高速开关磁阻电动机用非晶定子铁心及磁性能

为了分析非晶电机铁心磁特性及其对开关磁阻电动机性能影响,分别用叠块法和冲片法试制了800W,35000r/min高速开关磁阻电动机用非晶定子铁心并测试其磁特性,将具有非晶叠块定子铁心的电机静态性能和负载运行性能与硅钢电机做了对比测试。结果表明,非晶合金铁心具有高磁导率、低损耗特性,但受材料性能及加工过程影响,其饱和磁密及叠压系数均低于硅钢铁心。非晶铁心可提高开关磁阻电动机在高频下的相电感峰值,并显著降低电机在高速运转条件下铁心损耗及温升。该研究结果可为高效、高速非晶开关磁阻电动机设计和优化提供参考。     

基于ANSYS的高速感应电机设计

设计了一台额定功率2 kW,额定转速59000 r/min的高速感应电机。根据电机在高速运行时带来的高损耗,选取了性能更好的铁基纳米晶合金作为高速感应电机的定子铁心材料。对于感应电机在高转差率时产生的高谐波转矩,通过采用带端环的闭口圆形槽转子,使电机具有较高的起动电阻,从而获得优良的起动及运行特性,利用ANSYS软件对其转子结构进行应力分析,并验证在高转速下的可靠性。建立了高速感应电机的有限元模型,通过与相同结构参数的硅钢DW310_35电机进行性能对比。结果显示,采用铁基纳米晶合金1K107定子铁心的电机相比硅钢DW310_35电机,总损耗减小了81.2 W,效率提高了4.5%,功率因数提高了0.031。     

高速电机用非晶、纳米晶定子铁心研究

采用铁基非晶和纳米晶合金带材分别制作定子铁心,并将纳米晶定子铁心与非晶定子铁心和硅钢定子铁心的磁性能与噪声进行了对比分析。结果显示,与硅钢相比,在相同频率和磁通密度下非晶、纳米晶定子铁心的损耗大幅度降低,非晶定子铁心的损耗仅为硅钢定子铁心的10%左右,纳米晶定子铁心的损耗仅为硅钢定子铁心的3%左右。当工作频率在400 Hz以下时,硅钢定子铁心的噪声最低,非晶定子铁心的噪声最高;当工作频率在400 Hz以上时,非晶定子铁心的噪声最高,纳米晶定子铁心的噪声最低。     

高速电机用非晶合金定子铁心的损耗特性研究

采用热处理后浸漆、固化、切割的方法将非晶态合金带材制作成电机定子铁心,研究了尺寸相同的非晶合金定子铁心与硅钢定子铁心的磁性能.结果表明,在频率为1 kHz、磁通密度为1.0 T时非晶定子铁心的损耗为42W/kg,在相同测试条件下,硅钢定子铁心的损耗为102 W/kg,非晶定子铁心在1 kHz、1.0 T时的损耗比相同尺寸的硅钢定子铁心的损耗降低了58.8%.     

非晶材料在高空飞行器用高速电机中的应用研究

高空飞行器用无刷电机由于具有高速的要求,而传统的硅钢材料电机在高速下铁耗较大,电机效率低发热大,为了提升电机的性能,采用了非晶合金材料代替硅钢材料的措施。为了研究措施的可行性和有效性,本文对非晶合金材料和硅钢材料的特性进行了对比,分析电机定子铁心采用两种材料对其性能的影响,并通过实验测试结果对比,证明了非晶合金材料对高速高频电机的性能提升具有明显的效果。     

永磁同步电动机定子铁心采用非晶与硅钢的性能对比

非晶合金具有高磁导率、低矫顽力、低损耗的优势,将其应用于电磁装置以提升性能成为当前的研究热点。针对非晶材料在高速电机中的效率提升已有许多研究,为研究较低转速下非晶材料对电机性能的影响,制作了两台电动汽车转向泵用1.5 kW永磁同步电动机,其中一台的定子铁心采用非晶材料,另一台采用普通硅钢材料。采用电磁场有限元法求解了两台电机在低速下的磁场分布、定子铁心损耗分布和效率。计算结果表明,非晶材料同样能够提升低速电机性能。然后在不同供电频率下进行了计算,结果表明:频率越高,非晶电机的效率高于硅钢电机越多。搭建了实验平台,测试结果表明,在100 Hz、1200 r/min时非晶合金电机效率比硅钢电机高1.4%,与仿真结果一致。     

