Inductive Sensor Receiving Coil Harmonic Compensation
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Solution Overview
Problem
Existing inductive sensor arrangements for determining the angle of rotation suffer from measurement errors due to harmonic interference, which are difficult to compensate for without complex computational methods or additional hardware, limiting their design flexibility and cost-effectiveness.
Innovation Solution
The introduction of harmonic waves into the loop structure of the receiving coil, designed as a superposition of sinusoidal fundamental waves and harmonic waves, counteracts interfering harmonic waves, allowing for cost-effective analog evaluation and reduced measurement errors without the need for complex harmonic compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex computational harmonic compensation methods are used, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent converts harmful harmonic waves into beneficial ones by intentionally introducing harmonic waves with the same frequency as the interfering harmonics but with opposite polarity. These beneficial harmonic waves are superimposed onto the fundamental wave in the receiving coil's loop structure, causing destructive interference with the harmful harmonics and thereby canceling them out, achieving measurement error compensation without complex computational methods
Solution Approach 2:
The patent changes the geometric parameters of the receiving coil's loop structure by superimposing harmonic waves onto the fundamental sinusoidal wave. This modifies the loop structure's shape and distribution characteristics, enabling it to inherently generate harmonic compensation effects. The loop structure is designed with specific geometric features that correspond to the harmonic wave parameters, transforming the physical structure to achieve the desired electromagnetic field distribution
2Measurement precision
If digital linearization and harmonic compensation are implemented, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent replaces complex digital signal processing systems with an analog electromagnetic field-based compensation approach. Instead of using digital linearization algorithms and harmonic compensation circuits in the evaluation unit, the compensation is achieved through the physical loop structure of the receiving coil that inherently generates the necessary harmonic waves through its geometric design, thereby reducing manufacturing costs while maintaining measurement precision
3Measurement precision
If the design space of coil geometry is constrained by measurement error requirements, then measurement precision is maintained, but adaptability decreases
Solution Approach 1:
The patent enables dynamic optimization of the coil geometry design space by introducing adjustable harmonic wave parameters (amplitude, frequency, phase) that can be independently tuned. This allows the loop structure to be optimized for different application requirements while maintaining measurement precision, as the harmonic content can be adjusted to match specific interference characteristics without being constrained by fixed geometric limitations
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 approach minimizes measurement errors, optimizes design space, and allows for the use of cost-effective evaluation and control units, while maintaining accuracy in rotational and linear movement detection.
Implementation Method 1
A high-frequency current passes through the exciter coil, generating an alternating magnetic field. The generated alternating magnetic field induces eddy currents in the coupling device
Implementation Method 2
The voltage signal induced in the at least one receiving structure can provide information on the electrical angle
Data Source
AI summary
An inductive sensor arrangement for detecting a movement of a movable body includes a movable coupling device coupled to the movable body and a measured-value detection device comprising a circuit carrier with an exciter structure and a receiving structure. The exciter structure is coupled to an oscillator circuit which, during operation, couples a periodic alternating signal into the exciter structure. The movable coupling device is designed to influence an inductive coupling between the exciter structure and the receiving structure. An evaluation and control unit is designed to evaluate signals induced in the receiving structure and to determine a measurement signal for a current position of the movable body. The receiving structure comprises a receiving coil having at least one periodically repeating loop structure, each structure designed as a superposition in the angular direction of a sinusoidal fundamental wave and of at least one harmonic wave of the sinusoidal fundamental wave.