The goerges phenomenon-induction motors with unbalanced rotor impedances
The goerges phenomenon-induction motors with unbalanced rotor impedances
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转子阻抗不平衡的戈尔格斯现象感应电机
DOI：
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发表时间：
1950
期刊：
影响因子：
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通讯作者：
E. Gross
中科院分区：
文献类型：
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作者：
H. Garbarino;E. Gross
Goerges现象是三相绕线转子感应电动机以同步速度的一半运行，并且它是通过不平衡转子电路获得的。如果电动机在一个转子相断开或转子阻抗严重不平衡的情况下启动，它将加速到一半速度，并作为电动机或发电机稳定运行。几位研究人员已经进行了测试和分析，以找到以这种方式运行的电动机的特性。在本工作中的物理解释和等效电路。对一台5马力电动机的试验结果和计算结果进行了比较，两者吻合良好。不平衡的转子阻抗导致转差频率的不平衡转子电流和两个频率的平衡定子电流，基波和次谐波，其频率取决于速度。电机可以半速或全速稳定运行。半速时的扭矩大于全速时的扭矩，并且可能几乎与平衡转子的额定扭矩一样大。可能需要间歇地或作为临时措施以半速操作感应电动机。半速运行的缺点是低功率因数、低牵引转矩、次频率线电流和电机振动。
The Goerges phenomenon is the operation of a 3-phase wound-rotor induction motor at half of synchronous speed, and it is obtained by unbalancing the rotor circuit. If the motor is started with one rotor phase opened or with rotor impedances greatly unbalanced, it will accelerate to half speed and operate stably as a motor or generator. Several investigators have made tests and analyses to find the characteristics of a motor operated in this way. In the present work a physical explanation and an equivalent circuit are given. Results of tests and calculations for a 5-horsepower motor are compared and found to be in good agreement. The unbalanced rotor impedances cause unbalanced rotor currents of slip frequency, and balanced stator currents of two frequencies, the fundamental and a subharmonic, the frequency of which depends on the speed. The motor may be operated stably at half or full speed. The torque at half speed is greater than at full speed, and may be almost as great as the rated torque for a balanced rotor. It may be desirable to operate an induction motor at half speed intermittently or as a temporary measure. Disadvantages of half speed operation are the low power factor, low pull-out torque, the subfrequency line currents, and motor vibrations.