Rotary Machine Field Magnet Yoke Grooves Against Flux Leakage
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Solution Overview
Problem
Conventional rotary electric machines face challenges in preventing magnetic flux leakage while maintaining adequate magnet holding force, leading to reduced output torque and efficiency.
Innovation Solution
A field magneton design featuring a yoke with a flange that includes circumferential and radial grooves on its abutting surface, which enhances magnet holding force and prevents magnetic flux leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the tip end of the flange is separated away from each magnet, then magnetic flux leakage is reduced, but magnet holding force decreases
Solution Approach 1:
The invention applies different structural characteristics to different regions of the flange: the tip end region maintains contact with magnets for holding force, while groove regions create magnetic flux barriers. This local differentiation allows simultaneous achievement of both preventing magnetic flux leakage and maintaining magnet holding force.
Solution Approach 2:
The flange is segmented into multiple functional zones through grooves (radial grooves, circumferential grooves, and combined grooves) that divide the continuous flange structure into distinct regions. These segments create magnetic flux barriers while maintaining structural integrity and magnet contact at specific locations.
2Object-generated harmful factors
If the abutting area of the flange is reduced, then magnetic flux leakage is prevented, but magnet holding force decreases
Solution Approach 1:
The flange structure implements local quality by creating groove regions with reduced abutting area for magnetic flux prevention, while maintaining sufficient contact area at non-groove regions for adequate magnet holding force. This spatial differentiation resolves the contradiction between preventing magnetic flux leakage and maintaining holding force.
Solution Approach 2:
The grooves act as intermediary magnetic flux barriers that redirect and contain magnetic flux within desired paths. These groove structures serve as mediators that prevent magnetic flux leakage without requiring complete separation between the flange and magnets, thus maintaining holding force while preventing flux leakage.
3Object-generated harmful factors
If grooves are added to the abutting surface, then magnetic flux leakage is prevented, but device complexity increases
Solution Approach 1:
The flange is segmented into multiple functional zones through grooves that divide the continuous structure into distinct regions. This segmentation creates magnetic flux barriers to prevent leakage while maintaining a relatively simple overall flange geometry that is manufacturable and structurally sound.
Solution Approach 2:
Rather than making the entire flange complex, the invention applies grooves only at specific locations where magnetic flux leakage occurs. This localized modification approach prevents flux leakage while minimizing the increase in overall device complexity and maintaining manufacturing simplicity.
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 improves output torque and power generation efficiency by securely holding magnets and minimizing magnetic flux leakage through the flange.
Implementation Method 1
the abutting surface is provided with at least one of an annular circumferential groove (36) and a plurality of radial grooves (37), and thus magnetic flux is prevented from leaking to the outside through the flange
Implementation Method 2
the abutting surface is provided with at least one of an annular circumferential groove (36) and a plurality of radial grooves (37)... so that a magnet holding force can be improved
Data Source
AI summary
A field magneton of a rotary electric machine includes magnets, and a yoke provided along one of an inner peripheral surface and an outer peripheral surface of each magnet. The yoke includes a cylindrical main body extending in an axial direction from a first end surface of each magnet to a second end surface thereof, and an annular flange extending from the main body in a radial direction and including an abutting surface configured to abut against the first end surface of each magnet. The abutting surface is provided with at least one of an annular circumferential groove and radial grooves. The circumferential groove is formed at an intermediate position separated away from a base edge and a tip edge of the abutting surface. The radial grooves are formed at prescribed intervals and extend from the base edge to the tip edge.