Interior Composite-Rotor Controllable-Flux Permanent Magnet Synchronous Machine

Author: ZhongWeiGang
Tutor: ChenYiGuang
School: Tianjin University
Course: Motor and electrical
Keywords: Interior composite-rotor Controllable-flux Permanent magnet synchronous machine Finite element analysis
CLC: TM341
Type: Master's thesis
Year: 2008
Downloads: 147
Quote: 3
Read: Download Dissertation


It is difficult to adjust the permanent magnetic flux which leads to the hardness of rising speed above rated value by PM-flux weakening in traditional PMSM. Many kinds of PMSM structure have been proposed to increase the PM-flux weakening range, and one of them is Ostovic’s variable-flux PMSM (memory motor). But the memory motor still has shortcomings. Its sandwich-shaped rotor structure leads to the low percentage of pole embrace and poor mechanical robustness. And AlNiCo is costly compared to NdFeB which has high Br and Hc. The controllable-flux PMSM proposed in this paper makes full use of the high remanent flux density, high coercive force of NdFeB, and the high remanent flux density, low coercive force of AlNiCo. The size and placement of PMs were elaborately designed to guarantee the cooperation of the two PMs on magnetic performance. The speed is regulated by using the PM-flux weakening in a wide speed range while maintaining the basic electrical properties of motors.The vector control strategy is applied to the system, which means the d-axis current id=0 and then the armature current equals to q-axis current iq. The direction of q-axis armature reaction MMF(magnetic motive force) is orthogonal to the magnetization direction of AlNiCo and have little impact on its magnetization status. By imposing a d-axis current pulse whose direction and amplitude can be changed in the stator windings, the closed-loop speed control system can change the magnetization direction and remnant flux density of AlNiCo, and control the air-gap PM-flux ultimately. When AlNiCo has the same magnetization direction with NdFeB, it contributes little to the air-gap PM-flux, but force the flux contributed by NdFeB to stator windings to make the strongest air-gap flux. When they have opposite magnetization direction, AlNiCo can make a part shunt circuit of the flux contributed by NdFeB in the rotor and weaken the air-gap flux.A series of motor models with different PM width were set up on the basis of finite element analysis to get the interior distribution of magnetic field and gap-flux density in different working conditions. The impact of load current on d-axis PM magnetic field and gap-flux harmonic component were both analyzed to get the rule how the magnet size influences the multiple of flux weakening. And for the 6-pole controllable-flux PMSM, air-gap magnetic field waveforms in different motor conditions were demonstrated to show the necessity of increasing q-axis magnetic reluctance.For the characteristics of that the interior composite-rotor controllable-flux PMSM needs id to change its gap-flux, a control strategy was designed. And on the basis of the control strategy for the controllable-flux PMSM, a sound control system was designed.

Related Dissertations

  1. Research on the Mainframe System of Powder Mixed EDM and the Craft Experiment,TG661
  2. EDM Electrode Wear Mechanism and Control Research,TG661
  3. Finite Element Analysis and Structure Optimal Design for Combined Seal at Normal Temperature and Low Temperature,TH136
  4. Simulation Research on Compound-Structure Permanent-Magnet Synchronous Machine System Used in Hybrid Electric Vehicles,TM341
  5. Research on an Axial/Radial-Axial Flux Compound-Structure Permanent-Magnet Synchronous Machine Used for Hybrid Electric Vehicle,TM341
  6. Study on the Design and Biomechanical Behaviors of Individualized Artificial Knee Joint,R318.1
  7. Design of Testing Equipment for Electronic Products,TN06
  8. Multi-pin Internal Fixation of Calcaneal Fractures in Finite Element Analysis,R687.3
  9. Airborne radar antenna pedestal rapid design systems research and development,TN959.73
  10. Sham hose drum drive means and hydraulic system of the structure,TE973
  11. The magnetorheological damper mechanical properties and Gun Recoil,TB535.1
  12. Nonlinear Structural Dynamics Analysis and Optimization Design on Naval Gun Driver,TJ391
  13. Design and Analysis of Automatic Steel Pipes Butt Tool,U673.38
  14. Analysis on Unloading of Large Span Steel Structures and Research on Its Mechanical Analysis,TU391
  15. Simulation of the Clinching Process Using FEA Method with Steel and Aluminum Alloy Sheets for Automotive Sunroof Frame,U463.83
  16. M1 of CRH2-300 Train Finite Element Analysis and Travelling Comfort,U266
  17. The Design of Telescopic Asphalt Spraying System,U415.524
  18. Development of Post-process System in Sheet Metal Simulation Based on SolidWorks,TP391.72
  19. Failure Analysis and Structural Optimization of the Typical Fine Blanking Punch,TG385.2
  20. The Structure Design of 2000kN Servo Press for Hot Forming,TG385
  21. Al Wire Bonding Failure and Automatic Optical Inspection on Power Device Leadframe,TG441

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