Relay Armature Position Sensing for Stuck-State Detection
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Solution Overview
Problem
Electromagnetic relays in automated control systems can become stuck in an open or closed position, leading to potential electrical damage due to unintended current flow, as controllers lack real-time feedback on the relay's state.
Innovation Solution
Incorporating built-in position sensors and current sensors within the relay to provide real-time feedback to the controller, ensuring accurate detection of the relay's state and preventing unintended current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If real-time feedback sensors are added to the relay, then reliability is improved, but device complexity increases
Solution Approach 1:
The position sensor is integrated within the housing enclosure of the relay, nesting the sensing component inside the existing relay structure. This allows the sensor to monitor the armature position without requiring external mounting space, thereby improving reliability through real-time feedback while minimizing the increase in device complexity by utilizing the existing structural envelope.
Solution Approach 2:
The housing enclosure serves multiple functions: it provides structural protection for the relay components and simultaneously houses the position sensor. This multi-functionality approach allows the relay structure to accommodate sensing capabilities without proportionally increasing complexity, as the same physical space performs dual roles.
2Reliability
If position sensors are integrated inside the housing enclosure, then reliability is improved through real-time monitoring, but manufacturing complexity increases
Solution Approach 1:
The position sensor is combined with the armature assembly, where the sensor detects the position of the armature through their mutual interaction. This merging of functions allows the sensor to be integrated into the existing assembly process without requiring completely separate manufacturing steps, thereby improving detection accuracy while managing manufacturing complexity through consolidated assembly procedures.
3Measurement precision
If multiple sensors are added to detect relay state, then measurement precision is improved, but device complexity increases
Solution Approach 1:
A non-contact gap is introduced between the armature and the position sensor, serving as an intermediary space that enables magnetic field interaction without physical contact. This gap allows the sensor to detect armature position through magnetic coupling, improving measurement precision while avoiding the complexity of direct mechanical contact sensors or multiple sensing points.
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
Enhances the reliability of relays by minimizing board space requirements and preventing hot switching, making them suitable for safety-critical applications.
Implementation Method 1
a solenoid that is disposed inside the housing enclosure and arranged to actuate the armature between the disengaged position and the engaged position
Implementation Method 2
a position sensor that is disposed inside the housing enclosure, the position sensor being arranged to monitor a position of the armature
Implementation Method 3
a first permanent magnet disposed inside the chassis... a solenoid that is arranged to move the armature between the engaged position and the disengaged position by causing the first permanent magnet to pivot
Implementation Method 4
a voltage sensor that is disposed inside the housing enclosure and coupled between first dielectric barrier and the second dielectric barrier, the voltage sensor being arranged to monitor a voltage across the first dielectric barrier and the second dielectric barrier
Data Source
AI summary
A relay, comprising: a housing enclosure; a first terminal; a second terminal; an armature arranged to assume one of an engaged and disengaged position, such that when the armature is in the engaged position the first terminal is electrically coupled to the second terminal by the armature, and when the armature is in the disengaged position, the first terminal is electrically isolated from the second terminal as a result of the armature being removed from at least one of the first terminal and/or the second terminal; a solenoid that is disposed inside the housing enclosure and arranged to actuate the armature between the disengaged position and the engaged position; and a position sensor that is disposed inside the housing enclosure, the position sensor being arranged to monitor a position of the armature and output an indication of whether the armature is in the disengaged position or the engaged position.