Combined Permanent Magnet Maglev Bearing for Passive Self-Stabilization
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Solution Overview
Problem
Existing maglev bearing technologies face instability due to Earnshaw's Theorem, which prohibits the design of stable all-permanent magnet maglev bearings, leading to high energy consumption and complex control systems in hybrid or active maglev solutions, and limited applicability of diamagnet and superconductor technologies.
Innovation Solution
A combined self-stabilizing maglev bearing design incorporating a first axial and second radial maglev bearing on a rotating shaft, with each bearing comprising magnetic rings and short circuit rings, achieving negative-feedback stabilization through opposing polarities and symmetrical arrangements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If permanent magnet repulsion or attraction solutions are used, then autonomous restoring force in the target direction increases, but lateral unstable force increases synchronously
Solution Approach 1:
The patent divides the bearing into two independent functional modules: a radial maglev bearing for radial levitation and an axial maglev bearing for axial levitation. Each module independently provides restoring force in its specific direction without generating unstable forces in other directions, thereby resolving the contradiction between restoring force and lateral stability.
Solution Approach 2:
The patent transitions from a single bearing attempting to provide both radial and axial levitation to a combination of two bearings operating in different dimensional planes. The radial bearing handles radial forces while the axial bearing handles axial forces, effectively separating the force dimensions and eliminating cross-directional instability.
2Stability of the object's composition
If hybrid bearing solutions or active electromagnetic control are used, then bearing stability is improved, but energy consumption and system complexity increase
Solution Approach 1:
The patent employs passive permanent magnet repulsion in both radial and axial bearings to achieve self-stabilization without requiring external power sources or electronic control systems. The magnetic repulsion forces automatically provide restoring forces when displacement occurs, enabling the bearing to self-correct and maintain stability autonomously.
Solution Approach 2:
The patent extracts and eliminates the electromagnetic control system and power supply components from the bearing structure, relying solely on passive permanent magnet interactions. This removal of active control elements directly reduces device complexity while maintaining stability through magnetic field design.
3Ease of operation
If permanent magnet repulsion solution is used, then autonomous levitation is achieved, but magnetic circuit loss is large and bearing capacity is compromised
Solution Approach 1:
The patent combines radial and axial maglev bearing structures into an integrated assembly where the stator and rotor components of one bearing serve dual functions. The magnetic rings and pole pieces are shared between radial and axial levitation functions, creating a unified magnetic circuit that reduces overall magnetic path length and minimizes energy losses.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables static and dynamic autonomous levitation stabilization, reducing energy consumption and costs while improving reliability, applicable in green energy, machine manufacturing, aerospace, and silent motion carriers.
Implementation Method 1
due to the repulsions or attractions of permanent magnets, the directional autonomous stabilization (also known as fluctuation stabilization) of a bearing at certain degrees of freedom can be achieved
Implementation Method 2
a short circuit ring is arranged between the magnetic rings
Data Source
AI summary
An all-permanent magnet combined self-stabilizing maglev bearing includes a first axial maglev bearing and a second radial maglev bearing arranged on a same rotating shaft, wherein the first axial maglev bearing achieves radial magnetization and axial levitation stabilization, and the second radial maglev bearing achieves axial magnetization and radial levitation stabilization; and the first axial maglev bearing and the second radial maglev bearing each include a stator, a rotor and a rotor bushing, the stator and the rotor being composed of magnetic rings, the rotor is fixed on the rotating shaft by the rotor bushing, and a short circuit ring is arranged between the magnetic rings. The all-permanent magnet self-stabilizing maglev bearing achieves the axial magnetization and radial stabilization of bearings and the radial magnetization and axial stabilization of bearings.