Magnetic Contactor B-Contact Switch Relocation for Miniaturization
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Solution Overview
Problem
In magnetic contactors, miniaturization is hindered by the limited space for the b-contact switch, making it difficult to maintain normal operation and prevent overcurrents in coils.
Innovation Solution
The b-contact switch is relocated to the lower portion of the product, and a switch manipulation member within the movable core operates the switch, allowing for miniaturization while ensuring normal operation and overcurrent limitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the b-contact switch is disposed at each of left and right sides of the product, then the normal operation of the magnetic contactor is ensured, but the product size cannot be miniaturized due to insufficient free space
Solution Approach 1:
The b-contact switch is relocated from the traditional left/right side positioning to the lower portion of the product, utilizing the vertical dimension for space optimization. This dimensional repositioning allows the switch to be accommodated in previously underutilized space, enabling product miniaturization while preserving operational functionality.
Solution Approach 2:
A switch manipulation member is introduced as an intermediary component to operate the b-contact switch from the lower portion. This mediator transfers the operational force from the movable core to the switch, enabling reliable operation despite the non-traditional switch positioning, thus resolving the contradiction between compact size and normal operation.
2Volume of moving object
If the product is miniaturized, then the free space for the b-contact switch becomes sufficient, but it becomes difficult to dispose the switch at the required position for normal operation
Solution Approach 1:
The switch manipulation member serves as a mechanical intermediary that bridges the gap between the movable core and the b-contact switch positioned in the lower portion. This intermediary component ensures that the switch can be reliably actuated even when disposed at an unconventional location, maintaining ease of operation despite miniaturization.
Solution Approach 2:
The switch manipulation member is designed with dynamic characteristics, allowing it to flex and transmit force effectively from the movable core to the b-contact switch. This dynamic design ensures reliable switch operation within the constrained space of the miniaturized product.
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 secures space for the b-contact switch, enabling product miniaturization and effective overcurrent limitation without enlarging the product size, ensuring reliable operation.
Implementation Method 1
When external power is applied to a coil which is wound around the bobbin, a fixed core is changed to an electromagnet by a magnetic field which is generated around the coil
Implementation Method 2
a movable core is absorbed into a fixed core by a magnetic force
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
Disclosed is a magnetic contactor. The magnetic contactor includes a fram, a holder, a movable core, a bobbin, a fixed core coupled to a side of the bobbin and configured to absorb the movable core with a magnetic force, an elastic member provided between the holder and the bobbin, a b-contact switch configured to sense a closing completion time of the movable contact by using a mechanical mechanism relationship with the movable core, an electronic circuit part configured to receive a sensing signal from the b-contact switch and limit a current applied to the coil, and a switch manipulation member provided at one end of the movable core and configured to operate the b-contact switch.