Effect of Generator Rotor Radial Deviation on the Unbalanced Magnetic Pull of 1000 MW Hydro-Generator Unit
, Jianwei Zhang 2, Xingxing Huang 3, Gaoqiang Chen 2, Zhengwei Wang 1,* and Congdong You 2
Round 1
Reviewer 1 Report
The article presents a numerical simulation of a radial deviation for a 1000 MW generator rotor. The presented results are interesting and useful for researchers, but the article must be reviewed for publication. The most important remarks:
1) There are no presented experimental data to validate the simulation, so, please adapt the abstract to reflect this fact.
2) The section 2.1 must be reviewed, because the (A-V,A) model (eq. (1)) contains the electric scalar potential V, not the motion speed. Equations (1)-(5) must be corrected and clearly explained.
3) Variable g from (10) is the airgap length and its inverse from (11) is the airgap permeance? Please, correct according to the electromagnetic vocabulary in SI system and verify the equations’ dimensionality.
Author Response
Please see the attachment.
Author Response File: 
Author Response.docx
Reviewer 2 Report
The article provides a theoretical study of the unbalanced electromagnetic force caused by the eccentric installation of the rotor of a high-power hydro-generator. The article may be of interest to researchers and designers of electrical machines, however, it is necessary to explain some points in more detail:
1) The authors write: “The basic dimensions and electrical parameters of the hydropower generator are shown in Table 1.”
Table 1 does not contain any dimensions. However, it would be instructive to add the main dimensions of the generator (inner and outer diameter of the stator, the length of the magnetic circuit, the air gap, the armature winding end part extension, etc.) to the article in the form of a table.
2) The authors write: “It is a three-phase synchronous induction generator with a stator outer diameter of more than 18 m, height approximating 5 m and rated power of 1000 MW.”
What does the term “synchronous induction generator” mean? Usually an "induction machine" is an electric machine without excitation winding and with a short-circuited squirrel cage on the rotor. Perhaps you meant “electrically excited synchronous generator” or “wound field synchronous generator”.
3) The term “magnetic induction” should not be used, but “flux density”.
4) What is the purpose of using a 3D FEM model if you are only modeling 2D eccentricity?
5) What is the purpose of using the AC current model, if the use of a magnetostatic model is usually sufficient to estimate the unbalanced force?
Author Response
Please see the attachment.
Author Response File: Author Response.docx
