Coast-Down Modeling of Canned Motor Based on Torque Behavior Study  

作　　者：薛亚波 姚振强 成德 沈洪 李孟超 

机构地区：[1]School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, China [2]State Key Laboratory of Mechanical System and Vibration, Shanghai 200240, China [3]Harbin Electric Power Equipment Co. Ltd., Harbin 150040, China

出　　处：《Journal of Shanghai Jiaotong university(Science)》2015年第4期420-426,共7页上海交通大学学报（英文版）

基　　金：the National Basic Research Program(973)of China(Nos.2009CB724308 and 2015CB057302);the National Key Technology Research Project(Nos.2010ZX06001-13 and 2013ZX06002002-017)

摘　　要：The coast-down behavior is specially designed to satisfy the certain flow requirements in a special kind of canned motor pump when it is used in primary reactor coolant system. However, coast-down models once used are not suitable for designing ultra-large canned motor pumps with flywheels, in which case rotor's fluid resistance of canned motor is modeled by an empirical constant. When the size of canned motor increases, the error of empirical relationship becomes remarkable. In thrall to material's density and strength, flow resistance of coast-down behavior should be dynamically modeled accurately to reduce the demands of materials. In this paper, an improved analytical model is proposed to study barbell-like canned motor's coast-down characteristic based on basic torque behavior researches in Taylor-Couette flow and hydraulic coupler, where bearing's resistance is ignored. This model takes geometric and kinematic parameters into consideration. In addition, the influence of pressure and temperature is coupled into this coast-down model by using Reolands' viscosity relationship.Based on this model, coast-down behavior is studied and parameters sensitivity analysis is conducted from design view point. Parameters sensitivity analysis indicates that the density and distribution of materials have more remarkable influence on coast-down behavior compared with working condition and geometric parameters.The coast-down behavior is specially designed to satisfy the certain flow requirements in a special kind of canned motor pump when it is used in primary reactor coolant system. However, coast-down models once used are not suitable for designing ultra-large canned motor pumps with flywheels, in which case rotor＇s fluid resistance of canned motor is modeled by an empirical constant. When the size of canned motor increases, the error of empirical relationship becomes remarkable. In thrall to material＇s density and strength, flow resistance of coast-down behavior should be dynamically modeled accurately to reduce the demands of materials. In this paper, an improved analytical model is proposed to study barbell-like canned motor＇s coast-down characteristic based on basic torque behavior researches in Taylor-Couette flow and hydraulic coupler, where bearing＇s resistance is ignored. This model takes geometric and kinematic parameters into consideration. In addition, the influence of pressure and temperature is coupled into this coast-down model by using Reolands＇ viscosity relationship.Based on this model, coast-down behavior is studied and parameters sensitivity analysis is conducted from design view point. Parameters sensitivity analysis indicates that the density and distribution of materials have more remarkable influence on coast-down behavior compared with working condition and geometric parameters.

关 键 词：canned motor pump coast-down behavior Taylor-Couette(TC) flow torque behavior theoretical model 

分 类 号：TH69[机械工程—机械制造及自动化]