Numerical control hydraulic system of switch reluctance motor pump

Abstract

A numerical control hydraulic system of a switched reluctance motor pump belongs to the filed of the hydraulic transmission and the hydraulic machinery. The invention is characterized in that the invention comprises a hydraulic system and a reversible stepless speed regulating system which are connected with each other. Compared with the prior art, the invention realizes speed regulating, direction changing, numerical control of pressure and displacement, which can simplify the structure of the hydraulic system greatly and eliminate the throttling loss in the system. Meanwhile, the invention has the advantages of simple structure, credible work, strong mechanical strength, high efficiency, energy saving, high speed regulating precision, small start electrical current and frequent positive inversion operation, which can realize the high efficient operation in the broad speed regulating range. The invention is applicable to transport machine, forging machine, metallurgy machine, molding machine, oil press, injection molding machine, die casting machine, rolling mill, pressurizer, etc.

Description

technical field [0001] The invention relates to a numerically controlled hydraulic system of a switched reluctance motor pump, which belongs to the field of hydraulic transmission and hydraulic machinery. Background technique [0002] At present, most hydraulic systems capable of numerical control use electro-hydraulic servo systems, which are mainly composed of electronic and electrical components, electro-hydraulic servo valves, hydraulic actuators, feedback detection components and control objects. The existing problems are: the servo system is particularly sensitive to liquid pollution; the electro-hydraulic servo system requires a pumping station system to provide a constant pressure liquid source; the maximum load pressure provided by the servo valve of the electro-hydraulic servo system is only 2 / 3 of the pressure of the liquid source, The energy waste of the system is serious; due to the low efficiency of the electro-hydraulic servo system, the temperature of the sys...

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Problems solved by technology

The existing problems are: the servo system is particularly sensitive to liquid pollution; the electro-hydraulic servo system requires a pumping station system to provide a constant pressure liquid source; the load pressure provided by the servo valve of the electro-hydraulic servo system is only 2 / 3 of the pressure of the liquid source at most. Serious waste of energy in the system; due to the low efficiency of the electro-hydraulic servo system, the temperature of the system liquid rises, so the system needs to be equipped with a cooling device, resulting in increased system size and complexity, and increased costs

The valveless electro-hydraulic servo system has the following forms: AC servo motor plus quantitative pump, AC asynchronous motor frequency conversion speed regulation plus quantitative hydraulic pump, AC asynchronous motor plus variable pump, etc.; due to the large starting current of the motor itself, starting and overload Small torque, complex speed regulation and torque control, unsatisfactory speed regulation performance, waste of energy and other defects, it is difficult to popularize and use

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