# An Investigation of Parameter Dimension Reduction Optimization of PMA-Synrm
## 5 Conclusions  
This paper is based on a 7.5 kW, 1500 rpm permanent magnet-assisted synchronous reluctance motor. The motor rotor is composed of five layers of magnetic barriers and five layers of ferrite. The design parameters of the motor rotor are as high as 26. The multi-objective genetic algorithm is used to optimize the design of the motor. The specific conclusions of this paper and future research work are as follows:  
* In this paper, by analyzing the influence of the design parameters of the rotor magnetic barrier on the main output performance of the motor, considering the convenience of the actual processing of the motor, a parameter dimension reduction optimization design method is proposed. Using this method, the optimization parameters of the permanent magnet-assisted synchronous reluctance motor can be reduced from 26 to 7, which greatly improves the optimization efficiency of the permanent magnet-assisted synchronous reluctance motor and realizes the comprehensive global optimization design of the permanent magnet-assisted synchronous reluctance motor. The optimization design method can provide a reference for motor designers to a certain extent;
* At present, the motor is developing in the direction of \"no rare earth, light rare earth\". The permanent magnet-assisted synchronous reluctance motor, as a motor only assisted by ferrite, is in line with the current development trend. Moreover, the size of the permanent magnet-assisted synchronous reluctance motor in this paper mainly refers to the same power asynchronous motor. After design and optimization, the efficiency and other performance indicators of the permanent magnet-assisted synchronous reluctance motor can fully reach the IE5 energy efficiency level. Therefore, it is necessary to conduct more in-depth research on the permanent magnet-assisted synchronous reluctance motor to achieve higher efficiency.  
Conceptualization, Z.L.; data curation, Z.L. and G.Z.; formal analysis, Z.L. and G.Z.; funding acquisition, Z.L.; investigation, Z.L. and G.Z.; methodology, Z.L. and G.Z.; project administration, Z.L.; resources, Z.L.; software, G.Z.; supervision, G.D.; validation, Z.L., G.Z. and G.D.; visualization, G.Z.; writing--original draft, Z.L.; writing--review and editing, Z.L., G.Z. and G.D. All authors have read and agreed to the published version of the manuscript.  
This research received no external funding.  
**Institutional Review Board Statement:** Not applicable.  
**Informed Consent Statement:** Not applicable.  
**Data Availability Statement:** Data are contained within this article.  
**Conflicts of Interest:** The authors declare no conflicts of interest.  
\begin{table}
\begin{tabular}{c c c c} \hline
**Parameter** & **Predicted Value** & **Simulative Value** & **Measurement** \\ \hline Output power (kW) & 7.50 & 7.50 & 7.52 \\ Rated-load current (A) & 13.3 & 13.4 & 13.5 \\ No-load back EMF (V) & 77.52 & 77.37 & 76.10 \\ Power factor & 0.914 & 0.910 & 0.905 \\ Efficiency (\%) & 94.15 & 94.10 & 94.06 \\ \hline \end{tabular}
\end{table}
Table 9: The optimization results of permanent magnet-assisted synchronous reluctance motor are compared with finite element results.