Vehicle Contactor Handle Mechanism for Arc Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Users often neglect to properly switch off the manual switch when connecting or disconnecting cables, leading to potential electrical arcs that can damage contacts and interfere with the vehicle's electrical wiring system, especially when the contactor is in the closed position and high current passes through.
Innovation Solution
A contactor design with a handle and protection mechanism that prevents the protection from being removed when the handle is in the inoperative position, ensuring the electrical connection is secure and accessible only when the handle is in the operative second position, allowing safe disconnection and preventing electric arcs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the manual switch is accessible and removable when the contactor is in the closed position, then the ease of operation is improved, but the risk of electric arcs and damage to contacts increases
Solution Approach 1:
The patent applies preliminary anti-action by preventing the protective cover from being removed when the contactor is in the closed position. The coupling mechanism between the handle and protective cover ensures that the cover remains attached during high-current operation, preemptively preventing user access to the contacts and eliminating the risk of electric arcs during cable connection/disconnection operations.
2Ease of repair
If the protective cover is always accessible, then the ease of repair is improved, but the safety and protection of contacts is reduced
Solution Approach 1:
The patent applies dynamics by making the accessibility of the protective cover conditional on the operational state of the contactor. The handle-coupling mechanism dynamically links cover removal capability to the switch position: the cover can be removed when the contactor is open (safe state) but becomes locked when the contactor is closed (high-current state), thus adapting access control to operational conditions.
3Ease of operation
If the handle can be removed at all positions, then the ease of operation is improved, but the control over electrical connection safety is reduced
Solution Approach 1:
The patent applies preliminary anti-action by preventing handle removal when the contactor is in the closed position through the coupling mechanism. This ensures that the handle remains attached to maintain control over the electrical connection, while still allowing handle removal when the contactor is open and it is safe to do so.
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 ensures safe operation by preventing electrical arcs and ensuring the electrical connection is secure, protecting the contacts and the electrical system from damage during cable operations.
Implementation Method 1
an electromagnetic control device designed to produce a force that recalls the shaft towards an operative second position against the action of the aforesaid elastic means
Implementation Method 2
the electric coil, which produces an electromagnetic force of return on the shaft bearing the mobile contacts
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A contactor (10) comprising a stationary casing (12, 14, 16), bearing at least two fixed contacts (162), and mechanical switching means designed to interrupt the electrical connection between the fixed contacts (162), wherein the mechanical means are set within the casing (12, 14, 16). The contactor further comprises a handle (24), which is accessible from outside the casing for commanding the mechanical switching means and moveable between an inoperative position and an operative first position, in which the mechanical switching means interrupt the electrical connection between the fixed contacts (162), and wherein the handle (24) has a shape configured to prevent an electric cable (30) from being removed from at least one of the fixed contacts (162b, 162c) when the handle (24) is in the inoperative position.