Modeling and Design of a Novel 5-DOF AC–DC Hybrid Magnetic Bearing

Round 1

Reviewer 1 Report

 

The paper addresses an interesting design of a hybrid radial and axial magnetic bearing with an angular air gap.  Potential for a good paper, but several things need to be addressed as follows:

 

1.     A couple of references by co-authors of the current paper are omitted and are listed below.  Please include these and provide clear information on what is new in the proposed paper over these previous publications:

 

Zhang, Tao, et al. "Modeling and performance analysis on the five degrees of freedom slice hybrid magnetic bearing." IEEE Transactions on Applied Superconductivity 29.2 (2018): 1-5.

 

Zhu, W., et al. "A novel five-degree-of-freedom AC-DC hybrid magnetic bearing." AIP Advances 10.1 (2020): 015034.

 

 

2.     The following paper the author addresses coupling issues between x and y direction because of 3-pole radial AMB design.  Please include this as a reference and comment on how your work accounts for or eliminates this type of coupling.  Please also translate this for the case of adding a Z (axial) component.

 

Zhang, Weiyu, and Huangqiu Zhu. "Radial magnetic bearings: An overview." Results in physics 7 (2017): 3756-3766.

 

3.     Why is the axial air gap angular?  Could it be “flat” to provide for the Z-axis gap? 

4.     Please be clear in one of your figures as to what is meant by the “left” and “right” permanent magnets in Section 3.1 for consistency. 

5.     Please add a figure that better shows how the model in Figure 3 actually links to the physical system (it is hard to clearly deduce this from the earlier figures).

6.     Figure 8 is difficult to read.  More explanation is needed on what each of the curves mean

7.     Figure 9 and 10 are difficult to understand.  Please add more explanatory text as to what these figures are describing.

8.     Nomenclature table needed so equations can be followed more easily

9.     English needs some improvement

10.  Always introduce, or refer, to a figure in the text before showing the figure.

Author Response

Please see the attachment.

Author Response File: Author Response.docx

Reviewer 2 Report

Modeling and Design of a Novel 5-DOF AC-DC Hybrid Mag netic Bearing

By

 Xiaoting Ye , YiMing Yan  , ChunLai Jia  and Tao Zhang ,*

Authors investigated a novel integrated AC-DC hybrid magnetic bearing (HMB) to reduce the volume, weight, manufacturing and operation cost of the magnetic suspension motor. One axial MB and two radial MBs are integrated in the proposed HMB. The five degrees of freedom (5-DOF) suspension is realized in one unit. The axial and radial bias fluxes are provided by two axially polarized permanent magnets.

Comments

1.      Abstract and Conclusions are is not written well, for eg. a) In conclusions, Establish a 3-D finite element model and compare with the equivalent magnetic circuit method does’t give any meaning.  b) In abstract, “suspension force production mechanism are introduced” is not correct.

2.      In section 2, under the title HMB Topologies and Principal, the content written does not suit to the title.

3.      Section 3 title is Mathematical model, not Mathematic Model. In several places of the manuscript,  mathematical is written as Mathematic

4.      In line no. 197, Magnetic density should be written as Magnetic flux density

5.      Novelty of the paper is not clearly mentioned in the Introduction.

6.      In Figure 6, variation of force with current is not represented clearly.

Author Response

Please see the attachment.

Author Response File: Author Response.docx

Round 2

Reviewer 1 Report

Your answers to my questions in your cover letter/response were excellent.  However, you didn't add all of this information to the paper!  For example, include wording in your paper as to how your work is different than the new references.  You did this well in your cover letter/response, now please include that in your paper.  Once this is done, it will better showcase your work and novel design choices.

Author Response

Answers: The authors thank helpful comments! We have added the information to the manuscript. We have used yellow text to indicate changes in the manuscript. Thanks a lot.

Reviewer 2 Report

Authors included all revisions suggested by the reviewer in the revised manuscript.

Author Response

The authors thank to the reviewer for the approval of the paper.