High-stiffness high-damping axial passive magnetic bearing with magnetic circuit decoupling function

Abstract

The invention discloses a high-stiffness high-damping axial passive magnetic bearing with a magnetic circuit decoupling function. The high-stiffness high-damping axial passive magnetic bearing comprises a stator system and a rotor system; the stator is connected with a base of equipment, and the rotor system is connected with a rotating part of the equipment. The stator system mainly comprises mounting sleeves, magnetic conducting rings, magnetic isolating rings, pieces of radial magnetizing magnetic steel, pieces of axial magnetizing magnetic steel, paramagnetic rings, magnetic steel lock nuts, fixing seats, and assembly lock nuts; and the rotor system mainly comprises rotating shafts, rotor magnetic isolating rings, rotor magnetic conducting rings, damping sleeves, rotor magnetic isolating rings and rotor assembly lock nuts. According to the high-stiffness high-damping axial passive magnetic bearing, the multiple circles of magnetic steel are adopted to enable magnetic flux to converge, the magnetic field intensity of an air gap is improved, and high-stiffness supporting is realized; through the scheme of internal arranging of the magnetic steel, the magnetic flux density uniformity of the air gap is improved, and interference force to the rotor system is not generated; high damping is achieved through the multiple circles of damping sleeves, in addition, all magnetic circuits are closed, magnetic flux leakage is reduced, and the utilizing rate of the magnetic flux is increased; and a magnetic flux loop for supporting and a magnetic flux loop realizing damping are mutually decoupled, and thus optimized design can be conducted on the supporting stiffness and damping of the magnetic bearing.

Description

technical field [0001] The invention relates to a non-contact magnetic suspension bearing, in particular to a high-rigidity and high-damping axial passive magnetic bearing decoupled from a magnetic circuit, which can be used for non-contact support of rotating parts in mechanical equipment such as motors, machine tools, and magnetic suspension platforms. Background technique [0002] Magnetic bearings can be divided into active magnetic bearings and passive magnetic bearings. Active magnetic bearings often use high-precision displacement sensors and high-quality controllers to control the attitude of the suspended rotor, which can suppress the vibration of the rotor, but the cost is high, the system is complex, and the reliability is low. Passive magnetic bearings do not require feedback control systems and power supplies, and have the advantages of low cost, high system reliability, and low loss. However, most passive magnetic bearings lack effective damping effect, and th...

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Problems solved by technology

Chinese patent 200510011689.9 proposes a passive axial magnetic suspension bearing with damping effect, which realizes the integration of axial passive magnetic bearing and damper, but the supporting force is small and the axial dimension is large. Chinese patent 201710260008.5 proposes a Halbach permanent bearing with damping effect The magnetically passive axial magnetic suspension bearing uses the Halbach permanent magnet array to increase the support stiffness, but the radial dimension is relatively large. The above two patents integrate the passive magnetic bearing and the damper to reduce the volume and weight of the system, but the designed The magnetic circuit does not form a closure, and there are more magnetic flux leakage, which fails to make full use of the magnetic flux generated by the magnetic steel, resulting in low suspension support accuracy, low support stiffness and damping

Chinese patent 201110276772.4 proposes a permanent magnet passive axial magnetic suspension bearing with passive damping effect, but the magnetic flux used to support the rotor suspension and the magnetic flux generating damping effect are coupled with each other, and it is difficult to optimize the design of the respective magnetic circuits to achieve high stiffness and high damping

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