Servo motor direct-drive type servo valve

Abstract

The invention provides a servo motor direct-drive type servo valve which has fewer stages, high system stability, good reliability, strong anti-fouling performance, low maintenance cost, a wider application occasion, and lower manufacturing difficulty and cost. The servo motor direct-drive type servo valve comprises a main valve element, a valve body, a spring, a valve body end cover, a lead screw nut, a ball screw and a servo motor, wherein the main valve element is mounted in the valve body in a sliding mode; four oil ports are arranged in the valve body; on-state among the four oil ports is regulated by virtue of changes of left, middle and right positions of the main valve element; the left end of the main valve element is resisted against the valve body end cover through the spring; the right end of the main valve element is connected with the lead screw nut; the lead screw nut is mounted on the ball screw; the servo motor comprises a servo motor shaft, a servo motor rotor, a servo motor stator and a rotary coder; the left end of the servo motor shaft is connected with the balls crew; the servo motor rotor is connected with the servo motor shaft; the servo motor stator is arranged outside the servo motor rotor in a sleeving mode; and the rotary coder is mounted at the right end of the servo motor shaft.

Description

technical field [0001] The invention relates to a servo valve, in particular to a servo motor direct drive type servo valve. Background technique [0002] Servo valve, also called hydraulic control servo valve, mainly refers to the electro-hydraulic servo valve, which outputs the modulated flow and pressure after receiving the electrical analog signal. It is not only an electro-hydraulic conversion element, but also a power amplification element, which can convert weak electrical input signals with low power into high-power hydraulic energy (flow and pressure) output. In the electro-hydraulic servo system, it connects the electrical part with the hydraulic part to realize the conversion and hydraulic amplification of the electro-hydraulic signal. The electro-hydraulic servo valve is the core of electro-hydraulic servo system control. [0003] Electro-hydraulic servo valves are generally divided into two types according to the torque motor type: moving coil type and permane...

AI Technical Summary

Problems solved by technology

This leads to unsatisfactory linearity in practical applications, and the zero position is easy to drift

Especially affected by ambient temperature and vibration, which affects reliability

[0006] 2. The dual nozzles and baffles in the existing structure are more difficult and costly in actual processing

If the oil is not clean and may be polluted, it will cause partial or complete blockage of the nozzle or orifice, resulting in a decrease in frequency response, low resolution, and serious system instability and servo valve failure.

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