Remanufacturing Oriented Evaluation Method And Inspecting Device Research For Stator Winding Of ELV Motor

With the rapid development of economy and society,resources and environment are consuming constantly.A large number of products facing scrapped when they failure.If the scrapped products are discarded directly or backfilled as the common garbage,it is not only a great waste of resources,but also has a significant impact on the environment.Auto,as a staple consumption,its possession quantities are increasing fleetly,and a great number of autos will enter into the scrapping area every year at the same time.The scrapping of the overall doesn't mean all the parts in an auto have scrapped sometimes.Electrical machine is an important and numerous unit in an auto,if it can be reused properly,a mess of resources will be saved.Remanufacturing,which is a hot area of the current research,aims to deal with the wasting and makes them possess the usability again.It is an important means of promoting sustainable development.Detection of the wasting products is a key step of remanufacturing.A reliable detection of the stator winding,which is a vital component of a motor,is an important guarantee for the remanufacturing motors' performance.In this paper,the evaluation methods and design of a reconfigurable inspecting device for stator winding fault detection were studied.The common fault types and their causes of stator winding were summarized,and the inter-turn short-circuit fault was chosen as the main research fault in this paper.The mathematical formulations of stator winding induction voltage were deduced.The phase coordinate and dq coordinate mathematical models of inter-turn short-circuit fault were established.The characteristics and shortcomings of the existing stator winding detection devices were analyzed,and the overall design scheme of the reconfigurable on-line inspecting device for stator winding detection was presented.Its basic functions were also described.Combined with ovonic ball screw mechanism,a stator tightening device was designed.According to the conventional motor rotor structures,the mimetic rotor structure of the inspecting device was projected.The hardware and software designs of the signal acquisition system were narrated.A set of signal acquisition system equipments was build.The whole three-dimensional model of the inspecting device was founded.Taking the small permanent magnet generator as the experimental object,the inter-turn short-circuit fault of the stator winding was simulated by man-made,and the fault current was collected.The Fourier transform,wavelet analysis and wavelet packet decomposition were used respectively to comtrast the stator fault evaluation methods.The sub-band energy values of the wavelet packet decomposition were chosen as the fault feature quantity,and the intelligent diagnosis of the fault was studied by applying PNN network.Based on the collected large amount of experimental data,the test results are pretty good.Using the ANSYS finite element analysis software,the spacial magnetic field of the mimetic rotor was analyzed from the view of magnetic field distribution and magnetic circuit,and the distribution and values of magnetic induction intensity were chosen as the judgment criterion.The design of the mimetic rotor was improved by magnetic field analyses from three facets,which were the determination of excitation scheme,the layout optimization of yoke and the optimization of plates' materials.The magnetic field analyses of the three rotors with different outer diameters were carried out,and the magnetic properties of the designed yoke are verified,the configurability of the designed mimetic rotor is also proved.