Halbach Arc Path Structure for DC Relay Arc Extinguishing
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Solution Overview
Problem
Existing DC relays face challenges in efficiently extinguishing and discharging arcs generated during contact separation, which can damage internal components, and lack effective structures for controlling the arc discharge path and magnetic field direction.
Innovation Solution
An arc path formation unit utilizing a Halbach array with specific magnetic field configurations, including a magnetic frame and multiple blocks with controlled polarities, to guide and extinguish arcs effectively, minimizing damage to internal components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnets are provided in the DC relay to form an arc discharge path, then an arc discharge path is formed by electromagnetic force, but the generated arc may not be immediately moved to the outside or sufficiently extinguished, causing damage to internal components
Solution Approach 1:
The Halbach array is divided into multiple blocks (first block, second block, third block) with different magnetization directions. Each block segment contributes to shaping the magnetic field in a specific region, creating a controlled arc discharge path that directs the arc away from internal components while ensuring effective extinguishment.
Solution Approach 2:
Different regions of the Halbach array have locally optimized magnetization properties. The first block has a surface magnetized in a first direction, the second block in a second direction, and the third block in a third direction. This local variation in magnetic quality creates the desired arc discharge path geometry, directing arcs away from sensitive components.
2Measurement precision
If a Halbach array with multiple blocks is used to control magnetic field direction, then precise control over magnetic field direction and intensity is achieved, but the device complexity increases
Solution Approach 1:
The Halbach array employs an asymmetric magnetization pattern where adjacent blocks are magnetized in different directions. The first block is magnetized in a first direction, the second block in a second direction, and the third block in a third direction. This asymmetric arrangement creates a unidirectional magnetic field enhancement effect, achieving precise directional control while maintaining a relatively simple block structure.
Solution Approach 2:
The patent utilizes the inverse property of magnetization directions in the Halbach array. By magnetizing adjacent blocks in opposite or different directions, the magnetic fields from individual blocks combine constructively in the desired direction while canceling out in other directions. This inversion strategy achieves precise field control without requiring complex external field generation systems.
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 solution efficiently guides arcs away from critical components, effectively extinguishes them, and allows precise control over magnetic field direction and intensity, reducing damage and enhancing the reliability of DC relays.
Implementation Method 1
a Halbach array including a plurality of blocks producing magnetic fields in the space portion
Implementation Method 2
a Halbach array including a plurality of blocks producing magnetic fields in the space portion, arranged adjacent to an inner circumferential surface of the magnetic frame
Implementation Method 3
An electromagnetic force generated by the produced magnetic fields and the flow of current forms a discharge path of the arc
Implementation Method 4
an arc is generated between the fixed contact and the movable contact. The arc is a flow of high-pressure and high-temperature current
Data Source
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AI summary
The present invention provides an arc path formation unit, which can effectively guide a generated arc to the outside, and a direct current relay comprising same, the arch path formation unit comprising: a magnetic frame; and a Halbach array arranged to be adjacent to the inner circumferential surface of the magnetic frame so as to form a magnetic field inside the magnetic frame, wherein the Halbach array includes first, second and third blocks, which are arranged to be parallel in one direction, and the first block has a surface facing the third block, which is magnetized with a polarity opposite to that of the surface of the third block facing the first block.