非晶合金永磁电机负载损耗及效率特性分析

为了研究采用非晶合金材料代替硅钢片材料制作铁心后,永磁电机在负载运行时的损耗与效率的变化规律,研制了两台相同结构尺寸参数的非晶合金永磁电机和硅钢片永磁电机。利用实验方法测试了两台电机在相同运行工况下的损耗与效率特性,并借助有限元方法对两台电机不同负载率时的损耗进行了对比分析。结果显示,轻载时,非晶合金永磁电机定子铁心损耗低于硅钢片电机,效率优势明显;但随着负载率的增加,非晶合金电机定子铁心饱和严重,导致绕组磁动势波形畸变,由绕组磁动势谐波引起的损耗高于硅钢片电机,非晶合金电机效率优势随负载率的增加逐渐减小。     

非晶合金在永磁同步电机的应用

基于非晶合金Metglas官网提供的Metglas2605SA1非晶合金材料的相关性能参数,利用Ansoft Maxwell分析定子铁心材料采用非晶合金Metglas2605SA1,且单频率激励下的永磁同步电动机的电磁性能与输出特性,同时分析了气隙及定子轭部磁密的空间分布,以及永磁电机存在的齿槽转矩问题,并与具有相同结构和控制参数的定子铁心采用硅钢D23-50永磁电机进行对比分析。仿真结果表明,采用定子铁心采用非晶合金永磁电机相比于硅钢D23-50永磁电机有以下优势:电机重量轻,铁耗相对于硅钢电机更小,效率比硅钢电机高2.41%,磁场响应能力强。但其齿槽转矩的数值高于硅钢电机。     

电动汽车驱动非晶开关磁阻电机静态测试与性能仿真

试制了1台8 k W电动汽车驱动非晶开关磁阻电机(SRM),并对其进行了静态性能测试。使用有限元方法对电机在低速大扭矩及高速小扭矩共计4种工况下的铁耗、铜耗、扭矩和效率等性能进行了仿真计算。结果表明,相对于硅钢,非晶合金的高磁导率特性可有效保持SRM在高频激励条件下的相电感值;非晶合金的低损耗特性可有效降低电机铁耗值,尤其在铁耗为电机主要损耗的高速小扭矩工况下,可显著提升电机效率(3%~9%)。然而,非晶合金的饱和磁密较低,非晶电机的磁链-电流曲线相对于硅钢电机会有区别,应在其工作磁密、结构尺寸及控制参数上进行调整和优化以获得最佳性能。     

非晶电机机械性能与电磁特性的数值分析

基于某公司提供的Metglas2605SA1非晶合金材料相关性能参数,利用商用软件Ansoft研究了非晶合金Metglas2605SA1作为电机定子铁心对电机电磁性能及输出特性的影响。分析了气隙及定子轭部磁密的时空分布,并与相同结构参数的硅钢D23_50电机进行了对比分析。结果表明,采用非晶合金Metglas2605SA1定子铁心的三相异步电机相比硅钢D23_50三相异步电机具有以下优势:电机总重量减少4.0%,总损耗降低16.8%,效率提高了1.8%,功率因数提高了0.015,起动性能得到了显著改善。     

水电站水轮发电机定子铁心铁损试验的现场实施

结合万家寨水电站5号机组A级检修定子铁损试验的现场情况,对定子铁损试验的现场实施、试验数据和结果以及现场试验条件与漏磁对该项试验的影响等进行了详细分析。定子铁损试验结果,检验了对5号发电机定子铁心溢出情况处理后的效果,经过处理的部分,温度、温升不明显,说明经过处理的矽钢片片间绝缘未损坏。针对万家寨水电站定子铁损试验的情况,对该项试验在现场实施过程中的试验电源选择、试验接线方法、温度测量、计算分析等方面提出建议。     

一种电机用非晶合金铁心的制备及其磁性能研究

将叠层非晶薄带整体切割后机械固定成形,再采用热处理的方法,将非晶合金带材制作成电机定子铁心,并与相同尺寸的层间粘接法制作的非晶合金铁心以及硅钢铁心进行磁性能对比.结果显示,机械固定法制备的非晶合金铁心具有较低的铁心损耗和较高的磁导率,并且励磁磁场强度在0～2000 A/m范围内具有较高的磁通密度.     

