Angle Sensor Correction Apparatus N-1 Order Error Reduction
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Solution Overview
Problem
Existing angle sensors face complexity in reducing Nth-order angle error components due to (N+1)th-order signal error components, leading to complicated correction values and processing when N is large.
Innovation Solution
A correction apparatus for angle sensors that generates simplified first and second correction values by adding specific correction values to the detection signals, reducing the Nth-order angle error component by using correction values with an order of N−1, thereby simplifying the processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If correction values of order N+1 are used to reduce Nth-order angle error components, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent changes the order parameter of correction values from N+1 to N-1, which simplifies the correction processing while maintaining the ability to reduce Nth-order angle error components. This parameter change transforms a complex correction method into a simpler one that achieves the same or better measurement precision.
Solution Approach 2:
The patent extracts and eliminates the unnecessary higher-order correction components (order N+1) that contribute to complexity, retaining only the essential correction values of order N-1 that are sufficient to reduce the Nth-order angle error components. This extraction removes redundant complexity while preserving measurement accuracy.
2Measurement precision
If correction processing is applied to reduce angle error components, then measurement precision is improved, but processing time increases
Solution Approach 1:
By changing the order parameter of correction values from N+1 to N-1, the computational complexity of processing is reduced, which directly decreases the processing time required while maintaining the effectiveness of angle error reduction and preserving measurement precision.
3Measurement precision
If higher-order correction values are used, then angle error reduction effectiveness is improved, but ease of operation deteriorates
Solution Approach 1:
The patent optimizes the order parameter of correction values from N+1 to N-1, which simplifies the correction processing operations while maintaining sufficient effectiveness in reducing angle error components. This makes the system easier to operate without sacrificing measurement accuracy.
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 effectively reduces the Nth-order angle error component with simple processing, even when the detection signals contain (N+1)th-order signal error components, improving accuracy and reducing computational complexity.
Implementation Method 1
The magnetic detection element includes, for example, a spin-valve magnetoresistive (MR) element including a magnetization pinned layer whose magnetization direction is pinned, a free layer whose magnetization direction changes with the direction of the rotating magnetic field
Data Source
AI summary
An angle sensor generates an angle detection value based on a first and a second detection signal. A correction apparatus performs correction processing for generating a first corrected detection signal by adding a first correction value to the first detection signal and generating a second corrected detection signal by adding a second correction value to the second detection signal. When an angle to be detected varies with a period T and if no correction processing is performed, the angle detection value contains an Nth-order angle error component varying with a period of T/N. Each of the first and second detection signals contains an (N+1)th-order signal error component. The order of the first and second correction values is N−1.