Rotor weight self-adaptive type permanent magnet thrust bearing

Abstract

A permanent magnet thrust bearing for self adaptation runner weight, comprises a stator, a runner, an auxiliary radial bearing with air gap between the stator and the runner. The stator is made of n pairs of alternating magnetizing permanent magnet ring stacked and the non magnet conductive ring clipped between adjacent permanent magnet rings. The runner is made of m pairs of alternating magnetizing permanent magnet ring stacked and the non magnet conductive ring clamped between adjacent permanent magnet rings. Among them, n and m are all natural numbers. The permanent magnet thrust shaft uses the stator and the runner's permanent magnet ring to bear the weight of the runner along the axis, assisting the radial bearing to distribute the radial force, in order to realize the balance on each freedom degree, with big axle thrust force, simple structure, convenient loading, self adaptation runner weight, difficult to lose magnet, and free from lubricant and cooling. It is especially fit for the occasion that requires for large scale thrust bearings.

Description

technical field [0001] The invention relates to a permanent magnet thrust bearing, in particular to a permanent magnet thrust bearing which adapts to the weight characteristics of a rotor, and is suitable for application occasions such as hydraulic turbine rotors and flywheel systems that require large thrust bearing support. Background technique [0002] At present, the mechanical thrust cylindrical roller bearings and thrust ball bearings widely used in industry have the limitations of limited thrust per unit area, easy wear, lubrication, and high price. The characteristics of permanent magnetic materials such as large coercive force, strong residual magnetism, large magnetic energy product, and approximately linear demagnetization curve make it possible for permanent magnetic bearings to replace traditional mechanical bearings. At the same time, with the rapid commercialization of high-performance rare earth permanent magnet materials and the development of corresponding ...

AI Technical Summary

Problems solved by technology

A small number of related patents related to permanent magnet thrust bearings, such as the permanent magnet full magnetic levitation thrust bearing disclosed in Chinese patent CN2632381, directly use the repulsion between the central permanent magnet blocks with the same polarity to carry out axial suspension, and use the peripheral permanent magnets with opposite polarities The suction between the blocks remains radially stable, which is actually an ideal suspension, which fails to take into account the difficulty of processing, the short circuit of the magnetic force line, the loss of magnetism, stiffness, stability and other practical problems.

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