基于分级变频的重载软起动系统  

Heavyload Soft Starting Based on Discrete Variable Frequency

作　　者：兰志杰[1] 张昌凡[1] 陈颖[1] 王明菊[1] 

机构地区：[1]湖南工业大学计算机系,湖南株洲412008

出　　处：《电机与控制应用》2007年第3期50-53,共4页Electric machines & control application

摘　　要：介绍了一种增大电机起动转矩的控制方法。它不改变传统软起动的主电路结构,通过控制晶闸管导通一个或多个半波时间,在电机端得到新生基频电压。由于新生基频电压相位生成有很多种方式,为了得到最优的生成系统,使转矩最大,考虑了3种系统下各次谐波对系统的影响,并通过仿真给出了结论。A control strategy was proposed to improve electromagnetic torque at starting. Based on the conventional main circuit of soft starters, the strategy defined the triggering instants of soft starters thyristors to include half cycles or partial half cycles of the AC power supply. The discrete variable frequency voltages applied to the motor were obtained. Owing to building manners of the phase were multiplex, to get the optimum system, three variable systems influenced by various subharmonics were considered, the simulation results was given.

关 键 词：电机 软起动 电磁转矩 分级变频 

分 类 号：TM301.2[电气工程—电机]