Contactor Coil Current Diagnosis via Temperature Compensation
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Solution Overview
Problem
Conventional methods for diagnosing contactor life are inaccurate due to variations in current flowing through the contactor coil, which depend on real-time voltage and temperature, leading to potential misdiagnosis of contactor lifespan.
Innovation Solution
A system and method that measure the contactor coil's resistance, voltage, and current based on real-time temperature, calculating the current value using the equation I=V/R, and storing average current values over predetermined operation times to determine if the contactor's life has expired by comparing these values to a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional diagnostic methods are used that do not account for real-time temperature and voltage variations, then the diagnostic system is simple, but the measurement precision of contactor current is poor leading to misdiagnosis
Solution Approach 1:
The patent applies parameter changes by measuring temperature and voltage variations in real-time and using these parameters to calculate resistance changes. The system adjusts the current measurement based on temperature-dependent resistance variations, thereby improving measurement precision without requiring a completely complex new system architecture
Solution Approach 2:
The patent replaces direct mechanical current measurement with an electrical calculation approach. Instead of using complex current sensors, the system calculates current by measuring voltage and resistance (where resistance is derived from temperature measurements), substituting a simpler electrical measurement system for what would otherwise require more complex current sensing hardware
2Measurement precision
If real-time temperature and voltage measurements are taken to calculate current, then the measurement precision improves, but the device complexity increases due to additional sensors and calculations
Solution Approach 1:
The patent introduces temperature and voltage measurements as intermediary parameters. Instead of directly measuring current with complex equipment, the system uses temperature and voltage as intermediaries to calculate resistance and then current, simplifying the overall measurement approach while maintaining precision
Solution Approach 2:
The system uses the contactor coil's own temperature and voltage characteristics to diagnose its own current state. By leveraging the inherent temperature-dependent resistance property of the coil, the system performs self-diagnosis without requiring external complex measurement equipment
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 malfunction by confirming current values and determining if the average current exceeds a threshold, thereby providing reliable life expectancy diagnosis.
Implementation Method 1
confirming a real-time resistance value, a real-time voltage value, and a real-time current value for the contactor coil based on a temperature measurement value measured through the temperature measurement unit
Implementation Method 2
calculating the current value using the equation I=V/R
Data Source
AI summary
A system and a method for diagnosing a contactor life using contactor coil current, whereby, after a current value of a current contactor coil is determined based on a resistance value and a voltage value according to a real-time temperature of a contactor coil, whether contactor lifetime has expired and an abnormal operation thus occurs can be previously diagnosed and predicted on the basis of whether an average current value when a corresponding contactor operates a preset number of times or more exceeds a threshold value.