摘要
首先列出三相感应电动机起动、断电和重新投入电网时的运动方程，然后着重研究了定子断电后转子电流初值的确定和转子电流、转速、转角的解答，以及最不利的重合时间。最后实例计算了一台三相感应电动机在１／３额定负载和额定负载两种工况下运行时，瞬间断电和重合后电磁转矩和定子电流的冲击峰值，得到了一些有用的结论。
The equations of motion for three-phase induction motor at starting, absence of the supply and reclosing are fomulated at first, then the initial values of rotor current and the solution of rotor current and speed after absense of the supply are derived, and the improper instant of reclosing is determined. Finally, the peak values of reclosing transient electromagnetic torque and stator current are calculated for a induction motor under rated and 1/3 rated load. Results show that the maximum peak value of transient torque can exceed the peak val-ue of starting torque.
出处
《电机与控制学报》
EI
CSCD
北大核心
2001年第2期98-102,共5页
Electric Machines and Control
关键词
三相感应电动机
断电
电网运行
电磁转矩
reclosing transient
improper reclosing instant
induction motor
