Rotary Transformer Rotor Position Acquisition via Dual Decoding
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Solution Overview
Problem
Existing methods for acquiring the rotor position of a rotary transformer are prone to failure, leading to inaccurate detection and potential system faults, as they rely on either a rotary transformer decoder or software decoding, which may not guarantee accurate sampling of feedback signals.
Innovation Solution
A system integrating a rotary transformer decoder and software decoding to acquire redundant rotor positions, with a synchronous demodulation module and calculation module comparing the positions to ensure reliability, where one position is used for motor control and the other as backup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rotary transformer decoder or software decoding is used to acquire rotor position, then the acquisition method is simple, but the reliability of the acquired rotor position is low due to potential failure and inaccurate detection
Solution Approach 1:
The patent implements a dual decoding architecture where both hardware decoder and software decoder operate simultaneously to acquire rotor position. The system prepares redundant position information in advance through multiple independent decoding paths, cushioning against potential failures of either single decoder. This ensures high reliability by having backup decoding mechanisms ready before faults occur.
Solution Approach 2:
The patent applies different decoding methods (hardware decoder and software decoder) to different aspects of rotor position acquisition. Each decoder has its own characteristics and error patterns, and the system selectively uses or weights their outputs based on local conditions and reliability assessments, optimizing the overall acquisition quality.
2Reliability
If redundant position acquisition is implemented by integrating hardware decoder and software decoder, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The patent merges hardware decoding and software decoding into a unified rotor position acquisition system. Both decoders work concurrently to produce position information, which is then integrated through comparison and selection logic. This combining approach leverages the strengths of both methods while providing mutual redundancy, improving reliability without requiring completely separate systems.
Solution Approach 2:
The patent creates a software decoder that replicates the functionality of the hardware decoder in software form. This software copy provides an independent verification path and backup mechanism. By having a software counterpart to the hardware decoder, the system can compare results and detect faults, enhancing reliability while using existing computational resources.
Data Source
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AI summary
A method and a system for acquiring a rotor position of a rotary transformer are provided. The system includes: a rotary transformer decoder, a low pass filter and a microprocessor, which includes a synchronous demodulation module and a calculation module. The rotary transformer decoder outputs an excitation signal and acquires first position information of the motor rotor. The calculation module performs calculation to acquire second position information of the motor rotor. The rotary transformer decoder and software decoding are integrated to acquire two rotor positions, and the two rotor positions are compared. In a case that a preset determining condition is met, one of the rotor positions is used for motor control, and the other is used as redundant data for backup, thereby improving the reliability of the acquired rotor position.