Programmable Interpolation Module for Sensor Phase Compensation
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Solution Overview
Problem
Existing encoder systems face challenges in accurately detecting position or speed due to mechanical incompatibilities and misalignments between the sensor array and the target pattern, leading to errors in high-resolution output signals.
Innovation Solution
A programmable interpolator is introduced to compensate for mechanical mismatches by adjusting the phase difference of output signals, using a compensation module that can be linearly proportional to the pole width of the pattern, allowing for a wider range of design dimensions and reducing design complexity through the use of logic circuits or microprocessors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor array length is designed to match the pattern length, then measurement precision is improved, but device complexity increases due to mechanical adjustment requirements
Solution Approach 1:
The patent replaces mechanical adjustment methods (such as twist angle adjustment) with a programmable interpolator that uses software algorithms to compensate for mismatches between sensor array length and pattern length. This substitution eliminates complex mechanical adjustment requirements while maintaining high measurement precision through digital signal processing.
Solution Approach 2:
The patent changes the approach from physical dimension matching to parameter compensation. Instead of ensuring the sensor array length exactly matches the pattern length, the system uses programmable interpolators to adjust and compensate for dimensional mismatches, allowing flexibility in design while maintaining accuracy through parameter adjustment rather than mechanical precision.
2Measurement precision
If mechanical adjustment is used to compensate for mismatches, then measurement precision is improved, but ease of manufacture deteriorates
Solution Approach 1:
The patent replaces mechanical compensation methods with a programmable interpolator that performs phase correction through software algorithms. This eliminates the need for complex mechanical adjustment procedures during assembly, significantly improving ease of manufacture while maintaining phase difference accuracy through digital signal processing.
3Measurement precision
If vector processing circuits are used to adjust signal phase, then measurement precision is improved, but device complexity increases due to computational resources required
Solution Approach 1:
The patent uses programmable interpolators that adjust phase parameters through software algorithms rather than complex vector processing circuits. This approach achieves accurate signal phase correction with reduced computational complexity by using parameter adjustment methods that are more efficient than full vector processing 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 programmable interpolator effectively corrects phase differences, ensuring accurate position and speed detection by accounting for variations in pattern length, pole widths, and pitch, thereby enhancing the accuracy and reliability of encoder systems.
Implementation Method 1
a Hall Effect sensor configured to generate a first output signal and a second output signal based on a periodic pattern of a rotating member
Data Source
AI summary
A sensor system including a movable member, a sensor, and an interpolator. The sensor is configured to generate a first output signal and a second output signal. The first output signal has a first phase angle, the second output signal has a second phase angle, and a first difference between the first phase angle and the second phase angle has a first value. The first value of the first difference includes an offset related to a mechanical incompatibility between the sensor and the movable member. The interpolator is configured to receive the first output signal and the second output signal. The interpolator is operable to apply a compensation factor to generate a third signal having a third phase. The compensation factor has a value that is based on the mechanical incompatibility between the sensor and the movable member.