Permanent magnet biased magnetic suspension bearing

Abstract

The invention discloses a permanent magnet biased magnetic suspension bearing. The permanent magnet biased magnetic suspension bearing comprises an axial magnetic suspension bearing and a radial magnetic suspension bearing placed in the axial magnetic suspension bearing, and a permanent magnet is connected with an axial magnetic conductive ring and a radial stator iron core and provides axial andradial biased magnetic fields at the same time; the front face and the rear face of a conical thrust disc are planes and form an axial magnetic gap with the axial magnetic conductive ring; axial coilsare located on the upper side and the lower side in the axial magnetic conductive ring and provide an axial control magnetic field; a conical hole is formed in the center of the radial stator core, and a conical rotor lamination is arranged outside the conical thrust disc; the peripheral edge of the outer side of the conical rotor lamination is conical, and the conical surface of the edge is parallel to the surface of the conical hole of the radial stator core to form a conical radial magnetic gap; and radial magnetic flux generates a force perpendicular to the radial conical surface at eachradial magnetic pole, so that the radial magnetic bearing can provide an axial unloading force while outputting a radial force, the effect that a relatively small axial current and a relatively smallaxial thrust disc can provide a large axial load is realized, and the burden of an axial magnetic bearing is reduced. The structure has the advantages of high space utilization rate, small size and low power consumption.

Description

technical field [0001] The invention relates to the technical field of non-contact magnetic bearings, in particular to a small-volume, low-power permanent magnetic bias three-degree-of-freedom magnetic suspension bearing, which can be used as non-contact support for rotating parts in mechanical equipment such as compressors, blowers, and molecular pumps. Background technique [0002] Magnetic suspension bearings have the advantages of no friction, no wear, high speed, easy control and long life. Since there is no mechanical contact between the stator and the rotor, the rotor of the magnetic bearing can reach a very high speed, so in high-speed rotating machinery, the magnetic bearing has unique advantages. When magnetic bearings are used in blowers, compressors, etc., the pressure difference between the inlet and outlet of the impeller produces a very large axial load on the rotor, so higher requirements are put forward for the design of axial magnetic bearings. In order to...

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Problems solved by technology

[0003] 1. Increase the axial stator coil current. This method will increase the copper consumption of the coil, increase the coil temperature, and increase the loss. At the same time, the large current will limit the selection of electronic power devices

[0004] 2. Increase the radius of the thrust disc. This method will increase the wind friction loss of the rotor, increase the linear speed of the rotor surface, reduce the safety margin of the rotor dynamics, and reduce the stability of the system control.

[0006] It can be seen that under the existing technical means, to improve the axial bearing capacity, it will affect other performance indicators such as loss and volume.

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