Optimization Design And Experimental Investigation Of Variable-leakage-flux Interior Permanent Magnet Synchronous Machine

Variable-leakage-flux interior permanent magnet(PM)machine(VLF-IPMM)is a kind of adjusted airgap flux permanent magnet synchronous motor.Due to the mechanical fluxadjusting device placed on both sides of the rotor,it has advantages of high torque density,high efficiency,and leakage flux controllability.Based on the basic structure characteristics and mechanical flux-adjusting method,this dissertation takes VLF-IPMM as object to study its operating principle,mathematical models.Moreover,the optimization of the structure and the analysis of coordinative motion are performed by computer aided engineering software.To verify the validity the flux-adjusting motor and simulation analysis,a prototype is manufactured and tested.All these works lay the theoretical and technical foundations for the application in industry and engineering.The main research work and fruits of this dissertation are as follow:(1)Study of structure and operating principle.A novel variable-flux permanent magnet machine is proposed in this dissertation.The structure characteristics of the machine and the mechanical device are systematically analyzed,and the variable-leakage-flux principle is explained in this thesis.In addition,mathematical models in stator and rotor reference frames are built in line with the VLF principle,including flux-linkage equation,voltage equation,and power equation.(2)Optimization design of the VLF-IPM motor.A hybrid optimization method is presented to apply to the type of the motor.The parametric model of motor is established by computer software.The flux-adjusting capability of the proposed motor is optimized by the single parameter scanning method.Multi-objective optimization design method,combining with the parameter sensitivity analysis and NSGA-II,is adopted to study the influence of geometric parameters on three optimization objectives,namely,output torque,torque ripple,and cogging torque.By the weighted objective function,the optimal size of the motor is selected to determine the final model.(3)Mechanical dynamics simulation.The force analysis of sliding blocks is performed in the first step.The internal coordination rule of the electromechanical coupling system is obtained by an in-depth analysis of coordinative motion between the machine and mechanical device.The changing rule of rotational angle of magnetic poles is study and verified in virtual prototype technology based on ADAMS.(4)Manufacture and experimental verification of prototype.The prototype is made in line with basic parameters and processing drawings.The corresponding experimental platform is built by experimental facilities.And the back-EMF and flux-adjusting properties are tested to verify the effectiveness of design and simulation analysis.