Opposite-Wound Sensor Coils for Particle Detection in Lubricating Fluids
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Solution Overview
Problem
Existing particle detection devices in fluid flows, particularly in systems for cooling and lubricating drive units, face challenges in reliably detecting small particles and maintaining long-term accuracy, especially in complex high-installation locations like wind power plants.
Innovation Solution
The device features sensor coils with a smaller radial distance from the fluid flow than field coils, wound in opposite directions to increase sensitivity, allowing for the detection of particles as small as 50 to 100 μm, and includes an adjustment mechanism to compensate for offset signals, ensuring accurate particle detection and fluid flow speed measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor coil is arranged at the same radial distance as the field coils, then the device structure is simple, but the detection sensitivity for small particles is insufficient
Solution Approach 1:
The patent applies local quality by positioning the sensor coil at a different radial distance from the fluid flow than the field coils. Specifically, the sensor coil is arranged closer to the fluid flow to maximize detection sensitivity, while the field coils maintain their original positioning for magnetic field generation. This differentiated spatial arrangement optimizes each component's local function without requiring complete structural redesign.
2Reliability
If two sensor coils are used with different radial distances, then particle detection reliability is improved, but the device complexity increases
Solution Approach 1:
The patent segments the detection function by employing two sensor coils at different radial distances from the fluid flow. This segmentation allows the system to detect particles across different spatial zones, improving reliability through multiple detection points. The field coils remain as a separate segment for magnetic field generation, maintaining functional independence while achieving enhanced detection capability.
Solution Approach 2:
The patent implements dynamics by making the sensor coils adjustable relative to the fluid flow. The sensor coils can be moved radially to optimize their positioning for detecting particles of different sizes and at different stages of wear. This dynamic adjustment capability allows the system to adapt to varying detection requirements without permanent structural modifications.
3Measurement precision
If the sensor coil radial distance is optimized for small particle detection, then detection precision for particles <100 μm is improved, but the overall device complexity increases
Solution Approach 1:
The patent addresses small particle detection by introducing a radial dimension differentiation between sensor coil positioning and field coil positioning. Instead of varying only axial or angular positions, the system exploits the radial distance from the fluid flow as an additional dimensional parameter. This allows the sensor coil to be optimally positioned in the radial direction for maximum sensitivity to small particles, while the field coils maintain their original radial positioning for effective magnetic field generation.
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 enables permanent and reliable detection of particles, allowing for early identification of wear in system components, reducing the risk of operational failures and facilitating timely maintenance by distinguishing between magnetic and conductive particles, and determining the condition of components.
Implementation Method 1
As a result of the excitation of a magnetic field by the field coil, both ferromagnetic and non-ferromagnetic, electrically conductive particles in the fluid flow can be detected with the sensor coil
Implementation Method 2
The field coil or the field coils are designed to generate a magnetic field which at least partially covers the fluid flow
Data Source
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AI summary
The invention relates to an apparatus (1) for detecting particles (2) in a fluid flow (6), in particular an inductive particle counter, wherein the apparatus (1) has at least one field coil (34, 36) for generating a magnetic field, which covers at least sections of the fluid flow (6), and a sensor coil (20, 22) which can be connected to an evaluation device which can be used to detect the presence of a particle (2) in the fluid flow (6) from the signal induced in the sensor coil (20, 22), characterized in that the apparatus (1) has at least one first and one second sensor coil (20, 22), and in that the two sensor coils (20, 22) are wound in opposite directions, and to an associated system for cooling and/or lubricating components of a drive unit.