Magnetic Position Sensor Layout for Wear-Free Actuator Detection
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Solution Overview
Problem
Existing positional detection devices wear out over time due to mechanical components, and there is a need for long-life components that fit within a form factor and include error-detection technology for diagnostic functions.
Innovation Solution
A positional detection device incorporating magnetic sensing technology with a tunnel magnetoresistance (TMR) integrated circuit (IC) and magnets on an actuator, which changes magnetic fields to allow current flow through the TMR IC, eliminating moving contacts and using resistors for diagnostic functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical snap switches or tactile switches are used, then the device can detect position, but the components wear out over time
Solution Approach 1:
The patent replaces mechanical snap switches and tactile switches with a magnetic sensing system consisting of a TMR IC and magnets. The actuator with magnets moves relative to the TMR IC, changing the magnetic field to detect position without mechanical contact, thereby eliminating wear and extending component lifespan.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the actuator and the TMR IC. The magnets on the actuator generate a magnetic field that interacts with the TMR IC sensing element, enabling position detection without direct mechanical contact between moving and stationary components.
2Duration of action of stationary object
If magnetic sensing technology is used, then component life is extended, but the device must fit within existing form factors
Solution Approach 1:
The patent uses a localized magnetic field interaction between the magnets on the actuator and the TMR IC sensing element. This localized approach allows the magnetic sensing system to be integrated into compact spaces within existing form factors while maintaining extended component lifespan through contactless operation.
3Reliability
If error-detection technology is added, then diagnostic functions are provided, but device complexity increases
Solution Approach 1:
The patent integrates error-detection technology into the existing magnetic sensing circuit by adding resistors that serve dual purposes: establishing proper biasing for the TMR IC and providing diagnostic functionality. This multi-functional approach enables error detection without significantly increasing overall device complexity.
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 device extends the life of components by avoiding mechanical wear, fits within existing form factors, and provides error-detection capabilities through resistive diagnostics.
Implementation Method 1
a tunnel magnetoresistance (TMR) integrated circuit (IC) on a printed circuit board (PCB) inside of the housing
Implementation Method 2
a pair of magnets disposed on an actuator inside of the housing... a magnetic field around the TMR IC to change
Data Source
AI summary
A positional detection device that includes magnetic sensing technology is provided. The positional detection device can include a housing, a switching device, such as a tunnel magnetoresistance (TMR) integrated circuit (IC) or a reed switch, inside of the housing, and a magnet coupled to an actuator. Activation of the actuator can move the magnet and cause a magnetic field, such as the magnetic field to which the switching device is exposed, to change, and responsive to the change in the magnetic field, the switching device can allow current flow therethrough. The positional detection device can also include one or more resistors coupled to the switching device that can determine the current flow responsive to the switching device being activated and deactivated.