Coaxial Magnetic Bearing Layout for Colocated Displacement Sensing
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Solution Overview
Problem
Magnetic bearings in existing technologies require separate installation spaces for sensors, leading to increased manufacturing costs and accuracy issues due to non-colocated sensor positioning.
Innovation Solution
A magnetic bearing configuration with a colocated eddy-current displacement sensor, where the sensor units are integrated within the electromagnet unit, reducing installation space and manufacturing costs while addressing sensor noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a separate sensor installation space is provided for the sensor, then the sensor can be installed, but the sensor installation space increases and manufacturing costs increase
Solution Approach 1:
The sensor is integrated into the electromagnet assembly, merging two previously separate components (sensor and electromagnet) into a single unified structure. This eliminates the need for separate sensor installation space and reduces manufacturing costs by consolidating parts and simplifying the assembly process.
Solution Approach 2:
The electromagnet assembly is designed to serve multiple functions: it provides magnetic suspension force and simultaneously houses the sensor for displacement measurement. This multi-functionality allows the same structural space to serve dual purposes, reducing the overall space required and lowering manufacturing complexity.
2Measurement precision
If the sensor is positioned at the side of the bearing, then the sensor can be installed, but the measurement accuracy deteriorates due to non-colocated positioning
Solution Approach 1:
The sensor and electromagnet are merged into a single colocated assembly, ensuring that the sensor is positioned exactly where it needs to be for accurate measurement. This eliminates alignment issues between separate components and ensures the sensor measures displacement at the precise location of the suspended body.
3Measurement precision
If the sensor is positioned away from the suspended body, then the sensor installation is simplified, but sensor noise increases and measurement accuracy deteriorates
Solution Approach 1:
The sensor is integrated into the electromagnet assembly and positioned in close proximity to the suspended body, minimizing the measurement distance. This colocated positioning reduces sensor noise and improves measurement accuracy by eliminating the need for long signal transmission paths and reducing interference from external sources.
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 colocated sensor configuration reduces sensor installation space and manufacturing costs, improves measurement accuracy, and effectively mitigates sensor noise, enhancing the operational efficiency of magnetic bearings.
Implementation Method 1
a plurality of sensor units disposed along an inner periphery of the electromagnet unit and each having two opposite ends respectively coupled to the coil wiring unit and the amplifier unit, the plurality of sensor units being provided between the coil wiring unit and the amplifier unit, in which the sensor unit is disposed colocatedly with a suspended body supported by the electromagnet unit and configured to measure a displacement of the suspended body
Implementation Method 2
magnets or electromagnets with high magnetism are disposed around a rotary shaft, and a suspended body provided in a direction perpendicular to the rotary shaft is levitated by magnet
Data Source
AI summary
A magnetic bearing having a colocated eddy-current displacement sensor, comprising an electromagnet unit including a circular casing having a hollow portion therein, and a plurality of electromagnets disposed along an inner periphery of the casing, an amplifier unit coupled to one side of the electromagnet unit, a coil wiring unit coupled to the other side of the electromagnet unit, and a plurality of sensor units disposed along an inner periphery of the electromagnet unit and each having two opposite ends respectively coupled to the coil wiring unit and the amplifier unit, the plurality of sensor units being provided between the coil wiring unit and the amplifier unit, in which the sensor unit is disposed colocatedly with a suspended body supported by the electromagnet unit and configured to measure a displacement of the suspended body.