Integrated Torsion Spring Contactor for Three-Phase Synchronization
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Solution Overview
Problem
Existing contactors face challenges in achieving balanced three-phase synchronization due to the complexity of installing and positioning torsion springs, leading to asynchrony issues, especially in larger contactors.
Innovation Solution
A contactor design utilizing an integral torsion spring with torsion arms on opposite sides of the movable contact and a rotating arm with a pivot axis, along with a guiding mechanism, simplifies installation and ensures balanced force distribution, reducing asynchrony by providing a stable and reliable movement mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two separate torsion springs are used to bias the movable contact assembly, then the contactor can be reset to the open position, but the installation process becomes complicated and three-phase asynchrony occurs
Solution Approach 1:
The patent combines two separate torsion springs into a single integrated torsion spring assembly. The movable contact assembly includes a single torsion spring that provides biasing force to both sides of the movable contact bracket, eliminating the need for separate springs and their complex positioning. This merging resolves the technical contradiction by maintaining reliable three-phase synchronization while dramatically simplifying the installation process.
2Reliability
If compression springs are arranged centrally or laterally, then the contactor can be reset, but extra width or depth is required
Solution Approach 1:
The patent repositions the torsion spring from a central or lateral arrangement (occupying extra width or depth) to an integrated arrangement within the movable contact assembly itself. The torsion spring is positioned along the length of the movable contact bracket, utilizing the existing structural space rather than requiring additional width or depth. This dimensional reorganization maintains the reset function while minimizing the contactor's overall footprint.
3Manufacturing precision
If torsion springs are installed in coaxial sleeves with blind installing process, then the bracket receives balanced biasing force, but the installation becomes more complicated
Solution Approach 1:
The patent extracts the torsion spring from the complex coaxial sleeve arrangement with blind installing requirements. The simplified torsion spring assembly is directly mounted to the movable contact bracket without requiring coaxial sleeves or blind installation techniques. The spring's legs extend to contact both sides of the bracket, providing balanced biasing force through a straightforward, visible installation process that eliminates the need for complex positioning and alignment.
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 design achieves balanced movement and reduces the complexity of installation, effectively alleviating three-phase asynchrony issues, ensuring reliable and synchronized operation of the contactor.
Implementation Method 1
an elastic element configured for biasing the movable contact toward the open position, wherein the elastic element is an integral component and includes a body portion and elastic force output portions located at both ends of the body portion
Implementation Method 2
uses the current flowing through a coil to generate a magnetic field to close a contact
Data Source
AI summary
A contactor includes: a frame; a stationary contact; a movable contact movable between a closed position and an open position, wherein, in the closed position, the movable contact and the stationary contact are connected such that the contactor is closed, and in the open position, the movable contact and the stationary contact are disconnected such that the contactor is open; and a reset mechanism including a counter force spring, the counter force spring being a torsion spring used to bias the movable contact toward the open position, wherein the torsion spring is an integral component including a body portion having a longitudinal axis, a middle leg extending from the body portion and two torsion arms positioned at two ends of the body portion, and the torsion arms are arranged at two opposite sides of the movable contact. Also provided is an electrical control cabinet including the contactor.