本发明涉及一种基于电流信号的风力发电机变桨传动皮带故障诊断方法，包括以下步骤：获取变桨皮带传动系统主动轴电机定子电流信号；对上述电机定子电流信号进行预处理，使其满足监测系统要求：利用数据分析方法得到预处理后的所述电机定子电流信号的频谱图；如果所述频谱中基频设定范围内出现故障边频峰，则认定为变桨皮带传动系统的皮带出现故障。使用本发明的方法可以在不增加传感器的情况下识别由皮带老化引起的打滑故障。

The present invention relates to a method of wind turbine pitch drive belt fault diagnosis based on current signal, comprising the following steps: obtaining the stator current signal of the active shaft motor of the pitch belt drive system; pre-processing said motor stator current signal so that it meets the requirements of the monitoring system: obtaining a spectrum diagram of said motor stator current signal after pre-processing using a data analysis method; if a fault side frequency peak appears in said spectrum in the base frequency setting If a fault side frequency peak appears in the set range of said spectrum, it is determined that the belt of the pitch belt drive system is faulty. Using the method of the invention it is possible to identify slipping faults caused by belt aging without additional sensors.