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Design method for permanent magnet bias axial magnetic bearing

A technology of axial magnetic bearing and design method, applied in the direction of shaft and bearing, bearing, mechanical equipment, etc., can solve the problems of not considering the influence of displacement stiffness, difficult to control, and unreasonable size of permanent magnet.

Inactive Publication Date: 2007-04-11
BEIHANG UNIV
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Problems solved by technology

The existing design methods of magnetic bearings all use the best working point of the permanent magnet to design, the purpose is to minimize the volume of the permanent magnet, but the size of the permanent magnet calculated by this method is often unreasonable, and it leads to processing difficulties. The impact of displacement stiffness on the control system, so the existing design methods have the defects of poor accuracy and difficult control

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  • Design method for permanent magnet bias axial magnetic bearing
  • Design method for permanent magnet bias axial magnetic bearing
  • Design method for permanent magnet bias axial magnetic bearing

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Embodiment Construction

[0056] As shown in Figure 1, the design object of the present invention is a permanent magnetic bias axial magnetic bearing for a magnetic levitation flywheel. Among the figures, 1 is a magnetic yoke, 2 is a second air gap, 3 is a permanent magnet, and 4 is a coil. 5 is the bearing body, 6 is the magnetic air gap between the bearing body (also known as the stator) and the thrust disc, and 7 is the thrust disc. Set the displacement stiffness K of the axial magnetic bearing according to the requirements of the existing magnetic bearing controller x It is -0.7N / um, and the air gap length δ is set to 0.25mm according to the existing processing level. The second air gap loses too much magnetomotive force, so the length of the second air gap should be slightly greater than twice the length of the air gap, and here the second air gap δ 1 According to the magnetic field analysis of the magnetic bearing, the magnetic leakage coefficient σ is set to 1.3, and the maximum bearing capacit...

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Abstract

The design method of axial magnetic bearing with permanent magnetic bias has the displacement rigidity of the magnetic bearing as main consideration, and the maximum bearing capacity, saturation magnetic induction and tankful rate as restraint conditions. Compared with available design method with optimal work point of the permanent magnet as target, the method of the present invention has the advantages of easy control of radial magnetic bearing, reasonable permanent magnet size, high accuracy, and being simple and practical. The design philosophy of the present invention may be used in design of different kinds of axial magnetic bearing with permanent magnetic bias.

Description

technical field [0001] The invention relates to a design method of a non-contact magnetic suspension bearing, in particular to a design method of a permanent magnetic bias axial magnetic bearing for a magnetic suspension flywheel, a magnetic suspension control moment gyroscope, and other devices that require magnetic suspension support. The design idea can be used as various Design of permanent magnet offset axial magnetic bearings. Background technique [0002] Magnetic suspension bearings are divided into pure electromagnetic bearings and hybrid magnetic suspension bearings with permanent magnetic bias and electromagnetic control. The former uses large current and consumes a lot of power, and the hybrid magnetic suspension bearings with permanent magnetic bias and electromagnetic control. The magnetic field generated by the permanent magnet bears the main load. Bearing capacity, the electromagnetic field provides auxiliary adjustment bearing capacity, so this kind of beari...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C32/04
CPCF16C32/0465F16C32/0476
Inventor 房建成孙津济王曦杨磊
Owner BEIHANG UNIV