异步电动机液体变阻器软启动控制设计  

Soft Start Control Design for the Liquid Rheostat of Asynchronous Motor

作　　者：徐腊梅[1] 贺平平[1] 陈彦龙 

机构地区：[1]武汉理工大学自动化学院,湖北武汉430070 [2]武钢矿业公司灵乡铁矿,湖北大冶435100

出　　处：《武汉理工大学学报（信息与管理工程版）》2011年第3期411-413,共3页Journal of Wuhan University of Technology：Information & Management Engineering

摘　　要：交流异步电动机在启动时的启动电流是正常运行电流的5～7倍,过大的启动电流会对供电电网产生不利的冲击,影响设备的正常运行。为减小电动机启动时产生的冲击电流,提出了液体变阻器软启动的控制方法,通过改变串接在转子回路中的液体变阻器的电阻,使其阻值随启动时间的增加而减少,从而调整启动时间和启动电流,并获得较高功率因数和最佳启动转矩。The initial firing current of AC asynchronous motor in the starting time is 5-7 times of that in normal operation.The oversized start current exerts the disadvantageous impact on the power supply electrical network,and affects normal operation of the equipment.A control method named liquid rheostat resistance ＂soft start＂ was proposed to reduce impulse current generated in period of motor starting.The resistance of liquid rheostat which was concatenated in rotor loop was controllable.It reduces with start time increasing;thus starting time and initial firing current are controllable.The high power factor and the best starting torque can be obtained.

关 键 词：异步电动机 软启动 液体变阻器 功率因数 启动转矩 

分 类 号：TM301.2[电气工程—电机] TM343