电动振动台气隙磁通和台面漏磁优化研究
Optimization Research of Air Gap Flux and Table Magnetic Flux Leakage in Electrodynamic Vibration Generator

电动振动台的气隙磁通和台面漏磁是两个重要的性能指标。要求台面漏磁尽可能小，气隙磁通尽可能大。目前增大气隙磁通的一般方法是增加励磁线圈的安匝数，但是这样会导致台面漏磁同步增大。可以通过在台面上添加消磁线圈的方式来减小台面的漏磁，但这种方法在设计、制造和使用中不太方便，甚至会在某些位置产生更大的杂散磁场。根据使用经验，适当减小上下励磁线圈的安匝数之比可以有效减小台面漏磁的大小。本文针对此现象，仿真研究了在相同励磁安匝数下，不同的上下励磁安匝比对气隙磁通和台面漏磁的影响。本文综合考虑气隙磁场和台面漏磁，确定了振动台设计时平衡气隙磁通与台面漏磁的一种新方法。
Air gap magnetic flux and magnetic flux leakage on the table are two important performance indicators of the electrodynamic vibration generator. It’s required that the magnetic flux leakage should be as small as possible and air gap magnetic flux should be as large as possible. At present, the general method of increasing the air gap magnetic flux is to increase the ampere-turns of the excitation coil, but the magnetic flux leakage will increase synchronously. The magnetic flux leakage can be reduced by adding a degaussing coil, but it is inconvenient in the design, manufacture and use, and even generates larger stray magnetic fields in some locations. According to the use experience, appropriately reducing the ampere-turns ratio of upper and lower excitation coil can effectively reduce the magnetic flux leakage. Aiming at this phenomenon, it’s simulated that the influence of different upper and lower excitation ampere-turns ratio on air gap flux and magnetic flux leakage when the when the number of ampere-turns remains unchanged. In this paper, considering the air gap magnetic field and the surface magnetic flux leakage, a new method of balancing the air gap flux and the surface leakage is established.？