Resolver Phase Extraction Using PI Feedback Under Noisy Signals
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Solution Overview
Problem
Extracting phase information from a resolver output signal is challenging due to noise and complexity, requiring a simple and effective method.
Innovation Solution
A resolver signal processing device with a deviation calculation unit, PI operation unit, and integration operation unit that calculates and converges deviations between signal products of phase A and B based on a reference phase, outputting phase information through proportional integration and integration operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple extraction method is used, then the device complexity is reduced, but the measurement precision of phase information deteriorates due to noise in the resolver output signal
Solution Approach 1:
The patent implements a feedback mechanism where the estimated phase information is continuously refined. The deviation calculation unit computes the difference between the actual resolver output and the expected output based on estimated phase, and this deviation is fed back through PI control to continuously adjust and improve the phase estimation, ensuring high precision even with simple processing
Solution Approach 2:
The patent replaces complex mechanical signal processing methods with mathematical computations. Instead of using complex hardware filters or sophisticated signal conditioning circuits, the invention uses software-based deviation calculation, PI control operations, and integration to achieve precise phase extraction from noisy resolver signals
2Reliability
If complex signal processing is applied to improve measurement precision, then the reliability of phase information improves, but the device complexity increases
Solution Approach 1:
The patent divides the phase extraction process into distinct functional segments: deviation calculation unit for computing signal differences, PI operation unit for proportional-integral control, and integration operation unit for final phase integration. This segmentation allows each unit to perform a specific function reliably while keeping the overall system structure clear and manageable
Solution Approach 2:
The patent introduces intermediate computational steps as mediators between the raw resolver signal and the final phase information. The deviation calculation and PI control operations serve as intermediary processing stages that filter and refine the signal progressively, improving reliability without requiring direct complex processing of the raw signal
Data Source
AI summary
A resolver signal processing device includes a deviation calculation unit, a PI operation unit, and an integration operation unit. The deviation calculation unit calculates a deviation between a first product obtained by multiplying a signal of phase A by a cosine value based on a reference phase θref and a second product obtained by multiplying a signal of phase B by a sine value based on the reference phase θref. The PI operation unit carries out a proportional integration operation which includes a first integration operation and is defined to converge the deviation on zero on the basis of the deviation. The integration operation unit carries out a second integration operation of integrating a value generated from a result of the proportional integration operation and outputs a result of the second integration operation as phase information of the resolver.