Design and Optimization of a PMSM for Obtaining High-Power Density and High-Speed

Abstract

It is very important to obtain high power in a small volume for many applications. Especially, power/weight (W/kg) ratio needs to be well balanced in electric and aircraft vehicles, military and robotic applications. High power density can usually be obtained with a magnet-assisted motor. However, it is very difficult in terms of design for the motor to have both high power and low weight. Therefore, motor design should be supported by a good optimization. In this study, Multi-Objective Genetic Algorithm (GA) is used to obtain high power and low weight. Thus, targets are achieved by both optimizations at the same time. Rotor inner diameter, stack length, magnet insert, magnet thickness, and magnet angle are optimized in this paper. The motor is designed as 24 slots and 16 poles. 1100 generations are obtained by optimization and it has been decided that 1092th generation is the most suitable motor. Hence, motor having approximately 8 kW output power and 1.3 kg rotor mass is designed. The motor efficiency is obtained about 97% when friction and ventilation losses are neglected. As a result, it is observed that designed PMSM with high-power density and high speed can be used in the robotic and military applications.

Keywords

• Optimization
• High Power Density
• Genetic Algorithm
• Motor Design
• Permanent Magnet Synchronous Motor

References

1. Referans 1 Zhong L, Rahman M.F, Hu W.Y, Lim K.W. Analysis of direct torque control in permanent magnet synchronous motor drive. IEEE Trans Power Electron 1997; 12(3): 528–536.
2. Referans 2 Yildirim M, Polat M, Kurum H. A survey on comparison of electric motor types and drives used for electric vehicles. In 2014 16th International Power Electronics and Motion Control Conference and Exposition; 21-24 Sept. 2014; Antalya, Turkey, pp. 218–223.
3. Referans 3 Yildirim M, Kurum H, Miljavec D, Corovic S. Influence of Material and Geometrical Properties of Permanent Magnets on Cogging Torque of BLDC. Engineering, technology & applied science research 2018; 8(2): 2656-2662.
4. Referans 4 Mutluer M, Bilgin O. Design optimization of PMSM by particle swarm optimization and genetic algorithm. In 2012 International Symposium on Innovations in Intelligent Systems and Applications; 2-4 July 2012; Trabzon, Turkey, pp. 1–4.
5. Referans 5 Seadati S.A.S, Niasar A.H. Optimal design and finite element analysis of a high speed, axial-flux permanent magnet synchronous motor. In 2018 9th Annual Power Electronics, Drives Systems and Technologies Conference; 13-15 Feb. 2018; Tehran, Iran, pp. 133–138.
6. Referans 6 Sadeghi S, Mohammadpour A, Parsa L. Design optimization of a high performance five-phase slotless PMSM. In 2014 International Symposium on Power Electronics, Electrical Drives, Automation and Motion; 18-20 June 2014; Ischia, Italy, pp. 6–11.
7. Referans 7 Cvetkovski G, Petkovska L. Multi-objective optimal design of permanent magnet synchronous motor. In 2016 IEEE International Power Electronics and Motion Control Conference; 25-28 Sept. 2016; Varna, Bulgaria, pp. 605–610.
8. Referans 8 Zhu, W, Yu Z, Zhou W, Shi J, Yin Y. Design of permanent magnet synchronous motor based on genetic algorithm in unmanned ground vehicles. In 2017 IEEE International Conference on Unmanned Systems (ICUS); 27-29 Oct. 2017; Beijing, China, pp. 572–575.

9. Referans 9 Hejra M, Mansouri A, Trabeisi H. Optimal design of a permanent magnet synchronous motor: Application of in-wheel motor. In 2014 5th International Renewable Energy Congress; 25-27 March 2014; Hammamet, Tunisia, pp. 1–5.
10. Referans 10 Gao J, Zhang W. Improved genetic optimization algorithm with subdomain model for multi-objective optimal design of SPMSM. -CES Journals & Magazine 2018; 20(1): 160-165.
11. Referans 11 Ishikawa T, Nakayama K, Kurita N, Dawson F.P. Optimization of Rotor Topology in PM Synchronous Motors by Genetic Algorithm Considering Cluster of Materials and Cleaning Procedure. IEEE Trans Magn 2014; 50(2): 637–640.
12. Referans 12 Onsal M, Demir Y, Aydin M.A. New Nine-Phase Permanent Magnet Synchronous Motor With Consequent Pole Rotor for High-Power Traction Applications. IEEE Trans Magn 2017; 53(11): 1–6.
13. Referans 13 Lei Z, Xuhui W, Jian Z, Youlong W. Research of high power-density permanent magnet synchronous motor and driving system. In 2011 International Conference on Electric Information and Control Engineering; 15-17 April 2011; Wuhan, China, pp. 6052–6055.
14. Referans 14 Fang S, Liu H, Wang H, Yang H, Lin H. High power density PMSM with lightweight structure and high-performance soft magnetic alloy core. IEEE Trans App. Supercond 2019; 29(2): 1-5.
15. Referans 15 Chasiotis I.D, Karnavas Y.L. A Study on Design and Optimization of High Power Density PMSM for Pod Propulsion System. In 2018 XIII International Conference on Electrical Machines; 3-6 Sept. 2018; Alexandroupoli, Greece, pp. 534–540.
16. Referans 16 Ullah S, Winterborne D, Lambert S.M. Next-generation integrated drive: A high power density permanent magnet synchronous drive with flooded stator cooling. J Eng 2019; 2019(17): 4231–4235.
17. Referans 17 Aydogmus O, Boztas G. Control and design of a high power density PMSM. Mechatronics 2017; 644: 273-280.