Embedded electromagnetic-elastic foil gas mixing bearing

Abstract

The invention discloses an embedded electromagnetic-elastic foil gas mixing bearing, which comprises an electromagnetic bearing arranged in a bearing base, wherein the electromagnetic bearing is provided with a left end cover and a right end cover in an axial direction, an elastic foil bearing is embedded and sleeved between the left and right end covers and a rotor journal, the electromagnetic bearing is provided with a magnetic pole which has a coil, the left and right end covers are arranged in a branch opening at the root of the magnetic pole to form a bearing base of a foil bearing; and the bearing base of the oil bearing is provided with a groove, a top elastic foil and a bottom elastic foil are inserted into the groove, and when the coil is switched on, an electromagnetic field is formed between a pole shoe of the magnetic pole and the rotor journal, so that the pole shoe attracts the rotor journal. At a low speed, a rotor is supported by the electromagnetic bearing; when the rotating speed reaches a certain value, a gas film between the top foil and the journal generates a dynamic pressure; and at a high speed, the rotor is individually supported. The embedded electromagnetic-elastic foil gas mixing bearing has the characteristics of low power consumption, high precision, high bearing capability and compact structure.

Description

technical field [0001] The invention belongs to the technical field of high-speed oil-free lubricating support equipment, in particular to an inlaid electromagnetic-elastic foil gas hybrid bearing. Background technique [0002] The electromagnetic bearing is a non-mechanical contact sliding bearing that uses electric field force and magnetic field force to suspend the shaft through the control system. It does not need lubrication and sealing, which can completely eliminate wear and reduce power consumption; at the same time, it is controllable and can control the position of the rotor. Active control is carried out, and the stiffness and damping of the bearing can be adjusted through the control system, which has good designability; in addition, the electromagnetic bearing also has the advantages of long life, wide working temperature range (-253~+450℃), automatic balance, etc. . However, due to the magnetic saturation of materials and electromagnetic heating, the bearing c...

AI Technical Summary

Problems solved by technology

However, since the elastic foil gas bearing uses gas as the lubricating medium, its bearing capacity is relatively low under the low-speed operation of the rotor, and the damping and stiffness are relatively low; There is friction between them, so the wear is relatively large, and the coating on the bearing is easy to peel off

[0004] In order to make up for the shortcomings of the two, the structure of the electromagnetic-elastic foil gas hybrid bearing is proposed. On the one hand, it can improve the damping, stiffness, and bearing capacity of the magnetic bearing system, and on the other hand, it can overcome the uncontrollable shortcomings of the gas bearing. The ideal bearing for high-speed spindles has universal scientific significance and huge social and economic benefits, but how to install them reasonably and achieve a good complementary effect under the premise of ensuring normal work is still a major difficulty.

Images