基于等效磁路法的电磁力发生器单磁路优化设计

Single magnetic circuit optimization design of an electromagnetic force generator based on an equivalent magnetic circuit method

单磁路电磁力发生器在音圈执行器和振动计量等领域具有广泛的应用,其关键是通过合理的结构设计在磁路气隙中产生具有高分布均匀性的强磁场。提出一种基于等效磁路法的电磁力发生器单磁路解析模型及结构优化设计方法,以典型单磁路为研究对象,基于等效磁路原理和集总参数法建立了气隙磁感应强度分布关于结构尺寸的解析理论模型,并采用有限元仿真验证了理论模型的正确性,二者相对误差约为2.5%,且理论计算较有限元仿真可提高约2000倍的计算效率。分析了各结构尺寸对气隙平均磁感应强度及其分布不均匀性的影响,并通过优化设计获得了较优的结构参数。优化分析结果表明,采用该方法可将气隙平均磁感应强度提升约150%,磁感应强度分布不均匀性减小约29%。

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.An analytical modeling and structural design optimization method was proposed for the single magnetic circuit of electromagnetic force generators based on an equivalent magnetic circuit.The analytical theoretical model of the air gap magnetic induction intensity distribution with respect to the structure size was established based on the principle of the 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 was 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.