Magnetic Switch Guide Portion Core Alignment
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Solution Overview
Problem
Magnetic switches in electric vehicles face degradation in breaking efficiency due to misalignment of the fixed and movable cores, leading to friction, abrasion, and voltage loss, caused by the manufacturing process of the cylinder which results in a tilted structure and interference.
Innovation Solution
A magnetic switch design featuring a bobbin with a cylindrical body and flanges, where a guide portion on the inner surface of the bobbin allows the movable core to move linearly along the central axis of the fixed core, maintaining a uniform surface and reducing friction, and the removal of the cylinder reduces component count and assembly complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the cylinder is fabricated by deep drawing pressing, then the cylinder structure is formed, but the cylinder has a tilted structure causing misalignment between fixed core and movable core centers
Solution Approach 1:
The patent removes the cylinder component entirely from the design. Instead of using a deep-drawn cylinder that causes misalignment, the invention uses a bobbin structure with guide portions formed directly on it, eliminating the source of the alignment problem while maintaining the necessary support and guidance functions.
Solution Approach 2:
The patent combines the support and guidance functions into the bobbin structure itself. The guide portions are formed directly on the bobbin, merging what were previously separate components (cylinder and guide structure) into a single integrated component, thereby ensuring precise core alignment.
2Ease of operation
If the movable core is made slightly smaller than the cylinder inner diameter to avoid interference, then interference is prevented, but friction and abrasion occur due to the gap between movable core and cylinder
Solution Approach 1:
The patent removes the cylinder component that created the friction and abrasion problems. By eliminating the cylinder and using guide portions formed on the bobbin instead, the invention achieves smooth movable core motion without the harmful friction and abrasion that occurred in the previous design.
3Productivity
If the movable core and fixed core centers are misaligned, then assembly is easier, but magnetic force is not utilized effectively causing degradation of breaking efficiency
Solution Approach 1:
The patent uses guide portions formed on the bobbin as an intermediary structure that ensures precise alignment between the movable core and fixed core centers. These guide portions act as a mediator that maintains accurate center alignment during assembly and operation, maximizing magnetic force utilization and breaking efficiency.
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 ensures optimized breaking performance by aligning the cores, minimizing friction and voltage loss, reducing manufacturing costs, and simplifying assembly while maintaining the use of magnetic force effectively.
Implementation Method 1
a magnetic path is formed along the plate 5, the yoke 5c, the movable core 7 and the fixed core 6, by a magnetic field generated in the coil 5b
Implementation Method 2
the movable core 7 is attracted to the fixed core 6 by a magnetic force generated in the fixed core 6
Data Source
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AI summary
The present invention relates to a magnetic switch, and more particularly, a magnetic switch capable of preventing degradation of breaking efficiency by utilizing magnetic force to the utmost, in a manner of matching contact centers of fixed and movable cores. A magnetic switch according to one embodiment includes a bobbin (31) provided with a cylindrical body (32) and a plurality of flanges (33) and having a coil (35) wound on an outer circumferential surface thereof, a fixed core (20) fixed to an inside of the cylindrical body with a predetermined spaced interval from the cylindrical body, and a movable core (25) slidably installed in the cylindrical body and contactable with or separated from the fixed core, wherein a guide portion (34) protrudes from a lower portion of the cylindrical body along an inner circumferential surface of the cylindrical body, such that the movable core can linearly move along a central axis of the fixed core.