基于改进瞬时功率法的电动机故障诊断

从采集的鼠笼异步电动机定子电流出发,建立了流方的概念,通过故障电流的自乘方放大并转移故障特征频率。根据瞬时功率的概念提出了基于改进瞬时功率法的电动机故障诊断方法,通过理论推导分别提取了转子断条故障和转子偏心故障在流方中的特征频率分量,有效地克服了转子断条故障特征频率容易被基频淹没的缺点,实现了对转子断条、偏心、复合等故障的辨别诊断。该方法与传统瞬时功率法相比,采集的数据量减半,避免了电压波动和采样误差对瞬时功率的影响。

Fault diagnosis of motor based on improved instantaneous power method

The concept of voltaic involution was established starting from collected stator current of squirrel cage induction motor,and the voltaic involution was used to enlarge and transfer fault characteristic frequency.The fault diagnosis method of motor based on improved instantaneous power method was proposed according to concept of instantaneous power. The characteristic frequency components of rotor bar breaking fault and rotor eccentricity fault were extracted by theoretical analysis,which can effectively overcome the shortcomings that characteristic frequency of rotor bar breaking fault is likely to be flooded by fundamental frequency,and realize distinguishing and diagnosis of rotor bar breaking fault,eccentricity fault and complex fault.The data need to collect was cut by half and influence of voltage fluctuation and sampling error to instantaneous power was avoided compared with the traditional instantaneous power diagnosis method.