By using the larger magnetic permeability , magnetic fluid was used to improve the magnetic circuit efficiency in torque motor , enlarge the output torque and displacement of torque motor , and the output flow of servo valve . correspondingly , the ability of noise - overcoming and system damping was enhanced due to the property of magnetic fluid . as a result , the stability of servo valve and servo - control system can be improved 由于磁流体具有较大的导磁率,可提高力矩马达磁路效率、增大力矩马达的输出力矩和位移,从而增加伺服阀的输出流量;同时,利用磁流体的粘度特性,可增强力矩马达阻尼及抗干扰能力,从而增强伺服阀及伺服控制系统的稳定性。
The higher temperature , the more fe ( co ) 5 decomposed in the gaseous phase . when the temperature was raised to 150 , the thermolysis entirely happened in gaseous phase and the particles of 2 - 4um formed in long chains . with long chains broken , the plural relative permittivity ( e " , e " ) drop and plural magnetic permeability ( u " , u " ) rise 恒温滴加法受温度影响显著，随着温度的升高，发生在气相中的热分解量增加； 150下fe ( co ) _ 5完全在气相中分解，产物为2 4 m的微粒形成的链状结构，这种链状结构的破坏有利于复介电常数( 、 )的降低、复磁导率( 、 )的提高。
In the anistropic magnetic medium under the condition of magnetic permeability 11unequal to 33 , the magnetic field on axis line of current - carrying coil and that inside current - carrying solenoid can be calculated by applying biot - savart law of that medium . as the condition of their service is restricted , it is necessary to derive the magnetic field on axial line of current - carrying coil and that inside current - carrying solenod under more general condition of 11unequal to 33 . on the basis of the magnetic field on axial line of current - carrying coil in anisotropic magnetic medium under the derived condition of 11unequal to 33 , the authors obtain the magnetic field on axial line of current - carrying solenoid in anisotropic magnetic medium under general condition of 11unequal to 33 . the result shows a wider applicable coverage 利用毕奥-萨伐尔定律，并在磁导率11 = 33的条件下，可求出各向异性磁介质中载流圆线圈轴线上的磁场，以及载流直螺线管内部的磁场.显然，其使用条件受到限制.为此，有必要导出在11 33的更一般情况下，各向异性磁介质中载流圆线圈轴线上磁场和载流直螺线管内部的磁场.在已导出11 33及各向异性磁介质中载流圆线圈轴线上磁场的基础上，求出一般情况下各向异性磁介质中载流圆线圈轴线上的磁场，使其结果适用范围更广
