Resolver Angle Correction via Time Difference Calculation
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Solution Overview
Problem
Conventional rotation angle correction devices for resolver digital converters require complex calculations, such as frequency analysis, leading to increased circuit complexity if hardware-based or high computational demands if software-based, making them inefficient.
Innovation Solution
A rotation angle correction device calculates the error angle by multiplying the difference between the arrival time and reference time, both measured under constant angular velocity assumptions, to correct the output rotation angle, eliminating the need for frequency analysis and reducing computational requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If frequency analysis is performed to correct rotation angle, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts only the essential information needed for correction (time difference between actual and reference arrival times) while discarding the complex frequency analysis process. By taking out only the necessary temporal parameters and their differences, the system achieves correction functionality with significantly reduced computational complexity.
Solution Approach 2:
The patent replaces the computational/m mathematical frequency analysis system with a simpler temporal measurement and comparison system. Instead of performing spectral analysis, the system measures arrival times directly and computes their difference, substituting a complex analytical process with a simpler measurement-based approach.
2Measurement precision
If frequency analysis is performed to correct rotation angle, then measurement precision is improved, but use of energy increases
Solution Approach 1:
The patent extracts only the essential temporal parameters (arrival times) needed for correction while eliminating the energy-intensive frequency analysis process. By taking out only the necessary time measurements and their simple difference calculation, the system achieves correction precision with minimal computational energy consumption.
3Measurement precision
If complex calculation is performed for rotation angle correction, then measurement precision is improved, but productivity decreases
Solution Approach 1:
The patent extracts only the critical temporal information (arrival time differences) required for correction while removing the computationally intensive frequency analysis. This extraction approach maintains correction precision while dramatically improving calculation speed and overall system productivity.
Data Source
AI summary
A rotation angle correction device corrects a rotation angle of a converter converting a signal from a resolver attached to a motor. An arrival time measurement unit measures an arrival time at which the rotation angle reaches a specified rotation angle from a reference angle in a current cycle. A reference time calculation unit calculates a reference time at which the rotation angle reaches the specified rotation angle from the reference angle assuming that the motor rotates in the current cycle at the same angular velocity as an angular velocity in a previous cycle. A difference calculation unit calculates a difference between the arrival time and the reference time. An error angle calculation unit multiplies the difference between the arrival time and the reference time and the angular velocity in the previous cycle to obtain an error angle. A correction unit corrects the rotation angle based on the error angle.