Parallel-Magnetized Magnetic Bearing for Turbo Machine Production
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Solution Overview
Problem
Conventional magnetic bearing structures face difficulties in efficiently magnetizing donut-shaped permanent magnets, which complicates the production process and reduces productivity due to the need for perpendicular magnetization, making it challenging to divide magnetic field paths effectively.
Innovation Solution
A magnetic bearing structure featuring a ring-shaped permanent magnet magnetized in parallel with the shaft direction, accompanied by a conductor and coil to form a magnetic field path, with a support contacting the permanent magnet and a non-magnetic material filling the empty space, allowing for easy magnetization and improved productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a donut-shaped permanent magnet is used in a magnetic bearing, then the magnetic field paths of the electromagnet and permanent magnet can be divided, but the permanent magnet must be magnetized perpendicular to the shaft direction which makes magnetization difficult and reduces production efficiency
Solution Approach 1:
The patent inverts the conventional magnetization approach by magnetizing the permanent magnet in the shaft direction (parallel to the rotation shaft) rather than perpendicular to it. This is achieved by positioning the permanent magnet between two pole pieces with opposite polarities facing each other, creating a magnetic field that magnetizes the permanent magnet in the desired shaft direction, thereby simplifying the magnetization process while maintaining effective magnetic field path division.
Solution Approach 2:
The patent introduces pole pieces as intermediary elements between the electromagnet and the permanent magnet. These pole pieces with opposite polarities serve as mediators to guide and shape the magnetic field, enabling the permanent magnet to be magnetized in the shaft direction while maintaining proper magnetic field path division. The pole pieces facilitate the magnetic field configuration without requiring complex direct magnetization of the permanent magnet.
2Reliability
If a donut-shaped permanent magnet is used with perpendicular magnetization, then magnetic field paths can be divided, but production efficiency of magnetic bearings deteriorates
Solution Approach 1:
The patent inverts the conventional magnetization approach by magnetizing the permanent magnet in the shaft direction (parallel to the rotation shaft) rather than perpendicular to it. This is achieved by positioning the permanent magnet between two pole pieces with opposite polarities facing each other, creating a magnetic field that magnetizes the permanent magnet in the desired shaft direction, thereby simplifying the magnetization process while maintaining effective magnetic field path division.
Solution Approach 2:
The patent changes the magnetization direction parameter from perpendicular to the shaft direction to parallel with the shaft direction. This parameter change is achieved through the specific arrangement of pole pieces that generate a magnetic field in the shaft direction during assembly, transforming the magnetization process into a simpler operation that can be performed during standard assembly procedures, thereby improving production efficiency.
3Reliability
If a permanent magnet is used to form bias magnetic force, then the rotation body can be stably supported, but additional bias current is required which increases energy consumption
Solution Approach 1:
The patent applies the self-service principle by using the permanent magnet to automatically generate the bias magnetic field without requiring external energy input. The permanent magnet inherently produces the magnetic field needed for stable support of the rotation body, eliminating the need for additional bias current and reducing energy consumption while maintaining reliable rotational support.
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 configuration allows for effective division of magnetic field paths between the electromagnet and permanent magnet, eliminating the need for additional bias current and facilitating magnetization in the desired direction, thereby enhancing the efficiency and ease of production of magnetic bearings.
Implementation Method 1
a ring-shaped permanent magnet provided on a side of the rotation shaft and magnetized in a direction in parallel with a shaft direction of the rotation shaft
Implementation Method 2
a conductor installed on an external side of the permanent magnet and used to form a magnetic field path; and a coil installed inside the conductor
Implementation Method 3
The magnetic bearing device levitates a rotation body and supports it according to a magnetic force generated by an electromagnet
Data Source
AI summary
Disclosed is a magnetic bearing structure including a permanent magnet, levitating a rotation body without a bias current, and easily magnetizing the permanent magnet. The magnetic bearing structure includes a ring-shaped permanent magnet provided on a side of a rotation shaft and magnetized in a direction parallel with a shaft direction of the rotation shaft, a coil installed on a side of the permanent magnet, and a conductor installed on an external side of the coil and used to form a magnetic field path. According to the configuration, when an additional bias current is not supplied to the coil installed in the magnetic bearing, a rotation body levitates according to the magnetic field caused by the permanent magnet, and a magnetized direction of the permanent magnet is in parallel with a shaft direction of the rotation shaft thereby allowing easy magnetization and increasing productivity of the magnetic bearing.