十五相感应电机对称缺相运行时的定子漏抗计算

定子参数计算是应用等值电路进行多相感应电机对称缺相运行性能分析的基础。通过引入关联矩阵反映所缺相数,分别对定子槽漏抗、谐波漏抗、端部漏抗进行计算,得到了十五相感应电机缺一个五相、两个五相绕组对称工况下的定子漏抗。计算结果表明,对于整距集中绕组的十五相感应电机,缺少五相或十相后,每相槽漏抗不变,谐波漏抗增大,而端部漏抗减小,故对称缺相运行工况下的定子漏抗参数与正常工况下并无明确倍数关系。在正常工况及缺十相对称运行工况下对十五相感应电机原理样机进行了堵转试验,试验测得的短路电抗与计算值相互吻合,间接验证了计算结果的正确性。

Calculation of Stator Leakage Reactance of Fifteen-Phase Induction Motor Under Symmetrical Fault Condition

To analyze the operation performance of multiphase induction motors under symmetrical fault condition,the stator leakage reactance in the equivalent circuit should be predicted. The stator slot leakage reactance,harmonic leakage reactance and,end-winding leakage reactance of the fifteen-phase induction motor are analyzed using an incidence matrix model to reflect the five-phase and ten-phase open-circuited fault operation. The analysis results indicate that the stator slot leakage reactance is unchanged and the harmonic leakage reactance is increased,while the end-winding leakage reactance is reduced for fifteen-phase induction motor with full-pitch concentrated stator winding under five-phase and ten-phase open-circuited conditions. Thus, there is no exact integer relationship of the stator leakage reactance between symmetrical fault and normal condition. The short-circuit reactances of a prototype fifteen-phase induction motor are measured with locked-rotor test under normal and ten phases opened-circuited conditions. The analytically predicted results are compared with the measured results,where good agreements are achieved.