Inductance analyzer needs to be restructured

[dmnewman3]

Inductance analyzer should be restructured to the following two analyzers:

• Flux Linkage Analyzer
• Inductance/Saliency Ratio Analyzer

The flux linkage analyzer should take a JMAG FEA-drawn machine as the problem and analyze it to result in flux linkage

The inductance/saliency analyzer should effectively post-process the flux linkage data to result in Ld, Lq, and saliency ratio.

[dmnewman3]

@npetersen2 @elsevers @Anvar-Khamitov @wchan29 @noguchi-takahiro

Please respond with your thoughts here. I'd like to get a plan in place before any action is started to address this issue.

[npetersen2]

@dmnewman3 I am also building an analyzer to do this inductance calculations for my project... it is working using FEMM for my buried PM rotor design using 6-phase multi-phase winding.

It seems like we should be able to use the same analyzer for both our needs.. But that means it will need to be more general... not sure if it is really worth it at this point.

[dmnewman3]

@npetersen2 That is good to know, I have things split up and the only thing I am getting caught up on is avoiding hard-coding the 3 phases. Are you hard coding the 6 phases into yours or are you doing it another way?

[npetersen2]

Yeah the phase number is tricky... One possible way is as follows: The user specifies three things:

1. num_of_phases
2. list of terminal circuit names ph1, ph2, ph3 etc.
3. Transform which converts phase vector into alpha-beta-zero vector

These are general and apply to 3 phase, 6 phase, etc.

Then, the flux linkage analyzer excites each phase in the list, gets the flux linkages, and returns the vector. The inductance analyzer uses the transform to convert to alpha-beta form and gives inductance matrix. It can also post process the alpha-beta inductance matrix into DQ values, etc.

[Anvar-Khamitov]

Yeah, I think this looks good. The user could specify key-value parameters in the form of a dictionary. Including phase names, the following may be the inputs:

• Location of JMAG FEA model (has to be created before calling this analyzer).
• Other parameters: speed, simulation settings (time and steps), an array of the names of the terminals/phases as defined in the circuit of the JMAG model, DC current.

The analyzer can then open the file, create a new study, set speed and simulation settings, excite one terminal at a time, and extract flux linkages.