面向装配的平板形永磁直线电机的设计与制造

分析了平板形永磁直线电动机的结构特点和装配难点，介绍了面向装配的直线电机的设计和制造工艺方法，简化了装配难度，保障了电机的精度和性能，实践证明是有效的。     

大推力双U型永磁同步直线电机设计及性能测试

设计了一种应用于龙门五轴加工中心的大推力U型永磁同步直线电机,并对其性能进行了测试。结合电机使用环境和性能参数要求,对直线电机的基本尺寸、绕组形式和磁钢布置等进行了理论分析和计算;建立了该电机的有限元模型,采用有限元分析的方式对电机的静动态性能进行仿真分析,确定电机设计的最终方案并完成制造工作;应用直驱部件测试评价平台对电机的性能进行全面测试。实验测试结果满足系统的设计要求,证明了设计方法和设计过程的有效性。     

U型无铁芯永磁直线电机样机设计与有限元分析

针对传统设计方法的盲目性、高成本、周期长的问题.通过设计一种应用于大行程精密定位台中的U型无铁芯永磁直线电机(PMLM),探讨了一种新的设计方法.在分析其定子磁路和动子绕组结构特点的基础上,初步设计了电机参数.采用Maxwell 2DTransient求解器模块对电机特性进行分析,得到了电机空载反电动势、电机磁链、定位力特性和电磁推力.通过理论设计和有限元分析相结合的方法,设计制造了一台实验样机,并进行了相关实验.实验结果表明,电机的重复定位精度达2 μm;加速度能在0.08x内达到14 m/s2,在不同速度下的反向电动势成线性关系且与理论分析的吻合.研究结果表明,样机达到了设计要求,验证了设计方法的可行性.     

机床用永磁直线电机的推力波动优化研究

采用有限元法对机床用永磁直线电机的推力波动进行仿真计算,通过采用改变端齿的高度和宽度、磁钢倾斜角度等措施,在不减小电机输出推力的同时,以减小直线伺服电机推力波动为目标进行了电磁优化设计。经过优化设计后,永磁直线电机推力波动大幅减小,该文对永磁直线电机推力波动的理论研究和工程应用有一定的参考价值。     

基于极弧系数组合的永磁直线电机齿槽力削弱方法

永磁电机由于齿槽效应造成的推力波动一直是影响其性能的一个重要因素.为了削弱永磁同步直线电机的齿槽转矩,结合直线电机的结构特点,利用能量法和傅立叶分解的解析分析方法,推导出了齿槽转矩与极弧系数的数学关系表达式.由于边端力也会造成直线电机的推力波动,而边端力与动子长度密切相关,提出了一种基于不同极弧系数组合的齿槽转矩削弱方...     

永磁同步直线电机分数槽绕组谐波分析和齿槽力研究

介绍了永磁同步直线电机齿槽效应产生的原因,利用有限元法,对永磁同步直线电机谐波分量和齿槽力进行分析和仿真,运用傅立叶级数回归,求出各次谐波分量,分析结果表明,采用分数槽短距绕组方法可明显降低齿槽效应的影响。为进一步拟合出齿槽推力波动曲线,实现控制系统的推力补偿提供依据。     

永磁直线电机结构参数的DFSS和响应面法优化

在研究潜油直线电机的参数匹配过程中,提出了一种圆筒型永磁同步直线电机结构参数优化设计方法。基于一种六西格玛设计(DFSS)理念,结合数理统计理论,分析了气隙长度、定子轭厚度、齿宽、齿形角、主磁通永磁体有效长度、半闭口槽宽、极弧系数等参数对电机电磁推力及齿槽力影响。以增大推力及降低齿槽力为优化目标,采用2IV 7-3部分析因试验设计法,对电机主要本体结构参数进行筛选优化。分别筛选出了影响电磁推力和齿槽力的显著因子,并利用响应面法建立了相应的非线性数学模型。通过多目标遗传算法获得了Pareto最优解,得出最优结构参数组合。优化前后有限元仿真结果表明:平均电磁推力提升了28.83%,齿槽力降低了18%,推力及齿槽力波动显著减小;基于DFSS和响应面的优化方法用于研究潜油直线电机电磁结构参数优化是可行的。     

论高速永磁直线电机的测试

为控制高速永磁直线电机的运行精度与准确度,需要对高速永磁直线电机进行测试。对高速永磁直线电机的测试问题进行了综合论述,从内部条件和外部条件两个方面介绍了高速永磁直线电机的测试条件,并分析了高速永磁直线电机的测试方法及测试结果。     

