Direct drive differential volume control electro-hydraulic servo control system

Abstract

The invention relates to a direct driving type differential volume control electro-hydraulic servo control system, and relates to the field of electro-hydraulic servo. The direct driving type differential volume control electro-hydraulic servo control system consists of an alternating current servo motor, a two-way constant delivery pump, a P type two-position four-way reversing valve, a pressure oil tank, a single-discharge-rod hydraulic cylinder and the like. The alternating current servo motor drives the two-way constant delivery pump for providing motive power, and realizes the starting, the reversing, the stopping and the speed variation of the hydraulic cylinder according to the control instructions. The direct driving type differential volume control electro-hydraulic servo control system has the advantages that the two-way constant delivery pump is driven through the alternating current servo motor, the P type two-position four-way reversing valve is driven, and the reversing function and the differential function of the single-discharge-rod hydraulic cylinder are realized, so the reciprocating movement characteristics of the hydraulic cylinder are consistent, the control difficulty of the direct driving type volume control electro-hydraulic servo control system is reduced, and in addition, the control precision and the reliability of the system are improved.

Description

Technical field [0001] The invention belongs to the technical field of electro-hydraulic servos, and particularly relates to a direct-drive type differential volume control electro-hydraulic servo control system. Background technique [0002] Electro-hydraulic servo system is widely used in aerospace, national defense and civil fields because of its large output, high precision and fast response. However, the traditional electro-hydraulic servo system itself has inherent shortcomings. For example, the electro-hydraulic servo valve has high requirements for oil cleanliness and weak anti-pollution ability; the hydraulic servo system controlled by the electro-hydraulic servo valve has extremely low working efficiency, etc. The electro-hydraulic servo system is more widely used. With the development of AC servo technology, a new type of electro-hydraulic servo system-direct-drive volume control electro-hydraulic servo system has the dual characteristics of the flexibility of AC serv...

AI Technical Summary

Problems solved by technology

However, the dynamic characteristics of this system are not high, the response speed is not fast, and the response frequency is not high, which also limits its application within a certain range.

[0004] Because the asymmetric cylinder has the advantages of simple structure, less space, and large load-carrying capacity, it is necessary to use an asymmetric cylinder in some occasions. Similarly, it shows obvious asymmetry of forward and reverse motion, which makes the control difficult and affects the control effect

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