| Permanent magnet synchronous linear motor(PMLSM)can perform linear motion with Zero drive without any mechanical deceleration equipment or transmission parts.This unique characteristic brings several advantages to PMLSM,including no backlash,compact mechanical structure,less friction,higher thrust density and lower heat loss.It is often used in some light load servo systems which require high precision.However,ironless PMLSM also has low thrust density and poor economy caused by excessive permanent magnet consumption,which hinders its wide-scale promotion and development.Therefore,ironless linear motors have been developed to increase output thrust,reduce thrust fluctuations,and reduce costs.The research in this area has broad prospects.The main tasks completed in this paper are:1.In this paper,the mathematical model of electromagnetic field in Coreless Permanent magnet linear synchronous motor is established.The equivalent magnetization current method is used to solve the mathematical model.The permanent magnet is equivalent to the current layer,and the vector magnetic potential differential equations of the internal air gap region I and the magnetic pole region II are established.Furthermore,the analytical solution model of the magnetic field and the motor size of each part of the motor is established by the equivalent magnetization method.The results calculated by the analytical method are compared with the simulation simulation of the finite element method to verify that the equivalent magnetization method is reliable.and the analytical formula of each harmonic component of air gap flux density is derived,and the influence factors on the excitation field waveform quality of Coreless Permanent magnet linear motor are qualitatively analyzed.2.The structure of non stack winding is analyzed,and the analytical formula of output performance of coreless PMLSM is established;the steps of building PMLSM finite element model and parameter scanning technology are described,and the parametric simulation of permanent magnet and winding parameters is carried out.3.Use Isight software to build a multi-objective optimization design process for ironless linear motors to improve the average thrust,reduce thrust fluctuations,and reduce the amount of permanent magnets as the optimization design goals.Determine the range of optimization parameters,combine the optimal Latin hypercube design sampling method with the response surface method,establish a high-precision response surface model for the thrust performance of ironless PMLSM,and create a multiobjective optimization model for ironless PMLSM;adopt The NSGA-Ⅱ algorithm performs multi-objective optimization to obtain the best combination of parameters.4.Method of using finite element method for magnetic-thermal coupling simulation to solve temperature field analysis The simplified model of the winding is created to analyze the main heat source of PMLSM.The primary and secondary losses are calculated by using ANSYS Maxwell software,which is imported into ANSYS Workbench to carry out the magnetic thermal coupling analysis,and the temperature nephogram of the motor under different currents is obtained.According to the calculation results,it is found that the highest temperature is in the middle of the winding,and the winding temperature increases with the increase of current.The temperature of the coreless PMLSM is in a reasonable range under the rated current,which verifies the rationality of the design.5.The prototype components and PMLSM prototype are developed,and the performance test platform for PMLSM prototype is built.The thrust and thrust fluctuation experiments are carried out to verify the effectiveness of theoretical analysis and optimization design. |
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