PMSM (permanent magnet synchronous motor) degradation experiment device in underground environment and motor service life prediction method

Abstract

The invention belongs to the technical field of oil field drilling, and discloses a PMSM degradation experiment device in an underground environment and a motor service life prediction method. The method for predicting the residual life of the motor in the underground environment comprises the following steps of: acquiring a measurement signal of a permanent magnet synchronous motor by using a sensor, performing spectral entropy analysis on a stator three-phase current signal of the permanent magnet synchronous motor, and extracting a spectrum complexity change condition of the stator three-phase current signal in a degradation process; wavelet time-frequency band energy conversion is carried out on the vibration signals, and energy changes of the vibration signals in the degradation process are extracted; the collected temperature, sound wave, torque and rotating speed, the extracted stator three-phase current signal and the extracted vibration signal are divided into a training set, a test set and a verification set, and the data sets are transmitted to a network to train the network. According to the method, the real-time residual service life prediction of the permanent magnet synchronous motor of the underground drilling communication tool can be realized, and the operation reliability and the working safety of an underground system are improved.

Description

technical field [0001] The invention belongs to the technical field of oilfield drilling, and in particular relates to a PMSM degradation experiment device in a downhole environment and a method for predicting the remaining life of a motor in the downhole environment. Background technique [0002] Domestic rotary steerable drilling tools and downhole mud pulse communication tools, as the core of high-end automatic drilling equipment, are facing the technical problem of insufficient reliability. Whether their only actuator-Permanent Magnet Synchronous Motor-PMSM can operate normally affects its reliability. important factor in sexuality. [0003] Especially in the field of oil drilling, when drilling tools work in harsh environments with high temperature, high pressure, strong vibration and large impact for a long time, the life of the permanent magnet synchronous motor will be significantly reduced. If the PMSM cannot be lifted and repaired before it breaks down , ranging f...

AI Technical Summary

Problems solved by technology

This application discloses a method for simulating the degradation process of permanent magnet synchronous motor stator turn-to-turn short-circuit fault based on the interaction model. The internal complexity of PMSM will lead to model failure; 2. In the permanent magnet synchronous motor degradation simulation system, the influence of the product use environment is not considered

This application discloses a method for detecting the degree of degradation based on PMSM vibration and stator current data. Its disadvantages are: it does not take into account the processing of noise in the collected data; the data of normal motors and faulty motors The duration and interval of collection are different, resulting in the diversification of experimental variables and reducing the credibility; and the influence of the product use environment is not considered

The application announced a solution to the existing RUL prediction method of the electric turntable. There is also a trend of health factor mutations when the RUL prediction is made before the turning point of the electric turntable, and the new data cannot be updated when the RUL prediction is made after the turning point, resulting in low prediction accuracy. Methods

The shortcomings of this method are: based on the model to predict the future state of PMSM, the variability of the model after failure is not considered; the rotating platform is based on PMSM, and the impact of the product use environment on the permanent magnet synchronous motor is not considered

The disadvantage of this method is that only the vibration signal is used, and the collected torque and speed signals are not processed, and only the frequency domain signal is processed, and the vibration signal in the time frequency domain is not processed, resulting in a waste of data; The experimental device does not consider the influence of the use environment on the motor, which will lead to the prediction method may not be effective in the real use environment

[0012] (1) The prior art permanent magnet synchronous motor degradation experimental equipment cannot obtain signals with the same characteristics as the actual downhole information, and cannot provide a basic sample set for training the deep learning network for prediction of remaining service life, so that the drilling system can perform relevant downhole real-time predictions Unable to accurately predict the remaining service life of PMSM

[0013] (2) The existing technology cannot reduce the measurement interference caused by downhole low-frequency vibration for the actual operating environment of the pmsm based on the downhole, and extract useful fault information for training, so that the information of the uphole experimental system and the downhole actual system do not match, and The degradation information of PMSM cannot be fully extracted, which makes the accuracy and reliability of PMSM life prediction poor

[0014] (3) The existing technology cannot adaptively weaken the impact of low-frequency strong vibration on the prediction data, which reduces the prediction accuracy of relevant data related to PMSM degradation

[0015] (4) In the prior art downhole real-time prediction system, due to the problem of small downhole storage and computing power, it is impossible to perform real-time remaining service life prediction and information transmission on the downhole PMSM

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