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Posted - Feb 23 2022 :  12:41:55  Show Profile  Reply with Quote
When I use FastHenry to caculate the inductance,I get a problem that the result of FastHenry's window is not the same as the output file Zc.mat.


The following is FastHenry input file

* FastHenry input file created using FreeCAD's ElectroMagnetic Workbench
* See ht*p://w*, ht*p://w* and ht*p://
.units mm
.default sigma=58000.0 nhinc=1 nwinc=1 rh=2 rw=2
* Nodes
NFHNode0 x=0 y=0.0 z=0.0
NFHNode1 x=0 y=100.000000 z=0.0

NFHNode2 x=1 y=0.0 z=0.0
NFHNode3 x=1 y=100.000000 z=0.0

NFHNode4 x=2 y=0.0 z=0.0
NFHNode5 x=2 y=100.000000 z=0.0

* Segments
EFHSegment0 NFHNode0 NFHNode1 w=0.200000 h=0.200000
EFHSegment1 NFHNode2 NFHNode3 w=0.200000 h=0.200000
EFHSegment2 NFHNode4 NFHNode5 w=0.200000 h=0.200000
* Ports
.external NFHNode0 NFHNode1
.external NFHNode2 NFHNode3
.external NFHNode4 NFHNode5
.freq fmin=1.000000 fmax=1.000000 ndec=1.0



The follow ing is result of FastHenry's window

filling R and L...
Total Memory allocated: 64 kilobytes
Frequency = 1
Forming sparse matrix preconditioner..
conductor 0 from node nfhnode4
Calling gmres...
1 2 3
conductor 1 from node nfhnode2
Calling gmres...
1 2
conductor 2 from node nfhnode0
Calling gmres...
1 2 3

Computed matrices (R+jL)
Row 0: nfhnode0 to nfhnode1
Row 1: nfhnode2 to nfhnode3
Row 2: nfhnode4 to nfhnode5
Freq = 1
Row 0: 0.0431034+1.34278e-07j -1.85793e-26+8.61664e-08j -1.29247e-26+7.25019e-08j
Row 1: -1.37325e-26+8.61664e-08j 0.0431034+1.34278e-07j -8.07794e-27+8.61664e-08j
Row 2: -1.45403e-26+7.25019e-08j -6.46235e-27+8.61664e-08j 0.0431034+1.34278e-07j

All impedance matrices dumped to file Zc.mat

Times: Read geometry 0.134
Multipole setup 0.298
Scanning graph 0.033
Form A M and Z 0.052
form M'ZM 0
Form precond 0.0349998
GMRES time 0.549
Total: 1.101

The following is the content in Zc.mat

Row 3: nfhnode4 to nfhnode5
Row 2: nfhnode2 to nfhnode3
Row 1: nfhnode0 to nfhnode1
Impedance matrix for frequency = 1 3 x 3
0.0431034 +8.43692e-07j -1.85793e-26 +5.41399e-07j -1.29247e-26 +4.55543e-07j
-1.37325e-26 +5.41399e-07j 0.0431034 +8.43692e-07j -8.07794e-27 +5.41399e-07j
-1.45403e-26 +4.55543e-07j -6.46235e-27 +5.41399e-07j 0.0431034 +8.43692e-07j

I have no idea why they not the same......

ChiaChen Hu


4 Posts

Posted - Feb 23 2022 :  12:50:46  Show Profile  Reply with Quote
I'm sorry about that I ask a stupid question.
I check the "Help" document and know why it happen.

ChiaChen Hu
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