Contactor Carrier Position Sensing for Predictive Fault Detection
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Solution Overview
Problem
Existing contactor monitoring methods fail to reliably predict impending failures, relying on manufacturer guidelines or detecting existing failures rather than proactive monitoring, leading to costly work stoppages and maintenance inefficiencies.
Innovation Solution
A contactor monitoring system that uses a sensor to track the movement of a contact carrier relative to a housing, determining over-travel time and other performance metrics to detect impending faults, existing faults, and contact weld conditions, allowing for predictive maintenance without external safety relays or auxiliary contacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional monitoring methods (manufacturer guidelines or cycle counting) are used, then device complexity is minimized, but reliability of failure prediction deteriorates
Solution Approach 1:
The patent replaces mechanical monitoring methods (physical cycle counters, manual inspections) with electronic sensing and digital signal processing. Sensors detect contactor operations electronically, and controllers process this data to predict failures, substituting mechanical systems with electronic ones to improve reliability while managing complexity.
Solution Approach 2:
The patent introduces sensors as intermediary devices between the contactor and the monitoring system. These sensors detect contactor operations and transmit information to controllers, which then analyze the data to predict failures. This intermediary approach enables reliable failure prediction without requiring direct complex integration between the contactor and monitoring systems.
2Reliability
If proactive monitoring with sensors is implemented, then reliability of failure prediction improves, but device complexity increases
Solution Approach 1:
The monitoring system is designed to be self-sufficient by integrating sensors directly into the contactor structure and using the contactor's own operational data for self-diagnosis. The system monitors its own health status without requiring external complex equipment, enabling proactive failure prediction while minimizing additional device complexity.
Solution Approach 2:
The sensor and controller components serve multiple functions: detecting contactor operations, counting cycles, monitoring operational conditions, and predicting failures. This multi-functionality reduces the need for separate dedicated components for each monitoring task, thereby improving reliability while controlling overall system complexity.
3Measurement precision
If simple mechanical translation methods are used, then device complexity is minimized, but measurement precision of contact position deteriorates
Solution Approach 1:
The patent replaces simple mechanical position translation methods with electronic sensing. Sensors detect contactor position electronically through fields or signals rather than mechanical linkages, providing higher measurement precision while avoiding the complexity of mechanical position translation mechanisms.
4Measurement precision
If optical devices for arc detection are used, then measurement precision of contact state improves, but device complexity and cost increase
Solution Approach 1:
The patent uses sensors as intermediary devices that detect contactor operations through non-optical means (such as electrical fields, magnetic fields, or mechanical vibrations). These sensors provide accurate contact state detection without requiring complex optical systems, arc emission detection equipment, or associated processing hardware, thereby improving measurement precision while controlling 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
Enables accurate prediction of contactor failures, reducing maintenance costs and optimizing usage by providing real-time wellness metrics for proactive replacement, thus improving operational efficiency and safety.
Implementation Method 1
an electromagnet configured to cause the contact carrier to move relative to the housing between a first position and a second position
Implementation Method 2
a sensor coupled to one of the contact carrier and the housing and configured to detect an intermediate position, in between the first position and the second position, at which the housing and the contact carrier are located at a given moment in time
Data Source
AI summary
A contactor includes: at least one moveable contact mounted on a contact carrier; at least one stationary contact mounted on a housing; an electromagnet arranged to cause the contact carrier to move relative to the housing between a first position and a second position, and thus to cause the at least one moveable contact to travel from a contacts open position to a contacts closed position with respect to the at least one stationary contact; a sensor coupled to one of the contact carrier and the housing and arranged to detect an intermediate position, in between the first position and the second position, at which the housing and the contact carrier are located at a given moment in time as the contact carrier moves relative to the housing between the first position and the second position; and a controller connected to receive the signals from the sensor.