4. 通过有限元仿真及实验研究，得出涡流效应对力矩马达的主要影响方式可

4. Through finite element simulation and experimental research, it is concluded that the main influence of the eddy current effect on the torque motor can be regarded as increasing the damping coefficient of the torque motor, and at the same time, the step response time of the system is delayed by about 1ms; the maximum working of the torque motor is The bandwidth is only about 50Hz, which is much smaller than the working bandwidth of the servo valve. It can be seen that the low working bandwidth of the torque motor limits the working performance of the servo valve. In order to improve the working bandwidth of the flow regulator, the simplest way is to increase the mechanical spring stiffness coefficient as much as possible under the maximum allowable excitation current. The system can easily become an overdamped system.

4. Through finite element simulation and experimental research, it is concluded that the main influence mode of eddy current effect on torque motor can be seen as increasing the damping coefficient of torque motor and delaying the step response time of the system by about 1ms; The maximum working bandwidth of torque motor is only about 50Hz, which is far less than that of servo valve. It can be seen that the low working bandwidth of torque motor limits the working performance of servo valve. In order to improve the working bandwidth of the flow regulator, the simplest way is to increase the mechanical spring stiffness coefficient as much as possible on the premise of the maximum allowable excitation current. At the same time, it must be ensured that the mechanical spring stiffness coefficient is more than twice that of the magnetic spring, otherwise the system is easy to become an over damped system.

4. Through finite element simulation and experimental research, it is concluded that the main influence way of eddy current effect on torque motor can be regarded as increasing the damping coefficient of torque motor, and at the same time making the step response time of the system lag about 1ms; The maximum working bandwidth of torque motor is only about 50Hz, far less than that of servo valve. It can be seen that the low working bandwidth of torque motor limits the working performance of servo valve. In order to improve the working bandwidth of the flow regulator, the simplest way is to increase the stiffness coefficient of the mechanical spring as much as possible under the premise of maximum excitation current, and at the same time, the stiffness coefficient of the mechanical spring must be more than twice that of the magnetic spring, otherwise the system will easily become an overdamped system.