Rotation Angle Positioning Device Error Correction
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Solution Overview
Problem
Conventional rotation angle positioning devices for machine tools face challenges in correcting tooth-to-tooth period errors due to a large number of required correction points, which hinders processing efficiency and requires excessive memory capacity.
Innovation Solution
A rotation angle positioning device that utilizes a tooth-to-tooth period error pattern to correct the command value for rotation angle, reducing the number of error correction points and memory required, by employing an error pattern storage unit and a command value correction unit to absorb detection sensor errors across all tooth-to-tooth periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If correction points are increased to reduce the interval between them for accurate tooth-to-tooth period error correction, then measurement precision improves, but device complexity and processing burden increase significantly
Solution Approach 1:
The patent segments the error correction task into two distinct components: rotation period error correction and tooth-to-tooth period error correction. By separating these correction functions, the system can apply different correction strategies to each, avoiding the need for excessive correction points while maintaining high precision for both error types
Solution Approach 2:
The patent performs preliminary correction of rotation period errors before addressing tooth-to-tooth period errors. This preliminary action removes a significant portion of the detection errors, allowing subsequent tooth-to-tooth period error correction to be performed with fewer correction points and reduced computational complexity
2Manufacturing precision
If the number of correction points is increased to cover all tooth-to-tooth periods, then manufacturing precision of error correction improves, but loss of time and processing efficiency deteriorate
Solution Approach 1:
The patent divides error correction into separate rotation period error correction and tooth-to-tooth period error correction processes. This segmentation allows each correction type to be optimized independently, reducing total processing time while maintaining precision
Solution Approach 2:
The system performs rotation period error correction as a preliminary step before tooth-to-tooth period error correction. This preliminary correction eliminates a large portion of detection errors, enabling the subsequent fine correction to be performed quickly with minimal processing time
3Measurement precision
If correction points are increased to accurately capture tooth-to-tooth period errors, then measurement precision improves, but memory capacity requirements increase
Solution Approach 1:
The patent separates correction data into two distinct memory structures: one for rotation period error correction and another for tooth-to-tooth period error correction. This segmentation reduces the total memory capacity required compared to storing correction data for every possible tooth-to-tooth period position
Solution Approach 2:
The system performs preliminary correction using rotation period error data stored in memory, which reduces the precision requirements and memory needs for subsequent tooth-to-tooth period error correction tables
Data Source
AI summary
In a rotation angle positioning device 6 including: a rotation angle detection device 7 which has a detection target ring 8 and an angle detection sensor 9; and a rotating-shaft driving device 10 rotating a rotating shaft so as to cause a rotation angle to become a given command value α for rotation angle, there are provided: an error pattern storage unit 11a storing a tooth-to-tooth period error pattern F made up of errors between detected rotation angles by the angle detection sensor 9 and actual rotation angles, corresponding to respective correction dividing points of an arbitrary tooth-to-tooth period in the detection target ring 8; and a command value correction unit 11b correcting the command value α for rotation angle based on the tooth-to-tooth period error pattern F to find a corrected command value α2 for rotation angle.