Electromagnetic Switch Moveable Contact Triangular Configuration
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Solution Overview
Problem
Electromagnetic switches in electric vehicles and equipment often generate audible noise and vibration due to resonance and oscillatory instability caused by large-amplitude currents, which affects their performance and reliability.
Innovation Solution
The electromagnetic switch design incorporates a moveable contact with at least three contact points, forming a triangle that encloses the center of force, which reduces noise and instability by providing mechanically stable electrical contact and using non-conducting mechanical contacts and heat sinks to manage thermal and mechanical stresses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a moveable contact is used in electromagnetic switches, then the switch can control opening and closing of electric power lines, but noise and vibration are generated due to resonance and oscillatory instability
Solution Approach 1:
The moveable contact is segmented into multiple contact points (at least three) arranged to form a triangle. This segmentation distributes the contact function across multiple points, preventing concentrated oscillation and resonance at a single point, thereby reducing noise and vibration while maintaining switching capability.
Solution Approach 2:
The contact points are arranged in a two-dimensional triangular configuration rather than a linear or single-point arrangement. This dimensional change creates geometric stability that resists oscillatory motion, eliminating resonance-induced noise and vibration while preserving the switching function.
2Reliability
If the moveable contact makes contact with stationary contacts, then electrical connection is established, but mechanical instability and resonance occur
Solution Approach 1:
The electrical contact is segmented into at least three separate contact points arranged in a triangle. This segmentation provides multiple stable contact zones that distribute mechanical loads and prevent resonant oscillation, simultaneously ensuring reliable electrical connection and mechanical stability.
Solution Approach 2:
The contact points are arranged in a two-dimensional triangular pattern rather than a linear arrangement. This geometric configuration creates inherent mechanical stability through triangular rigidity, preventing oscillatory instability while maintaining consistent electrical contact reliability.
3Power
If large-amplitude currents flow through the switch, then power control capability is achieved, but oscillatory instability and noise are generated
Solution Approach 1:
The current path is segmented through multiple contact points (at least three) arranged in a triangle. This segmentation distributes the electromagnetic forces generated by large-amplitude currents across multiple contact zones, preventing concentrated oscillation and resonance, thereby enabling power control without generating noise or instability.
Solution Approach 2:
The triangular arrangement of contact points in two dimensions creates geometric stability that resists oscillatory forces generated by large currents. This dimensional configuration distributes electromagnetic loading and prevents resonance, allowing high power control capability without oscillatory instability or noise.
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 configuration eliminates or reduces noise and vibration, enhancing the mechanical stability and reliability of the switch by preventing unwanted resonance and maintaining stiffness during reciprocal motion.
Implementation Method 1
electromagnetic switch includes: at least two stationary electric contacts; and a moveable contact, wherein the electromagnetic switch is configured for reciprocal motion of the moveable contact into and out of contact with the stationary electric contacts
Implementation Method 2
The electromagnetic switch further includes a heat sink in thermal contact with the non-conducting mechanical contact
Data Source
AI summary
An electromagnetic switch including a first stationary electric contact, a second stationary electric contact, a mechanical contact, and a moveable contact. The electromagnetic switch is configured for reciprocal motion of the moveable contact into and out of contact with the first stationary electric contact and the second stationary electric contact, wherein the moveable contact remains in contact with the mechanical contact (e.g., a non-conducting contact) throughout the reciprocal motion. In various embodiments, the moveable contact is configured so that at the end of the reciprocal motion three contact points occur, and a triangle defined by the three contact points encloses a center of force of the reciprocal motion.