Magnet Array Switch Assembly for Defeat Magnet Resistance
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Solution Overview
Problem
Existing magnetic switch assemblies in alarm systems are vulnerable to tampering by strong external defeat magnets, which can hold the switch in a certain position and prevent it from switching the state of the alarm circuit.
Innovation Solution
The magnetic switch apparatus incorporates a magnetic actuator with multiple magnets arranged in a Halbach array or other configurations that create a strong magnetic field, combined with a switch assembly and biasing devices, to prevent defeat magnets from altering the switch state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnetic switch assembly is used in an alarm system, then the alarm system can detect unauthorized opening of doors or windows, but the magnetic switch assembly is vulnerable to tampering by strong external defeat magnets that can hold the switch in a certain position and prevent it from switching the state of the alarm circuit
Solution Approach 1:
The patent applies preliminary anti-action by pre-configuring the magnetic actuator with a strong magnetic field (through multiple magnets in Halbach array or other configurations) that creates a magnetic bias opposing the action of defeat magnets. This preliminary magnetic field establishes a magnetic equilibrium that resists external magnetic interference before tampering occurs, making it difficult for defeat magnets to hold the switch in a fixed position and prevent state switching.
2Force
If a strong external defeat magnet is placed in proximity to a magnetic switch, then the defeat magnet can hold the switch in a certain position, but this prevents the switch from switching the state of the alarm circuit
Solution Approach 1:
The patent applies parameter changes by modifying the magnetic field parameters through the use of multiple magnets arranged in specific configurations (Halbach array, staggered positions, or defined recesses). This creates a strengthened and distributed magnetic field with increased coercivity, raising the magnetic threshold required to hold the switch in a fixed position. The enhanced magnetic field parameters ensure that normal operational forces can still switch the state while resisting external defeat magnets.
3Object-affected harmful factors
If multiple magnets are arranged in a Halbach array or other configurations to create a strong magnetic field, then the security of magnetic switch assemblies is enhanced and resistance to tampering is improved, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the magnetic actuator into multiple individual magnets rather than using a single large magnet. These segmented magnets are arranged in specific configurations (Halbach array, staggered positions, or defined recesses) to create a distributed magnetic field. This segmentation allows for optimized magnetic field distribution that enhances security and tampering resistance while maintaining a manageable structural complexity through modular arrangement.
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 solution effectively enhances the security of magnetic switch assemblies by creating a robust magnetic field that resists tampering, ensuring reliable operation of the alarm system.
Implementation Method 1
The magnetic actuator includes three or more magnets forming a Halbach array
Implementation Method 2
The magnetic actuator includes three or more magnets forming a Halbach array
Implementation Method 3
The magnetic switch apparatus detects relative movement between a first member and a second member
Data Source
AI summary
A magnetic switch apparatus for detecting relative movement between first and second members includes a switch assembly and a magnetic actuator. The switch assembly is mounted on the first member and is configured to shift between a first state and a second state. The magnetic actuator is mounted on the second member and is configured to shift the switch assembly between the first state and the second state when the first member and the second member are in the open position. The magnetic actuator includes a first magnet, a second magnet, and a third magnet. The first magnet has a first magnetic polarity orientation, the second magnet has a second magnetic polarity orientation, and the third magnet is located between the first and second magnets and has a third magnetic polarity orientation that is different than the first and second magnetic polarity orientations.