460V60Hz三相异步电动机在380V50Hz电网上运行的研究

Study of the Operation of 460V 60Hz Three—Phase Asynchronous Motors Connected to 380V 50Hz Electric Network

本文分析三相异步电动机在非额定电压和频率下运行的一般情况,推导出电动机运行特性随电压、频率和负载变化的一般表达式。针对460V60Hz三相异步电动机在380V50Hz电网上运行这一持例进行分析,指出了电动机在这种情况下运行特性变化的范围,以及应注意的问题。

On the basis of the theory of the electrical machine and its design,the general performance of three-phase asynchronous motors under non-rating voltage and frequency is first analysed, from which the general formulae of the motor characteristics changing with voltage, frequency and load are derived. Then an exceptional case of the operation of 460V 60Hz three-phase asynchronous motor connected to 380V 50Hz electric network is analysed,the changing range of motor performance and characteristics in this case and the question are printed out.