MEMS micropump-based solid-liquid composite lubricated shafting for flywheel

Abstract

The invention belongs to the technical field of space tribology, and relates to an MEMS micropump-based solid-liquid composite lubricated shafting for a flywheel. The shafting comprises a first MEMS micropore reinforced solid film lubricated ceramic bearing, an MEMS micropump oil storage-oil supply system, a second micropore reinforced solid film lubricated ceramic bearing, a main shaft, an internal support sleeve, an external support sleeve and an oil reservoir. The shafting can provide effective support and lubrication for an internal rotor motor and an outer rotor motor, and utilizes a liquid composite lubrication mode that the MEMS micropore reinforced solid film lubricated ceramic bearings and an MEMS micropump supply oil accurately. A shafting lubricating system adopts an oil storage device, an oil supply device and a maintaining device which consist of a cavity oil reservoir, the MEMS micropump and a labyrinth seal to make the shafting have excellent lubrication properties and friction properties within the wide rotating speed range from static starting to high-speed operation, so that the initial running is improved effectively, the starting occlusion is prevented, and simultaneously, the control accuracy, service life and reliability of the shafting are improved at low speed.

Description

technical field [0001] The invention belongs to the technical field of space tribology, and relates to a solid-liquid composite lubricating shaft system for a flywheel based on a MEMS micropump. Background technique [0002] The development of satellites requires that the attitude control system has high precision and long life and can provide precise control torque, so more and more flywheel three-axis attitude stabilization systems are used. The space attitude control flywheel is generally composed of a rotor, a shaft system, a brushless DC motor and a sealed casing. Shafting is a key component in the flywheel, and its design directly determines the control accuracy, reliability and life of the flywheel. [0003] Flywheels for attitude control are divided into two types: offset momentum wheels and reaction flywheels. The average speed of the offset momentum wheels is generally 2000-3000 rpm, and the flywheel rotates in one direction; rotate in one direction. Compared wi...

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Problems solved by technology

[0006] Aiming at the problems of large friction torque near zero speed, severe wear, and low control precision in current flywheels, the present invention provides a solid-liquid composite lubrication shaft system for space flywheels based on MEMS micropumps, which can be used for inner rotor flywheel motors and The outer rotor flywheel motor provides effective support, through the use of MEMS micropore-enhanced solid film lubricated ceramic bearings + MEMS micro-pump liquid compound lubrication method for precise oil supply, the shaft lubrication system adopts a cavity oil reservoir-MEMS micro-pump-labyrinth The oil storage, oil supply and holding device composed of seals make the shafting have good lubricating and frictional characteristics in a wide speed range from static start to high-speed operation, effectively improve the initial run-in and prevent start-up seizure, and at the same time improve the shafting performance. Control accuracy, service life and reliability near zero speed

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