摘要
针对离散变频技术调压调频的特点,提出了基于电动机失电残余电压的测速方法,推导出了转速计算公式,并进行了误差分析。最后,利用该测速方法对离散变频软起动频段切换,进行异步电动机的软起动全过程仿真。仿真结果表明,各频段切换平稳,满足了异步电动机高起动转矩软起动要求。
Based on characteristics of discrete variable frequency soft starting, a novel speed measuring method using residual voltage after AC dump was proposed, and its counting formula, analysis of errors were presented. At last discrete variable frequency soft starting by using this speed measuring method was simulated. The simulation results indicate that switching of discrete frequency bands is smooth, and discrete variable frequency soft starting with the speed measuring method can meet the need of soft starting for three-phase asynchronous motors with high stating torque.
出处
《低压电器》
北大核心
2007年第3期52-56,共5页
Low Voltage Apparatus
关键词
离散变频
软起动
仿真
失电残余电压
discrete variable frequency
soft starting
simulation
residual voltage after AC dump
