| In the numerical control machine tools,the friction problem between the moving part and the static guide rail seriously restricts the performance of direct drive system of the numerical control machine tools.The application of the controllable excitation linear magnetic levitation synchronous motor to numerical control machine tools can not only eliminate the intermediate mechanical transmission structure and reduce the power consumption,but also fundamentally solve the problem of friction resistance of numerical control machine tools.The dissertation is funded by the National Natural Science Foundation Project “Research on Operational Mechanism and Control Strategy of Controllable Excitation Linear Synchronous Motor Maglev Feed Platform(Project Approval No.: 51575363)”.Under the application background of the maglev feed platform,the electromagnetic characteristics and optimal design of controllable excitation linear magnetic levitation synchronous motor are studied and analyzed.The main contents of this dissertation are as follows:(1)Operation mechanism and mathematical model of controllable excitation linear magnetic suspension synchronous motor.First of all,based on the operating mechanism of ordinary rotating synchronous motor,and combined with the structural characteristics of the linear motor,the structure and operating principle of the controllable excitation linear magnetic levitation synchronous motor are studied and analyzed.Then,according to the basic idea of vector control of the rotating synchronous motor and the basic principle of electromagnetics and kinematics,the mathematical model of the controllable excitation linear magnetic suspension synchronous motor is established.(2)Structure design of controllable excitation linear magnetic suspension synchronous motor.First,Referring to the design method of the rotating synchronous motor,and according to the special structure and design requirements of the controllable excitation linear magnetic suspension synchronous motor,the formula for calculating the electromagnetic field of the linear motor is derived.Then,the main parameters of the linear motor was designed,such as the main dimensions,the length of the air gap,pole-slot match and the winding form.Finally,a controllable excitation linear magnetic levitation synchronous motor was designed by using the field-circuit combined design method.(3)Finite element simulation analysis of controllable excitation linear magnetic suspension synchronous motor.According to the basic structural parameters of the motor,the electromagnetic field of the controllable excitation linear magnetic suspension synchronous motor is calculated with the aid of the finite element simulation software.Through the analysis of the magnetic field of the motor,the rationality of the motor structural design is verified,and the electromagnetic force characteristic of the motor is further studied.(4)Structure optimization of controllable excitation linear magnetic levitation synchronous motor.First,combining with the performance requirement and practical application of the controllable excitation linear magnetic levitation synchronous motor,the optimization objective function of the motor is established,and the appropriate optimization variables are selected.Then,under certain constraints,the structure of the controllable excitation linear magnetic levitation synchronous motor is optimized by the particle swarm optimization algorithm.Finally,reasonable optimization parameters of the motor structure is obtained to improve part of the performance of the motor. |
