Magnetic Bearing Control Device Vibration Mode Classification
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Solution Overview
Problem
Existing control devices for magnetic bearings face challenges in stabilizing high-speed rotary machines, particularly when the rotor's center of gravity is transversely asymmetric, as they struggle to accurately classify vibration modes, leading to increased load on the control device and difficulty in stabilization design.
Innovation Solution
A control device for magnetic bearings that includes electromagnets at both ends of a shaft member and an inclination measuring device to measure and control magnetic attraction forces based on the inclinations at each end, allowing for accurate classification of vibration modes into parallel and conical modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If vibration modes are classified to reduce control device load, then control device load is reduced, but when center of gravity is transversely asymmetric, vibration modes cannot be properly classified
Solution Approach 1:
The invention segments the vibration analysis by measuring inclinations at both ends of the rotor separately. By dividing the measurement into two independent inclination measurements (first inclination at one end, second inclination at other end), the system can accurately classify vibration modes even when the center of gravity is transversely asymmetric, thereby maintaining low control device load while ensuring classification accuracy.
2Measurement precision
If inclination measuring device is added to measure both end inclinations, then vibration mode classification accuracy is improved, but device complexity increases
Solution Approach 1:
The inclination measuring device is designed with multi-functionality, serving both to measure the first inclination at one end and the second inclination at the other end of the rotor. This universal measurement approach enables accurate vibration mode classification without requiring separate specialized measurement systems for each end, thereby improving classification accuracy while controlling device complexity.
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 solution reduces the load on the control device and facilitates stabilization design by reliably classifying vibration modes, enabling effective control of magnetic bearings for high-speed rotary machines with asymmetric center of gravity.
Implementation Method 1
a magnetic bearing including electromagnets at one and the other end sides of a shaft member and supporting the one and the other end sides of the shaft member contactlessly by a magnetic attraction force of the electromagnets
Data Source
AI summary
The present invention is to reduce the load on a control device by reliably classifying vibration modes of a rotor, thereby facilitating stabilization design of a magnetic bearing. The present invention includes: magnetic bearings including electromagnets provided at one end and the other end of a rotor to contactlessly support the one end and the other end of the rotor by the magnetic attraction forces of the electromagnets; and displacement sensors that measure an inclination at the one end of the rotor and an inclination at the other end of the rotor, in which the magnetic attraction forces of the electromagnets are controlled based on the inclinations measured by the displacement sensors.