Automobile Multipole Permanent Magnet Magnetic Induction Analysis

With the rapid development of automotive electronics technology, Hall sensors are widely used in the car, which raises higher demand for the matched multi-pole permanent magnet. It is both useful and theoretically important to research on the space magnetic flux density of the magnet for the matchup between the magnet and Hall sensors.This article is focused on the rectangular multiple permanent magnet, and the major contents and results are as follows:First, by deducing the space magnetic flux density equation for the rectangular permanent--magnetic monomer, we figured out the magnetic flux density expression applicable for every direction component. By using magnetic field superposition theory and space coordinate transformation, we deduced space magnetic flux density equation for random rectangular multipole permanent magnet of different material.Secondly, the car automatically shift solenoid trigger mechanism were studied. According to the matchup between Hall switch sensor and the density of permanent magnet field and by applying the theory of multistage permanent magnets, we studied magnetic induction intensity distribution in the plane of multipole permanent magnet in the automatic gearshift. By comparing the theoretical results with the experimental, the accuracy of the numerical integration of the permanent magnet field expression are verified. On the basis of the above research, the optimizing model is established, and the optimum permanent magnet thickness satisfying the working requirement of automatic shift gears is obtained.Finally, the electromagnetic trigger module of the electronic accelerator pedal is studied, and the theoretical analysis is verified by the experimental study based on the matching relationship between the linear Hall sensor and the permanent magnet. In order to enhance the anti-interference performance of the existing electromagnetic triggering module, the magnetic circuit of the accelerator pedal is optimized. The results of optimizing shows that the new closed circuit is helpful to improve the interference resistance and stability of the accelerator pedal.