Rotary Inductive Sensor Dual-Coil Peak Detection
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Solution Overview
Problem
Inductive rotary sensors face challenges in accurately detecting the position and speed of rotating targets due to variations in signal amplitude and misalignment, which affects the reliability of position sensing in automated control systems.
Innovation Solution
A system comprising a processing circuitry that receives signals indicative of a magnetic field flux density, identifies a predetermined peak type occurring once per revolution, and outputs a reference signal to accurately determine the position and speed of a rotating target using a dual-coil configuration with a specific lobe arrangement and rotational offset, ensuring consistent signal generation and alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single receiving coil is used to detect magnetic field flux density, then the device complexity is reduced, but the measurement precision and reliability of position detection deteriorate due to signal amplitude variations and misalignment
Solution Approach 1:
The sensor is divided into multiple receiving coils (first receiving coil and second receiving coil) with different lobe configurations. Each coil detects magnetic flux density independently, and the signals are processed separately to determine position and speed, improving measurement precision while maintaining manageable device complexity
Solution Approach 2:
Different regions of the sensor have different properties - the first receiving coil has a first lobe configuration optimized for certain detection characteristics, while the second receiving coil has a second lobe configuration optimized for other characteristics. This local differentiation allows each coil to contribute differently to the overall measurement accuracy
2Reliability
If signal amplitude variations are present in the detected signal, then the reliability of position sensing deteriorates, but introducing additional processing circuits to compensate would increase device complexity
Solution Approach 1:
The system continuously monitors the detected signal characteristics and uses the reference signal generated from the predetermined peak to feedback-correct the position and speed calculations. This feedback mechanism compensates for signal amplitude variations without requiring complex additional processing circuits
Solution Approach 2:
The system pre-identifies the predetermined peak type that occurs once per revolution and uses it to generate a reference signal before final position determination. This preliminary action establishes a reliable reference point that compensates for subsequent signal variations
3Measurement precision
If misalignment between the sensor and rotating target occurs, then the measurement precision deteriorates, but adding alignment adjustment mechanisms would increase device complexity
Solution Approach 1:
The sensor system automatically compensates for misalignment by using the dual-coil configuration to detect signal characteristics that reveal the alignment state. The processing circuitry self-adjusts by using the reference signal from the predetermined peak to correct position measurements, eliminating the need for external alignment adjustment mechanisms
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 system enhances the accuracy and reliability of position and speed detection by generating consistent reference pulses, allowing for precise mechanical angle calculation and improved alignment detection, even in the presence of minor misalignments or imperfections.
Implementation Method 1
a first receiving coil that is arranged to generate a first signal, the first signal being indicative of a flux density of a magnetic field, the magnetic field being generated by a rotating target
Data Source
AI summary
A system, comprising: a processing circuitry configured to: receive a first signal that is indicative of a flux density of a magnetic field, the magnetic field being generated by a rotating target; identify a level of a predetermined type of peak in the first signal, the predetermined type of peak occurring once during each revolution of the target; and output a reference signal when an instant level of the first signal matches the level of the predetermined type of peak.