Wire EDM Power Switching Circuit for Fault Isolation
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Solution Overview
Problem
In wire electrical discharge machining, when a switching element fails, the increased current through other switching elements can lead to their failure as well, causing machining to cease, as the existing systems do not effectively isolate faulty elements and adjust machining conditions.
Innovation Solution
A wire electrical discharge machine with multiple switching elements connected in parallel and switches in series, where a control device disconnects failed switching elements and adjusts machining conditions based on the number of failures to prevent normal elements from failing, ensuring continuous machining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If switching elements are connected in parallel to supply machining current, then the productivity and reliability are improved, but when a switching element fails, the current through other switching elements increases causing them to fail as well
Solution Approach 1:
The patent divides the switching element system into independently controllable segments by introducing individual switches for each switching element. When one switching element fails, its corresponding switch can isolate that element from the circuit, preventing current redistribution that would overload other elements. This segmentation allows the system to maintain functionality with remaining elements without suffering cascading failures.
Solution Approach 2:
The patent introduces individual switches as intermediary components between the power supply and each switching element. These switches act as mediators that can selectively connect or disconnect each switching element from the circuit. When a failure is detected, the intermediary switch isolates the faulty element, preventing harmful current flow to other elements while allowing continued operation of healthy elements.
2Object-affected harmful factors
If switching elements are separated when one fails, then the harmful effect is reduced, but the current through other switching elements increases causing them to fail
Solution Approach 1:
The patent implements dynamic control of the switching element system by continuously monitoring the state of each switching element and adjusting the configuration in real-time. When a failure is detected, the system dynamically reconfigures by opening the corresponding switch to isolate the faulty element. This dynamic adaptation allows the system to maintain optimal current distribution through remaining elements, preventing overload while ensuring continued operation.
Solution Approach 2:
The patent incorporates feedback mechanisms that monitor the operational state of each switching element and provide information to the control system. This feedback enables the system to detect failures promptly and respond by isolating affected elements through their corresponding switches. The feedback loop ensures that current distribution is continuously optimized to prevent overload on remaining healthy elements, maintaining system reliability.
3Ease of repair
If multiple switches are connected in series with switching elements to separate them, then faulty elements can be isolated, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by providing individual switches for each switching element, creating modular, independently controllable units. While this increases the number of components, it enables precise isolation of faulty elements without affecting others. The segmented architecture simplifies fault diagnosis and repair procedures, as each element can be independently tested and replaced if necessary, offsetting the initial complexity increase with operational simplicity.
Solution Approach 2:
The patent implements self-service functionality through automated monitoring and isolation mechanisms. The control system automatically detects failures and isolates affected elements without requiring manual intervention, reducing the operational burden despite increased component count. The system essentially monitors and maintains itself, compensating for the added complexity through automation that eliminates the need for complex manual repair procedures.
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
This configuration allows continuous machining even when switching elements fail, by disconnecting faulty elements and adjusting conditions to prevent normal elements from overloading, thereby maintaining process integrity.
Implementation Method 1
a plurality of switching elements connected in parallel with each other to supply the machining current to the electrode gap
Implementation Method 2
a plurality of switches each connected in series with one of the switching elements separate the switching elements
Implementation Method 3
supplying, according to machining conditions, machining current from machining power unit to an electrode gap formed between a wire electrode and a workpiece
Data Source
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AI summary
A wire electrical discharge machine (12) includes: a multiple number of switching elements (SWE2) connected in parallel with each other and configured to supply the machining current to the electrode gap (EG) to perform electrical discharge machining; a multiple number of switches (SW) each connected in series with the associated one of the multiple switching elements (SWE2) and configured to cut off each of the multiple switching elements (SWE2); and a control device (16) configured to perform control when at least one of the multiple switching elements (SWE2) fails so as to disconnect the failed switching elements (SWE2) by means of the associated switches (SW) and also change the machining conditions in accordance with the number of the failed switching elements (SWE2).