Rotary Electric Machine Eddy Current Magnet Rotation
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Solution Overview
Problem
Existing rotary electric machines and non-contact power generators face limitations in magnetic efficiency and are prone to magnetic flux leakage due to the limited magnetic coupling between the permanent magnet and the moving body, single-phase coil configuration, high magnetic resistance, and lack of a yoke, which affects power generation efficiency.
Innovation Solution
A rotary electric machine design featuring a permanent magnet rotated by eddy currents produced in a moving body, with multiple magnetic poles and coils strategically positioned to maximize magnetic flux linkage, and the use of a magnetic flux guide member to reduce leakage and enhance magnetic efficiency, including a yoke to improve magnetic permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the permanent magnet is disposed to face a limited area of the moving body, then the structure is simple, but the magnetic coupling between the permanent magnet and the moving body cannot be increased
Solution Approach 1:
The patent extends the magnetic coupling area from a limited two-dimensional face-to-face arrangement to a three-dimensional configuration by having the permanent magnet's side surface continuously contact the moving body's outer peripheral surface. This dimensional transition allows magnetic flux to propagate through both the main surface and side surface of the permanent magnet, significantly increasing the effective magnetic coupling area without complicating the overall structure.
Solution Approach 2:
The permanent magnet is positioned such that its side surface is continuously disposed along the outer peripheral surface of the moving body, creating a nested configuration where the magnet wraps around or follows the contour of the moving body. This nesting arrangement maximizes the contact area between magnetic components while maintaining a compact structure.
2Device complexity
If a single phase coil is wound around the permanent magnet, then the coil structure is simple, but the magnetic flux from parts of the permanent magnet where the coil is not wound cannot be effectively utilized
Solution Approach 1:
The patent divides the coil structure into multiple phases (at least two phases) that are spatially distributed around the permanent magnet. Each phase coil captures magnetic flux from different angular positions, ensuring that the entire circumference of the permanent magnet contributes to power generation. This segmentation allows effective utilization of magnetic flux from all parts of the permanent magnet while maintaining a relatively simple overall structure.
Solution Approach 2:
The multi-phase coil configuration serves multiple functions simultaneously: it captures magnetic flux from different regions of the permanent magnet, generates power during different rotational positions, and provides redundant power generation paths. This multi-functionality ensures effective utilization of the entire permanent magnet surface area.
3Speed
If the permanent magnet rotates at the same speed as the moving body, then the synchronization is simple, but the rotational force becomes insufficient to drive the permanent magnet
Solution Approach 1:
The patent creates an asymmetric speed relationship between the permanent magnet and the moving body, where the permanent magnet rotates at a different speed (typically slower) than the moving body. This asymmetry is achieved by having the side surface of the permanent magnet continuously contact the moving body, creating a differential rotation mechanism that generates sufficient rotational force through the interaction of magnetic flux and eddy currents while maintaining practical operating speeds.
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 design achieves higher magnetic efficiency and reduced magnetic flux leakage, resulting in enhanced power generation capabilities and increased rotational force of the permanent magnet.
Implementation Method 1
eddy currents produced in the main surface of the moving body in such a direction as to hinder a change of magnetic flux from the permanent magnet
Implementation Method 2
magnetic flux from the permanent magnet
Implementation Method 3
when a coil is wound around the permanent magnet and the magnetic flux from the permanent magnet is linked with the coil, it is possible to obtain an induced electric power from the coil
Data Source
AI summary
Provided is a rotary electric machine including: a permanent magnet rotatable around a first rotational shaft and disposed at a distance from a main surface of a moving body rotating or moving, at least a part of a side surface of the permanent magnet continuous to an outer peripheral surface thereof being opposed to the main surface of the moving body, wherein the permanent magnet is rotated around the first rotational shaft by a reaction force acting on the permanent magnet, the reaction force being caused by eddy currents produced in the main surface of the moving body in such a direction as to hinder a change of magnetic flux from the permanent magnet, and a surface speed of the side surface of the permanent magnet opposed to the moving body is lower than a surface speed of the main surface of the moving body opposed thereto.