Inductive Proximity Switch Compensation Coil Control
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Solution Overview
Problem
Inductive proximity switches have limited flexibility in influencing magnetic fields near the sensor, making them susceptible to interference from surrounding materials and installation conditions, which affects detection accuracy and reliability.
Innovation Solution
A separate, independently controllable power source is used to drive the compensation coils, allowing for flexible adjustment of the alternating magnetic field and reducing interference from nearby materials and installation conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a common AC voltage generator is used to operate both the transmitting coil and compensation coil, then the device structure is simple, but the flexibility in influencing the magnetic field is limited
Solution Approach 1:
The patent divides the power supply system into separate current sources: one for the transmitting coil and independent controllable current sources for each compensation coil. This segmentation allows independent control of each coil's current, enabling flexible adjustment of the magnetic field configuration without being constrained by a common power source.
Solution Approach 2:
The patent implements dynamic control by making the compensation coil current sources independently controllable, allowing real-time adjustment of compensation current magnitude and phase. This dynamic capability enables adaptive optimization of the magnetic field for different installation situations and interference conditions.
2Measurement precision
If compensation coils are used to reduce interference, then detection accuracy improves, but the control complexity increases
Solution Approach 1:
The patent applies local quality by providing independent control for each compensation coil, allowing targeted adjustment of compensation current in specific spatial regions. This enables precise cancellation of interference from particular directions or sources while maintaining detection sensitivity in the desired measurement direction.
Solution Approach 2:
The patent utilizes parameter changes by independently adjusting the current magnitude and phase angle of each compensation coil through separate current sources. This enables flexible optimization of the compensation effect to match varying installation conditions and interference patterns, thereby improving detection accuracy.
3Reliability
If the proximity switch is adapted to different installation situations, then reliability improves, but the adjustment complexity increases
Solution Approach 1:
The patent implements dynamic adaptability through independently controllable current sources for compensation coils, allowing the system to be adjusted for different installation situations such as varying distances from conductive surfaces or different spatial orientations. This dynamic control enables optimization of detection reliability for each specific application.
Solution Approach 2:
The patent enables adaptation to different installation situations by allowing independent adjustment of compensation coil current parameters (magnitude and phase). This flexibility permits optimization of the magnetic field configuration for various mounting conditions, thereby improving detection reliability without requiring hardware changes.
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 solution significantly reduces interference from surrounding materials and allows for individual adjustment of the proximity switch in various installation situations, enhancing detection reliability and accuracy by providing flexible control over the compensation coils.
Implementation Method 1
a primary coil for generating an alternating magnetic field
Implementation Method 2
at least one compensation coil for manipulating the alternating magnetic field generated by the primary coil
Data Source
Figure 1
AI summary
The invention relates to an inductive proximity switch having a primary coil for generating an alternating magnetic field, having an oscillator for driving the primary coil, having a control/evaluation unit which is functionally connected to the oscillator and is set up to capture and evaluate an amplitude and a phase angle of a current in the primary coil and to output a detection signal on the basis of the captured current in the primary coil, and having at least one compensation coil for manipulating the alternating magnetic field generated by the primary coil. The inductive proximity switch is characterized in that a separate controllable current source is present for the purpose of controlling the at least one compensation coil.