Full Text:   <1938>

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CLC number: TM351

On-line Access: 2016-08-05

Received: 2015-07-24

Revision Accepted: 2016-02-17

Crosschecked: 2016-07-13

Cited: 0

Clicked: 1855

Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

He Hao

http://orcid.org/0000-0001-6376-9106

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Frontiers of Information Technology & Electronic Engineering  2016 Vol.17 No.8 P.814-824

10.1631/FITEE.1500238


Torque characteristics in a large permanent magnet synchronous generator with stator radial ventilating air ducts


Author(s):  He Hao, Wei-zhong Fei, Dong-min Miao, Meng-jia Jin, Jian-xin Shen

Affiliation(s):  College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China; more

Corresponding email(s):   w.fei@cranfield.ac.uk

Key Words:  Permanent magnet synchronous generator (PMSG), Radial ventilating air duct, Torque ripple, Step skewing, Magnet shape optimization, Finite element analysis, Wind power


He Hao, Wei-zhong Fei, Dong-min Miao, Meng-jia Jin, Jian-xin Shen. Torque characteristics in a large permanent magnet synchronous generator with stator radial ventilating air ducts[J]. Frontiers of Information Technology & Electronic Engineering, 2016, 17(8): 814-824.

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A1 - He Hao
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A1 - Jian-xin Shen
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Abstract: 
In this study, we investigated the torque characteristics of large low-speed direct-drive permanent magnet synchronous generators with stator radial ventilating air ducts for offshore wind power applications. magnet shape optimization was used first to improve the torque characteristics using two-dimensional finite element analysis (FEA) in a permanent magnet synchronous generator with a common stator. The rotor step skewing technique was then employed to suppress the impacts of mechanical tolerances and defects, which further improved the torque quality of the machine. Comprehensive three-dimensional FEA was used to evaluate accurately the overall effects of stator radial ventilating air ducts and rotor step skewing on torque features. The influences of the radial ventilating ducts in the stator on torque characteristics, such as torque pulsation and average torque in the machine with and without rotor step skewing techniques, were comprehensively investigated using three-dimensional FEA. The results showed that stator radial ventilating air ducts could not only reduce the average torque but also increase the torque ripple in the machine. Furthermore, the torque ripple of the machine under certain load conditions may even be increased by rotor step skewing despite a reduction in cogging torque.

有定子径向通风孔的大型永磁同步发电机的转矩特性

目的:针对应用于海上风电的大型低速直驱型永磁同步发电机,研究具有径向通风风道定子和分段斜极的转子对于电机转矩特性的影响。
创新点:利用二维和三维有限元分析,得到定子通风孔的存在对于电机转矩特性的影响,并且通过对永磁体结构和转子分段斜极的优化,得到其对电机转矩特性的影响,提高电机转矩性能,降低了对机械齿轮的要求。
方法:首先,考虑到大型直驱型永磁同步发电机采用的机械齿轮的机械忍耐性受到限制,因此减少电机的转矩脉动具有非常重要的意义,对于海上工作的风力发电机来说尤为如此。接着,针对现有风力发电机,在具有定子通风孔条件下提出了对于电机永磁体形状的优化,并通过二维和三维的有限云分析,得到了其对电机转矩特性的影响。然后,通过提出对电机转子的分段斜极的优化,同样利用二维和三维的有限元分析得到不同转子结构对电机转矩特性的影响。最后,通过分析比较得到不同结构对电机平均转矩、转矩脉动等的影响。
结论:针对大容量永磁同步发电机,我们发现定子通风孔不仅会降低电机的平均转矩,还会增加电机的转矩脉动,且电枢电流和转子分段斜极对减少电机的转矩脉动具有非常大的影响。

关键词:永磁同步发电机;径向通风孔;转矩脉动;分段斜极;磁体形状优化;有限元分析;风电

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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