船用高速异步电机转子导条楔紧结构及力学分析

Structure and Mechanical Analysis of Wedge-Tight Rotor Bar in Marine High-Speed Asynchronous Machine

船用高速异步机发电机转子导条受电磁力、热应力、离心力、焊接残余应力等综合作用,容易产生松动甚至断条,同时也将增加转子的振动噪声,给电机稳定运行带来较大风险。通过优化导条和端环结构及紧固工艺是改善导条应力水平的有效途径,对此分析了不同导条结构及受力特点,并提出一种导条超速楔紧改进方法,仿真及实测结果表明,提出的方法能提高楔紧量,进而有利于降低转子断条风险。

The rotor guide bars of marine high-speed asynchronous generators are subjected to the combined effects of electromagnetic force, thermal stress, own centrifugal force, welding residual stress, etc., which are prone to breakage or looseness. At the same time, it will increase the vibration and noise of the rotor and effect the stable operation of the motor. Optimizing the structure of the guide bar and the end ring and the fastening process is effective to decrease the stress of the guide bar. In this regard, the force characteristics of different guide bars and end ring structures are summarized, and an over-speed wedge tightening method is proposed. The mechanical analysis and test results show that the proposed method can not only improve the tightness, but also reduces the risk of broken rotor bars.