Contactor Auxiliary Contact Linkage for Accurate Main Circuit Indication
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Solution Overview
Problem
Existing contactor auxiliary contact systems rely on complex and costly auxiliary switches, which increase manufacturing costs and may fail to accurately indicate the main circuit's working state due to interference.
Innovation Solution
An auxiliary contact system with a rotatable rotation member that controls both the main and auxiliary contacts, eliminating the need for additional switches by using elastic deformation to establish and break contact, thereby reducing costs and enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If auxiliary switches are used for auxiliary contacts, then the contactor structure is complete and functional, but the manufacturing cost increases and the structure becomes complex
Solution Approach 1:
The patent combines the auxiliary contact function with the existing main contact rotation member. The auxiliary movable contact is integrated onto the rotation member, and the auxiliary static contact is integrated onto the contactor body, eliminating the need for separate auxiliary switches and reducing overall system complexity.
Solution Approach 2:
The rotation member serves multiple functions: it controls both the main movable contact and the auxiliary movable contact. By making the rotation member universal for both main and auxiliary circuit control, the patent eliminates the need for dedicated auxiliary switches while maintaining reliable auxiliary contact functionality.
2Reliability
If auxiliary switches are used for auxiliary contacts, then the contactor is functional, but the manufacturing cost increases
Solution Approach 1:
The patent merges the auxiliary contact components with the existing main contact structure. The auxiliary movable contact is integrated onto the rotation member and the auxiliary static contact is integrated onto the contactor body, reducing component count and manufacturing cost.
Solution Approach 2:
The patent creates a simplified copy of the main contact structure for the auxiliary contact function. Instead of using complex auxiliary switches, it uses a scaled-down version of the main contact mechanism with movable and static contacts that follow the rotation member's position.
3Loss of information
If auxiliary switches are used, then the contactor can indicate main circuit state, but the system becomes more complex and costly
Solution Approach 1:
The auxiliary contact system provides feedback about the main circuit state through the auxiliary movable and static contacts. When the main circuit is closed, the auxiliary contacts close; when the main circuit opens, the auxiliary contacts open, providing accurate state indication without additional complexity.
Solution Approach 2:
The rotation member universally controls both main and auxiliary contacts, allowing a single component to perform multiple functions: main circuit control and auxiliary circuit state indication, eliminating the need for separate auxiliary switches.
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 reduces manufacturing costs and improves the system's anti-interference ability, ensuring accurate monitoring of the main circuit's state and providing an alarm in abnormal conditions without requiring additional auxiliary switches.
Implementation Method 1
the rotation member pushes the auxiliary movable contact to the electric separation position separated from the auxiliary static contact
Data Source
AI summary
An auxiliary contact system of a contactor includes an auxiliary movable contact, an auxiliary static contact corresponding to the auxiliary movable contact, and a rotation member configured to be rotatable between a first position and a second position. In the first position, a main movable contact of the contactor is driven by the rotation member to an electric contact position in which the main movable contact contacts a main static contact and the auxiliary movable contact is in the electric contact position contacting the auxiliary static contact. In the second position, the main movable contact of the contactor is driven by the rotation member to an electric separation position where the main movable contact is separated from the main static contact and the rotation member pushes the auxiliary movable contact to the electric separation position separated from the auxiliary static contact.