High-power-density moving-coil type electromagnetic direct-drive hydraulic pump

Abstract

The invention relates to a high-power-density moving-coil type electromagnetic direct-drive hydraulic pump. The high-power-density moving-coil type electromagnetic direct-drive hydraulic pump comprises magnetic yokes, permanent magnet arrays, an end cover, hydraulic cylinder bodies, a valve body, a coil framework, coils, pistons, a centering spring and a one-way valve. The high-power-density moving-coil type electromagnetic direct-drive hydraulic pump is characterized in that double Halbach permanent magnet array layers formed by alternately and closely arranging axial magnetizing permanent magnets and radial magnetizing permanent magnets are adopted to be attached to the outer side of the inner magnetic yoke and the inner side of the outer magnetic yoke in a surface mode correspondingly,wherein an air gap is formed between the inner magnetic yoke and the outer magnetic yoke, and the magnetic yokes are fixedly connected with the end cover and the hydraulic cylinder bodies to serve asstators; a coil set is wound on the framework and placed in the air gap; the winding directions of the adjacent coils are opposite; the framework and the two hydraulic cylinder pistons are integrated;the pistons are directly driven to reciprocate, meanwhile, liquid pumping is completed in two hydraulic cylinders, and the pistons serve as rotors; and the centering spring, a hydraulic pump rotor and the hydraulic pump stators jointly form a resonance system, and the centering spring is in a compressed state all the time. The working efficiency and the power density of the hydraulic pump are effectively improved through the technologies of electromagnetic direct drive, the double Halbach permanent magnet array layers, a symmetrical working cavity, the centering spring and the like.

Description

technical field [0001] The invention relates to the technical field of hydraulic pumps, in particular to an electromagnetic direct-drive hydraulic pump. Background technique [0002] Compared with other types of hydraulic pumps, the plunger pump has the advantages of high rated pressure, compact structure, high efficiency and convenient flow adjustment. actuators and other fields. At present, the most commonly used plunger pump is generally the swash plate plunger pump, which has complex structure, many friction pairs, low power density, poor heat dissipation, and insufficient dynamic response performance, which limits the further expansion of its application field. [0003] With the improvement of linear motor control precision, the emergence of new permanent magnet materials and the improvement of processing precision, linear motors with different structures, different working principles and different applications emerge in an endless stream. At the same time, the driving...

AI Technical Summary

Problems solved by technology

However, the direct drive motor of the general electromagnetic direct drive plunger pump is outside the pump body and is fixedly connected to the piston through the extension rod. Pump Technology Development

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