Magnetic Bearing Assembly for Precise Radial Core Positioning
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Solution Overview
Problem
The existing magnetic bearings face challenges in achieving precise positioning of the radial stator core due to the limitations imposed by the accuracy of the permanent magnet, which cannot be machined and results in low positioning accuracy.
Innovation Solution
The magnetic bearing design includes a first axial iron core with an annular positioning boss and a magnetic conductive ring that can be cooperatively connected to both axial and radial positioning surfaces, allowing for precise positioning of the magnetic conductive ring and subsequently the radial iron core, without relying on the accuracy of the permanent magnet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a permanent magnet is directly sleeved on an outside of a radial stator core to reduce magnetic leakage, then magnetic leakage is reduced, but positioning accuracy of the radial stator core deteriorates because the permanent magnet cannot be machined
Solution Approach 1:
The patent introduces a magnetic conductive ring as an intermediary component between the permanent magnet and the radial stator core. This ring serves as a mediator that maintains the magnetic coupling while allowing for precise machining and positioning. The magnetic conductive ring can be accurately machined to provide precise positioning surfaces, thereby resolving the contradiction between reducing magnetic leakage and achieving high positioning accuracy.
Solution Approach 2:
The patent segments the assembly into distinct components: the radial stator core, the magnetic conductive ring, and the permanent magnet. By separating the positioning function (handled by the machinable magnetic conductive ring) from the magnetic function (handled by the permanent magnet), the design allows each component to be optimized independently. The magnetic conductive ring can be precisely machined for positioning, while the permanent magnet focuses on providing the magnetic field.
2Reliability
If the permanent magnet is used to provide magnetic field, then magnetic bearing function is achieved, but positioning accuracy deteriorates because the permanent magnet cannot be machined with high precision
Solution Approach 1:
The magnetic conductive ring acts as an intermediary that decouples the positioning function from the magnetic function. The ring can be precisely machined to provide accurate positioning surfaces for the radial stator core, while the permanent magnet maintains its role in generating the magnetic field. This intermediary component resolves the contradiction by allowing high-precision machining without compromising magnetic bearing functionality.
Solution Approach 2:
The magnetic conductive ring serves as a precise mechanical copy or surrogate for positioning purposes, replacing the need to machine the permanent magnet itself. The ring replicates the positioning function that would otherwise require direct machining of the permanent magnet, but achieves much higher precision through conventional machining methods applied to the conductive ring material.
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
This design enhances the positioning accuracy of the radial iron core by decoupling it from the accuracy of the permanent magnet, thereby improving the overall precision and reliability of the magnetic bearing.
Implementation Method 1
A magnetic conductive ring is arranged in the first accommodating space. The magnetic conductive ring can be cooperatively connected to both the axial positioning surface and the radial positioning surface
Implementation Method 2
By using a permanent magnet to provide a bias magnetic field to replace a static bias magnetic field generated by an electromagnet in an active magnetic bearing
Implementation Method 3
By using attraction or repulsion between magnetic materials to achieve rotor levitation
Data Source
AI summary
Disclosed are a magnetic bearing and a compressor. The magnetic bearing comprises a first axial iron core and a radial iron core, wherein the first axial iron core has a first accommodating space, in which an annular positioning boss is arranged; the annular positioning boss has an axial positioning surface and a radial positioning surface; and a magnetic conductive ring is arranged in the first accommodating space, the magnetic conductive ring can be connected to both the axial positioning surface and the radial positioning surface in a fitting manner to achieve positioning of the magnetic conductive ring in both an axial direction and a radial direction of the first axial iron core, and the magnetic conductive ring is sleeved on an outer circumferential wall of the radial iron core. In the magnetic bearing and the compressor, the positioning of the radial iron core is more accurate, so as to effectively avoid the problem of great positioning accuracy error of a radial iron core in the prior art due to association of the positioning with magnetic steel.