基于多电磁线圈天线的电气部件状态监测研究

Study on Condition Monitoring of Electrical Components Based on Multi Electromagnetic Coil Antenna

利用低频电磁辐射场对电气元件进行状态监测和故障诊断。其主要目的是建立接收线圈阵列,对电气部件周围的辐射电磁场进行检测和监测,并将其应用于各种电力元件的状态监测和故障诊断。提出了一种柔性三维印刷线圈天线,用于电机故障检测。首先,以捕获组件中最敏感的杂散场为目标,找到线圈天线的最佳位置。再利用有限元方法,首先对正常状态下机器周围的磁场进行天线最敏感位置的识别。然后,在元件内部的线圈和绕组发生短路时,观察电机的磁场。磁场谐波阶数幅值的变化有助于识别短路故障。最后,根据正常磁场和故障磁场振幅的变化对结果进行比较,并发送到信号处理单元进行诊断。

The low frequency electromagnetic radiation field is used for condition monitoring and fault diagnosis of electrical components.The main purpose is to establish the receiving coil array to detect and monitor the radiated electromagnetic field around the electrical components,and apply it to the condition monitoring and fault diagnosis of various power components.A flexible three-dimensional prin-ted coil antenna is proposed for motor fault detection.Firstly,the most sensitive stray field in the acquisition module is the target to find the best position of the coil antenna.Secondly,the most sensitive position of the antenna is identified by using the finite element method.Then,the magnetic field of the motor is observed when the coil and winding inside the component are short circuited.The change of har-monic order amplitude of magnetic field is helpful to identify short circuit fault.Finally,the results are compared according to the change of normal magnetic field and fault magnetic field amplitude,and sent to the signal processing unit for diagnosis.