Considering the problem of response lag of jet pipe servo valve in the process of electric-magnetic-force-displacement conversion

a mathematical model of torque motor considering eddy current effect was established

and the dynamic characteristics of torque motor were obtained. Taking a certain type of jet tube flow servo valve as an example

a mathematical model of jet pipe servo valve considering the eddy current effect was established. The influence of main parameters on the frequency characteristics of the servo valve was obtained. Among them

the increase of air gap length

air gap magnetic permeability

and decrease of air gap effective area caused the servo valve to respond slowly

the number of control coil turns did not affect the frequency characteristics of the servo valve; decreasing the conductivity of the magnetically conductive material can increase the response speed of the servo valve. The servo valve was tested

the difference between the theoretical value and the test value was about 5%

verifying the correctness and effectiveness of this model.