Abstract
For the purpose of motor fault real-time monitoring, this research developed a nano-silicon ni- tride film based magnetic field (MF) sensor, and applied this sensor in MF detection of two common faults. Through experiment, it turned out that arc discharge and slot discharge occur in motor fault produce MF with certain laws. This result proved the feasibility of the sensor and sensing method in MF analysis, and revealed possibility of a new method in fault detection.
Highlights
The motor, in an event of a failure, may produce a spark discharge
Arc discharge magnetic field (MF) lasts longer with much noise. It is shown in amplitude-frequency wave that the signal is mainly distributed in the range of 0 - 750 kHz, so arc discharge signal has a wider band compared with slot discharge signal
A MF sensor has been developed for motor fault discharge detection
Summary
The motor, in an event of a failure, may produce a spark discharge. This spark can be a direct source of fire, and it can damage power instruments because of the heat generated in discharge. The electric field and magnetic field strengths will have some certain levels of changes. By sensing and analyzing the feature of changing intensity, we can monitor and diagnose the faults in an operating motor. We need magnetic field sensing elements, which can accurately obtain the MF intensity on a specific point. We describe the procedure of sensor development, and use the sensor manufactured in magnetic field analyzing
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