Dynamics modeling and electromechanical coupling characteristics analysis of cage induction motors  

作　　者：ZHOU ZiWei CHEN ZaiGang ZHAI WanMing 

机构地区：[1]State Key Laboratory of Rail Transit Vehicle System,Southwest Jiaotong University,Chengdu 610031,China

出　　处：《Science China(Technological Sciences)》2024年第3期709-724,共16页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos. 52022083, 52275132)。

摘　　要：Induction motors, as typical electromechanical energy conversion devices, have received limited attention in previous studies on electromechanical coupling vibrations, precise modeling, and the use of electromechanical coupling effects for fault diagnosis and condition assessment in motor drive systems. This study proposes a comprehensive model of cage induction motors that integrates the multiple coupled circuit model with a rotor-bearing dynamics model. The model accounts for the linear increase in the magnetomotive force across the slot and incorporates the skidding characteristics of bearings in the rotor-bearing system. By calculating the time-varying mutual inductance parameters based on the air-gap distribution in the vibration environment, the electromechanical coupling vibration of the cage motor is investigated. Furthermore, this study examines the electromechanical coupling vibration characteristics influenced by various factors, including bearing clearances, radial loads, and the vertical excitation frequencies of the stators. The results show that the proposed model improves the excitation inputs for the electrical and mechanical systems of the motor compared with conventional models. Increased bearing clearance and radial load affect the current and torque similarly but have opposite effects on the slip ratio. This study provides a deeper understanding of electromechanical coupling mechanisms and facilitates the use of such phenomena for fault diagnosis and condition assessment in motor-driven systems.

关 键 词：cage induction motors rotor-bearing dynamics mutual inductance electromechanical testing current signal analysis 

分 类 号：TM343[电气工程—电机]