双笼高压电动机断条的分析及改进

电厂辅机传动笼型电动机转子故障统计表明,笼条断裂是最常见的。从起动到运行中笼所受到的应力分析表明,笼条和端环受到各种脉动性质的电动,热和机械应力。对笼材料的疲劳强度作了试验。并做出许用应力极限的讨论。最后,文章提出了提高电动机可靠性的措施并附有实例。

The Analysis and Improvement on Broken Bar in H.V. Double Cage Motor

From the statistics of rotor failures in cage induction motors in power plant auxiliary drives, the bar failure counts the most frequent ones. The analysis on the cage stresses from start to running condition shows, that the bars and rings suffer from different sorts of electrodynamic, thermal and mechanical stresses, most of which are pulsatory. The fatigue strength test of the cage material has been done and the limits for use are discussed. Finally, the measures to be taken to improve the reliabity of the motor and some concrete examples are presented.