| The effect of overheating fault of large electrical machine core is very serious, if can timely detect the fault, can reduce the loss of electrical machine fault. Therefore,need for large motor iron core fault detection for more in-depth research, to ensure the safety of electric power, stable power supply.First of all, academic dissertation detailed expounds the causes of the happen stator iron core fault and its development mechanism, studies for the electrical machine iron core fault the change of the iron core within electromagnetic field,analyses the testing principle and signal processing of the ELCID(Electromagnetic Core Imperfection Detection) method, for the follow-up, the realization of the electrical machine iron core fault experiment testing system laid a theoretical foundation.Second, this paper mainly introduced on large electrical machine iron core laminations short circuit experiment test system software and hardware implementation. Use Lw IP Ethernet communication protocol, the microprocessor LM3S8962 main control chip, designed a electrical machine iron core laminations short circuit experiment test system of in order to the ARM embedded system as the background. At the same time, according to the practical application requirements,for the conduct system hardware and software design, and through the hardware and software of design to develop the electrical machine iron core laminations short circuit experiment test system. Using the system for electrical machine stator core conduct experiment detecting, the experimental verification, the system can detect the electrical machine stator core to fault degree and fault position, and have the fast,convenient, accurate and reliable etc advantages.Finally, aim at the accuracy problem of the experiment detection system of design, academic dissertation adopted a kind of analysis between silicon steel blades of short circuit breakdown of the electromagnetic field in the area method. By usingthe vector magnetic potential and scalar potential A-φ, A finite element analysis method, respectively, on the same experimental conditions for the stator core ten slice and twenty slice fault in fault area conduct numerical simulation calculation, it is concluded that the magnetic flux density, current density and the eddy current loss for the distribution features. Observe the simulation result, and the electrical machine iron core laminations short-circuit fault degree as the magnetic flux density increases for Change rule. Compare the results of numerical simulation and experimental data,validation for academic dissertation design of electrical machine iron core experiment test system accuracy and stability, for the future of electrical machine iron core fault detection of development have provided the certain basis. |
