Thermal Mapping of a High-Speed Electric Motor Used for Traction Applications and Analysis of Various Cooling Methods—A Review

Round 1

Reviewer 1 Report

This review paper is dedicated to thermal design of traction motors with permanent magnets of the rotor. The authors pay special attention to comparing the cooling methods of such machines. However, there are some not clear points.

Comments to be addressed:
1. In the introduction part, please explain the term “thermal mapping”. Now it is not quite clear what you mean by using this term: just calculating the temperature field of the motor using FEM or something else? Maybe you can add an illustration with an example of thermal mapping?

2. In my opinion, the conclusions in the summary part are rather trivial and weakly correlate with the main content of the paper. Some conclusions were expected on the comparison of different cooling systems in the considered application.

3. About the diagram in figure 1: Please explain what are “Induction motors” in the “synchronous motors” class?

Also in your diagram you even mention Hysteresis motors that never used in traction application (at least the "pure" Hysteresis motors) but you don't mention, for example, wound rotor synchronous motors, synchronous homopolar motors with the excitation winding on the stator and synchronous reluctance motors that also can be used in traction applications.

4. About Table 1 “The comparison of motor design software”.
The reviewer used to apply SyR-e software (by Gianmario Pellegrino and others). This is Matlab and FEMM based software. Therefore, it has all features that FEMM software provides. I would like to note that graphical interface of SyR-e does not include all features. Some features are available only in text (Matlab script) interface. I can confirm that SyR-e supports such an option as "Import CAD files" (in dxf). Also, it provide analytical calculations for choosing the initial design of SynRM or PM motor for the FEM-based optimization (“synrmDesign(x,b)” and “FEAfix” buttons in "Main Data" tab).

Speaking about advantages and disadvantages of various software it would also be also instructive to highlight which types of motors can be evaluated using a specific software. For example, one of the major drawbacks of Motor-CAD is that it cannot evaluate certain types of motors, and this cannot be achieved even with using scripts: synchronous motors with a salient pole stator, synchronous reluctance motors with circular field barriers, homopolar synchronous motors with the excitation winding on the stator, permanent magnet assisted synchronous reluctance motors with U-shape field barriers etc.

Also, it would be instructive to note which software provides 3D-analysis of the magnetic field (for example, Comsol Multiphysics provides it, Motor-CAD does not it), thermal and mechanical analysis.

Author Response

Dear Reviewer,

Please see the attachment

regards

Author Response File: Author Response.docx

Reviewer 2 Report

-please add block diagram of the proposed research step by step ;;; what is the result of paper?;;;
-please add photo/photos of application of the proposed research/review ;;;; 
-please add sentences about future analysis;;;
-Please add labels to axes (Figures);;;; for example Fig. 2, 10
-references should be 2018-2021 Web of Science about 50% or more ;; 30 at least
-Please compare with other methods, justify. Advantages or Disadvantages different methods
for example about thermal imaging

1) Fault diagnosis of electric impact drills using thermal imaging, Measurement, Volume 171, 2021, 
https://doi.org/10.1016/j.measurement.2020.108815

Author Response

Dear Reviewer,

Please see the attachment

regards

Author Response File: Author Response.docx

Round 2

Reviewer 1 Report

I think the authors responded satisfactory all my comments.

Reviewer 2 Report

-Figure 4, 9, 10, 11, 17, 18, 20, 23 please add specific labels to axes OX and OY,
for example temperature of
Speed of 
etc.