Resolver R/D Conversion With Feedback Filtering of Vibration Error
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Solution Overview
Problem
Existing R/D conversion technologies face vibration errors and inability to adapt to different resolver systems, particularly in two-phase excitation/two-phase output, one-phase excitation/two-phase output, and two-phase excitation/one-phase output types.
Innovation Solution
An R/D conversion method and converter that removes the frequency band twice the excitation frequency from digital angle values and incorporates a feedback system to suppress vibration errors, allowing conversion across various resolver types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If R/D conversion is performed using existing technologies under signal open phase state or with vibration components present, then the digital angle can be output continuously, but vibration errors occur in the digital angle output
Solution Approach 1:
The patent extracts and removes the harmful frequency component (twice the excitation frequency) from the digital angle signal using a band-stop filter. This separation allows the useful angle information to be preserved while eliminating the vibration error component that causes measurement inaccuracy.
Solution Approach 2:
The patent implements a feedback mechanism where the digital angle value is fed back to adjust the excitation signal phase. This closed-loop control compensates for vibration errors by continuously correcting the excitation signal based on the detected angle, thereby improving measurement precision while maintaining continuous output capability.
2Adaptability or versatility
If existing R/D conversion systems are used, then conversion can be performed for specific resolver types, but the systems cannot adapt to different resolver systems
Solution Approach 1:
The patent designs the R/D conversion system with universal adaptability to handle multiple resolver types (two-phase excitation/two-phase output, one-phase excitation/two-phase output, and two-phase excitation/one-phase output). The system uses a standardized processing approach with configurable parameters that can accommodate different resolver configurations without requiring separate dedicated systems for each type.
Solution Approach 2:
The patent enables adaptation to different resolver systems by changing operational parameters such as excitation frequency, phase differences, and filter characteristics. The system can adjust these parameters based on the specific resolver type being used, allowing a single system design to serve multiple applications without increasing structural complexity.
3Measurement precision
If the frequency component twice the excitation frequency is not removed, then the digital angle value contains vibration errors, but removing it requires additional filtering steps
Solution Approach 1:
The patent introduces a band-stop filter as an intermediary component specifically designed to remove the frequency component at twice the excitation frequency. This targeted filtering approach efficiently eliminates vibration errors without requiring complex multi-stage filtering, as the filter is positioned strategically in the signal processing chain where it can remove the harmful frequency component with minimal impact on the useful signal.
Data Source
AI summary
An R/D conversion method includes a step of removing a frequency band including a frequency component that is twice an excitation frequency of excitation signals of a resolver (30) from a digital angle value (φ). The R/D conversion method further includes a step of outputting, by the resolver (30), the resolver signals having a phase difference that corresponds to an angle of the resolver with respect to the excitation signals, respectively, and a step of feeding back the digital angle value (φ) includes feeding back the digital angle value (φ) to the resolver signals.