换位线圈匝间破压的原因及处理

高压电机通常采用成型绕组,线圈制造常采用弓型换位绕制方法。介绍了弓形换位线圈(编花线圈)与N形换位线圈的特点,以及弓形换位线圈制造过程中易发生的滚包、机械损伤等问题。并针对这些问题采取的解决措施,使之能满足定子线圈及定子绕组各项性能指标。     

低速大功率组合式定子电机不等跨距绕组参数研究

针对大型低速大功率交流电机定子过大带来的关于电机制造、运输、安装、调试及维修等一系列问题,定子绕组在采用多支路的基础上,提出一种不等跨距及反向嵌放的形式,实现电机定子单元模块化。由于大跨距线圈带来绕组的不对称,因而带来三相绕组参数的不对称;为此,分别对于常规线圈和不等跨距线圈的电感参数迚行分析和计算。通过比较常规线圈和不等跨距线圈的自感和互感对三相绕组参数不对称问题迚行分析和判断,并制作样机迚行实验分析。所得结论对于单元模块组合式定子电机的深入研究具有一定参考价值。     

一种交流牵引电机单叠绕组线圈的参数化建模方法

对单叠绕组线圈的设计参量进行说明,并推导出过程参量的表达式。然后阐述了在UG中建立定子线圈参数化模型的过程,最后以某电机为例,调用线圈参数化模型来生成新的线圈,提高设计效率。     

轴向磁通切换型混合励磁同步电机优化分析

提出一种定子分割式轴向磁通切换型混合励磁同步电机,分析电机的电磁特性,进行优化分析。基于三维有限元方法,建立电机的有限元分析模型,获得电枢绕组磁链、空载电动势及绕组电感等参数电磁特性;分析定子槽口宽度、永磁体宽度、定子槽深度及转子齿宽度变化对绕组感应电动势的影响规律。有限元分析结果表明:通过调节励磁电流,线圈磁通变化明显,调磁效果较好;优化分析结果为电机尺寸的确定提供了一定的理论依据。     

利用检测线圈的开关磁阻电机转子位置估计方法（英文）

本文提出了一种新型的12/8结构开关磁阻电机的转子位置检测方法。该方法将检测线圈绕组与电机主绕组同时绕制于电机定子齿上,检测线圈的结构可有效抑制主绕组工作产生的感应电势。本文亦介绍了该结构检测线圈的参数设计原则。通过注入高频信号,电机的转子位置信号可通过处理采样电阻压降获得。由于检测线圈绕组与主绕组相互独立,因此高频信号无论转速高低均可注入,使得该方法的转速应用范围较宽。最后,本文针对一台12/8开关磁阻电机进行了仿真与实验,验证了该方法的可行性。     

PCB定子无铁心盘式电机分布式绕组的对比分析

针对印制电路板(PCB)定子绕组的特点,以PCB定子无铁心盘式电机的输出功率最大化作为目标,设计一种应用于PCB定子无铁心盘式电机的分布式绕组,并将这种绕组与传统的螺旋形绕组进行对比分析。首先建立PCB定子盘式电机的三维解析模型,给出所设计的分布式PCB绕组的结构及特点,推导出电机的反电动势及绕组损耗等解析式。然后采用有限元法对应用两种绕组的PCB定子无铁心盘式电机进行仿真分析,对比采用两种绕组对PCB定子无铁心盘式电机多方面的性能影响。结果表明分布式绕组的应用使PCB定子电机获得更高的输出功率,同时减小了电机的绕组损耗,也为PCB定子无铁心盘式电机的设计提供一定的参考依据和实际工程价值。     

电机定子线圈热压成型设备的隔热分析及温度控制

控制电机定子线圈热压成型专用设备的温度是提高电机定子线圈成型制造工艺水平的关键所在,本文介绍了电机定子圈式成型线圈热压型机温控系统工况、隔热分析计算和温度测量与控制,最终实现热压型机自动加热、加压,并定时保温、保压.     

中型电机线圈整形模具及其使用方法

中型电机指机座中心高在355 ～ 630 mm或定子铁心外径在560～990 mm的电机.中型电机的绕组是交流电机的定子绕组、绕线转子绕组或直流电机的电枢绕组,多采用线圈截面为矩形的双层短距叠绕组.通常,线圈直线段的长度为350 ～1500 mm,线圈边的高度为15～ 50 mm,宽度为15～30 mm.在制造工艺方面,电机的线圈、整个定子、转子都要经过真空压力浸漆,使绕组具有更好的绝缘、防潮和散热性能.     

