Signal Level Adjustment for Motor Phase Detection Errors
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Solution Overview
Problem
Existing motor drive controllers face errors in rotation phase detection due to installation phase errors and magnetization variability, which affect the accuracy of phase detection.
Innovation Solution
A signal level adjustment apparatus that detects peak and bottom levels of sinusoidal sensor signals and adjusts signal levels to reduce phase errors by calculating an offset amount and performing in-phase level adjustments, thereby improving detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensor signals are used to detect rotation phase, then rotation position detection is enabled, but phase detection accuracy deteriorates due to installation phase errors and magnetization variability
Solution Approach 1:
The patent applies parameter changes by adjusting the signal levels of sensor outputs through level adjustment units. Each sensor signal undergoes individual level adjustment based on detected peak and bottom levels, transforming the signal parameters to eliminate phase errors caused by installation variations and magnetization dispersion, thereby improving phase detection accuracy
Solution Approach 2:
The patent implements feedback mechanisms by detecting peak and bottom levels of sensor signals and using this information to adjust signal levels dynamically. The level adjustment units receive feedback from the detected signal characteristics and automatically compensate for phase errors, creating a closed-loop system that improves detection reliability
2Measurement precision
If signal level adjustment is performed using peak and bottom levels, then phase error is reduced, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the signal processing into distinct functional units: detection units for each sensor that independently detect peak and bottom levels, and separate level adjustment units for each sensor signal. This modular segmentation simplifies the overall complexity by making each unit's function clear and independent while collectively achieving phase error reduction
Data Source
AI summary
A signal level adjustment apparatus includes a detector configured to detect both a plurality of peak levels of an input signal having a sinusoidal waveform or a substantially sinusoidal waveform and a plurality of bottom levels of the input signal; and a level adjuster configured to adjust, in a predetermined zone of the input signal, levels of the input signal based on the plurality of peak levels and the plurality of bottom levels detected by the detector.