【作者】 邵永实； 郭德胜； 高强； 徐殿国；

【Author】 Shao Yongshi,Guo Desheng,Gao Qiang,Xu Dianguo(Department of Electrical Engineering, Harbin Institute of Technology, Harbin 150001, China)

【机构】 哈尔滨工业大学电气工程系；

【摘要】 离散变频软启动延用传统的软启动器结构,通过降低输出电压的频率,来提高电机的启动转矩,克服了传统软启动器不能带重载启动的弊端,但离散变频软启动不一定能在任意分频数下都提高启动转矩。本文通过对离散变频下感应电机的启动转矩进行定量的分析,提出了离散变频软启动只能利用3n+1分频作为离散变频的启动频率,并算出了3n+1分频下电机启动转矩有可能达到的最大值。通过实验与降压软启动进行比较,证明了离散变频软启动提高了软启动器的带载能力。更多还原

【Abstract】 Using the power circuit of traditional soft-starter, Discrete Variable Frequency (DVF) improved the starting torque of soft-starter by decreasing the frequency of output voltage, therefore, overcame the shortage of traditional soft-starter which could not start induction motor with heavy load. But DVF may not improve the starting torque under any sub-multiples of line frequency. This paper proposed, with quantitative analysis, that DVF should only use those 3n+1 submultiples of line frequency, and calculated the maximum starting torque of induction motor on DVF. Comparison was done with traditional AC thyristor starter, and the result proved that DVF can improve the starting ability of soft-starter with heavy load.更多还原