基于等效磁化电流法的永磁同步直线电机静态气隙磁场计算

以1FN3100永磁同步直线电机为研究对象,基于解析法,给出了该直线电机二维稳态场的气隙磁场分布的计算公式,在此基础上,利用MATLAB数学工具绘出了1FN3100永磁同步直线电机的气隙磁密分布曲线。该方法为研究直线电机隔磁防护、推力波动、涡流损耗等热点和难点问题打下了基础。     

U型无铁心永磁直线电机样机设计与研究

设计了一种在大行程精密定位台中运用到的U型无铁心永磁直线电机。在分析该电机定子磁路和动子绕组的设计特点的基础上,采用Maxwell 2D Transient求解器模块,对电机磁路特性和电机在空载与负载两种工况下主要特性进行分析,得到了电机空载反电动势、电机磁链、定位力特性和电磁推力。通过对电机进行理论和有限元分析,在此基础上设计制造了试验样机,避免了传统设计方法的盲目性、高成本、周期长的弱点。     

Linear motor for ejector mechanism

Ejector mechanism actuators in electric injection moulding machines require large thrust and low operating rate. Although the ordinary linear synchronous motor (LSM) is unfit for this machine, the linear motor presented in this paper is suitable for this use as it is compact in size and more cost effective compared to LSM.This paper contains the new linear motor that can generate large thrusts for a short time: its mechanical design, simulated flux profile and experimental results of motor size and thrust output relationship are presented. The described linear motor has an approximate volume of 250 mm×250 mm×250 mm and generates a maximum thrust of about 20 kN at a current of 250 A. This revised version was published online in October 2004 with a correction to the issue number.     

磁悬浮永磁直线电动机及其控制系统研究

根据磁悬浮永磁直线电动机的特殊结构与运行机理,给出了电动机电磁推力和悬浮力的数学模型。建立了磁悬浮永磁直线电动机的有限元计算模型,对气隙磁密、电磁推力和悬浮力进行了有限元计算,并对气隙磁密作了谐波分析。设计了磁悬浮永磁直线电动机的研究样机,制作了磁悬浮子系统和进给伺服子系统,对系统进行实验研究,获得了磁悬浮子系统和进给子系统运行的实验结果。实验研究结果表明,该磁悬浮永磁直线电动机可实现直接驱动与无摩擦运行。     

圆筒型直线伺服电机研究

直线电机是将电能直接转换成直线运动机械能而不需要任何中间转换机构的动力装置。圆筒型永磁直线伺服电动机由初级(圆饼式线圈、控制盒等)及次级(外管、永磁体、磁极等)组成。电机工作时,可以初级固定,次级带动负载运动;也可以次级固定,初级带动负载运动。文中重点介绍了圆筒型直线伺服电机的结构及设计方案。     

一种双足驱动压电直线电机

为研制高精度、大行程、大推力的压电直线电机,设计了一种基于叠层压电陶瓷的步进式压电直线电机。分析了电机的工作原理,对电机的结构进行了设计,制作了原理样机,并进行了实验研究。实验表明,在一定频率范围内,定子驱动足振幅与电压成线性关系,且最大振幅可达2.9μm,电机最大无负载速度为796μm/s,最大输出推力为4.8N,达到了预期的目的。     

三角位移转换式压电直线电机

为了在保持电机精度的同时获得较大作动行程,提出了一种以叠层压电陶瓷作为激励振动源的压电直线电机。分析了电机的工作原理,推导了电机驱动足在工作时的运动轨迹。设计安装了电机样机,并对其定子进行了测试。最后,在两种激发条件下实验研究了电机的整机性能。结果表明:单组叠层压电陶瓷激励时,该样机定子驱动头在接触面法向和切向同时具有振动分量,并能够在阶跃和连续两种不同激励方式下实现单向大行程直线运动。以锯齿波激励时可实现步进运动,激励频率为20Hz时步距为0.1μm;以两路相位差π/2的正弦波激励时,可在1.5kHz到5.8kHz的激励频率区间输出稳定连续的直线运动,其运动速度随激励频率的升高而增大,在峰-峰值110V(50V偏置)的正弦电压激励下其推力可达4.8N。该电机具有高位置分辨率和宽频率响应,可以在两种工作模式下分别稳定地实现直线步进和大行程连续运行。     

