Magnetic Encoder Sinusoidal Curve Offset Amplitude Phase Correction
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Solution Overview
Problem
Magnetic encoders have limited measurement performance due to factors like magnetic hysteresis and structural constraints, limiting their use in applications requiring high precision and reliability.
Innovation Solution
A method optimizing magnetic encoders by adjusting the offset, amplitude, and phase of sinusoidal curves using corrections such as offset correction, amplitude correction, and phase correction, without structural modifications, to achieve optimal performance defined by zero offsets, equal amplitudes, and a quarter-period phase shift between curves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic encoders are used to avoid sensitivity to pollutants and reduce cost, then reliability and cost are improved, but measurement precision deteriorates due to magnetic hysteresis and inability to achieve fine polar pitch
Solution Approach 1:
The patent applies parameter changes by systematically adjusting offset, amplitude, and phase parameters of the sinusoidal curves through correction steps. This resolves the measurement precision issue while maintaining the reliability benefits of magnetic encoders, allowing high-precision measurements without structural modifications.
2Measurement precision
If structural modifications are made to improve measurement performance, then measurement precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent achieves improved measurement precision through parameter corrections (offset, amplitude, phase) rather than structural modifications. This maintains device simplicity and avoids increasing device complexity while still achieving high measurement accuracy.
Solution Approach 2:
The patent replaces mechanical/structural solutions with electronic/software-based parameter corrections. Instead of modifying the physical encoder structure, the invention uses computational methods to correct measurement errors, thereby avoiding increased device complexity.
3Measurement precision
If offset, amplitude, and phase corrections are applied to optimize sinusoidal curves, then measurement precision is improved, but processing time and computational complexity increase
Solution Approach 1:
The patent performs offset, amplitude, and phase corrections during an initialization phase before actual measurement operations. This preliminary action ensures that subsequent measurements use pre-optimized parameters, improving measurement precision without adding processing time during operational measurements.
Solution Approach 2:
The correction method is integrated into the encoder's own operation, allowing the system to self-optimize its measurement parameters without external intervention. The encoder automatically applies corrections to its sinusoidal curve interpretations, maintaining precision while minimizing additional processing overhead.
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 method improves the performance of magnetic encoders by enabling simple and rapid corrections, enhancing their measurement accuracy and precision without increasing manufacturing costs, thus expanding their applicability to more demanding fields.
Implementation Method 1
a permanent magnet, at least bipolar, is attached to a rotating shaft and generates a magnetic field. This magnetic field varies according to the displacement of the magnet, therefore according to its rotation. The magnetic field is detected by a disc-shaped sensor
Implementation Method 2
for certain magnetoresis encoders, to magnetic hysteresis, i.e. the fact that the curves observed during the increase and decrease of the magnetic field are not perfectly superimposable
Data Source
Figure 1~3
AI summary
The invention relates to a method for a magnetic encoder (1) comprising at least the following steps: - a) assessing the following characteristics: origin or offset, amplitude and relative phase of the sinusoidal curves, representative of the performance of the magnetic encoder (1), by examining the characteristics one by one, - b) determining at least one characteristic to be obtained to achieve a desired performance of the magnetic encoder (1), with determined characteristics, - c) performing at least one correction of a characteristic, choosing the type of correction to be performed from offset adjustment, amplitude correction and phase correction, - d) verifying the characteristics of the magnetic encoder (1) after correction by assessing the characteristics, - e) comparing the characteristics obtained in step d) with the determined characteristics.- f) Repeat steps c) to e) until the determined characteristics are obtained.