Fusible Conductive Material for Bus Bar Intermetallic Bonding
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Solution Overview
Problem
In Motor Control Centers (MCCs), the mechanical bolted connections between power bus bars can loosen over time, requiring frequent checks for torque and temperature control, which is time-consuming and complicated by the difficulty in accessing buried connections, necessitating a solution to maintain connectivity and reduce maintenance.
Innovation Solution
The use of fusible conductive materials, such as nanoparticles of nickel and aluminum, to electrically connect power distribution bus bars through apertures in insulating bus supports, eliminating the need for mechanical fasteners by creating a localized high-temperature heat source to form a strong intermetallic bond, thereby maintaining connectivity without periodic checks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If mechanical bolted connections are used to connect bus bars, then the connection can be easily assembled and disassembled, but the connection can loosen over time requiring periodic maintenance
Solution Approach 1:
The patent replaces the mechanical bolted connection system with a fusion-based connection system. Instead of using bolts and screws that can loosen, the invention uses a fusible conductive material that is ignited to create a localized heat source, melting the bus bar surfaces and forming a strong metallurgical bond. This substitution eliminates the loosening problem inherent in mechanical connections while maintaining ease of assembly through a simplified process requiring only placement of the fusible material and ignition.
Solution Approach 2:
The invention changes the physical state and bonding mechanism of the connection. By transforming the connection from a mechanical friction-based hold to a thermal fusion-based bond, the system achieves superior stability. The fusible conductive material undergoes phase change from solid to liquid and back to solid, creating an intermetallic bond that prevents loosening while maintaining electrical conductivity.
2Reliability
If periodic checks of bolted connections are conducted to prevent loosening and overheating, then connection reliability can be maintained, but system downtime increases
Solution Approach 1:
The fusible conductive connection is designed to be maintenance-free once established. The strong metallurgical bond self-locks the connection, preventing loosening without requiring periodic torque checks. The design inherently eliminates the need for operational maintenance, allowing the system to remain online continuously without scheduled downtime for connection verification.
3Difficulty of detecting and measuring
If access to buried connections is required for maintenance checks, then connection status can be verified, but complexity and time consumption increase
Solution Approach 1:
The invention extracts the maintenance requirement entirely from the system. By eliminating the need for periodic checks through the use of maintenance-free fusible connections, the problem of accessing buried connections becomes irrelevant. The connection type itself removes the need for verification activities, thereby eliminating the time loss associated with accessing and checking buried connections.
4Reliability
If bolted connections are used to ensure strong electrical connection, then connectivity can be maintained, but the system requires more space for hardware elements
Solution Approach 1:
The fusible conductive material is applied as a thin layer or foil between the bus bar surfaces. This thin-film approach replaces the bulky bolts, washers, and other hardware elements required for mechanical connections. The thin fusible material creates a strong electrical bond while occupying minimal space, enabling more compact bus bar designs and reducing the overall footprint of electrical distribution systems.
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 solution provides maintenance-free electrical connections that are less susceptible to separation, reducing the need for bolted connections and allowing for more compact designs, while ensuring reliable power distribution and reducing maintenance efforts.
Implementation Method 1
The fusible conductive material can then be ignited, such as by applying a voltage drop, to produce a localized heat source suitable to electrically join the bus bars together.
Implementation Method 2
the temperature at a bond interface can substantially elevate in temperature, on the order of about 1500° C., nearly instantaneously, in a localized area, which can sufficiently 'wet' the material of the bus bars to produce an intermetallic bond
Data Source
AI summary
A fusible conductive material can be used to electrically connect or join power distribution bus bars that are placed on opposing sides of an electrically insulating bus support. The fusible conductive material can be placed in an opening or hole in the bus support with the bus bars abutting the fusible conductive material on opposing sides. The fusible conductive material can then be ignited, such as by applying a voltage drop, to produce a localized heat source suitable to electrically join the bus bars together. By electrically connecting the bus bars in this manner, the bus bars can better conduct, be less susceptible to separation and require less maintenance with respect to connectivity.