Study On Electromagnetic Noise Generation Mechanism And Simulation Of Oil Pump Unit Based On ANSYS

Oil is indispensable to human production and life.In the process of oil transmission,the role of oil pump unit is particularly important.The oil transmission pump unit is mainly composed of centrifugal pump and motor,which will inevitably have various faults under the condition of long time operation.The stop-production maintenance will not only affect the production but also waste time,so the real-time monitoring method based on noise becomes the best choice.The change of noise reflects the different working state of the motor.It is a new research hotspot to use noise to detect the safety state of the motor.In order to detect the working state of the motor with noise,the mechanism and noise characteristics of typical motor faults should be simulated.This paper takes YBM355m2-2 type three-phase asynchronous motor in actual oilfield production equipment as an example,and USES finite element software to simulate bar breaking fault for simulation analysis.Based on the mechanism of electromagnetic noise of motor,the variation mechanism of electromagnetic noise caused by motor slip-breaking fault is studied.Article USES analytic method two broken state the influence of the location of the fault degree,respectively,for two consecutive broken bars fault,interval of 10 conducting bar two broken bar fault and interval 20 conducting bar two broken bar fault simulation and get a different position two broken bar fault at a certain moment in the lines of magnetic force distribution,magnetic cloud density distribution,the radial air-gap magnetic density and the change of radial force.The effect of the broken bar fault on the vibration and noise of the motor is analyzed in the early stage.On this basis,the influence of different degree of bar fault on the air gap magnetic field is analyzed by finite element method.The distribution of magnetic field lines,magnetic cloud density,air gap magnetic field and radial force are obtained after the fault.According to the comprehensive analysis of the influence factors,the fault determination method is determined.The inherent mode of motor is an important factor of electromagnetic noise of motor.In this paper,the inherent mode of motor stator is deduced by analytical method and simulated by finite element software.ANSYS harmonic response module is used to calculate the harmonic response velocity and displacement.The simulation results are used to calculate the sound pressure level of electromagnetic noise.In this paper,the influence of the natural frequency of the mechanical structure of the motor and the spatial distribution of radial electromagnetic force density on the vibration and noise of the motor is studied.The simulation results provide a theoretical basis for on-line detection of motor slip-breaking faults.