横向磁通永磁直线电机电磁振动特性分析

doi:10.19595/j.cnki.1000-6753.tces.221895

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摘要横向磁通永磁直线电机的电负荷与磁负荷相互解耦且各相之间相互解耦,易于实现模块化和多相化,因此在石油开采领域有着良好的应用前景。本文基于磁场调制原理,对横向磁通永磁直线电机的径向电磁力波进行了推导计算,得出对径向电磁力波影响最大的因素为轴向气隙磁密分量与径向气隙磁密分量,在此基础上对径向电磁力波的时空特性与频谱特性进行仿真计算,得出电枢磁密对电机径向电磁力波的频谱特性的影响;然后考虑到电机实际运行中可能出现的次级偏心问题,揭示偏心度的大小对径向电磁力波幅值的影响,并对比不同偏心度下的电机径向磁拉力与轴向磁拉力,定量分析偏心度对不平衡磁拉力的影响;最后,为避免共振,利用有限元软件对电机的初级进行了模态分析与谐响应分析,结果表明低速状态下横向磁通永磁直线电机的额定运行频率较低,不会引起初级的共振,适合用作往复式潜油电泵的驱动电机。

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关键词 ：横向磁通永磁直线电机, 径向电磁力波, 电磁振动, 偏心度

Abstract：As the only power source of the reciprocating submersible pump system, the operation performance of the submersible linear motor directly affects the operation performance of the whole pump system. Therefore, the selection of linear motor is particularly important. As a special motor with high thrust density, Transverse Flux Permanent Magnet Linear Motor (TFPMLM)benefits from the transverse flux structure, the electrical load and the magnetic load are mutually decouped and each phase is mutually decouped, and the motor is easy to achieve modularization and multiphase, based on the above characteristics, TFPMLM is more suitable for application in the field of oil exploitation.
In the actual process of oil exploitation, the disturbance from the outside of the motor and the vibration of the motor will lead to the reduction of the insulation of the motor and thus reduce the service life of the motor. In order to solve the vibration problem of TFPMLM, the radial electromagnetic force wave of TFPMLM is derived in this paper, and then the eccentricity problem which may occur in the operation of the motor is studied. Finally, the primary mode and electromagnetic vibration characteristics of TFPMLM are analyzed and summarized.
Firstly, the electromagnetic wave of TFPMLM is analyzed, and the expressions of the primary and secondary permeability and magnetomotive force of the motor are obtained by using the principle of magnetic field modulation, and the magnetic density of the air gap is obtained. On this basis, the magnetic density of the synthetic air gap is obtained by considering the role of the armature winding. Maxwell stress tensor method was used to obtain the expressions of electromagnetic force waves acting on the primary teeth in all directions. Then, according to the principle of linear superposition of magnetic density, the air gap magnetic density was decomposed into armature magnetic density, primary permanent magnet magnetic density and secondary permanent magnet magnetic density. By combining the above expressions, the simplified mathematical expression of radial electromagnetic force waves was finally obtained. Then the temporal and spatial characteristics and spectral characteristics of radial electromagnetic waves are simulated and the influence of armature magnetic density on the spectral characteristics of radial electromagnetic waves is obtained.
Secondly, in view of the secondary eccentricity which may be caused by motor vibration, the influence of eccentricity on electromagnetic wave spectrum characteristics is analyzed, and the results show that the secondary eccentricity has greater influence on the 3rd and 6th order harmonics. By comparing the radial magnetic pull and axial electromagnetic force wave of the motor under different eccentricity, it is concluded that when the secondary eccentricity fault occurs, a large unilateral magnetic pull will be generated in the radial direction of the secondary, and the amplitude of thrust fluctuation will increase.
Finally, in order to avoid resonance, the modal analysis and harmonic response analysis of the primary of TFPMLM are carried out. The results of modal analysis show that the motor will not resonate due to electromagnetic force. The results of harmonic response analysis show that compared with the primary teeth, the electromagnetic force wave has a greater impact on the outer surface of the primary circumference.

Key words： Transverse flux permanent magnet linear motor radial electromagnetic force wave electromagnetic vibration eccentricity

收稿日期: 2022-10-08

PACS:

TM359.4

基金资助:国家自然科学基金（52177032）、特种电机与高压电器教育部重点实验室（沈阳工业大学）（KFKT202107）资助项目

通讯作者: 赵玫女,1983年生,博士,副教授,硕士生导师,研究方向为直线电机系统及其控制。E-mail：zhaomei@hit.edu.cn

作者简介: 赵君男,1998年生,硕士研究生,研究方向为直线电机一体化设计。E-mail：21S130577@stu.hit.edu.cn

引用本文:

赵玫, 赵君, 左思承, 禹国栋, 张华强. 横向磁通永磁直线电机电磁振动特性分析[J]. 电工技术学报, 0, (): 103-103. Zhao Mei, Zhao Jun, Zuo Sicheng, Yu Guodong, Zhang Huaqiang. Analysis of Electromagnetic Vibration Characteristics of Transverse Flux Permanent Magnet Linear Motor. Transactions of China Electrotechnical Society, 0, (): 103-103.

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