Angle Sensor Correction Apparatus Reducing Nth-Order Error
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Solution Overview
Problem
Existing angle sensors face challenges in reducing Nth-order angle error components due to signal error components of mutually different orders, with existing methods becoming complex and inefficient for higher order reductions.
Innovation Solution
A correction apparatus for angle sensors that generates first and second corrected detection signals by adding specific correction values to the detection signals, simplifying the processing to reduce Nth-order angle error components regardless of the order value, using correction values that are determined using uncorrected angle detection values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods are used to reduce Nth-order angle error components, then measurement precision is improved, but device complexity increases significantly
Solution Approach 1:
The patent changes the parameter of correction signal generation by using a single-order correction value (N-1)th order instead of multiple different order correction values. This parameter change simplifies the correction processing while maintaining the ability to reduce Nth-order angle error components, thereby improving measurement precision without significantly increasing device complexity
Solution Approach 2:
The patent creates a universal correction method that can reduce Nth-order angle error components for any integer N≥1 using the same correction processing approach. The correction value generation unit universally applies (N-1)th order correction signals regardless of the specific error order, making the system multi-functional across different error types without requiring separate correction mechanisms for each order
2Measurement precision
If multiple different order correction values are applied to reduce angle error components, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent simplifies the correction processing by changing the parameter from multiple different order correction values to a single (N-1)th order correction value. This parameter change makes the correction processing easier to operate while still achieving reduction of Nth-order angle error components, thus improving measurement precision without compromising ease of operation
3Measurement precision
If conventional correction methods are used for higher order error reduction, then measurement precision is improved, but productivity deteriorates
Solution Approach 1:
The patent improves productivity by changing the correction parameter from multiple complex correction values to a single (N-1)th order correction value. This parameter change reduces the computational burden and processing time required for correction, enabling faster angle detection with high precision, thus improving both measurement precision and productivity simultaneously
Solution Approach 2:
The patent applies partial correction by using only the necessary (N-1)th order correction value instead of applying all possible correction values. This partial action approach achieves sufficient error reduction for Nth-order components without the excessive processing required by conventional methods, thereby improving productivity while maintaining measurement precision
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 Nth-order angle error components with simple processing, improving the accuracy of angle detection values by minimizing the amplitude of error components, regardless of the order value, thus enhancing the precision of angle sensors.
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 and an (N+1)th-order signal error component. The order of the first and second correction values is N−1 or N+1.