Transformer Position Sensor Shorted Coil Impedance
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Solution Overview
Problem
Transformer position sensors often exhibit phase shift and low power factors due to increased impedance from longer cores or more coil turns, which are attempted to address but end up adversely impacting power factor.
Innovation Solution
Incorporating an electrically shorted coil that opposes the primary magnetic flux, reducing primary coil impedance and improving power factor without increasing core length or coil turns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the length of the magnetically permeable core is increased, then the phase shift between excitation signal and output signal is reduced, but the impedance of the excitation coil and output coil increases, adversely impacting power factor
Solution Approach 1:
The patent segments the magnetic circuit by introducing a separate magnetically permeable core that divides the magnetic flux paths. This allows the core to be optimized for reducing phase shift independently from the coil windings, which are optimized for maintaining acceptable impedance levels.
Solution Approach 2:
The patent changes the magnetic circuit parameters by introducing a magnetically permeable core with specific permeability characteristics. This alters the magnetic flux distribution and reduces phase shift without requiring changes to the coil winding parameters that would increase impedance.
2Measurement precision
If the number of turns of the excitation coil is increased, then the phase shift between excitation signal and output signal is reduced, but the impedance of the excitation coil increases, adversely impacting power factor
Solution Approach 1:
The patent segments the functional requirements by separating the phase shift correction function (handled by the magnetically permeable core) from the signal generation function (handled by the excitation coil). This allows the coil to maintain optimal turn counts for impedance management while the core addresses phase shift independently.
3Measurement precision
If relatively high permeable material is used, then the phase shift between excitation signal and output signal is reduced, but the impedance of the excitation coil and output coil increases, adversely impacting power factor
Solution Approach 1:
The patent optimizes the magnetic circuit parameters by selecting magnetically permeable core material with specific permeability characteristics. This allows reduction of phase shift through improved magnetic flux guidance while maintaining impedance at acceptable levels through proper material selection and geometric configuration.
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
The solution significantly reduces primary coil impedance and improves power factor, enhancing sensor linearity and allowing for the use of lower permeable materials while maintaining sensor performance.
Implementation Method 1
The primary coil is adapted to receive an excitation signal and is configured, upon receipt of the excitation signal, to generate a primary magnetic flux
Implementation Method 2
The secondary coil is inductively coupled to the primary coil upon electrical excitation of the primary coil
Implementation Method 3
The electrically shorted coil is inductively coupled to receive at least a portion of the primary magnetic flux generated by the primary coil. The electrically shorted coil is configured, upon receipt of at least a portion of the primary magnetic flux, to generate a magnetic flux that opposes the primary magnetic flux
Data Source
AI summary
A transformer position sensor includes a primary coil, a secondary coil, and an electrically shorted coil. The primary coil is adapted to receive an excitation signal and is configured, upon receipt of the excitation signal, to generate a primary magnetic flux. The secondary coil is inductively coupled to the primary coil upon electrical excitation of the primary coil, and includes a plurality of differentially wound coils. The electrically shorted coil is inductively coupled to receive at least a portion of the primary magnetic flux generated by the primary coil. The electrically shorted coil is configured, upon receipt of at least a portion of the primary magnetic flux, to generate a magnetic flux that opposes the primary magnetic flux.