Test Results of an SRM Made From a Layered Block of Heat-Treated Amorphous Alloys

In order to produce high-efficiency motors at relatively low production costs, a layered block is made from amorphous iron sheets. From the block, stator and rotor cores of a test switched reluctance motor (SRM) are fabricated. The experimental results of the test machine are compared to another test machine made from low iron loss silicon steel type 35A300 in JIS standard. This silicon steel is equivalent to M-22, 300, and V300-35A in ANSI, BS601, and DIN46400, respectively. The validity of the test results is compared and verified through use of an analytical simulation software package. Approximately 6% improvement in efficiency is observed for the prototype SRM with the layered amorphous core material. The SRM test motor has an efficiency of 95.1% at a speed of 8500 r/min with an output of 2.4 kW.     

High‐Efficiency Motors Using Soft Magnetic Cores

We have developed a small and highly efficient axial gap motor whose stator core consists of a soft magnetic core. First, the loss sensitivities to various motor design parameters were evaluated by magnetic field analysis. Low sensitivity to the pole number and core dimensions ( ? 2.2 dB) was found for the total loss, which is the sum of the copper loss and the iron losses in the stator core and the rotor yoke. From this we concluded that to improve the motor efficiency, it is essential to reduce the iron loss in the rotor yoke and to minimize the other losses. With this in mind, a prototype axial gap motor was manufactured and tested. The motor has four poles and six slots. The motor is 123 mm in diameter and the axial length is 47 mm. The rotor has parallel magnetized magnets and a rotor yoke with magnetic steel sheets. The maximum measured rotor efficiency is 93%. This value roughly agrees with the maximum calculated efficiency of 95%.     

Design Method for Improving Motor Efficiency of Switched Reluctance Motor

The motor efficiencies of switched reluctance motors (SRMs) are inferior to those of permanent magnet synchronous motors. This paper describes a design procedure for an SRM to obtain a higher motor efficiency. The first step in the design procedure makes clear the principle for improving the motor efficiency. The cross‐sectional and axial shapes of the rotor and stator cores are designed by magnetic field analysis with the two‐dimensional (2D) and 3D finite element method. A high‐efficiency SRM with 12 stator poles and eight rotor poles is designed. The designed SRM was produced experimentally, and was tested to verify its performance. The motor efficiency was improved in comparison to the standard SRM with six stator poles and four rotor poles.     

Demonstration of loss reduction effect of 66 kV‐classed 30 MVA three phase hybrid‐core transformer by trial manufacture

To realize larger‐capacity “Hybrid‐core transformer: HBT”, this research has assembled a 30‐MVA three‐phase trial HBT and evaluated the loss performances. The hybrid‐core consisting of the wound amorphous‐ and the stacked silicon steel‐cores, is expected having advantages of lower iron loss of the iron‐based amorphous material and the higher mechanical strength and saturation magnetic flux density of the silicon steels simultaneously. Three‐dimensional finite‐element method analysis revealed that the silicon steel core prevented over‐saturation of the amorphous core. The hybrid configuration enabled the design to have an approximately 10% higher magnetic flux density than configurations with only an amorphous core. We then assembled a prototype 30‐MVA three‐phase HBT designed on the basis of our investigation results. Operation tests demonstrated that the HBT has 62%‐reduced iron loss and 0.10%‐higher 50%‐loaded power efficiency from the conventional silicon steel core transformer.     

一种采用取向硅钢片的新型同步磁阻电机

同步磁阻电机（SynRM）结构简单、稳定可靠,但转矩和功率因数偏低,在过载运行下转子导磁桥和定子齿等磁通流经关键位置的硅钢片会逐渐饱和,使得电机发热增多,输出转矩降低。本文提出一种新型同步磁阻电机(NSynRM),通过在电机转子导磁桥表面增加使用取向硅钢片以及在定子齿部替换使用取向硅钢片来解决原电机中磁密饱和带来的问题。同原电机中的硅钢片相比,取向硅钢片在轧制方向具有高磁导率和高饱和磁密的特点,因此在新型同步磁阻电机中使取向硅钢片轧制方向沿着直轴磁场流通方向,能够使磁通沿着取向硅钢片顺利流通,增加电机的抗饱和能力。计算结果表明,新型同步磁阻电机在过载运行条件下,具有更大的转矩和功率因数,能有效降低电枢绕组温升,提高能量利用率。电机的电磁性能计算通过有限元软件完成。     

Research on motor with nanocrystalline soft magnetic alloy stator cores

We built a prototype motor with NANOMET stator cores. NANOMET is one of the several nanocrystalline soft magnetic alloys [1]. The motor iron loss and other characteristics of NANOMET were compared with 35A360, which is one of the widely used conventional electromagnetic steel sheets, and the effectiveness of the new material is shown. This paper describes the methods to build NANOMET stator cores, and presents the evaluation results of the prototype motor.