Optimum design of the cored linear motor using experiment design

Recently, a linear motor has been becoming widely popular in office automation (OA) and factory automation (FA) systems due to its simple structure, high-speed operation, and precise positioning. In this study, a cored linear motor was designed to have a large thrust and small ripple because these are considered as indicators of motor performance. The thrust and ripple of the linear motor can be calculated by a finite element method (FEM) commercial program such as ANSYS. To design the cored linear motor, first, the design variables were selected through ANOM and ANOVA. The response surface method was applied to formulate the cost function of the second-order regression model, which can evaluate motor performance. By optimizing the cost function, it was possible to realize quickly the optimum design for a cored linear motor. As a result, the performance of the motor was improved. This paper was recommended for publication in revised form by Associate Editor Tae Hee Lee Mr. Sungill Seo received his B.S. and M.S. degree from the department of Mechanical Engineering, Sogang University, Seoul, S. Korea in 2006 and 2009, respectively. Mr. Seo is currently working for Hyundai Engineering. His research interests are in the area of optimum design of electric motors, metal forming, and process design. Naksoo Kim received his B.S. and M.S. degree from the department of Mechanical Design, Seoul National Uni-versity in 1982 and 1984, respectively. He then went on to receive his Ph. D. degree from U.C. Berkeley. Dr. Kim had worked for the ERC/NSM at the Ohio State University as a senior researcher and Hongik University as an assistant professor. He is currently a professor at the department of mechanical engineering, Sogang University. Dr. Kim’s research interests are in the area of metal forming plasticity, computer aided process analysis, and optimal design.     

卧式板型直线超声电机的微型化

基于L1B4板型直线超声电机,研制了一种外型尺寸为36mm×5mm×4mm的卧式板型微型直线超声电机。论述了电机的工作原理和运行机理,使用解析法和有限元法进行了微型化结构设计,分析了定子的振动模态,并实现了频率简并。通过模拟压电激励的动态频率响应,对比了样机的5片压电陶瓷布置方案和常用的两片压电陶瓷布置方案的共振位移响应曲线,证实了采用5片压电陶瓷布置方案增大了输出端点处产生的振动位移。样机特性测试实验表明,当激励信号电压为150Vpp,频率为62kHz时,电机最大速度为183.7mm/s,输出推力为50mN。预期该电机可以用于电机安置空间比较狭窄且需要一定动力的直线驱动场合。     

Development of a linear electrostrictive servo motor

This paper presents a linear electrostrictive servo motor with high resolution and large stroke for ultra-precision motion control. High thrust force is obtained by making use of an electromagnetic clamping mechanism with force magnifying structure in the motor design. An operator alterable iterative learning control algorithm is proposed for the motion control of the motor. A prototype is designed, fabricated and tested. Experimental results show that the prototype has a mechanical resolution of 0.02 μm, yaw error less than 2 μm and maximum thrust force of 30N. Applications of the motor include producing the servo feed motions required in micro electrical discharge machining (micro-EDM) system or as a motion control device for other precision machining systems.     

基于离散型扰动观测器的直线电动机控制研究

针对推力波动、摩擦力等因素对直线电动机控制性能的影响,设计了一种基于扰动观测器的高速高精度位置伺服系统。采用离散时间的扰动观测器设计方法,对考虑与忽略时间延迟环节时,扰动观测器的品质进行比较。仿真分析与试验研究表明：在高速高精度的直线电动机运动控制中,引入带有时间延迟的扰动观测器,能够消除直线电动机速度响应曲线中的微小振荡,减小位置响应曲线中的超调和稳定时间。     

FORCE RIPPLE SUPPRESSION TECHNOLOGY FOR LINEAR MOTORS BASED ON BACK PROPAGATION NEURAL NETWORK

Various force disturbances influence the thrust force of linear motors when a linear motor （LM） is running. Among all of force disturbances, the force ripple is the dominant while a linear motor runs in low speed. In order to suppress the force ripple, back propagation（BP） neural network is proposed to learn the function of the force ripple of linear motors, and the acquisition method of training samples is proposed based on a disturbance observer. An off-line BP neural network is used mainly because of its high running efficiency and the real-time requirement of the servo control system of a linear motor. By using the function, the force ripple is on-line compensated according to the position of the LM. The experimental results show that the force ripple is effectively suppressed by the compensation of the BP neural network.