Magnetic Control Switch with Rotatable Magnet Holder
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Solution Overview
Problem
Existing contactless control switches face challenges in discerning distinct switching positions due to insufficient magnetic field detection strength and vulnerability to external magnetic fields and debris, which affects reliability and longevity.
Innovation Solution
A contactless control switch design featuring rotatable magnet holders with positive and negative field magnets, positioned adjacent to Hall effect sensors, ensures consistent magnetic field detection across multiple positions, providing robustness against external influences and debris through a sealed and protected sensor configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing contactless control switch designs are used, then the switch structure is simple, but the magnetic sensors cannot detect the magnetic field with sufficient strength to discern distinct switching positions
Solution Approach 1:
The magnet holder is divided into multiple segments, each containing magnets with specific polarities. This segmentation allows the sensor to detect distinct magnetic field patterns corresponding to different switching positions, thereby improving measurement precision without requiring a single complex magnet arrangement
Solution Approach 2:
Different regions of the magnet holder are equipped with magnets of specific polarities (positive and negative fields) tailored to the detection requirements of the magnetic sensor. This local optimization ensures that the magnetic field strength and distribution are precisely controlled at each detection position, enhancing measurement precision
2Reliability
If existing contactless control switch designs are used, then the switch construction is simple, but the switch is vulnerable to external magnetic fields and debris, affecting reliability and longevity
Solution Approach 1:
A magnet holder structure is introduced as an intermediary component between the external environment and the magnetic sensor. This holder shields the sensor from external magnetic fields and debris while allowing the sensor to detect the magnetic fields generated by the magnets within the holder, thereby improving reliability without direct exposure to harmful factors
Solution Approach 2:
The magnet holder is designed to preemptively counteract the effects of external magnetic fields by containing magnets that generate controlled magnetic fields. This preliminary anti-action ensures that the sensor detects only the intended magnetic field patterns, preventing interference from external sources and improving reliability
3Measurement precision
If the magnetic sensors are exposed to detect magnetic fields, then the switching positions can be detected, but the sensors are vulnerable to blockage from mud or other debris
Solution Approach 1:
The magnet holder serves as a protective intermediary that contains the magnets and shields the magnetic sensor from direct exposure to mud and debris. The sensor detects magnetic fields through the holder structure, maintaining measurement precision while preventing physical blockage and contamination
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 enhances the ability to discern distinct switching positions, improves resistance to external magnetic fields, and increases the switch's reliability and longevity by ensuring a strong and consistent magnetic field is sensed, while maintaining a contactless operation that seals against contaminants.
Implementation Method 1
a contactless control switch that operates by moving a magnet past a fixed magnetic sensor, such as a Hall effect IC or a magnetoresistive sensor
Implementation Method 2
a contactless control switch that operates by moving a magnet past a fixed magnetic sensor, such as a Hall effect IC or a magnetoresistive sensor
Data Source
AI summary
A contactless control switch that is resistant to influence from external magnetic fields is disclosed. The switch includes a switch housing, a button moveably mounted to the housing that has at least one protrusion formed on an underside thereof, a circuit board mounted to the housing and including at least one magnet sensor, and a magnet holder positioned adjacent each respective magnet sensor, the magnet holder housing a positive field magnet and a negative field magnet therein and being rotatably mounted to the housing. A respective protrusion interacts with the magnet holder responsive to an actuation of the button by a user, so as to position one of the positive field magnet and the negative field magnet proximate to its respective sensor and the other of the positive field magnet and the negative field magnet distal to its respective sensor.