Bus Bar Position Restrictor for Electromagnetic Relay
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing method of improving contact reliability in contact devices by connecting a bus bar to fixed contactors results in deformation of the bus bar due to electromagnetic repulsive force, reducing the contact pressure and reliability.
Innovation Solution
A connection unit with a bus bar position restrictor is introduced, which maintains the bus bar's position on the installation surface, preventing deformation and enhancing contact reliability by reducing electromagnetic repulsive force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bus bar is connected to fixed contactors to improve contact reliability, then contact pressure increases due to electromagnetic repulsive force, but the bus bar deforms away from the storage case top plate, reducing the effectiveness of the repulsive force
Solution Approach 1:
The storage case top plate is pre-formed with a recess that anticipates and counteracts the electromagnetic repulsive force acting on the bus bar. The recess provides a counteracting structural feature that prevents the bus bar from deforming away from its optimal position, thereby maintaining contact pressure and reliability despite the repulsive force
Solution Approach 2:
The solution moves from considering only the horizontal arrangement of the bus bar to incorporating a vertical dimension through the recess. The recess creates a three-dimensional structural relationship where the bus bar can be positioned within the recess depth, allowing the top plate to exert a counteracting force in the vertical direction to balance the electromagnetic repulsion
2Force
If the bus bar is allowed to extend freely to increase contact pressure, then the bus bar deforms in the direction away from the top surface, reducing the electromagnetic repulsive force effectiveness
Solution Approach 1:
The recess in the top plate is designed in advance to counteract the electromagnetic repulsive force. By providing this pre-formed structural feature, the system anticipates the force direction and magnitude, allowing the bus bar to maintain its position and exert effective contact pressure without deforming away from the top surface
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 bus bar position restrictor effectively suppresses bus bar deformation, thereby improving contact reliability by maintaining the bus bar's linear extension along the installation surface, reducing electromagnetic repulsive force, and enhancing the connection unit's performance.
Implementation Method 1
current flowing through the movable contactor and current flowing through the bus bar are in opposite directions, the movable contactor is pressed toward each contact portion by electromagnetic repulsive force generated due to the current flowing through the movable contactor and the bus bar
Data Source
AI summary
A connection unit includes: an electromagnetic relay having a housing, a first fixed contact side terminal, a second fixed contact side terminal, and a movable touch piece; a first bus bar extending on an outside of the housing along a bus bar installation surface in an arrangement direction, and whose one end in the arrangement direction is connected to the first fixed contact side terminal; a second bus bar connected to the second fixed contact side terminal on the outside of the housing; and a bus bar position restrictor arranged on the bus bar installation surface with a gap in the arrangement direction from a connection point, and configured to restrict a position of the first bus bar in a contact/separation direction and in a direction away from the bus bar installation surface.