Lithium iron phosphate rotary kiln operation state fault diagnosis method

Abstract

The invention relates to the technical field of fault diagnosis, and discloses a lithium iron phosphate rotary kiln operation state fault diagnosis method, which comprises the steps of synchronously acquiring a three-phase stator current signal and a motor instantaneous rotating speed signal of a rotary kiln driving motor, performing trend term removal processing on the acquired signals, and intercepting analysis data; calculating a theoretical fault frequency, decomposing a three-phase stator current signal in the analysis data, and screening out a bending characteristic modal signal; bending characteristic energy density is calculated, and a cylinder thermal creep bending index capable of eliminating rotation speed adjustment interference is constructed; and inputting the thermal creep bending index of the cylinder into a central control system, comparing the thermal creep bending index with a preset first threshold value and a preset second threshold value, and controlling the rotary kiln to execute normal operation according to a comparison result, starting a thermal straightening program or triggering safe shutdown operation. According to the invention, a sensor susceptible to environmental interference is abandoned, the motor is used for driving the cable to carry out signal acquisition, and online real-time monitoring and distinguishing of normal speed regulation and fault fluctuation can be realized.

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