Multi-objective Optimization Of Transverse Flux Permanent Magnet Linear Moto

The transverse flux permanent magnet linear motor is widely used in numerical control machine tools,linear ejection,semiconductor manufacturing and other fields.It has many advantages,such as high efficiency,high accuracy,and strong reliability.The C-shaped open Ωstator transverse flux permanent magnet linear motor(COΩ-TFPMLM)proposed in this paper belongs to a new type of permanent magnet linear motor.The structure of the motor is more compact,and the permanent magnet and moving iron core are located on the secondary.For transverse flux permanent magnet linear motor,this paper mainly studies the following parts:Firstly,based on the topology and working principle of a transverse flux permanent magnet linear motor,a C-shaped open Ω stator topology is proposed.By analyzing the operating mechanism of the magnetic circuit and magnetic flux direction of the motor,a mathematical model of the motor is established and the mathematical expressions of the back electromotive force,positioning force,and load thrust of the motor are given.Then,Maxwell was used to model the structure of COΩ-TFPMLM single-phase and three-phase motors,and simulated and analyzed the magnetic linkage,no-load back EMF,positioning force,load thrust,etc.Compared with BBΩ-TFPMLM models of the same size and material,the results show that the magnetic linkage of the proposed motor is increased by 0.03 Wb,the back electromotive force amplitude is increased by 4V,and the thrust amplitude is increased by 15 N.Secondly,aiming at the problem of excessive fluctuation of motor thrust,the Taguchi method and three-dimensional finite element analysis method are used to carry out multiobjective optimization design for COΩ-TFPMLM.The parametric scanning function is used to determine the optimal range of air gap length,permanent magnet thickness,moving gear tooth width and dislocation distance,and then the orthogonal experimental table is established and the optimal structural parameters are analyzed.The optimization results show that the positioning force peak to peak decreases by 37.2%,the back EMF amplitude increases by 7.6%,the thrust amplitude increases by 15.6%,and the thrust fluctuation decreases by 7%.The multiobjective optimization effect is achieved,and the motor performance is improved.Then,the temperature field of the optimized motor is simulated and analyzed.The finite element analysis software is used to calculate the losses of each part of the motor,and it is introduced as a heat source into Workbench for magnetothermal coupling analysis.The temperature distribution rules of each part of the motor are obtained.The simulation results show that under the rated current,the steady-state temperature rise of the stator core is 29.21℃,and the steady-state temperature rise of the rotor core is 11.12℃.The insulation level of the motor reaches Grade E,indicating that the temperature rise of the motor meets the actual use requirements.Finally,a prototype was manufactured and a performance testing platform suitable for this motor was designed.The positioning force,back electromotive force,thrust,and temperature rise of the prototype were measured.The measurement results are basically consistent with the simulation values,verifying the accuracy of theoretical analysis and multi-objective optimization.