Low power consumption permanent magnet biased axial magnetic bearing

Abstract

An axial magnetic bearing consists of a bearing body, an exciting coil, a permanent magnet, a magnetizer ring and an exciting gap. The permanent magnet contacting closely to the bearing body produces magnetic fields in different polarities separately in the inner and outer gaps; the exciting coil wound onto the bearing body generates the exciting magnetic flux; and the magnetizer ring contacting closely to the permanent magnet forms exciting gap between the magnetizer ring and the bearing body for providing the magnetic flux the exciting coil generates with magnetic path. The axial magnetic bearings of the present invention are used in pair in machine and the corresponding parts are made of magnetic permeable material. The present invention has the advantages of low magnetic reluctance, low exciting cut, low power consumption, small size, light weight, easy manufacture, etc. and may be used as the no-contact support for rotating part in machine.

Description

Technical field [0001] The invention relates to a non-contact magnetic suspension bearing, in particular to a low-power permanent magnet bias axial magnetic bearing, which can be used as a non-contact support for rotating parts in mechanical equipment such as motors and machine tools. Background technique [0002] The key to the low power consumption of permanent magnet electromagnetic bearings is to ensure that the magnetic flux generated by the excitation coil does not pass through the permanent magnets. However, some of the existing permanent magnet bias axial magnetic bearing structures are based on ordinary axial electromagnetic bearings. A permanent magnet is placed on the electromagnetic magnetic circuit so that the magnetic flux generated by the control coil passes through the permanent magnet. Since the permanent magnet has a large reluctance, a large excitation current is required for the control coil to generate a certain electromagnetic flux. In addition, some str...

AI Technical Summary

Problems solved by technology

[0002] The key to the low power consumption of permanent magnet electromagnetic bearings is to ensure that the magnetic flux generated by the excitation coil does not pass through the permanent magnets. However, some of the existing permanent magnet bias axial magnetic bearing structures are based on ordinary axial electromagnetic bearings. A permanent magnet is placed on the electromagnetic magnetic circuit so that the magnetic flux generated by the control coil passes through the permanent magnet. Since the permanent magnet has a large reluctance, a large excitation current is required for the control coil to generate a certain electromagnetic flux. In addition, some structures Although the electric excitation magnetic circuit does not pass through the permanent magnet, it passes through the rotor laminated core vertically, which requires a large electric excitation magnetic potential to meet the control requirements, so the existing permanent magnet bias axial magnetic bearing has work Disadvantages of high consumption, large volume and heavy weight

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