Eddy Current Transport Device With Self-Centering Reaction Surface
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Solution Overview
Problem
Existing transport devices face challenges in achieving a long service life due to transverse forces and wear from misalignment of reaction surfaces, which affect the precision and durability of the transport mechanism.
Innovation Solution
The transport device incorporates a system with rotating disks that generate a strong axial magnetic field when stationary, featuring a spring element and axial movement capability, a reaction surface made of aluminum, and a pivot bearing for self-centering, allowing for minimal air gap and reduced wear, enabling smooth movement and cornering with reduced lateral forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the reaction surface is made of steel, then the strength is high, but the energy losses are high
Solution Approach 1:
The reaction surface uses a composite structure combining aluminum (non-magnetic material) for the active surface to minimize eddy current losses, with steel reinforcement elements (such as aluminum profile with steel core or steel brackets) providing mechanical strength and structural support. This composite approach resolves the contradiction by separating the functional requirements: aluminum reduces energy losses while steel maintains structural integrity
2Force
If the air gap between turntables and reaction surface is reduced, then the feed force increases, but the risk of contact and wear increases
Solution Approach 1:
The system employs self-centering mechanisms including loose bearings that allow the reaction surface to automatically align with the turntables, and spring elements that maintain optimal air gap spacing. These self-adjusting features enable the system to maintain minimal air gap for high feed force while automatically compensating for misalignment, preventing contact and wear without requiring external intervention
Solution Approach 2:
The reaction surface is designed with axial movement capability through loose bearings and spring elements, allowing dynamic adjustment of the air gap. This dynamic configuration enables the system to adapt to position deviations, maintaining optimal spacing that maximizes feed force while preventing contact between turntables and reaction surface
3Manufacturing precision
If mechanical or electromagnetic centering is used to achieve smallest air gap, then the feed force precision improves, but the device complexity increases
Solution Approach 1:
The system uses self-centering mechanisms where loose bearings and spring elements automatically align the reaction surface with the turntables during operation. This self-adjusting centering eliminates the need for complex external mechanical or electromagnetic centering devices, achieving precise air gap control through the system's own structural features
Solution Approach 2:
Spring elements act as intermediaries between the reaction surface and its mounting structure, providing both centering force and optimal spacing. These spring elements mediate the positioning, automatically adjusting to achieve the smallest safe air gap without requiring complex control 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
This configuration ensures a high degree of security against contact and wear, achieving a long service life by minimizing transverse forces and allowing for precise centering and smooth operation even when the reaction part deviates from its ideal position.
Implementation Method 1
An eddy current drive is known from US Pat. No. 6,510,799 B2 and US Pat. No. 6,899,036 B2
Implementation Method 2
a strong field can be generated as precisely as possible in the axial direction when the rotating disks are at rest
Data Source
Figure 1
Figure 1a
Figure 2
AI summary
The invention relates to a transport device, comprising two parts disposed displaceably opposite each other in the direction of motion, wherein a first part comprises a drive unit comprising at least two axially spaced rotating discs driven by an electric motor, wherein magnets circumferentially spaced from each other are disposed on each rotating disc, said magnets comprising different magnetization directions, wherein the magnetization direction of the magnets is provided either in or opposite to the motor axle direction, wherein each magnet of the one rotating disc is disposed axially opposite a magnet of the other rotating disc, so that the associated main flux is oriented axially, particularly that a north pole of the first rotating disc is opposite a south pole of the other rotating disc, and vice versa, wherein a second part comprises a reaction surface, particularly a blade entering the region between the magnets, that is, the main flux region, for generating the driving force.