Portable Test Device for Electrical Machine Fault Detection
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Solution Overview
Problem
Current methods for testing stator core and rotor faults in inverter-fed electrical machines are costly, require disassembly, and lack sensitivity for frequent monitoring, especially for machines rated below several megawatts, as they often rely on specialized equipment and cannot detect local issues effectively.
Innovation Solution
A portable test device that applies an immotive multiphasic test signal to the electrical machine, allowing for in situ fault detection of stator, rotor, and eccentricity without disassembly, using a system that includes a detachable electrical power connectivity, signal generators, and sensors to analyze changes in power and current measurements, enabling frequent monitoring and improved sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If specialized equipment and disassembly methods are used for testing, then measurement precision is improved, but device complexity and ease of operation deteriorate
Solution Approach 1:
The portable test device integrates multiple testing functions (stator core testing, rotor conductivity testing, eccentricity fault testing) into a single unified system. The device can perform different types of electrical machine tests using the same basic hardware platform, eliminating the need for multiple specialized equipment pieces while maintaining comprehensive diagnostic capabilities
Solution Approach 2:
The patent replaces mechanical disassembly requirements with electrical field-based testing methods. By using electromagnetic fields to induce currents and measure responses, the system achieves precise fault detection without physical contact or disassembly of machine components, substituting mechanical testing approaches with field-based measurements
2Measurement precision
If disassembly is required for testing, then measurement precision is improved, but productivity and loss of time worsen
Solution Approach 1:
The portable test device is designed to be connected and configured before the electrical machine is put into operation. By performing tests in advance during setup or maintenance windows without requiring disassembly, the system enables frequent monitoring schedules while maintaining diagnostic accuracy, eliminating the time loss associated with repeated disassembly and reassembly
Solution Approach 2:
The system replaces mechanical disassembly with non-contact electrical field measurements. Sensors and test leads can be connected to external machine terminals without opening the machine housing or disassembling components, allowing rapid testing setup and teardown that supports frequent monitoring while preserving measurement precision
3Measurement precision
If specialized equipment is used, then measurement precision is improved, but ease of operation and loss of time worsen
Solution Approach 1:
The portable test device serves as a universal testing platform that can diagnose multiple fault types (stator core faults, rotor conductivity anomalies, eccentricity issues) using a single instrument. This eliminates the need for operators to manage multiple specialized equipment pieces, simplifying operations while maintaining comprehensive diagnostic precision through integrated measurement capabilities
Solution Approach 2:
The patent extracts the essential testing functions from large, fixed testing systems and consolidates them into a portable device. By taking out only the critical measurement and analysis capabilities needed for fault detection and removing unnecessary bulk or complexity, the system achieves high measurement precision in a portable, easy-to-operate form factor
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 frequent, cost-effective monitoring of stator core and rotor quality without motor disassembly or specialized equipment, improving reliability and efficiency by detecting faults early before they lead to machine failure, thus reducing maintenance costs and extending machine lifespan.
Implementation Method 1
A portable test device that applies an immotive multiphasic test signal to the electrical machine, allowing for in situ fault detection
Data Source
AI summary
A portable test device (1) can be configured as a rotor conductivity anomaly tester, a magnetic core anomaly tester, or a rotational eccentricity fault tester for a multiphasic motive force electrical machine (6) by providing an immotive multiphasic motive force electrical machine test signal from a plurality of multiphasic motive force electrical machine signal generators (4) through a detachable electrical power connectivity (2) and by having a multiphasic motive force electrical machine fault analyzer (16) that can sense responses and discern the existence of a fault. Control of the test signal can be accomplished by an immotive multiphasic test signal controller (3) that varies frequency and achieves incremental movement or to achieve stator magnetization plane angle changes or movement that tests angular relationships.