Electric Power Flow Control in Double Three-Phase Machines without Shift between Magnetic Axes

Round 1

Reviewer 1 Report

It is a fine and interesting work. It is well structured and presented. The English language is good and the work is presented in clear manner. 

In order to improve the quality of the paper it is advisable that all the symbols of the physical quantities and parameters that are used in the equations to have Italic format when they appear in the text. In the equations they are fine, but in the text should be Italic.

Additional comments:

1. Please explain why did you use two three phase windings without shifting instead a two three phase system with winding shifting? What is the benefit of the proposed system?

2. Is it possible to provide a photo of the setup in which all the connections are visible and the instruments in function? It will look more professional and close to the block diagram.

 

3. Could you please explain what is the reason for the phase current shift in the diagram of the phase currents for lower loadings in comparison to the rated load when there is no phase shift.

Author Response

The authors would like to thank the reviewer for his/her positive feedback and valuable comments. Responses to your comments are provided in the attached Microsoft Word document.

Author Response File: Author Response.docx

Reviewer 2 Report

The authors proposed control approach for six-phase machines specially designed as 6PH-ZS which is based on vector control principles, enabling independent control of direct- and quadrature-current components in both three-phase windings. The experimental setting and the results of the experimental verification are proposed, which should certainly be commended and considered as a contribution to the work.

The paper is clearly written and the results, especially the measurement results are correctly presented.

 Although the introduction is well accompanied by relevant references and the overview of the field is sufficiently done, I suggest the authors to highlight the contributions of the work more strongly. The advantages of the proposed strategy with 6PH-ZS are clearly stated, but I would ask the authors to highlight these advantages and write them in the form of scientific contributions. This especially applies to the observed mode of work, the so-called quasi-transformer regime. I believe that the importance of this regime has not been addressed enough.

In the text of the paper, I ask the authors to correct the way parameters and variables are written; eg line: 136,  lines: 143-153;  N, I, L, should be written with italic font to distinguish it from the text. This should be done in the entire text of the paper!

In the central part of the work, the presentation of the measurement results, the part related to the Quasi-transformer mode should be further evaluated, and the conclusion could be refined in the sense of being more concrete and supported by concrete numerical values.

Correct the typo in terms of putting a double punctuation mark after the abbreviation 6PH-ZS, line 12.

 

 I am not qualified to assess the quality of English in this paper. The authors tried to write in a technical writing style.

 

Author Response

The authors would like to thank the reviewer for his/her positive feedback and valuable comments. Responses to your comments are provided in the attached Microsoft Word document.

Author Response File: Author Response.docx