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Introduction With the development of science and technology, frequency converter was widely used for its good speed performance and reliable modulation efficiency in high speed electric spindle.
Table 1 is the materials properties of electric spindle.
Tab.1 Materials properties of electric spindle Stator winding Stator/rotor core Rotor bar Ceramic shaft Metal shaft material copper wire selenium steel  cast aluminum (75C0) ceramic steel relative permeability 0.999991 BH curve 1.000021 1×10-12 BH curve Electrical conductivity [S/m] 58000000 —— 23000000 1×10-5 2000000 Density[kg/m3] 8933 7820 —— 3200 7872 Fig.1 Ceraminc electric spindle Fig.2 2 D finite element model of electric spindle Fig.3 Coupling SPWM model Simulation Result and Analysis The distribution of core loss, solid loss and stranded loss of ceramic electric spindle are shown in figure 4, 5 and 6 when the carrier ratio is 15.
[2] Shuanan Weng: submitted to Journal of Electrotechnics(1996), Vol.3:p8-p9
[3] Jun Wang: submitted to Journal of Industrial Technology(2011), Vol.39 (2) ,p104-p105

Material properties of steel are shown in Table 2.
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China Civil Engineering Journal, 2012, 45(1):61-68
Journal of Shenyang Construction University, 2005(3): 196-199

The vertical strengthening body is customarily called pile(including rigid pile and flexible pile), while the horizontal strengthening body refers to various reinforced materials, and geogrid reinforced cushion is one of them.
ACKNOWLEDGMENTS This work was financially supported by Zhejiang Provincial Natural Science Foundation of China (Grant No.
Journal of Building Structures, 25(2004), p.125-129 (in Chinese)
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Materials and Methods.
Garcia-Celma, Nano-emulsions, Current Opinion in Colloid & Interface Science. 10 (2005) 102-110
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Lowry, Effect of kaolinite silica fines and pH on transport of polymer-modified zero valent iron nano-particles in heterogeneous porous media, Journal of Colloid and Interface Science. 370 (2012) 1–10

Physical Design and Parameters Determination of Bubble Generator of Cyclonic Static Micro-bubble Flotation Column Baoqing Dai1,a, Xinying Liu2,b , Jianjun Yuan1,cand Aiying Zou3,d 1Department of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Taian271000, PR China 2Department of Information Engineering, Shandong University of Science and Technology, Taian271000, PR China 3Department of Resources and Civil Engineering, Shandong University of Science and Technology, Taian271000, PR China aemail:dbq1961@163.com; bemail:xinying0@aliyun.com; cemail:yjj502@126.com; demail:kdzouay@163.com Keywords: bubble generator, flotation, jet flow, ore pulp, medium Abstract.
Introduction Flotation is an important technology in resource recycling, almost all the minerals can be separated and processed by flotation, and these minerals can be processed into secondary resource and useful materials.
Journal of China University of Mining & Technology.Vol.4(2005)p, 462 .
Journal of China University of Mining & Technology.
Journal of China University of Mining & Technology.

The annual operation and maintenance cost includes the cost of materials and water, wages of workers and welfare funds, withholding funds for overhaul, loan interest of circulating fund and other charges.
Acknowledgements This work is partially supported by Humanities and Social Sciences Foundation of Chinese Ministry of Education (10YJC790360).
Journal of China Coal Society, Vol. 34 (2009), p. 1435-1440(in Chinese) [8] Li Ming, Lu Xuhua.
Journal of Wuhan University of Science and Technology (Natural Science Edition), Vol. 30 (2007), p. 434-437(in Chinese) [9] Bao Nengsheng, Zhu Ruidan, Ni Weidou..Gas Turbine Technology.
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Magnetic materials and devices, 2011 (1): 59-61
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Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Science, Russian Federation, Moscow 119991, Leninskij av. 31, Tel/Fax +7 (095) 954-41-26, 2 Institute for High Energy Densities, "IVTAN" Association, Russian Academy of Science, Russian Federation, Moscow 125412, Izhorskaya st. 13/19 a v_sevastyanov@mail.ru , brpavelko@yandex.ru, cezhovyus@mail.ru Keywords: Transport, thermodynamic scanning, SiC+SiO2, chemical vapour transport, SiC nanocrystal growth.
Lee: "Continuous Synthesis of Silicon Carbide Whiskers", Journal of Materials Science, Vol. 30 (1995), p. 1982 [2] Motojima and M.
Hasegawa: "Chemical Vapor Growth of β-SiC Whiskers From a Gas Mixture of Si2Cl6-CH4-H2-Ar", Journal of Crystal Growth, Vol. 87 (1988) p. 311 [3] H.
Koumoto: "Morphology and Stacking Faults of β-Silicon Carbide Whisker Synthesized by Carbothermal Reduction", Journal of American Ceramic Society, Vol. 83 (2000) p. 2584 [5] V.G.

College of Mechanical Science and Engineering, Jilin University, Changchun 130022, China 2.
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Acknowledgements This work was financially supported by Natural Science Foundation of Shandong Province(ZR2012EEL29), Colleges and Universities Science and Technology Project of Shandong Province(J12LG04), Natural Science Foundation of Shandong Jiaotong University(Z201241).
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