An Improved Shape of Stator Pressboard for Loss and Temperature Reduction in the End Region of Large Water Filling Submersible Motor

doi:10.11985/2016.07.002

Abstract

Abstract:

Due to the complex leakage electromagnetic field in the large submersible motor, it is difficult but also important to calculate the loss and temperature of the motor end region precisely. In this paper, the three dimensional (3D) coupled magnetic-thermal analysis model of submersible motor end region was established. The eddy current field and the magnetic field distribution were obtained by the finite element method, and the characteristics of the temperature distributions of the end structures were also analyzed. The eddy current of the pressboard as well as the surface loss of the end shield and frame was evaluated. Based on the electromagnetic analysis of end region, an improved shape of the stator pressboard was proposed for loss and temperature reduction. Finally, both the loss and temperature distributions of the end structures were compared in detail between the improved and the original. The results indicated that motor with improved stator pressboard could reduce both the loss and temperature-rise of the end region for water filling submersible motor. The useful conclusions could provide a reference for further optimization designs of large water filling submersible motors.

Key words: 3D eddy current field, coupled magnetic-thermal analysis, end region, temperature distribution, water filling submersible motor

CLC Number:

TM346

Xiaohua Bao,Na Liang,Yong Fang,Fuying Li. An Improved Shape of Stator Pressboard for Loss and Temperature Reduction in the End Region of Large Water Filling Submersible Motor[J]. Journal of Electrical Engineering, 2016, 11(7): 9-17.