新型外转子Halbach永磁阵列定子无铁心电机设计与分析

具有气隙磁密正弦、磁密高等优点的halbach阵列永磁外转子电机应用于飞轮储能系统的电动/发电机可以有效提升系统集成度,简化系统结构,提高系统功率密度。本文研究分析新型外转子halbach永磁阵列定子无铁心电机的转子结构和定子绕组设计方法;通过有限元方法分析了磁场分布和定子绕组损耗;研究定子绕组区域磁场分布变化特征,采用每匝绕组线圈内部导体换位技术有效抑制线圈导体内部之间的环流;最后,通过场路耦合方法分析定子绕组电流对转子永磁体涡流损耗影响。本文优化设计的200k W外转子halbach永磁阵列定子无铁心电机的机电能量转化效率高达99%以上。     

成型绕组永磁电机优化设计

成型绕组电机净槽满率高,在电机的额定功率、冷却系统、定子内外径、定子槽面积不变的条件下,采用成型绕组时,电机铁心长度更短,转矩密度更高。将节距为1的传统上下双层成型绕组结构改为左右放置,降低了成型绕组的绕制难度,提高了生产效率。开口槽槽口宽度较大,会增加气隙磁密中的谐波含量,降低电机运行稳定性。采用Taguchi方法,以成型绕组电机的气隙长度、定子槽宽和槽深为优化变量,对齿槽转矩、输出转矩进行优化;并建立电机模型进行有限元仿真分析。最终,通过样机试验验证了扁铜线成型绕组电机方案设计的合理性。     

Brushless DC Motors Using Unsymmetrical Field Magnetization

The prevalent types of brushless dc motors have evolved from the classical synchronous machine structures, using two-phase, three-phase, or four-phase stator windings and symmetrical N-S field magnetization patterns. The popular two-phase two-pulse brushless motor requires auxiliary means for starting and for ensuring relatively constant torque with rotor position. Three methods are used: 1) skewed stator poles, which introduce unsymmetrical air-gap reluctance and the resultant unsymmetrical air-gap magnetic field, 2) the Wessels design, which uses a rotor pole pattern of north-south-zero (N-S-0) and auxiliary stator poles, and 3) a combination of N-S-0 rotor pattern and 1200 electrical (el) pitch stator coils to produce an unsymmetrical air-gap magnetic field. The electromagnetic torque produced by motors using each of these methods is calculated using the coenergy method.     

集中绕组永磁无刷直流电机电枢反应及绕组电感的解析计算

基于深槽集中绕组的结构特点，采用镜像法，建立了适合集中绕组无刷电机的电枢反应求解模型。充分考虑电机齿槽影响，给出了电枢反应磁场的解析表达式，对不同控制方式下的电枢反应分别作了研究，并在此基础上推导了电机绕组电感的通用求解公式，从而为集中绕组无刷电机的参数设计和特性分析提供了理论依据。样机实验表明，其具有很好的工程适用性，理论计算与实测值吻合。     

Development of Motor Stator with Rectangular‐Wire Lap Winding and an Automatic Process for Its Production

Aimed at providing small high‐power motors with excellent efficiency, a motor stator with rectangular‐wire lap windings and an automatic process for its production were developed. The structure of the windings, namely, two continuous “α‐shaped” coils, and the coil‐production method (involving simultaneous coil forming and coil insertion) enable mass production of this stator. The slot‐fill rate for a prototype stator was 80.5%, and the total height of the coil ends was 60 mm to 72 mm. On the basis of the ratio of the sectional areas of two types of the motors, its efficiency was estimated to be 3.7% higher than the efficiencies of motor stators with round‐wire concentric windings (at a rotation speed of 1000/min). In addition, the number of coil parts and the number of welding points were greatly reduced compared to those of a stator with segmented‐coil wave windings.     

