Inductive Angular Position Sensor Spatial Frequency Design
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Solution Overview
Problem
Existing inductive angular position sensors face challenges in achieving high angular resolution while maintaining low circuit complexity and cost-effective fabrication, as increased resolution often requires more complex and costly high-resolution circuitry.
Innovation Solution
The proposed solution involves an inductive angular position sensor design with a rotor coil having a first rotational symmetry of a first order and a receiver coil with a second rotational symmetry of a second order, where the second order is less than the first order. This design generates a received signal with a fundamental frequency that is the least common multiple of the first and second orders, allowing for higher resolution without increasing circuit complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-resolution circuitry is used to increase angular measurement resolution, then measurement precision is improved, but device complexity and fabrication cost increase
Solution Approach 1:
The patent replaces complex electronic resolution-enhancement circuitry with a mechanical field-based solution. By using a rotor coil with high rotational symmetry order (e.g., 10th order) and a receiver coil with lower rotational symmetry order (e.g., 2nd order), the system generates a received signal with a fundamental frequency that is the least common multiple of the two orders (e.g., 10th harmonic). This mechanical field interaction approach substitutes for electronic signal processing complexity while achieving high angular measurement resolution.
Solution Approach 2:
The patent changes the rotational symmetry order parameter of the coils to achieve high resolution. Specifically, it uses a rotor coil with a first rotational symmetry of a first order (e.g., 10) and a receiver coil with a second rotational symmetry of a second order (e.g., 2), where the second order is less than the first order. This parameter configuration allows the system to generate high-frequency fundamental signals (e.g., 10th harmonic) that provide high angular measurement resolution without requiring complex circuitry.
2Measurement precision
If high-resolution circuitry is used to increase angular measurement resolution, then measurement precision is improved, but fabrication cost increases
Solution Approach 1:
The patent replaces expensive high-resolution circuitry with a mechanical field-based solution. By using a rotor coil with high rotational symmetry order (e.g., 10th order) and a receiver coil with lower rotational symmetry order (e.g., 2nd order), the system generates a received signal with a fundamental frequency that is the least common multiple of the two orders (e.g., 10th harmonic). This mechanical field interaction approach substitutes for expensive electronic signal processing while achieving high angular measurement resolution, thereby reducing fabrication cost.
Solution Approach 2:
The patent changes the rotational symmetry order parameter of the coils to achieve high resolution at low cost. Specifically, it uses a rotor coil with a first rotational symmetry of a first order (e.g., 10) and a receiver coil with a second rotational symmetry of a second order (e.g., 2), where the second order is less than the first order. This parameter configuration allows the system to generate high-frequency fundamental signals (e.g., 10th harmonic) that provide high angular measurement resolution without requiring costly high-resolution circuitry.
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 design effectively increases the angular measurement resolution while reducing the complexity and cost of the circuitry, achieving a higher resolution than traditional sensors with similar circuit complexity, and providing accurate angular measurements with reduced harmonic distortion.
Implementation Method 1
the rotor coil is configured to receive an excitation signal from the excitation coil through an exciter-to-rotor inductive coupling
Implementation Method 2
the receiver coil is configured to generate a received signal based on a rotor-to-receiver inductive coupling
Data Source
AI summary
A receiver coil of an inductive angular position sensor can have circuit features that become smaller than reasonable for high resolution measurement designs. This is especially true when multiple receiver coils are used, such as in a three-phase configuration, and when each of the multiple receiver coils is in a twisted loop configuration. The disclosed inductive angular position sensor utilizes different spatial frequencies for a rotor coil and the receiver coils. For example, the spatial frequency of the receiver coils may be kept smaller than the rotor coil. In this condition, the fundamental frequency of the angular position sensor is shifted to the least common multiple of the spatial frequencies, making the angular resolution of the inductive angular position sensor high, while the circuit features of the receiver coils are maintained at a reasonable size.