Rotor Retaining Piece With Bosses For V-Shaped Cavities
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Solution Overview
Problem
Existing rotor designs for rotating electrical machines face challenges in effectively holding permanent magnets within cavities of complex profiles, leading to inefficiencies during assembly and potential material loss during manufacturing.
Innovation Solution
The rotor incorporates a retaining piece with two elongated strips, each featuring bosses to apply a holding force and connecting arms between them, allowing for better positioning within V-shaped cavities and reducing material waste during production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single flexible strip is used to hold permanent magnets in cavities, then the structure is simple, but the positioning is difficult in V-shaped cavities and holding effectiveness is reduced
Solution Approach 1:
The retaining piece is divided into two separate elongated strips instead of using a single strip. Each strip can be independently positioned and inserted into the V-shaped cavity, making assembly easier while maintaining structural simplicity. The segmentation allows each strip to conform to one side of the V-shaped cavity, improving positioning accuracy without significantly increasing overall complexity.
2Productivity
If traditional retaining pieces are used in V-shaped cavities, then material usage is efficient, but assembly effectiveness and holding force are reduced
Solution Approach 1:
The retaining piece design adds a new dimension by incorporating connecting arms that extend between the two elongated strips. This dimensional addition allows the retaining piece to span across the V-shaped cavity more effectively, improving assembly efficiency by providing better geometric compatibility with the cavity shape while optimizing material utilization during the cutting process.
3Force
If bosses are added to apply holding force, then the holding effectiveness improves, but the device complexity increases
Solution Approach 1:
Bosses are added only at specific locations on the elongated strips where they directly contact the permanent magnets, rather than uniformly across the entire structure. This localized addition of features provides the necessary holding force at critical points while minimizing the overall increase in structural complexity. The bosses are strategically positioned to maximize holding effectiveness with minimal added complexity.
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 facilitates the assembly of permanent magnets in V-shaped cavities and minimizes material loss during sheet metal cutting, enhancing the holding force and assembly efficiency of the rotor.
Implementation Method 1
the boss extending axially between the two connecting arms... the holding force is applied by the boss on the corresponding permanent magnet in the direction of an outer periphery of the rotor body
Implementation Method 2
each strip of the holding piece comprises a spring for applying an axial holding force to the permanent magnet in the corresponding cavity
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates primarily to a rotating electrical machine comprising a rotor (10) equipped with a body (12) having an axis (X), the rotor body (12) having a plurality of longitudinal cavities (16) arranged to receive at least one permanent magnet (13), - magnetic poles formed each by the permanent magnets (13) housed in two adjacent cavities (16) forming a V in a plane orthogonal (P) to the axis (X) of the rotor body (12), - the rotor (10) comprising at least one retaining element (35) for the permanent magnets (13) in the cavities (16), characterized in that the retaining element (35) comprises two elongated bands (36), each band (36) having at least one boss (37) for applying a retaining force to the corresponding permanent magnet (13) in the cavity (16), and in that the retaining element (35) further comprises at least two connecting arms (40) between the two bands (36),the boss (37) extending axially between the two connecting arms.