Eddy Current Drive System with Segmented Magnet Discs
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Solution Overview
Problem
Existing drive systems using permanent magnets on synchronous motors face inefficiencies and directional force issues due to high losses and unwanted force components when generating traction forces through eddy currents.
Innovation Solution
A drive system comprising a sword part and two rotatable discs with permanent magnets on their circumference, where the direction of magnetization alternates, generating propulsion force through eddy currents induced in the sword part, with the discs' axes of rotation parallel and aligned radially opposite to the nearest magnets, allowing for efficient and directional force generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If permanent magnets are positioned close to the sword part to increase propulsion force, then the feed force increases, but losses increase due to unwanted force components in other directions
Solution Approach 1:
The system uses two separate discs with permanent magnets instead of a single disc, allowing independent control and optimization of magnetic field generation. This segmentation enables precise control over the magnetic field interaction with the sword part, maximizing propulsion force while minimizing unwanted force components and associated losses.
Solution Approach 2:
The invention optimizes the angular offset between the two discs as a controllable parameter. By adjusting this angular offset, the system can maximize the beneficial tangential force components while minimizing radial and other unwanted force components, thereby reducing losses when permanent magnets are positioned close to the sword part.
2Ease of manufacture
If traditional manufacturing methods are used for the sword part, then production flexibility is maintained, but production complexity and cost increase
Solution Approach 1:
The sword part is integrated directly into the rail system as a combined structure, eliminating the need for separate manufacturing and assembly processes. This merging of functions simplifies production by allowing the sword part to be produced as part of the rail infrastructure using conventional casting or extrusion methods.
Solution Approach 2:
The rail system serves multiple functions: it provides structural support, guidance, and integrates the sword part for eddy current propulsion. This multi-functionality reduces the number of separate components and simplifies the overall production 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 configuration reduces losses and ensures propulsion force is primarily in the direction of movement, enabling gentle and efficient driving with minimal unwanted force components, allowing for quick force adjustments and high magnetic field efficiency.
Implementation Method 1
the driving force being generated by means of eddy currents induced in the blade part by the disks rotating past the blade part
Implementation Method 2
driving force being generated by means of eddy currents induced in the blade part by the disks rotating past the blade part
Implementation Method 3
the disks each having permanent magnets on their circumference
Implementation Method 4
the propulsion force is generated with eddy currents
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a drive system comprising a first part (5) and a second part that can be moved in relation to said first part. The first part (5) has a strut-type part that extends in the direction of movement and is in particular elongated and the second part comprises two discs (3, 4) which can be driven and the rotational axes of the which run substantially parallel. The strut-type part (5) is positioned between the discs (3, 4) and each disc (3, 4) has permanent magnets around its circumference, the direction of magnetisation of each of said magnets pointing in an alternate direction to the direction of magnetisation of the neighbouring permanent magnet.