A single degree of freedom magnetic bearing

Abstract

The invention discloses a magnetic bearing with single freedom degree. An axial stator cylinder is arranged at the outmost periphery and is coaxially sleeved outside a rotor; the left and right ends of the axial stator cylinder are separately connected with an axial stator circular disc; the outer edges of the two axial stator circular discs are fixedly connected on the inner wall of the axial stator cylinder; gaps are formed between the inner edges of the two axial stator circular discs and the rotor; a radial stator disc is arranged at the axial center of the two axial stator circular discs; the outer edge of the radial stator disc is fixed on the inner wall of the axial stator cylinder and the inner edge is fixedly connected with a permanent magnet; a radial air gap is formed between the permanent magnet and the rotor; the permanent magnet is radially magnetized, the N pole is at the side of the rotor and the S pole is at the side of the radial stator disc; an axial control coil is respectively arranged between one axial stator circular disc and the radial stator as well as the other axial stator circular disc and the radial stator; the two axial control coils are respectively controlled by self switch power amplifier independently. According to the magnetic bearing with single freedom degree, the structure is simplified, the weight is lightened, the axial length is shortened and the critical rotating speed of a suspended rotor is increased.

Description

technical field [0001] The invention belongs to the field of electrical transmission equipment, and relates to a non-contact magnetic suspension bearing, in particular to a single-degree-of-freedom magnetic bearing, which can be used as a non-contact suspension support for high-speed transmission components such as flywheel systems, machine tool electric spindles, and centrifuges. Background technique [0002] The hybrid magnetic bearing provides the static bias magnetic flux by the permanent magnet, and the control magnetic flux by the control current, which has the advantages of reducing the control current and power loss. The hybrid single-degree-of-freedom magnetic bearing has the characteristics of simple structure and relatively low price. Compared with other multi-degree-of-freedom magnetic bearings, it has the highest engineering practical application value. [0003] The Chinese Patent Publication No. is CN102900761A, titled "A Permanent Magnet Bias Axial Hybrid Magn...

AI Technical Summary

Problems solved by technology

[0003] The Chinese Patent Publication No. is CN102900761A, titled "A Permanent Magnet Bias Axial Hybrid Magnetic Bearing". There are magnetic isolation rings on both sides of the circular permanent magnet, but the magnetic flux leakage in the middle part of the magnetic bearing is very large, and the axial The length is long and the critical speed is low, so the application in flywheel system, machine tool electric spindle, centrifuge and other fields is limited

The Chinese patent publication number is CN101526107, and the name is "Hybrid Axial Magnetic Bearing with Permanent Magnets on the Rotor". It is difficult to assemble the permanent magnets on the rotor, and the rotor has low rigidity and small axial bearing capacity.

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