Y/△起动时感应电动机的瞬态电流和电磁转矩  

The transient current and torque of induction motor at Ｙ/△ starting

作　　者：汤晓燕[1] 

机构地区：[1]沙洲工学院,江苏张家港215600

出　　处：《电机与控制学报》2001年第4期220-224,共5页Electric Machines and Control

摘　　要：从感应电动机的基本方程出发，导出起动电流的表达式；然后利用电动机的状态方程和数值方法实例计算了２台三相感应电动机Ｙ／△起动时的动态过程，得到了最不利切换时刻的瞬态电流和转矩峰值；最后讨论了几种影响瞬态电流和转矩峰值的因素，得到了一些有用的结论。From the basic equation of induction motor, the expression of starting current is derived at first, then the Ｙ/△ starting process is calculated for two induction motors using the state equations and numerical method. The peak value of transient stator line current and electromagnetic torque at the improper switching instant from Ｙ to△ are obtained. Finally, factors influencing the stator line current and electromagnetic torque are discussed. Results show that the maximum peak value of switching current from ■ to△ can exceed the peak value of A connected starting current.

关 键 词：感应电动机 Y/△起动 瞬态电流 电磁转矩 

分 类 号：TM346[电气工程—电机]