Resolver Signal Peak Validation Using Multi-Threshold Detection
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Solution Overview
Problem
Resolver sensors face challenges in accurately determining the time point of a signal peak, leading to incorrect rotor position measurement and imprecise motor control due to signal delay, especially when using single threshold detection methods.
Innovation Solution
A method and apparatus that input an excitation signal to a resolver sensor, identify high and low peaks, and determine a valid peak by checking if either peak falls within a specific effective range, using multiple threshold values to calculate median values and validate peaks, thereby enabling precise motor control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single threshold detection method is used to identify signal peaks, then the detection process is simple, but the accuracy of identifying the time point of signal peak deteriorates
Solution Approach 1:
The patent segments the signal detection process into multiple stages: first detecting a preliminary peak using a single threshold, then verifying it through additional checks including a second threshold comparison and有效性 determination based on phase angle ranges. This segmentation allows the system to maintain operational simplicity while improving measurement accuracy through structured verification steps.
2Measurement precision
If multiple threshold values are used to calculate median values for validating peaks, then the accuracy of signal peak identification is improved, but the device complexity increases
Solution Approach 1:
The patent implements preliminary actions by first identifying candidate peaks using a single threshold, then preparing verification data (second threshold comparisons, phase angle calculations) before making the final validity determination. This preliminary structuring of verification steps reduces the apparent complexity during peak identification while maintaining high accuracy through systematic validation.
3Device complexity
If proper compensation is not performed for signal delay, then the control system is simpler, but the precision of rotor position determination deteriorates
Solution Approach 1:
The patent implements feedback by measuring the actual signal delay through peak detection and verification, then using this measured delay information to compensate for position calculation errors. The system continuously monitors signal characteristics, determines delay compensation values, and applies them to maintain accurate rotor position determination despite inherent signal delays in the resolver sensor system.
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 approach allows for accurate identification of signal peaks and delay times, ensuring precise motor control by validating peaks within a defined effective range, improving the accuracy of rotor position measurement.
Implementation Method 1
A resolver sensor refers to a sensor for measuring the angular position of a rotor in a motor
Data Source
AI summary
A method and apparatus for obtaining a valid peak from an output signal of a resolver sensor are provided. The method includes inputting an excitation signal to a resolver sensor, receiving a resolver signal from the resolver sensor, receiving a high peak and a low peak from the received resolver signal, determining whether the high peak or the low peak falls within an effective range, and defining the high peak or the low peak as a valid peak when the high peak or the low peak falls within the effective range.