Light Fixture Self-Calibration with Preset Encoder Reference Points
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Solution Overview
Problem
Existing light fixtures with absolute encoders suffer from non-linear positional distortion due to factors like magnet and inductor alignment, leading to positioning inaccuracies and prolonged, noisy calibration processes.
Innovation Solution
A self-calibration method using preset positioning reference points around the absolute encoder, combined with a driving device and stepping motor, allows for quick and collision-free positioning by setting calibrated reference points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the light fixture rotates to a limit position and stops by collision to find an initial position during calibration, then the positioning reference can be established, but the calibration process takes a long time and generates large noise
Solution Approach 1:
The patent applies preliminary action by pre-setting multiple preset positioning reference points around the circumference of the absolute encoder before actual calibration. During calibration, the system rotates the light fixture to these pre-defined reference points rather than relying on collision-based limit position detection, thereby significantly reducing calibration time and avoiding collision noise while maintaining positioning accuracy.
2Measurement precision
If the light fixture rotates to a limit position and stops by collision to find an initial position during calibration, then the positioning reference can be established, but large noise is generated during the process
Solution Approach 1:
The patent applies preliminary action by pre-setting multiple preset positioning reference points around the circumference of the absolute encoder before actual calibration. During calibration, the system rotates the light fixture to these pre-defined reference points rather than relying on collision-based limit position detection, thereby significantly reducing calibration time and avoiding collision noise while maintaining positioning accuracy.
3Productivity
If preset positioning reference points are uniformly distributed around the absolute encoder circumference, then the speed of finding the calibrated positioning reference point increases, but the positioning reference points must be precisely predetermined
Solution Approach 1:
The patent applies segmentation by dividing the circular circumference into multiple discrete preset positioning reference points (e.g., 360 points at 1-degree intervals). This segmentation allows the system to quickly locate calibrated reference points during rotation, significantly improving positioning speed. The uniform distribution of these segmented points around the circumference enables efficient search while maintaining the simplicity of the setup process.
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 method significantly reduces calibration time and eliminates noise during positioning, enhancing the user experience by avoiding the need to rotate to a limit position and stop by collision.
Implementation Method 1
an absolute encoder (1) for indicating a rotation angle of the light fixture
Implementation Method 2
a driving device for driving the light fixture to rotate
Data Source
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AI summary
The present invention relates to a self-calibration method for positioning of a light fixture and a light fixture. An absolute encoder for indicating the rotation angle of the light fixture and a driving device for driving the light fixture to rotate are included. The method includes steps of: S1. setting a plurality of preset positioning reference points around the circumference of the absolute encoder; driving the light fixture to rotate by the driving device and acquiring a corresponding first output value of the absolute encoder at each preset positioning reference point; S2. driving the light fixture to rotate by the driving device and acquiring a second output value of the absolute encoder, and when the second output value is equal to the corresponding first output value at a certain preset positioning reference point, taking the preset positioning reference point as a calibrated positioning reference point; and S3. positioning the light fixture according to the calibrated positioning reference point. According to the present invention, the light fixture does not need to rotate in a certain direction to a limit position to be stopped by colliding to find an initial position, which thus makes positioning fast, and avoids large noise due to colliding, thereby improving the experience of use.