请教solidloss和stranded deep下载loss的区别

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如还有疑问请联系新浪客服:致电[转载]第一篇&关于ansoft的损耗计算
MAXWELL分析磁场时,电气设备或电气元件(无论是电机还是变压器)主要包括两个部分,一个是励磁线圈,另外一个是磁性材料。所以总的损耗包括线圈损耗(也叫铜损)和磁芯损耗(也叫铁损)两个部分。其中线圈损耗还包括直流损耗(也就是直流电阻的损耗)和交流损耗(交流电流下的趋肤效应和邻近效应产生的损耗),这个交流损耗也叫做涡流损耗,在涡流场和瞬态场中可以通过设置EDDY
EFFECTS来计算。而铁损只能在瞬态场中计算。铁损的计算,主要是由磁芯材料供应商提供的各种频率和工作磁感应强度下的测试数据为基础,使用STEINMETZ方程式,采用插值法得到的。这个铁损已经包含了磁芯的所有损耗,即:磁滞损耗,涡流损耗和剩余损耗。铁损的计算分两种,一种主要是软磁铁氧体(POWER
FERRITE),另外一种主要是矽钢片(ELECTRICAL STEEL),两种计算公式不同。
SOLIDLOSS(实体导体损耗)是指任何导体材料的损耗,既可以包含源电流,又可以有涡流电流。
SOLID CONDUCTOR(实体导体)又包含两种,一种是主动导体,即有外加电流的导体,另外一种
是被动导体,即没有外加电流。被动导体又有两种情况,短路和开路。定子和转子其实就是被动导体
,当然有涡流存在,也就是一种SOLIDLOSS。其实应该还有一种导体损耗,DISPLACEMENT
(位移电流),但是通常都很小,一般用于交变电场分析,磁场中很少用。
三、关于powerloss和coreloss
四、关于永磁体的铁耗计算
.什么状况下应该给永磁体设置电导值?
&&象钕铁硼等导电的永磁材料,
并要考虑永磁体中涡流的影时,要设置电导率.
2 .什么状况下给永磁体加上【set Eddy effects】?
& &要计算永磁体中的涡流的影响时,应设置.
3.又在什么状况下给永磁体赋上【零电流】
&&由于电机轴向长度有限, 并且单块永磁内涡流自成回路,
因此永磁体截面上的电流有正向和负向,
&并且正、负电流之和应等于零。要正确计算永磁体中的涡流,应将每块永磁体赋【零电流】。
4,若希望准确算额定转矩,应该怎么设置?(也可以同时说说硅钢片怎么设置)
&理论上讲,要准确计算额定转矩,应考虑永磁体中的涡流,即设置:电导率、
【set Eddy effects】、【零电流】。但硅钢片不应设置电导率和【set Eddy effects】,
因为2D有限元是模拟轴向有一定长度的电磁问题,不能模拟很薄的硅钢片中的涡流问题,
这个问题是三维问题。
5. 若希望准确计算齿槽转矩,应该怎么设定?(也可以同时说说硅钢片怎么设置)
齿槽定位力矩一般是指低速下的值,因此不因考虑永磁体和硅钢片中的涡流。
6.若希望算表面贴磁的永磁电机的永磁体涡流损耗,应该怎么设定?(也可以同时说说硅钢片
怎么设置)永磁体应按上面4. 中说的设置,硅钢片应将电导率设为零,不考虑硅钢片中涡流。
我的理解是这样的:在计算瞬态场时,铁耗的计算由材料的特性得到,set core
loss的选项上
要在铁芯上勾对号。铁心分转子铁心和定子铁心,因为定子铁心为叠片式的默认为无涡流损耗,所
以不加set eddy effects。而转子铁心是一个solid,所以要加set eddy effect计算涡流损耗。在
显示损耗时,转子损耗在soildless里,定子损耗在coreloss里。当绕组为solid时,solidloss加入
绕组中eddy effects 效应之后的损耗。当绕组设为stranded时不存在这样的损耗。当铁芯
勾set eddy effects的选项时,solidloss为默认铁芯不是叠片式而是solid时的铁芯损耗。
这显然要比coreloss要大的多。
以上网友发言只代表其个人观点,不代表新浪网的观点或立场。Photoenhanced ozone loss on solid pyrene films.
- PubMed - NCBI
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2009 Sep 28;11(36):7876-84. doi: 10.j. Epub
2009 Jun 10.Photoenhanced ozone loss on solid pyrene films.1, , , , .1Department of Chemistry, University of Toronto, Toronto, Ontario, Canada M5S 3H6.AbstractThis work presents the results of two complementary studies of the heterogeneous reaction of gas-phase ozone with solid pyrene films. In the first study, ozone uptake by the pyrene film was determined using a coated-wall flow tube system. In the second, pyrene loss within the film upon exposure to ozone was monitored using a laser-induced fluorescence technique. The dependence of the reactive loss rate on ozone concentration observed in both methods suggests that the reaction proceeds via a Langmuir-Hinshelwood-type surface mechanism. At a mixing ratio of 50 ppb, the steady-state reactive uptake coefficient of ozone by pyrene films increased from 5.0x10(-6) in the dark to 3.7x10(-5) upon exposure to near-UV radiation (300-420 nm). The uptake coefficient increased linearly as a function of UV-A spectral irradiance and decreased markedly with increasing relative humidity. The loss of surface pyrene upon exposure to ozone also displayed a light enhancement: analysis of Langmuir-Hinshelwood plots for the light and dark reactions revealed a small increase in the two-dimensional reaction rate in the presence of light (lambda&or=295 nm). This modest enhancement, however, was less significant than the corresponding enhancement in the loss of gas-phase ozone. In order to explain these observations, we present an integrated mechanism whereby the light-enhanced ozone uptake arises from the reaction of ozone with O2(1Sigmag+) formed via energy transfer from excited-state pyrene and the enhanced pyrene loss occurs via the formation of a charge-transfer complex between excited-state pyrene and adsorbed ozone. The disparity between surface- and gas-phase results underscores the important role that multifaceted strategies can play in elucidating the mechanisms of heterogeneous atmospheric reactions.PMID:
[PubMed - indexed for MEDLINE]
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External link. Please review our .forlink团队原创,转载请注明。
上一篇博客讲完了铁耗及涡流损耗的计算方法,现就铜耗问题,阐述如下。
铜耗分为2部分,一是主动导体产生的,比如异步和同步电机定子绕组;二是被动导体产生的,比如鼠龙式异步电机转子导条。主动导体一般是多股绞线(也就是stranded),被动导体一般是大块导体(solid)。它们分别对应stranded
loss(R)和solid loss。
主动导体损耗:需要设置导
forlink团队原创,转载请注明。
loss:这个名词,出现在11及之前的版本。指的是感应电流对应的铜耗。比如鼠笼式异步电机转子导条铜耗,永磁体涡流损耗等。在12及更高版本中,该名词已更名为Solidloss。
Solidloss:如上解释,出现在12及更高版本中,指的是大块导体中感应电流产生的铜耗。
Coreloss:铁耗。指的是根据硅钢片厂商提供的损耗曲线,求得的铁耗。
forlink团队原创,转载请注明。
良好的网格剖分,是利用电磁场有限元软件或程序进行电磁装备分析的前提和基础,这对于瞬态场和3D模型尤其如此。
静态场和涡流场都包含自适应求解过程,软件具有网格自加密能力,因此大多数情况下无须手动剖分,即可得到很好的网格。瞬态场网格必须手动剖分,初始网格(initial
mesh)质量很差。自适应网格为瞬态场提供了一个很好的思路
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