T161-902A-00-B4-2-2A MOOG Servo valve controller

Description

Technical Description T161-902A-00-B4-2-2A:

A typical servo valve consists of a permanent magnet torque motor, a nozzle, a stop plate, a spool, a sleeve, and a control chamber (see figure). When the input coil enters the current, the baffle moves to the right, so that the throttling effect of the right nozzle is strengthened, the flow rate is reduced, and the right side back pressure is increased; At the same time, the throttling effect of the left nozzle is reduced, the flow rate is increased, and the left back pressure is decreased. The forces at both ends of the spool are out of balance, and the spool moves to the left. High pressure oil flows from S to C2 to the load. The load return oil flows through the return port of C1 and enters the tank. The displacement of the spool is proportional to the input current of the torque motor, and the liquid pressure acting on the spool is balanced with the spring force, so the differential current of the torque motor is proportional to the displacement of the spool in the equilibrium state. If the input current is reversed, the flow is also reversed. The table shows the classification of servo valves.
Servo valves are mainly used in electrical hydraulic servo systems as actuator (see hydraulic servo system). In the servo system, compared with the electric and pneumatic actuator, the hydraulic actuator has the characteristics of good speed, large output power per unit weight, smooth transmission, strong anti-interference ability and so on. On the other hand, electrical components are used to transmit signals and correct characteristics in the servo system. Therefore, the modern high performance servo system also adopts the electro-hydraulic mode, the servo valve is the necessary component of this system.
HQJDDV direct drive electro-hydraulic servo valve

Servo valve structure is complex, high cost, high demand for oil quality and cleanliness. New servo valves are trying to overcome these shortcomings, such as the use of electro-strictive components of the servo valve, greatly simplifying the structure. Another direction is the development of special working oil (such as electric viscous oil). This working oil can change the viscosity coefficient under electromagnetic action. This property can be used to directly control the oil flow through electrical signals.

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T161-902A-00-B4-2-2A

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