Electromagnetic Switch Yoke Slits for Stable Holding Force
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Solution Overview
Problem
In electromagnetic switches, the magnetic flux generated by high currents affects the attractive force on the contact pole surface, leading to unstable operation.
Innovation Solution
The electromagnetic switch design includes magnetic paths on the contact pole surface of the magnetic yoke, formed by slits or radial slit portions, which enhance the holding force by utilizing external magnetic fluxes generated by the current, preventing the movable contact from disengaging from the fixed contacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electromagnet device is disposed below the fixed contacts and movable contact to enable current flow, then the switching function is achieved, but the magnetic fluxes generated by the flowing current affect the attractive force on the contact pole surface, leading to unstable operation
Solution Approach 1:
The patent converts the harmful magnetic fluxes generated by the flowing current into a beneficial holding force. By forming magnetic paths on the contact pole surface of the magnetic yoke, the external magnetic fluxes are guided to enhance the holding force between the movable plunger and magnetic yoke, thereby preventing unintended disengagement and ensuring stable operation during high current flow
Solution Approach 2:
The patent introduces magnetic paths as an intermediary structure between the external magnetic fluxes and the contact pole surface. These magnetic paths, formed by slits or radial slit portions on the magnetic yoke, mediate the interaction by channeling the external magnetic fluxes to specifically enhance the holding force in the contact region, isolating the electromagnet device from direct magnetic flux interference
2Power
If high current of several hundred to several thousand amps flows through the contacts, then the switching capacity is achieved, but the magnetic fluxes generated affect the attractive force, causing potential contact disengagement
Solution Approach 1:
The patent transforms the detrimental magnetic fluxes generated by high current into a useful holding force. The magnetic paths on the contact pole surface capture and concentrate the external magnetic fluxes, converting them into an additional holding force that counteracts the tendency of the movable plunger to disengage under high current conditions
Solution Approach 2:
The patent applies local quality by forming magnetic paths specifically on the contact pole surface where the holding force is most needed. The slits or radial slit portions are strategically positioned to concentrate magnetic flux in the critical contact region, enhancing the holding force locally without affecting the overall electromagnet device structure
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 design secures a stable operation by maintaining the holding force even with high currents, preventing unintended disengagement and ensuring reliable contact switching.
Implementation Method 1
magnetic paths through which a holding force is generated by external magnetic fluxes generated by a flowing current
Implementation Method 2
holding force is generated by external magnetic fluxes generated by a flowing current when the movable contact contacts the pair of fixed contacts
Data Source
AI summary
An electromagnetic switch includes a pair of fixed contacts disposed and fixed in a contact housing case with a predetermined distance therebetween; a movable contact disposed in the contact housing case so as to contact and separate from the pair of fixed contacts; and an electromagnet unit which brings the movable contact into and out of contact with the pair of fixed contacts. The electromagnet unit has a magnetic yoke enclosing an exciting coil, a movable plunger having a contact pole surface facing the contact pole surface of the magnetic yoke, and a linking shaft which links the movable plunger and the movable contact, and magnetic paths through which a holding force is generated by external magnetic fluxes generated by a flowing current when the movable contact contacts the pair of fixed contacts, are formed on the contact pole surface of the magnetic yoke.