Rotor Unbalance Measurement Using Single Angle Reference
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Solution Overview
Problem
Existing methods for acquiring the unbalance of a rotor and a balancing machine require multiple angle reference points, which can lead to inaccuracies due to misusage and difficulty in achieving precise angle adjustments.
Innovation Solution
A method using only one angle reference point on the rotor, where the angle sensor on the balancing machine is moved between two positions to measure the unbalance, allowing for vector calculation to decompose the unbalance of the rotor and the balancing machine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple angle reference points are set on the rotor, then the unbalance measurement can be performed from different positions, but the complexity of the measuring process increases and the risk of misusage rises
Solution Approach 1:
The invention extracts the angle reference function from multiple reference points on the rotor and consolidates it into a single angle reference point. The angle sensor on the balancing machine detects the angular position relative to this single reference point, eliminating the need for multiple reference points while maintaining the capability to perform measurements from different angular positions.
Solution Approach 2:
The single angle reference point on the rotor serves as a universal reference for all angular measurements. By combining this single reference point with an angle sensor that can detect positions at different angular locations, the system achieves multi-position measurement capability without requiring multiple reference points, thus reducing complexity while maintaining versatility.
2Adaptability or versatility
If the angle sensor is moved to different positions on the balancing machine, then the unbalance angle of the rotor can be changed relative to the reference point, but the positioning precision requirement increases
Solution Approach 1:
The invention replaces the need for precise mechanical positioning of the angle sensor with an electronic/digital angle measurement system. The angle sensor detects the angular position of the single reference point on the rotor, and the control unit calculates the unbalance angle based on these angular positions, eliminating the need for high-precision mechanical angle adjustments.
Solution Approach 2:
The system changes the angular position parameter of the angle sensor relative to the single reference point on the rotor. By measuring at different angular positions and using vector calculation, the system can determine the unbalance angle without requiring the sensor to be positioned at precisely predetermined angles, thus reducing manufacturing precision requirements.
3Reliability
If material is used to create reference points on the rotor, then the reference points can be physically marked, but the mass of the reference point material influences the unbalance of the rotor
Solution Approach 1:
The invention extracts the reference function from physical material markers on the rotor and implements it through a non-contact or minimal-contact angle reference system. The single angle reference point is marked in a way that does not add significant mass, and the angle sensor detects its position without requiring substantial material, thus eliminating the influence of reference point mass on rotor unbalance.
Data Source
Figure 1
Figure 2~3(b)
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AI summary
This invention provides a method to acquire the unbalance of a rotor and a balancing machine, in which, the method to acquire the unbalance of a rotor includes the following procedures: install angle sensor at first position on balancing machine, measure the unbalance of rotor, first unbalance in measuring plane 1 and first unbalance in measuring plane 2 can be measured. Move angle sensor on balancing machine from first position to second position, measure the unbalance of the rotor again, second unbalance in measuring plane 1 and second unbalance in measuring plane 2 can be measured. In the above mentioned two measurements, the unbalance amount of rotor has no change, but the unbalance angle relative to angle reference point on rotor is changed by an angle which equals the angle of the sensor being moved. The unbalance amount and angle of balancing machine itself has no change. By vector calculation, the unbalance of rotor is obtained. Measurement procedure is simple, and testing is accurate.