Magnetic analysis and COMSOL simulation of cylindrical NdFeB permanent magnet

The most powerful permanent magnet in contemporary magnets is the third-generation rare earth, which is a tetragonal crystal formed mainly from neodymium, iron, and boron. Permanent magnet NdFeB material has excellent magnetic properties and is a very widely used material, which is widely used in various fields such as sensors, motors, generators, medical equipment, magnetic machinery and acoustic transducers. Among them, square NdFeB permanent magnets are mostly used to make sensors or speakers and headphone drivers. In order to better apply square NdFeB permanent magnets, it is very important to analyze their magnetic field forces. In this paper, the theoretical formula is first introduced, and then the FEMM finite element simulation analysis is carried out on the square NdFeB permanent magnet, and the magnetic field strength and magnetic adsorption force of the square NdFeB permanent magnet are studied by combining simulation and actual measurement methods. Finally, the magnetic induction intensity and magnetic adsorption force of the square NdFeB permanent magnet are measured by Tesla meter and force sensor, the reliability and feasibility of the formula derivation and simulation results are verified, the errors of the actual measurement and theoretical analysis are analyzed, and the law of the change of the edge length of the square NdFeB permanent magnet and the magnetic induction intensity on its surface and the magnitude of the magnetic force of the magnet are inferred.