Figures/Tables 13

References 21

[1]	Vasilios S Lazarns, Antonios G Kladas, Athanassions G Mamalis , et al. Analysis of end zone magnetic field in generators and shield optimization for force reduction on end windings[J]. IEEE Transactions on Magnetics, 2009,45(3):1470-1473. doi: 10.1109/TMAG.2009.2012682
[2]	Ranran Lin, Ari Haavisto, Antero Arkkio . Validation of a time-harmonic numerical model for solving magnetic field in end region of a radial-flux machine[J]. IEEE Transactions on Magnetics, 2009,45(12):5360-5367. doi: 10.1109/TMAG.2009.2022934
[3]	Yong Fang, Xiaohua Bao, Qiang Lv , et al. Analysis of electromagnetic force distribution on end winding of electrical submersible motor during starting transient operation[J]. IEEE Transactions on Magnetics, 2013,49(10):5341-5345. doi: 10.1109/TMAG.2013.2263285
[4]	Yong Fang, Qiang Lv, Xiaowei Cheng, et al. Analysis of stress distribution on end winding of large water filling submersible motor during steady state operation[C]. 5th International Conference Power Electronic Systems and Applications, 2013: 1-6.
[5]	Andrej Stermecki, Oszkar Biro, Imam Bakhsh , et al. 3D finite element analysis of additional eddy current losses in induction motors[J]. IEEE Transactions on Magnetics, 2012,48(2):959-962. doi: 10.1109/TMAG.2011.2173919
[6]	Jichao Han, Weili Li, Likun Wang , et al. Calculation and analysis of the surface heat-transfer coefficient and temperature fields on the three-dimensional complex end windings of a large turbogenerator[J]. IEEE Transactions on Industrial Electronics, 2014,61(10):5222-5231. doi: 10.1109/TIE.2013.2297293
[7]	Ranran Lin, Ari Haavisto, Antero Arkkio . Axial flux and eddy-current loss in active region of a large-sized-squirrel-cage induction motor[J]. IEEE Transactions on Magnetics, 2012,46(11):3933-3938. doi: 10.1109/TMAG.2010.2064782
[8]	Jibin Zou, Bo Zhao, Yongxiang Xu , et al. A new end windings transposition to reduce eddy current loss for a 2MW direct drive multi-unit PMSM[J]. IEEE Transactions on Magnetics, 2012,48(11):3323-3326. doi: 10.1109/TMAG.2012.2201701
[9]	Ranran Lin, Ari Haavisto, Antero Arkkio . Analysisi of eddy-current loss in end shield and frame of a large induction machine[J]. IEEE Transactions on Magnetics, 2010,46(3):942-948. doi: 10.1109/TMAG.2009.2031173
[10]	Henry M Hamalainen, Juha Pyrhonen, Hanne Nerg , et al. 3D finite element method analysis of additional load losses in the end region of permanent-magnet generators[J]. IEEE Transactions on Magnetics, 2012,48(8):2352-2357. doi: 10.1109/TMAG.2012.2190741
[11]	Wang Likun, Li Weili, Xue Yi , et al. Influence of clamping plate permeability and metal screen structures on three-dimensional magnetic field and eddy current loss in end region of a turbogenerator by numerical analysis[J]. Journal of Applied Physics, 2013,42(19): 193904-193904-8.
[12]	Yingying Yao, Haixia Xia, Guangzheng Ni , et al. 3D eddy current analysis in the end region of a turbogenerator by using reduced magnetic vector potential[J]. IEEE Transactions on Magnetics, 2006,42(4):1323-1326. doi: 10.1109/TMAG.2006.871941
[13]	K Yamazaki, S Tada, H Mogi , et al. Eddy current analysis considering lamination for stator core ends of turbine generators[J]. IEEE Transactions on Magnetics, 2008,44(6):1502-1505. doi: 10.1109/TMAG.2007.916246
[14]	Feiyang Huo, Weili Li, Likun Wang , et al. Numerical calculation and analysis of three-dimensional transient electromagnetic field in the end region of large water-hydrogen-hydrogen cooled turbogenerator[J]. IEEE Transactions on Industrial Electronics, 2014,61(1):188-195. doi: 10.1109/TIE.2013.2244542
[15]	Weili Li, Chunwei Guan, Zheng Ping . Calculation of a complex 3D model of a turbogenerator with end region regarding electrical losses, cooling, and heating[J]. IEEE Transactions on Energy Conversion, 2012,26(4):1073-1080. doi: 10.1109/TEC.2011.2161610
[16]	Feiyang Huo, Weili Li, Likun Wang , et al. Influence of copper screen thickness on three-dimensional electromagnetic field and eddy current loss of metal parts in end region of large water-hydrogen-hydrogen -cooled turbogenerator[J]. IEEE Transactions on Industrial Electronics, 2013,60(7):2595-2601. doi: 10.1109/TIE.2012.2196906
[17]	Weili Li, Jichao Han, Feiyang Huo , et al. Influence of the end ventilation structure change on the temperature distribution in the end region of large water-hydrogen-hydrogen cooled turbogenerator. IEEE Transactions on Energy Conversion, 2013,28(2):278-288.
[18]	Likun Wang, Feiyang Huo, Weili Li , et al. Influence of metal screen materials on 3D electromagnetic field on eddy current loss in the end region of turbogenerator[J]. IEEE Transactions on Magnetics, 2013,49(2):939-945. doi: 10.1109/TMAG.2012.2212026
[19]	Youguang Guo, Jianguo Zhu, Wei Wu . Thermal analysis of soft magnetic composite motors using a hybrid model with distributed heat sources[J]. IEEE Transactions on Magnetics, 2005,41(6):2124-2128. doi: 10.1109/TMAG.2005.848316
[20]	Aldo Boglietti, Andrea Cavagnino, David Staton , et al. Evolution and modern approaches for thermal analysis of electrical machines[J]. IEEE Transactions on Industrial Electronics, 2009,56(3):871-882. doi: 10.1109/TIE.2008.2011622
[21]	Martin Hettegger, Bernhard Streibl, Oszkar Biro , et al. Measurements and simulations of the convective heat transfer coefficients on the end windings of an electrical machine[J]. IEEE Transactions on Industrial Electronics, 2012,59(5):2299-2308. doi: 10.1109/TIE.2011.2161656

Item	Specification
Rated power/kW	2 800
Rated voltage/kV	10
Connection type	Y
Outer diameter of stator core/mm	850
Inner diameter of stator core/mm	445
Number of pole pairs	2
Number of stator slots	60
Number of rotor slots	47
Number of conductors per slot	8
Number of parallel branches of stator winding	1

Zones	Loss of original model /W	Loss of improved model /W
End shield and frame	199.84	91.13
Pressboard	288.32	65.53
End winding	15.32	15.31
Bar	0.74	0.61

Item	Temperature of original model		Temperature of improved model
Item	Maximum value/(℃)	Average value/(℃)	Maximum value/(℃)	Average value/(℃)
Pressboard	60.7	56.8	59.9	55.5
End winding	54.8	52.7	54.3	52.3
Stator	55.1	54.9	55.0	54.8
Rotor	56.2	54.2	56.2	54.1