基于等效磁路法的电磁力发生器单磁路优化设计

The electromagnetic force generators with a single magnetic circuit are in high demand in fields such as voice coil actuators and vibration metrology, where the key is to generate a strong magnetic field with high distribution uniformity in the magnetic circuit air gap through a rational structural design. This paper proposes an analytical modeling and structural design optimization method for the single magnetic circuit of electromagnetic force generator based on the equivalent magnetic circuit. The analytical theoretical model of the air gap magnetic induction intensity distribution with respect to the structure size is established based on the principle of equivalent magnetic circuit and the method of collective parameters, taking a typical single magnetic circuit as the research object. The accuracy of the theoretical model is verified by using finite element simulation, the relative error is about 2.5%, and the theoretical calculation can improve the calculation efficiency by about 2000 times. The influence of structure size on the average magnetic induction intensity of air gap and its distribution unevenness was analyzed, and better structure parameters were obtained by optimizing the design. The optimized analysis results show that the average magnetic induction intensity of the air gap can be increased by about 150%, and the distribution unevenness of magnetic induction intensity can be reduced by about 29% by using the proposed method.