Abstract
Servo valves are widely used for modern hydraulic actuator control. This valve consists of a torque motor with permanent magnets. In present study, a novel torque motor model is derived by considering magnetic flux leakage and demagnetization effect of the permanent magnets involved in the servo valve. The derived model was validated by comparing experimental data with the model calculation represented with physical parameters. Since these two important physical phenomena, missing in the previously well-known model, are considered in the newly derived torque motor model, it can be used for the physical parameter design of a torque motor and the analysis of a servo valve controlling electro-hydraulic servo systems.
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