Effective Position Control for a Three-Phase Motor

Round 1

Reviewer 1 Report

This paper deals with interesting and useful topics for motor position controllers. The paper is well organized overall, and the simulation results and the experimental results for the proposed method are in good agreement. I recommend that you revise the following: 1) All parameters in the equations should be defined. 2) Please rewrite Equation(27). 3) You need to show the graphs for position error without zooming in Figure 8, and 10. 4) The expected problems and limitations of the proposed method need to be explained.

Author Response

Dear reviewer, thanks for your recommendations:

All parameters and variables in the equations have been defined and detailed in the text. Equation (27) has been rewritten. Also, other equations have been reedited to avoid confusions, where: the parameters have been separated in equations (4), (5), (7), (23)…,(42). the parameters have been separated in Figures 4 and 5. δ has been replaced by λ in (46), (47) and (48). The graphs for position error (without zoom) in Figure 8 and 10 have been added. Employing higher bandwidth for the PD position regulator, produces faster controller but also the undesirable chattering phenomena in experiments, due that the interferences and noises are introducing to the system. If the bandwidth is minor, these noises are filtered, and consequently the problem is avoided.

Reviewer 2 Report

This paper develops an efficient proportional derivative (PD) position controller for three-phase motor drives which has been designed in frequency domain, employing the d-q synchronous rotating reference frame and the indirect vector control. The study is interesting, and experimental results are presented, which allow validating the proposed approach. The authors should answer the following remarks in order to improve some of the aspects of the manuscript,

Introduction Section. It must be improved and extended. In addition more references are required. The novelties and contributions of this paper with respect the state of the art must be further highlighted and stressed. The diagram shown in Fig. 1 is quite standard. The authors must detail the differences and contributions with respect other similar schemes. The paper lacks of a comparison of the method proposed against other standard methods such as DTC and FOC.

I hope a review of the paper based on these remarks can help to improve the paper quality.

Author Response

Effectively, as mentioned by the reviewer, the introduction needed an important improvement. This way, the Introduction section has been improved and extended focusing in position control of three-phase motors, doing a resume of the state of the art, consequently the references have been updated. The novelties and contributions are presented from the practical point of view, and , in this revision, these have been commented in properly way in the main (first) paragraph of the Introduction section. The Introduction section has been rewritten, focusing in position control of three-phase motors of other authors, and comparing our results with the others proposals (references). The diagram shown in Fig. 1 is one of the most employed Field Oriented Control (FOC) with Space Vector Pulse Width Modulation (SVPWM) for position control. The tandem FOC-SVPWM is very useful in the industry and it is easy to implement on microprocessor systems. The position and currents control algorithms can be replaced by other algorithms, i.e. advanced control algorithms. Direct Torque Control (DTC) can be replace to FOC, but typically produces higher ripple in electromagnetic torque, this way it produces oscillations in the output (real position), decreasing importantly the accuracy.

Reviewer 3 Report

Effective Position Control for three-phase motor

electronics-697967

English is generally good, three systematic mistakes repeated a few times: „due” without to…, e.g. „due that this technique gets…” instead of „due to the fact that this technique…” word order, e.g. „it can be obtained the following transfer function”, instead of „the following transfer function can be obtained”. „minor” instead of „small” or „., e.g. ”minor than 0.002 rad” instead of „less than 0.002 rad”, or „with minor overshoot” instead of „small overshoot”. A deeper analysis of the cited literature would be useful. As a result, it is not clear from the paper what findings of the authors are original, beyond the state-of-the art. To be honest, some of the cited journal articles belong to other topics, like, e.g., energy saving, optimum T/A control. I recommend to add journal papers related to the topic of the manuscript. Please check Eq-s (4) and (5): I think s is not needed. It would be good to know the behavior of the control for loads described by, for example, by fuzzy models, or alike. At least some qualitative comments would be useful. Then the reponse to disturbances could be estimated better.

 

Comments for author File: Comments.pdf

Author Response

Thank you very much for your help in grammar issues, every error has been corrected. As it is commented in the last part of the first paragraph (Introduction section), the presented proposal in this paper, takes this PD regulator presented in [3] and extends to the PMSM the experimental validation. Moreover, practical tuning recommendations for both three-phase motors (of several units of kW) are given and experimental comparatives between them are done. Thank you very much, as we have answered to the Reviewer2, the references have been updated and commented properly in the Introduction part. Let know you that the equations (4) and (5) are necessary to design the current PI controllers design (subsection 2.4). The position tracking in presence of load torque, provided by using this PD is considered as very good for us. The experiments that we have done in the platforms have used step type load disturbances, which are the most difficult load to compensate.

Round 2

Reviewer 1 Report

The authors have made improvements, and no further changes are required.

Reviewer 2 Report

The authors have improved the manuscript according to my suggestions