A Novel Double-Sided Offset Stator Axial-Flux Permanent Magnet Motor for Electric Vehicles

Round 1

Reviewer 1 Report

The paper is well written and presented, however, the following enhancement is required:

1. Include 3D results from the FE analysis
2. Temperature analysis is required to check the saturation and thermal effects while the machine is under operation
3. Include the vibrations and acoustic analysis, to be more sure about the proposed geometry/design
4. Authors should include more detailed illustrations about the loss calculations and clearly state the assumptions wherever take. Loss analysis can be supported through a 3D graph. 

Also add more relevant and recent references.

Author Response

Dear reviewer,

Please see the attachment

Han

Author Response File: Author Response.docx

Reviewer 2 Report

Dear authors, I have some remarks to your (very good) paper:

line 47/48 and 63 - note: an offset rotor approach for DSSR is discussed also in:

Kremer, M.: Electromagnetic design of a disc rotor electric machine as integrated motorgenerator for hybrid vehicles. Dissertation, Université de Haute-Alsace, 2016., Page 46/47 "Teeth alignment"

line 58: could you specify the application field of this motor, e.g. for traction in an EV or aviation? Are there specifications for this motor design, e.g. torque / assembly space, or is it a fundametal research?

line 73: the 4th harmonic (8-pole field) from an ideal 9-slot single stator as depicted in Fig. 1 is typically more significant than the 5th harmonic - but equation (4) and 2.2.2 show identical winding factors for 4th and 5th harmonics. Could you explain that or is there a special reason for this? - And in Fig. 5 (a), FEM results show a less significant 4th harmonic.

line 156: maybe some key figures like surface thrust could be named and compared to other concepts like the yasa motor in [15] to classify the result

line 163: comparing the EMF peak values is not suitable here - when the torque of DOSSR is 10% less than DSSR, the EMF (fundamental) should show the same ratio! But less flux linkage means less stator inductance and less voltage demand also, and DOSSR EMF is much more sinusoidal.

line 227/228: see above

line 249 (Conclusion) Outlook: is it intended to realize the motor and to validate the results?

 

Author Response

Dear reviewer,

Please see the attachment.

Han

Author Response File: Author Response.docx

Round 2

Reviewer 1 Report

Thanks for incorporating my comments. The paper now looks more meaningful.

Please see the formatting once.