循环泵屏蔽电机定子端部温升过高数值计算

为研究环流使屏蔽电机端部出现温升过高的异常现象,以一台5 000 k W的循环泵屏蔽电机为例,基于电磁场和温度场的基本理论,建立电机三维电磁场和温度场的数学模型,采用有限元方法,对电机端部磁密、温升大小及分布进行计算和分析,明确环流是产生电机端部磁密过高及温升异常的的直接原因。通过研究定子齿压板及锥形环有环流分布及切断环流分布两种方案下磁场及温度场的分布规律,改进了齿压板的连接结构,使局部最高温度由230℃降低至175℃,从而解决了温升过高的问题。本研究可以对大容量电机在生产实践中安全稳定地运行,减少和杜绝安全隐患提供参考价值。

Numerical calculation on overheat of stator end region of circulating pump canned motor

To investigate the high temperature abnormal phenomenon caused by circulating current of canned motor at the end region, a 5000 kW canned induction motor is taken as an example. A mathemat-ical model of 3-D electromagnetic and temperature field was established based on the electromagnetic field and temperature field theory. Through the calculations and analysis of magnetic density and the distribu-tion of temperature, concluding that the circulating current is the direct reason why the magnetic density at motor end is too high and the temperature rise is abnormal. After the study of the distribution of the e-lectromagnetic field and temperature field between two schemes that with circulating current and no circu-lating current between finger plate and cone-ring, a new connecting scheme was provided which made the temperature reduce from 230 ℃ to 175 ℃. Overheating problem at the motor 's end was resolved. This study gives a reference for larger capacity motor to release and cut off the incipient fault under the produc-tive practice, and ensures the motor running safely and steadily.