Permanent Magnet Chuck Structure for Low-Loss Machining
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Solution Overview
Problem
Conventional electric permanent magnetic chucks face difficulties in machining due to complex structures and high magnetic loss, leading to inferior-quality products and increased costs.
Innovation Solution
The design features a housing with an opened inner cavity containing a reversible magnetic material and a coil along its outer wall, with a magnetic pole embedded in the cavity and an annular groove for the permanent magnetic material, allowing for simpler machining and reduced magnetic loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the distance from the bottom of the groove to the outer surface of the housing is made very small to maximize the magnetic field, then the magnetic field strength is improved, but the machining process becomes very difficult and product quality deteriorates
Solution Approach 1:
The housing is divided into multiple segments including a first housing portion, second housing portion, and third housing portion. The groove is formed only in the first housing portion, allowing adequate machining space while maintaining the required small distance to the outer surface for strong magnetic field generation.
2Adaptability or versatility
If multiple inner cavities with different cross sections are formed in the housing to place reversible magnetic material and cover plate, then the functional requirements are met, but the structure becomes complex and machining difficulty increases
Solution Approach 1:
The housing is segmented into multiple portions, with the first housing portion containing the reversible magnetic material and the second housing portion containing the cover plate. This segmentation allows each portion to be optimized independently, simplifying the overall structure and machining process.
Solution Approach 2:
The first housing portion serves multiple functions: it contains the reversible magnetic material, provides the groove for permanent magnetic material, and forms part of the sealed cavity. This multi-functionality reduces the need for separate structures, simplifying the overall housing design.
3Ease of operation
If passages are added to the housing for placing excitation coil wires, then the electrical connectivity is achieved, but the machining difficulty and structural complexity increase
Solution Approach 1:
The passage for excitation coil wires is integrated into the first housing portion, combining the wire routing function with the structural housing element. This eliminates the need for separate wire channels or complex routing structures, simplifying both the design and machining process.
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 simplifies the machining process, improves precision, reduces rejection rates, and minimizes magnetic loss, resulting in a more effective clamping mechanism with enhanced sealing properties.
Implementation Method 1
A magnetic pole of the reversible magnetic material may be changed under the control of an external circuit
Implementation Method 2
the magnetic field generated by the reversible magnetic material and the magnetic field generated by the permanent magnetic material are overlapped one another to jointly form magnetic field acting on the exterior, to absorb a material
Implementation Method 3
an internal balance is achieved between a magnetic field generated by the reversible magnetic material and a magnetic field generated by permanent magnetic material in the electric permanent magnetic chuck, and thus there is no magnetic field acting on the exterior
Data Source
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AI summary
An electric permanent magnet chuck, comprising a casing (1), the casing being provided thereon with at least one open inner cavity; reversible magnetic steel (2) is provided at a lower portion of the inner cavity, and a coil (3) is arranged in the inner cavity along an outer wall of the reversible magnetic steel; a magnetic pole (4) is superposed and fixed in the inner cavity, an annular groove being provided at a lower surface of the magnetic pole, and permanent magnet steel (5) that matches the annular groove being disposed in the annular groove. The electric permanent magnet chuck has the advantages of a simple structure, low processing difficulty, good sealing performance, small magnetic loss and so on.