Cam-Actuated Movable Contact Switch for Fast Stable Switching
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Solution Overview
Problem
Existing electrical switches for AC power grids lack efficient mechanisms to quickly and reliably transition between open and closed states, often requiring more components and not maintaining stability effectively at high currents.
Innovation Solution
A switch design featuring a movable conductive contact, a cam, and an elastic assembly that holds the actuator in stable positions, allowing quick transitions between open and closed states using a cam and elastic members to apply forces, reducing component count and maintaining stability at high currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional switching mechanisms are used, then the switch can operate between open and closed states, but the transition speed is slow and reliability is insufficient at high currents
Solution Approach 1:
The patent employs dynamic elements including a cam mechanism that converts rotational motion into linear actuator movement, and an elastic assembly that provides dynamic restoring force. The actuator transitions between two stable positions through the interaction of the cam profile and elastic member, enabling rapid and reliable state changes in response to rotational input.
Solution Approach 2:
The switching mechanism is segmented into distinct functional components: a cam for motion conversion, an elastic assembly for energy storage and restoring force, an actuator with cam region for interaction, and movable/electrically conductive contacts for current interruption. This segmentation allows each component to be optimized for its specific function, improving overall reliability and transition speed.
2Reliability
If more components are added to improve switching performance, then reliability may improve, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into integrated components. The actuator serves both as a motion transmission element and as a component that directly actuates the electrical contacts. The elastic assembly provides both the restoring force and the snap-action mechanism in a single integrated structure, eliminating the need for separate springs and latch mechanisms.
Solution Approach 2:
The cam mechanism serves multiple functions: it converts rotational motion to linear motion, provides the actuating force for contact separation, and works in conjunction with the elastic assembly to create the snap-action effect. This multi-functionality reduces the need for additional dedicated components, maintaining simplicity while ensuring reliable operation.
3Reliability
If the switch is designed for high current stability, then contact reliability improves, but the mechanism becomes more complex
Solution Approach 1:
The cam profile employs curved geometric surfaces that provide smooth motion transitions and consistent force application during the switching action. The curved cam surface ensures gradual engagement and disengagement of the actuator, maintaining contact stability under high current conditions while avoiding abrupt mechanical shocks that would require additional protective components.
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 enables rapid and reliable switching between open and closed states, maintaining contact stability even at currents exceeding the rated value, with fewer components and enhanced safety and performance.
Implementation Method 1
an elastic assembly coupled to the actuator, the elastic assembly configured to hold the actuator in either of the two stable positions
Implementation Method 2
a cam; and an actuator connected to the electrically conductive moveable contact, the actuator including a cam region configured to interact with the cam. Rotation of the cam moves the actuator between one of two stable positions
Data Source
AI summary
An electrical apparatus includes: a first electrically conductive contact; and a switch. The switch includes: an electrically conductive moveable contact; a cam; an actuator connected to the electrically conductive moveable contact, the actuator including a cam region configured to interact with the cam. Rotation of the cam moves the actuator between one of two stable positions, the two stable positions including a first position and a second position. The switch also includes an elastic assembly coupled to the actuator, the elastic assembly configured to hold the actuator in either of the two stable positions. When the actuator is in the first position, the switch is closed and the electrically conductive moveable contact is connected to the first electrically conductive contact; and, when the actuator is in the second position, the switch is open and the electrically conductive moveable contact is separated from the first electrically conductive contact.