Absolute Encoder Angle Error Correction via Microcomputer Lookup
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Solution Overview
Problem
Absolute encoders face errors in the position of the main spindle due to manufacturing variations and the positional relationship of magnets and magnetic sensors, affecting the accuracy of angle detection.
Innovation Solution
An absolute encoder design that includes a first driving gear, a permanent magnet, an angle sensor to detect rotation angle changes, and a microcomputer unit to output angle position and error information, allowing for correction of spindle position errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If angle detection is performed using a permanent magnet and magnetic sensor in an absolute encoder, then position detection capability is achieved, but manufacturing variations and positional relationships cause angle errors
Solution Approach 1:
The patent applies preliminary action by measuring the angle error at predetermined positions during manufacturing and storing these error values in advance. The microcomputer unit retrieves and applies the appropriate error correction based on the detected angle position, thereby compensating for manufacturing variations before they affect operational accuracy.
Solution Approach 2:
The patent implements feedback by using the detected angle position to select and apply corresponding error correction values. The system continuously monitors the angle position and adjusts the measurement by applying stored error corrections, creating a closed-loop system that compensates for manufacturing inaccuracies.
2Measurement precision
If angle error correction is implemented using a microcomputer unit, then angle detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent reduces complexity by performing all error correction calculations in advance during manufacturing. The microcomputer unit only needs to retrieve pre-calculated error values from storage and apply them to the detected angle position, rather than performing complex real-time calculations.
Solution Approach 2:
The patent uses a simplified approach by creating a lookup table of error values at predetermined positions during manufacturing. The microcomputer unit copies and applies these pre-determined correction values based on the detected angle position, avoiding the need for complex mathematical models or real-time error analysis.
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 solution enables accurate correction of main spindle position errors, improving the reliability and precision of angle detection in absolute encoders.
Implementation Method 1
an angle sensor configured to detect a rotation angle of the first driving gear corresponding to a change in a magnetic flux generated from the permanent magnet
Data Source
AI summary
To correct an error based on a position of a main spindle. An absolute encoder includes a magnet as a permanent magnet provided at a leading end side of a first worm gear part, an angle sensor as an angle sensor configured to detect a rotation angle of the first worm gear part corresponding to a change in a magnetic flux generated from the magnet, a microcomputer configured to output angle position information of a first driving gear in a stopped state, wherein the microcomputer outputs angle error information of the first driving gear corresponding to the angle position information.