Permanent magnet synchronous machines with concentrated coil armature windings: analysis and test validation of Single Stator–Double Rotor,axial flux machines

Some design and operation aspects of axial flux permanent magnet synchronous machines, employing armature windings with concentrated coils wound around the stator teeth, are presented. The e.m.f. control is based on the variation of the windings flux linkage, obtained by modifying the stator (or rotor) configuration. Thanks to the high number of poles and the excellent waveform quality, even with deep field weakening, these machines exhibit a satisfactory operation at low speed, both as generators and motors. In the paper, the main constructive machine features are discussed, together with some design and FEM results. A test on a prototype has also been carried out.     

高压异步电动机正弦硬绕组的设计

基于谐波含量较低的正弦散嵌绕组在中小型异步电动中的应用思想,提出了适用于高压大中型异步电动机的正弦硬绕组.通过对正弦硬绕组的谐波分析,针对硬叠绕组与散嵌叠绕组的不同点,并结合散嵌正弦绕组的设计思路,给出了由普通双层硬绕组改为正弦硬叠绕组的设计方法,包括联结和△联结的并联支路数、导线并绕根数、扁导线线规及线圈匝数确定方法.样机设计结果表明该方法的可行性,且在不增加电机成本的情况下,正弦硬绕组能够进一步提高高压异步电动机的效率,这对开发高压高效异步电动机是很有参考价值的.     

Analysis of armature reaction and winding inductances of permanent magnet brushless DC motor with deep slot concentrated coils

Based on the configuration of deep slot concentrated coils, an analytical model is developed for predicting the armature reaction field produced by the 3-phase stator windings of permanent magnet brushless DC motors with concentrated coils by using the image method and the analytical functions of the armature reaction and winding inductances are proposed accounting for the influence of stator slotting. This approach is different from the method of equivalent distributed current sheet and more suitable for electric machines, which have concentrated coils and deeper slots. Under different control mode, the different analytical functions are presented. This will be helpful when further analyzing the performance of the motor. The results agree with the experiment very well. __________ Translated from Proceedings of the Chinese Society for Electrical Engineering, 2005, 25(12): 127–132 (in Chinese)     

Proposal and Feasibility Study of the Integrated Diode Synchronous Motor

This paper presents a new type of magnet‐free motor that has concentrated stator windings and rotor coils with a pair of diodes. The most important feature of this motor is that currents in the rotor coils can be generated by utilizing the changes in the spatial second harmonic of the magnetic fields due to the concentrated stator windings, which normally increase motor losses. A prototype of the motor was designed and fabricated, and its basic performance was evaluated. First, using simplified analytic models, we explain the mechanism of inducing currents in the rotor coils by the changes in the spatial second harmonic of the magnetic fields. Second, we compare the torque performance of the proposed motor and that of other types of motors including a magnet motor through finite‐element analyses. The analyzed data show that the proposed motor can possess greater torque/volume ratio than that of the other motors. Finally, using the measured data, we validate the mechanism of inducing currents in the rotor coils, and examine the torque and power characteristics of the motor.     

变频牵引电机定子绕组绝缘老化特性研究

对比测量了不同运行年限的变频牵引电机的定子绕组绝缘诊断参数,包括绝缘电阻、介质损耗因数、局部放电起始电压(PDIV)、剩余击穿电压等特征参数,以及沿绕组不同部位的绝缘材料取样进行了热失重分析(TGA)来研究绝缘老化特征。介电性能测量结果表明,与新电机相比,运行后定子绕组的绝缘介电性能有不同程度的下降,出槽口附近绝缘的老化程度高于槽内。TGA分析结果表明,使用了长达10年的牵引电机定子绕组绝缘性能略有下降,且线圈下层边的绝缘老化比上层边明显。     

永磁无刷直流电机空载气隙磁场和绕组反电势的解析计算

该文利用许－克变换构造了考虑齿槽效应的气隙相对比磁导函数，该气隙相对比磁导函数反映了齿槽效应对气隙磁场分布的影响，且这种影响的程度随气隙中的径向位置而变化，在忽略铁心饱和的情况下，结合偏微分方程的解析算法，提出了一种考虑齿槽效应的永磁无刷直流电机空载气隙磁场分布和相绕相反电动势的解析计算方法，计算结果与二维有限元计算结果对比，其计算波形和大小吻合很好，证明此方法是正确的、可靠的、为永磁无刷直流电机优化设计和性能分析提供了基本分析手段。