Alternator Fault Detection via Phase Voltage Difference Monitoring
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Solution Overview
Problem
Existing alternator diagnosis methods require multiple alternators to function, limiting their applicability to single-alternator systems and lacking robustness in detecting faults.
Innovation Solution
An arrangement that measures the development over time of the difference between two phase voltages at the rectifier input, using an evaluation unit to determine alternator functionality, allowing remote control of rotor current based on these measurements, and comparing with reference values to detect faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing alternator diagnosis methods are used, then fault detection is possible, but multiple alternators are required which limits applicability to single-alternator systems
Solution Approach 1:
The invention extracts the diagnosis function from a multi-alternator system requirement and implements it within a single alternator by measuring the voltage difference between two phase windings. This eliminates the need for multiple alternators while maintaining fault detection capability.
Solution Approach 2:
The alternator performs self-diagnosis by monitoring its own phase voltage differences. The evaluation unit within the alternator system automatically detects faults in the stator windings or rectifier by analyzing the voltage difference, enabling the system to monitor itself without external diagnostic equipment.
2Reliability
If remote control unit is used to control alternator, then galvanic isolation and robustness are improved, but ability to determine alternator functionality becomes more difficult
Solution Approach 1:
The invention introduces an intermediary measurement - the voltage difference between two phase windings - that can be evaluated remotely to determine alternator functionality. This intermediary signal provides fault information without requiring direct access to internal alternator components, maintaining galvanic isolation while enabling diagnosis.
Solution Approach 2:
The remote evaluation unit performs multiple functions: it controls the alternator output and simultaneously monitors phase voltage differences for fault detection. This multi-functionality maintains system robustness through galvanic isolation while preserving the ability to determine alternator functionality.
3Reliability
If phase voltage difference measurement is implemented, then fault detection reliability is improved, but measurement precision requirements increase
Solution Approach 1:
The invention performs preliminary action by continuously monitoring the phase voltage difference before faults can cause damage. The evaluation unit compares the measured voltage difference against threshold values, enabling early fault detection and preventing progression to more severe failures.
Solution Approach 2:
The invention changes the measurement parameter from individual phase voltages to the difference between two phase voltages. This parameter transformation enhances fault detection reliability because faults in stator windings or rectifier diodes manifest as abnormal voltage differences, making the measurement more sensitive to specific fault conditions.
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 reliable fault detection and protection of alternator components without additional alternators, enhancing system robustness and preventing component damage by controlling rotor current within safe limits.
Implementation Method 1
a rotor which is configured to be connected to a source of mechanic energy for being rotated and which is provided with a winding for being magnetised by an electric current fed therethrough
Implementation Method 2
a stator surrounding the rotor and having at least three stator windings for generation of at least three phase voltages in these windings upon rotation of the magnetised rotor therein
Implementation Method 3
a rectifier with an input connected to the stator windings and configured to convert said phase voltages into a direct voltage on an output of the alternator
Data Source
AI summary
An arrangement for generating electric energy comprises an alternator having a rotor with a winding for being magnetized by an electric current fed therethrough and a stator with at least three stator windings for generation of three phase voltages therein upon rotation of the magnetized rotor in the stator. A rectifier has an input connected to the stator windings. Means is configured to measure the development over time of the difference of two of said phase voltages and an evaluation unit is configured to evaluate the result of this measurement to determine the functionality of the alternator. A control unit located remote to the alternator controls the rotor current.