Non-Centrosymmetric Stator Core for Higher Maglev Bearing Force
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Solution Overview
Problem
Existing radial magnetic levitation bearings require a large volume and high power consumption due to the need for increased coil turns or currents to overcome rotor gravity, leading to inefficiencies and increased costs.
Innovation Solution
A stator core with a non-centrosymmetric structure, featuring an annular yoke with a non-coincident axis for the inner and outer circumferential walls, which increases the cross-sectional area of the magnetic path in certain regions, thereby enhancing the output force while reducing the working current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a symmetrical stator core structure is used, then the structure is simple and easy to manufacture, but the output force is insufficient and requires larger current to overcome rotor gravity
Solution Approach 1:
The patent applies asymmetry by designing a non-centrosymmetric stator core structure where the inner and outer circumferential walls have different cross-sectional areas. Specifically, the first yoke part has a larger cross-sectional area than the second yoke part, creating an asymmetric magnetic path that generates unequal electromagnetic forces. This asymmetry allows the bearing to generate sufficient output force to overcome rotor gravity without requiring increased current, thereby resolving the contradiction between force output and power consumption.
2Force
If coil turns or current are increased to increase output force, then the electromagnetic force can overcome rotor gravity, but the volume and power consumption of the magnetic levitation bearing increase
Solution Approach 1:
The patent applies local quality by creating different cross-sectional areas in different parts of the yoke structure. The first yoke part has a larger cross-sectional area than the second yoke part, which means the magnetic path has different magnetic conductances in different regions. This local variation in magnetic path properties allows the bearing to generate the required electromagnetic force without uniformly increasing the overall volume or coil turns, thus resolving the contradiction between force output and volume.
3Force
If coil turns or current are increased to increase output force, then the electromagnetic force can overcome rotor gravity, but the power consumption of the magnetic levitation bearing increases
Solution Approach 1:
The patent applies asymmetry by designing a non-centrosymmetric stator core structure where the inner and outer circumferential walls have different cross-sectional areas. Specifically, the first yoke part has a larger cross-sectional area than the second yoke part, creating an asymmetric magnetic path that generates unequal electromagnetic forces. This asymmetry allows the bearing to generate sufficient output force to overcome rotor gravity without requiring increased current, thereby resolving the contradiction between force output and power consumption.
4Force
If a symmetrical stator core structure is used, then the structure is balanced, but the cross-sectional area of the magnetic path is insufficient to generate adequate electromagnetic force
Solution Approach 1:
The patent applies local quality by creating different cross-sectional areas in different parts of the yoke structure. The first yoke part has a larger cross-sectional area than the second yoke part, which means the magnetic path has different magnetic conductances in different regions. This local variation in magnetic path properties allows the bearing to generate the required electromagnetic force without uniformly increasing the overall volume or coil turns, thus resolving the contradiction between force output and volume.
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
The non-centrosymmetric stator core design increases the output force of the magnetic levitation bearing while minimizing the working current, resulting in improved reliability, stability, reduced silicon steel sheet loss, lower costs, and reduced weight.
Implementation Method 1
each of the plurality of pole pillars extends towards an axis of the inner circumferential wall... each magnetic pole generates an electromagnetic force on each freedom degree by means of the coil current
Implementation Method 2
each magnetic pole generates an electromagnetic force on each freedom degree by means of the coil current. The generated electromagnetic force is mainly used to overcome the gravity of the rotor
Data Source
AI summary
The present disclosure provides a stator core, a magnetic levitation bearing, and a motor. The stator core is used in the magnetic levitation bearing and includes an annual yoke. The annular yoke has an inner circumferential wall and an outer circumferential wall, a plurality of pole pillars are disposed on the inner circumferential wall, and each of the plurality of pole pillars extends towards an axis of the inner circumferential wall, there is a distance D between an axis of the outer circumferential wall and the axis of the inner circumferential wall, and D≠0 is satisfied. According to the stator core, the magnetic levitation bearing, and the motor of the present disclosure, the stator core has a non-centrosymmetric structure, so that a cross-sectional area of a magnetic path in some region of the stator core is increased, which is beneficial to an improvement of an output force of the magnetic levitation bearing.