Inductive Proximity Switch With Compensation Coil Field Tuning
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Solution Overview
Problem
Inductive proximity switches have limited flexibility in influencing alternating magnetic fields, making them prone to interference from surrounding materials and requiring precise positioning, which restricts their application to binary on/off switching and is sensitive to installation circumstances.
Innovation Solution
A separate, independently controllable current source for the compensation coils allows for flexible adjustment of the magnetic field, reducing interference from installation materials and enabling individual adaptation to different environments, with the compensation coils being optionally controlled to adjust amplitude and phase positions independently of the primary coil current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If compensation coils are controlled by a common alternating voltage with the primary coil, then the device structure is simple, but the flexibility in influencing the magnetic field is limited
Solution Approach 1:
The patent segments the control system by providing separate controllable current sources for the primary coil and compensation coils. This allows independent control of each coil's current, enabling flexible magnetic field manipulation while maintaining a modular device structure that doesn't overly increase complexity
Solution Approach 2:
The patent implements dynamic control capabilities by allowing the controllable current sources to adjust amplitude and phase positions independently. This enables the magnetic field to be dynamically adapted to different installation circumstances and interference conditions, transforming a static system into a flexible, adaptive one
2Ease of manufacture
If the proximity switch uses fixed magnetic field configuration, then the device is simpler to manufacture, but it is sensitive to installation circumstances and surrounding materials
Solution Approach 1:
The patent enables parameter changes in the magnetic field configuration through independently controllable current sources that can adjust amplitude and phase. This allows the system to adapt to different installation circumstances and surrounding materials by modifying magnetic field parameters, thereby improving reliability without complicating the basic device structure
Solution Approach 2:
The control unit evaluates the current in the primary coil and uses this information to control the compensation coils, creating a feedback mechanism that automatically compensates for interference from surrounding materials and installation circumstances, enhancing reliability
3Object-affected harmful factors
If compensation coils are independently controllable, then interference from surrounding materials is reduced, but the device complexity increases
Solution Approach 1:
The patent introduces controllable current sources as intermediary components between the power supply and the coils. These intermediaries provide precise control over current amplitude and phase, enabling effective compensation for interference while keeping the overall system architecture manageable and not excessively complex
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 enhances the reliability and adaptability of inductive proximity switches by reducing interference from surrounding materials and allowing for precise control of the magnetic field, improving detection accuracy and reducing false triggers, thus making them more robust and versatile.
Implementation Method 1
a primary coil (2), which generates an alternating magnetic field
Implementation Method 2
a current, which is induced in a reception coil on the basis of electromagnetic impact by a primary coil
Data Source
AI summary
The invention relates to an inductive proximity switch having a primary coil for generating an alternating magnetic field, with an oscillator for driving the primary coil, with a control and evaluation unit, which is operatively connected to the oscillator and is equipped to acquire and evaluate an amplitude and a phase position of a current in the primary coil and for outputting a detection signal depending on the acquired current in the primary coil, with at least one compensation coil for manipulation of 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 controlling the at least one compensation coil.