Sense Coil for Inductive Rotational-Position Sensing
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Solution Overview
Problem
Existing rotational-position sensing technologies require multiple sensors to generate a dual-slope output signal, which increases complexity and cost, whereas current methods aim to achieve this with fewer sensors.
Innovation Solution
A rotational-position sensor configuration utilizing a pair of sense coils, namely a sine coil and a cosine coil, positioned within a changing magnetic field generated by an oscillator coil, where the target's rotation modulates the induced voltages in these coils, allowing an integrated circuit to generate a dual-slope output signal indicative of rotational position and direction using a single sensor setup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensors are used to generate a dual-slope output signal, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent combines the functionality of multiple sensors into a single rotational-position sensor that incorporates both sine and cosine sense coils. This merging allows the generation of dual-slope output signals using one integrated sensor unit, thereby reducing device complexity while maintaining measurement precision.
Solution Approach 2:
The single rotational-position sensor is designed to perform multiple functions: it generates both sine and cosine signals simultaneously, enables dual-slope output signal generation, and provides comprehensive rotational position detection. This multi-functionality eliminates the need for separate sensors for each function.
2Measurement precision
If multiple sensors are used to generate a dual-slope output signal, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
By merging multiple sensor functions into a single rotational-position sensor with integrated sine and cosine coils, the patent reduces the total number of components that need to be manufactured and assembled. This consolidation directly lowers manufacturing costs while preserving the precision benefits of dual-slope output signal generation.
3Device complexity
If a single sensor is used instead of multiple sensors, then device complexity is reduced, but measurement precision may deteriorate
Solution Approach 1:
The patent employs two sense coils (sine and cosine) arranged in quadrature within the single sensor, utilizing orthogonal spatial dimensions of magnetic field sensing. This dimensional approach enables the generation of dual-slope output signals with high precision rotational position measurement while maintaining a single integrated sensor structure.
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
This configuration effectively generates a dual-slope output signal with a known correlation to rotational position using only one rotational-position sensor, reducing complexity and cost by eliminating the need for multiple sensors while maintaining accuracy.
Implementation Method 1
If a coil of wire is placed in a changing magnetic field, a voltage will be induced at ends of coil of wire
Data Source
AI summary
An apparatus for inductive rotational-position sensing is disclosed. An apparatus may include an electrically conductive material defining a continuous path for electrical current to flow between a first and a second location. The continuous path may include a first path portion, defined as a generally clockwise path for the electrical current to flow around a geometric center of the continuous path, and a second path portion, defined as a generally counter-clockwise path for the electrical current to flow around the geometric center. The continuous path may also include a radial-direction-reversal region at which one of the first path portion or the second path portion changes from being defined as a generally outward path for the electrical current to flow away from the geometric center to being defined as a generally inward path for the electrical current to flow toward the geometric center. Related systems, devices, and methods are also disclosed.