Smith单相电容电动机电容器故障运行的建模

Modeling of Smith Single-Phase Capacitance Motors with Capacitors Fault

建立了Smith单相电动机电容器故障运行时在α-β-0坐标系下的瞬态数学模型.此模型适用于任何接线方式的对称三绕组单相电容电动机电容器故障的瞬态分析,尤其便于计算机编程.通过实例进行仿真和试验,验证了该模型的正确性.研究表明,Smith单相电容电动机运行中电容器短路是一种较为严重的故障,有可能产生很大的冲击转矩,造成强烈的机械振动;电容器开路故障有可能使定子三相电流严重不平衡,致使某相绕组烧毁.

This paper deals with the capacitor fault operation transient process analysis of Smith single-phase capacitance motors. To get the characteristic of transient state, we have built a mathematical model of Smith single - phase capacitance motor in the α -β-0 reference frame under the capacitors fault operation. This mathematical model is particularly easy to computer programs, and it can be applied to the transient analysis of symmetric three windings single-phase capacitance motors with any connect line method under the capacitor fault. The model is validated by comparing a sample simulated result with the dynamic performance measured in the laboratory. This research has indicated that the capacitor short-circuit of Smith single-phase capacitance motors in operation is a more serious breakdown, which may have very big impact torque and create intense mechanical vibrations. The capacitor open-circuit breakdown may cause the stator three-phase current to be seriously imbalanced and cause some phase winding to burn down.