Electrical Contactor Health Monitoring for Variable-Current Life Estimation
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Solution Overview
Problem
Electrical contactors in electric work vehicles and other apparatus have a finite lifespan that depends on current and voltage, making it challenging to accurately predict their remaining lifetime when current varies during operation.
Innovation Solution
A method and device for monitoring contactor health by determining the current value during switching events and attributing a percentage of the total contactor life estimate to each event, allowing for an updated remaining life estimate to be calculated and output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If contactor lifetime is estimated based on fixed current data, then the estimation is simple, but the accuracy deteriorates when current varies during operation
Solution Approach 1:
The system continuously monitors actual current values during switching events and uses this feedback to dynamically update the remaining lifetime estimate. The monitoring module detects real-time current, and the processor adjusts the lifetime prediction based on the difference between actual and reference current values, creating a closed-loop feedback system that improves accuracy without requiring complex hardware modifications.
Solution Approach 2:
The system changes the parameter used for lifetime estimation from a fixed reference current to a variable actual current that reflects real operating conditions. By adjusting the current parameter dynamically based on measured values and applying correction factors, the system adapts the lifetime estimation to varying operational conditions while maintaining a relatively simple monitoring architecture.
2Productivity
If contactor is opened at higher current, then the switching capability is maintained, but the lifespan decreases
Solution Approach 1:
The system performs preliminary monitoring of current values before switching events occur and predicts the impact on contactor lifespan in advance. By detecting the actual current value prior to switching and comparing it with reference values, the system can estimate the lifetime reduction beforehand, allowing for proactive maintenance planning without restricting the contactor's switching capability.
Solution Approach 2:
The contactor system performs self-monitoring of its own operating conditions and self-assessment of its remaining lifespan. The monitoring module continuously tracks current values, and the processor automatically calculates lifetime estimates based on actual usage patterns, enabling the system to self-diagnose its health status without external intervention while maintaining full operational capability.
Data Source
AI summary
A method of monitoring contactor health for an electrical contactor of an electric apparatus, the electrical contactor being switchable in a switching event between an open state and a closed state or between a closed state and an open state. In response to a switching event instruction the method comprises determining a current value indicative of current flowing in the electrical contactor in the closed state at a time proximate to the switching event; attributing a percentage of a total contactor life estimate to the switching event based on the current value; determining an updated remaining percentage contactor life estimate by subtracting the percentage of total contactor life estimate from an initial remaining percentage contactor life estimate; and outputting the updated remaining percentage contactor life estimate.