![]() ![]() This paper proposes seven rules for analysis of motion in an electric field, analyzes the uniform motion and variable motion in an electric field on the basis of such rules, clarifies the inherent causes of Lorentz force, theoretically qualitatively and quantitatively demonstrates why there exists the electrostatic field at some locations around the permanent magnet, and considers that all the magnetic phenomena are resulted from the contraction of electric field in the direction of motion, which is derived from the natural law of constant velocity of light, and therefore all the electromagnetic phenomena is rooted in the constant velocity of light. It can be seen from analysis of all electromagnetic phenomena that, all the electromagnetic phenomena will be inevitably accompanied by an electron motion and the electron motion is bound to take effect through an electric field therefore, the analysis of motion in an electric field is the basis for analysis of all electromagnetic phenomena. ![]() the same direction of action and reaction, infinitely high kinematic velocity of magnetic field, etc. Moreover, it may also lead us to make incorrect inferences in the theoretical analysis of electromagnetics, e.g. explanation of any inherent causes and physical processes of electromagnetic induction, displacement current, Lorentz force and other surface phenomena. It is noted that, the basic defect of electromagnetics is that there is no. This paper makes an analysis of the defects of electromagnetics from fourteen aspects. P class="1Body">Experiments show that, there is the electrostatic field around the permanent magnet since the electromagnetics can not explain this phenomenon, it can be concluded that there are some defects in electromagnetics. The results play a significant guiding role in both electric vehicle and permanent magnet synchronous motor for noise control and analysis. According to contribution analysis, motor surface zones and transfer paths contributing largely to the interior motor electromagnetic noise are identified. Finally, by combining with transfer path analysis (TPA) techniques, interior electromagnetic noise of electric vehicles is accurately predicted. Compared with experimental test results, the creditability of motor electromagnetic vibration simulation is proved. ![]() Thirdly, radiated electromagnetic vibration acceleration on the surface of the motor is calculated with modal superposition method. This excitation is then projected onto the structure mesh of motor in order to calculate the dynamic response. Secondly, using an electromagnetic finite element solver, the excitation due to electromagnetic phenomena is obtained. Based on FEM, natural frequency and modal shape were calculated by modal analysis. Firstly, the principle of the multiphysics method is to establish a complete 3Dstructural finite element model (FEM) of motor. noise caused by electromagnetic forces in permanent magnet synchronous motor (PMSM) for electric vehicles. This paper describes a numerical model to predict interior acoustic. However, the interior noise of an EV usually contains significant high-frequency noise components caused by electrical motor, which can be subjectively perceived as annoying and unpleasant. ![]() Electric vehicles (EV) are considerably quieter than internal combustion engine (ICE) powered vehicles, because noise of ICE is eliminated. ![]()
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