designandimplementationofavariablefrequencyregulatorysystemforwatersupply-外文文獻(xiàn)-資料下載頁(yè)
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【導(dǎo)讀】916188. David1.Chan. TsingYiIsland. HongKong. Phone:(852)24368660andFax:(852)24368643. VVujiuLi. 1900ShiTeiRoad. Slhanghai. China. Phone:(86)2165422319andFax:(86)2165167921. ABSTRACT. INTRODUCTION. pumps.morereliable.PRINCIPLEOFOPERA,TION. .Thepressuresensor(PS)transducesthewater. pressureinpipestoe
【正文】 e zP is proportional to the square of the motor speed, n2, it is dso proportional to the square of the supply frequency, f2. To a electric motor, the torque 7, is equal to C,$,12cosa, where C, is a constant, $, is the magic flux of rotating field, l2 is the rotor current, and cosa is the power factor of rotor circuit. I2 normally cannot exceed its rated value, so 7, = 41,. If the voltage drop in the stator is negligible, $, will be proportional to supply voltage V. In order to maintain zP = 7, the supply voltage V should be required to be proportional to the square of the frequency, f*. Therefore, the characteristic of V versus f should be set to be a quadratic relationship. CONCLUSION This type of variable frequency constant pressure closed loop system for water supply was designed and implemented in Shanghai, China. The performance was proven satisfactory. A copy of a photograph of this system was shown in Fig. 5. All four advantages of this proposed system were fully realized. This system is one of tlhe energy saving methods in tall building design. 2097 REFERENCES Wang Y., Kong X., Feng S., and Qi X., 1995, “Study on Using Serial Pipe to Improve the Dynamic Response of ElectroHydraulic Speed Control System,” Chinese Journal of Mechanical Engineering (English Edition), Vol. 8, No. 3, pp. Dajun D., 1995, “State of the Art of the Construction and Design of and Research on Tall Buildings in the People’s Republic of China,” The Structural Design of Tall Buildings, 209214 Vol. 4, NO. 3, pp. 241261. Kong X., et al, “Experiment Study on Using Pipe Effect to Improve the Response Capacity of ElectroHydraulic Position Control System,” in Zhao A., ProCeedings of Chengdu 90ICFPCR, Chengdu University of Science and Technology, 1990, Chengdu University of Science and Technology Press. Wilson ., Hoff ., and Hall C., 1995, “Water Movement in Porous Building Materials XI11 : Absorption into a TwoLayer Composite,” The International Joumal of Building Science and Its Applications, Vol. 30, No. 2, pp. 209 220. Fig. 5 : Photograph of the 3 pump Water Supply System in China 209
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