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1、长定子用互补型模块化磁通切换型永磁直线电机优化设计 Design Optimization of a Complementary and ModularLinear Flux-Switching Permanent Magnet Motor for LongStator Applications#510152025303540Cao Ruiwu1, Cheng Ming1, Hua Wei1, Wang Xin1, Zhao Wenxiang2* 1. School of electrical engineering, Southeast University, NanJing 210096;
2、2. School of Electrical and Information Engineering, Jiangsu University,JiangSu ZhenJiang 2172021 Abstract: This paper investigate the design optimization of a new modular linear flux-switchingpermanent magnet MLFSPM motor with complementary, symmetrical and modular structure andcompare its performa
3、nce with the conventional linear flux-switching permanent magnet LFSPM . Thekey of the proposed structure is that each phase armature winding is composed of two coils whosepositions are mutually one half of the stator pole pitch and there are flux barrier between the twoadjacent “E models. Hence, th
4、e back-EMF waveform of each phase is sinusoidal and the three phasemagnet circuits are symmetrical. We first optimize the design and analyze the electromagneticperformance of the proposed MLFSPM motor by means of finite element method FEM . Then, thestructure of the conventional LFSPM motor is also
5、optimized and then compared with the proposedmotor based on the same method. The results reveal that the proposed motor has sinusoidal andsymmetrical three-phase back-EMF waveforms, smaller cogging force, and smaller force ripple thanthe existing motors. Moreover, a prototype of the proposed motor i
6、s built to validate the study.Keywords: Linear motor; permanent magnet motor; flux-switching; modular0 IntroductionLinear motors produce a direct thrust force without the need of conversion from rotationaltorque to linear force. Therefore, they are ideal for rail transportation systems1-5. Theconven
7、tional linear permanent-magnet synchronous motor LPMSM exhibits higher efficiencyand higher power density than linear induction motors6. However, in applications with a longstator, such as in urban rail systems, the conventional LPMSM inevitably results in significant costincrease due to a large amo
8、unt of magnets or armature windings set along the long stator. Linearswitched reluctance motors LSRM has a simpler and more rugged structure, and a lower systemcost than direct-drive LPMSM due to its simple stator, which only consists of iron7. However,this motor also suffers from the drawbacks such
9、 as higher torque ripples and lower power densitythan the PM motors as in the rotary structure8. Hence, how to incorporate the merits of bothhigher power density and simpler, lower cost long stator has attracted more and more attentions. Inrecent years, a new kinds of primary PM linear motors9-14, n
10、amely the linear structure ofstator-PM motors15: doubly salient permanent magnet DSPM motors16, flux reversalpermanent magnet FRPM motors17, and flux-switching permanent magnet FSPM motors18have attracted wide attentions, in which both the permanent magnets and the armature windingsare placed in the
11、 same short primary mover, while the long secondary stator is only made of iron.Hence, this kind of linear PM motors incorporate the merits of simple structure of linear inductionFoundations: This work was partially supported by National Natural Science Foundation of China under Projectof 50907031,
12、the Specialized Research Found for the Doctoral Program of Higher Education of China underProject of 20210092110034, the Program for Postgraduate Research Innovation in General Universities of JiangsuProvince 2021 under Project of X10B_066Z，and the Scientific Research Foundation of Graduate School o
13、fSoutheast University.Brief author introduction:Cao Ruiwu, 1980- , Male, Phd. Candidate, His research interests include design,analysis, and control of permanent-magnet machines.Correspondance author: Cheng Ming, 1960- ,Male, Professor, Doctoral advisor,His teaching and researchinterest include elec
14、trical machines, motor drives for electric vehicles, and renewable energy generation. E-mail:mcheng-1-motors, LSR motors and high power density of LSPM motors, which are perfectly suited for longstator application systems.It has been shown that the FSPM motor can offer high power density19, 20, sinu
15、soidalback-EMF, and fault-tolerance capabilities21, 22, as compared with the DSPM motor. So the455055606570linear structure of FSPM motor is investigated in this paper. Fig. 1 shows a rotary 12/14-poleFSPM motor.Its operation principle and electromagnetic performance are investigated and compared witha 12/10-pole FSPM motor in 23-24. The results show that its output torque is much higher andits torque ripple is much smaller than the 12/10-pole FSPM motor. Hence, a liner FSPM motorbased on the 12/14-pole rotary FSPM motor will be investigated in this paper.
