Governor Flyweight Magnet Retention Without Solder Joints
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Solution Overview
Problem
Conventional governor flyweight assemblies for Integrated Drive Generators (IDGs) rely on solder joints using cadmium or gold, which are costly and problematic, and there is a need for improved designs that eliminate these materials while maintaining effective control of fluid flow.
Innovation Solution
A flyweight system with a base and tab configuration that secures a samarium-cobalt permanent magnet without solder, using a bolt for mounting, and features a through-bore and track design that allows for magnetic field control of fluid flow, eliminating the need for cadmium or gold solder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solder joints using cadmium or gold are used to connect the magnet to the base, then the magnetic flyweight can be assembled, but the cost increases and reliability decreases due to problematic solder materials
Solution Approach 1:
The patent extracts and eliminates the solder joint from the assembly process. Instead of using solder to connect the magnet to the base, the invention uses a direct mechanical interference fit where the magnet is pressed into a recess in the base, completely removing the problematic solder material (cadmium or gold) from the system while maintaining a reliable connection.
2Ease of manufacture
If solder materials like cadmium or gold are used for joining, then the magnetic flyweight assembly can be formed, but harmful factors increase due to costly and problematic solder materials
Solution Approach 1:
The patent converts the potential harm of requiring complex joining processes into a benefit by using a simple press-fit mechanical connection. This eliminates the need for soldering operations, removing harmful solder materials and their associated manufacturing complexities, while actually simplifying the assembly process and improving overall system reliability.
3Reliability
If conventional solder joining techniques are used, then the magnet can be connected to the base, but device complexity increases due to soldering processes and materials
Solution Approach 1:
The patent replaces the chemical/thermal joining process (soldering) with a purely mechanical connection method. The magnet is secured through a press-fit interference connection into a recess in the base, eliminating the need for soldering equipment, solder materials, and associated thermal processes, thereby reducing assembly complexity while maintaining connection reliability.
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
The solution provides a robust and cost-effective flyweight system that maintains precise control over fluid flow in IDGs by eliminating the use of costly and problematic solder materials, ensuring reliable operation and reduced maintenance costs.
Implementation Method 1
As the flyweights revolve, a magnetic field from voltage applied to a coil interacts with the alnico magnets to control the swing position of the flyweights
Implementation Method 2
a magnetic field from voltage applied to a coil interacts with the alnico magnets
Implementation Method 3
A tab is mounted to the base, sandwiching the magnet between the base and the tab to retain the magnet in the track
Implementation Method 4
sandwiching the magnet between the base and the tab to retain the magnet
Implementation Method 5
A linear actuated valve can be connected to the linkage for linear change of position of a valve member of the linear actuated valve as a function of swing position of the base
Data Source
AI summary
A flyweight system includes a base defining a through-bore for connection to a flyweight governor. The base defines a track therein. A magnet is seated in the track of the base. A tab is mounted to the base, sandwiching the magnet between the base and the tab to retain the magnet in the track.