Transformerless Synchro-Resolver Demodulation for Compact Shaft Angle Sensing
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Solution Overview
Problem
Synchro-demodulators using Scott-T transformers are bulky and heavy, making them unsuitable for applications requiring compact designs.
Innovation Solution
A transformerless method for demodulating synchro-resolver signals by determining the magnitudes of differential signals between secondary windings and using these magnitudes to calculate the shaft angle, eliminating the need for bulky transformers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a Scott-T transformer is used to convert three-phase output signals into quadrature phase sinusoidal signals, then the shaft angle can be determined, but the synchro-demodulator becomes bulky and heavy
Solution Approach 1:
The patent extracts and eliminates the Scott-T transformer from the synchro-demodulator circuitry. Instead of using the transformer to convert three-phase signals to quadrature phase signals, the invention directly processes the three-phase output signals from the synchro-resolver through digital signal processing techniques, removing the bulky transformer component while maintaining the ability to determine shaft angle
Solution Approach 2:
The patent replaces the mechanical/electrical transformer-based signal conversion system with a digital processing system. The three-phase signals are processed using digital algorithms to achieve the same quadrature phase conversion function that the Scott-T transformer provided, but without the physical transformer components
2Measurement precision
If a Scott-T transformer is used to convert three-phase output signals into quadrature phase sinusoidal signals, then the shaft angle can be determined, but the synchro-demodulator becomes bulky
Solution Approach 1:
The patent extracts and eliminates the Scott-T transformer from the synchro-demodulator circuitry. Instead of using the transformer to convert three-phase signals to quadrature phase signals, the invention directly processes the three-phase output signals from the synchro-resolver through digital signal processing techniques, removing the bulky transformer component while maintaining the ability to determine shaft angle
Solution Approach 2:
The patent replaces the mechanical/electrical transformer-based signal conversion system with a digital processing system. The three-phase signals are processed using digital algorithms to achieve the same quadrature phase conversion function that the Scott-T transformer provided, but without the physical transformer components
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables compact and efficient determination of shaft angle without the use of bulky transformers, reducing the size and weight of attitude sensing systems.
Implementation Method 1
The primary winding is excited by an alternating current, which electromagnetically induces voltages in each of the three wye-configured secondary windings
Data Source
AI summary
Apparatus and associated methods relate to a transformer-less way of demodulating signals generated by a synchro-resolver so as to determine a shaft angle of the synchro-resolver. A first differential output voltage between a first pair of the wye-configured secondary windings is used to generate a first output. A second differential output voltage between a second pair of the wye-configured secondary windings, different from the first pair, is used to generate a second output. The first and second outputs are combined to form a signal quadrature to the first output. The first output and the signal quadrature thereto are used to determine the shaft angle.