Electromagnetic Contactor Stepped Cover Visibility
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Solution Overview
Problem
Existing electromagnetic contactors require oblique viewing to confirm the operating state due to the arrangement of the operation indicating piece in the same plane as the arc extinguishing cover, making it difficult to determine the operating state without projecting the movable-contactor support or operation indicating piece from the housing.
Innovation Solution
The electromagnetic contactor features an arc extinguishing cover with a concaved center portion and edge portion, where the operation indicating piece projects from the center portion when the contact is off and embeds within when the contact is on, allowing the operating state to be confirmed from multiple angles without oblique viewing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the operation indicating piece is arranged in the same plane as the arc extinguishing cover, then the movable-contactor support does not project from the housing, but the operating state cannot be confirmed without oblique viewing
Solution Approach 1:
The arc extinguishing cover is designed with a stepped structure having different height levels. The operation indicating piece is positioned to project from the lower surface when the contactor is off, and embed into the cover when on. This vertical dimensionality change allows the indicating piece to be visible from the front without requiring oblique viewing, while the stepped structure contains the projection within the housing envelope.
Solution Approach 2:
The arc extinguishing cover has different surface levels: an upper surface and a lower surface separated by a step. The operation indicating piece interacts with this localized structural difference by projecting from the lower surface in the off state and embedding into the cover in the on state. This local structural variation enables clear visual indication without overall projection from the housing.
2Difficulty of detecting and measuring
If the operation indicating piece projects from the arc extinguishing cover, then the operating state is visible, but the piece must project from the housing
Solution Approach 1:
Instead of horizontal projection from the housing, the indicating piece uses vertical projection from the lower surface of the arc extinguishing cover. The stepped structure of the cover creates a vertical dimension where the piece can project upward when off and embed downward when on, achieving visibility without horizontal projection from the housing envelope.
Solution Approach 2:
The operation indicating piece is nested within the stepped structure of the arc extinguishing cover. When the contactor is on, the piece embeds into the cover's upper surface, becoming hidden. When off, it projects from the lower surface. This nesting relationship allows the piece to be contained within the housing while still providing visible indication.
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
Enables easy confirmation of the operating state from the front, top, and bottom sides without oblique viewing, enhancing visibility and usability of the electromagnetic contactor's state.
Implementation Method 1
an electromagnetic contactor moving a movable contactor by an electromagnetic force to open and close a contact
Data Source
AI summary
An electromagnetic contactor to open and close a contact formed by a movable contact and a fixed contact. The electromagnetic contactor includes an arc extinguishing cover having a shape in which a center portion is concaved with respect to an edge portion in a first direction and in which faces having a same height as the center portion continue in a second direction crossing the first direction; and an operation indicating piece arranged at an end of the movable contactor, to indicate a contact state of the contact by projecting from the center portion of the arc extinguishing cover or by being embedded therein. A step between the edge portion and the center portion of the arc extinguishing cover is equal to or larger than a projecting amount of the operation indicating piece that projects from the center portion of the arc extinguishing cover.