为什么3D不能查看矢量磁位

ayu

本人想按照唐任远老师的《现代永磁电机理论与设计》第二版P.109的矢量磁位法求端部漏磁系数，建立了电机3D模型，静态场仿真完毕却发现场计算器中没有矢量磁位选项，查看场图也没有该选项。2D模型中则矢量磁位选项正常显示。

请教各位，（1）这是什么原因；（2）如果用该方法求取端部漏磁系数，应该如何取得相关矢量磁位？

godbless

顶一下吧，我也想知道

yttdays

将模型发上来，看看呀

zengxiaodong

三维磁场计算不用矢量磁位，用标量磁位（或者基于单元边）。


下面是Ansys的论述：


○2-D static magnetic analysis, analyzing magnetic fields caused by direct current (DC) or permanent magnets. A 2-D static analyses use a magnetic vector potential (MVP) formulation. See 2-D Static Magnetic Analysis (p.13) in this manual for more information.

○ 2-D harmonic magnetic analysis, analyzing magnetic fields caused by low frequency alternating current (AC) or voltage. Permanent magnets are not permitted.This type of analysis uses an MVP formulation. For details about this analysis type, see 2-D Harmonic Magnetic (AC) Analysis (p.51).


○2-D transient magnetic analysis, analyzing magnetic fields caused by arbitrary electric current or external field that varies over time. Permanent magnet effects also can be included.This analysis type uses an MVP formulation.2-D Transient Magnetic Analysis (p.77) describes this analysis type in detail.

○3-D static magnetic analysis, analyzing magnetic fields caused by direct current (DC) or permanent magnets using a magnetic scalar potential (MSP) formulation. See 3-D Static Magnetic Analysis (Scalar Method) (p.93) for more information.

○ 3-D static magnetic analysis, analyzing magnetic fields caused by direct current (DC) or permanent magnets using an edge-based formulation.3-D Magnetostatics and Fundamentals of Edge-Based Analysis (p.117) describes this type of analysis in detail.

○3-D harmonic magnetic analysis, analyzing magnetic fields caused by low frequency alternating current (AC), using an edge-based formulation. Permanent magnets are not permitted.The edge-based formulation is recommended for most harmonic magnetic applications. See 3-D Harmonic Magnetic Analysis (Edge-Based) (p.145) for a description of this analysis type.

○ 3-D transient magnetic analysis, analyzing magnetic fields caused by arbitrary electric current or external field that varies over time, using an edge-based formulation. Permanent magnet effects also can be included.The edge-based formulation is recommended for most transient magnetic applications.3-D Transient Magnetic Analysis (Edge-Based) (p.173) discusses edge-based transient analysis.

什么是标量磁位？
The magnetic scalar potential (MSP) formulation, considered a node-based method, is recommended for most 3-D static analysis applications.The scalar approach allows you to model current sources as primitives rather than elements; therefore, the current sources do not need to be part of the finite element mesh.The scalar method offers the following:
○ Brick, wedge, pyramid, and tetrahedral element geometries
○ Current sources defined by primitives (coils, bars, and arcs)
○Permanent magnets
○ Linear and nonlinear permeability
○ Node coupling and constraint equations
In addition, modeling of current sources (current conducting regions) is simpler with the scalar formulation.This is so because you can simply specify current source primitives (coils, bars, and so forth) in the proper locations to account for their magnetic field contribution.

什么是矢量磁位？
The magnetic vector potential (MVP) formulation is another node-based method, but for 2-D analyses. It has a single magnetic vector potential degree of freedom, AZ, at each node.With the MVP formulation, you model current sources (current conducting regions) as an integral part of the finite element model.

zengxiaodong

For the scalar potential formulation, you can use three different analysis methods: Reduced Scalar Potential (RSP), Difference Scalar Potential (DSP), and Generalized Scalar Potential (GSP).The type of model you are analyzing determines which method is best to use:

1、 If the model contains no iron regions, or if it has iron regions but does not have current sources, use the RSP method.Do not use the RSP method when the model has both iron regions and current sources, because numerical cancellation errors may produce an inaccurate solution.
2、 If you cannot use the RSP method, choose between DSP and GSP .The DSP method is available for models with "singly connected" iron regions, and the GSP method is for models with a "multiply connected" iron region.

zengxiaodong

如果不是用节点自由度，而是用基于边的自由度来求解三维磁场问题，那就更加另当别论了！

ANSYS_2020R1_低频电磁分析指南.rar (3.95 MB, 下载次数: 9)

2020-2-22 22:27 上传

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ayu

zengxiaodong 发表于 2020-2-22 22:26
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好久没上论坛了，迟来的衷心感谢