Research On Winding Fault Diagnosis Method For Permanent Magnet Synchronous Motor

The paramountcy of permanent magnet synchronous motors(PMSM)is undeniable,for they possess a high power density,efficiency,and torque,thus making them widely utilized in aviation,transportation,defense,and the military.However,the main body faults of PMSMs are mainly winding open circuit and inter turn short circuit,which can lead to serious issues such as motor heating and damage.Therefore,to ensure the safe and reliable operation of the motor,timely and accurate detection of these faults is essential.This paper will explore the fault diagnosis methods of PMSMs,focusing on winding open circuit and inter turn short circuit faults.The following are the main contents.The basic PMSM theory is introduced.Firstly,the basic PMSM structure and working principle are introduced.Secondly,the mathematical model of PMSM is established under synchronous rotating coordinate axis.Subsequently,the magnetic field oriented control principle is introduced for PMSM drive control.Finally,a mathematical model for PMSM speed regulation system is established in MATLAB/Simulink environment.The data foundation is laid for designing subsequent fault diagnosis algorithms,where for PMSM winding open circuit faults and inter turn short circuit faults.Proposing a novel method of fault diagnosis for winding open circuits.This method based on an improved average current approach This was done to tackle the issues of low efficiency and inadequate adaptability of PMSMs’ traditional winding open circuit fault diagnosis algorithms.A mathematical model of a single-phase open circuit fault PMSM was constructed to start,and the current signal of the malfunctioning state was then determined.To counterbalance the effects of measurement noise,sliding window filtering was used to process the current signal.The improved average current method was then proposed to provide an adaptive threshold value,with the comparison result between the filtered current value and the threshold value serving as the basis for fault diagnosis.Finally,the proposed algorithm was validated by a simulation platform and the results demonstrated that it was both fast and stable compared to the traditional average current algorithm.A design was devised to tackle the problem of faulty diagnosis that occurred too soon,and it was based on a voltage DC component to diagnose inter-turn short circuit faults in PMSMs.To begin,a model of the inter turn short circuit fault in a PMSM was established.Subsequently,the voltage properties of a PMSM during inter-turn short circuit faults were examined and fault detection was conducted with these characteristics.The connection between three-phase voltage and current amplitudes during an inter-turn short circuit fault was examined,thereby establishing the fault location method.The simulation platform’s validation revealed that the algorithm could swiftly and precisely identify faults of different levels of inter-turn short circuit faults.At long last,a platform for verifying PMSM open circuit faults has been constructed.The design of the platform is finished in its entirety,including the hardware,software,and overall design.The PMSM’s current data,under both normal and fault conditions,is then transmitted to the higher computer.In the computer verify the PMSM winding open circuit fault diagnosis algorithm proposed in this thesis.The experimental results indicate that the method has practicality and validity.