Rotor Groove Orientation for Tooth Base Rigidity
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Solution Overview
Problem
Rotors for rotary electrical machines face issues with reduced resistance to deformation at the base of teeth due to uniform groove orientation, leading to potential contact with the stator during high-speed rotation, which compromises mechanical integrity.
Innovation Solution
The grooves receiving magnetic elements are strategically produced to emerge at different axial ends of the rotor, with each tooth having a single groove at the base and the adjacent tooth's groove at the tip, or vice versa, to distribute the deformation resistance and prevent premature contact with the stator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If grooves are produced in both lateral faces of adjacent teeth emerging at the same axial end of the rotor, then the manufacturing process is simplified and magnetic elements are easier to install, but the base of the tooth becomes less resistant to deformation during high-speed rotation
Solution Approach 1:
The patent applies local quality by differentiating the groove configuration between adjacent teeth. Specifically, one tooth has grooves emerging at the base while the adjacent tooth has grooves emerging at the tip. This local variation optimizes each tooth's structural integrity while maintaining overall magnetic element retention, resolving the contradiction between ease of manufacture and tooth base strength.
2Ease of operation
If grooves emerge at the base of the tooth, then magnetic elements are easier to install, but the tooth deforms radially during high-speed rotation increasing contact risk with the stator
Solution Approach 1:
The patent employs asymmetry by creating an alternating pattern where adjacent teeth have different groove emergence positions (one at base, one at tip). This asymmetric configuration distributes deformation stresses more evenly during rotation, reducing the risk of radial deformation and stator contact while still allowing easy installation of magnetic elements through the alternating groove positions.
3Device complexity
If all grooves emerge at the same axial end of the rotor, then manufacturing is simplified, but the elastic resistance to deformation of the tooth base is reduced
Solution Approach 1:
The patent segments the groove configuration into two distinct groups: grooves emerging at the base of certain teeth and grooves emerging at the tip of adjacent teeth. This segmentation approach maintains manufacturing simplicity while distributing the structural load more effectively, preserving the elastic resistance to deformation of the tooth base during high-speed operation.
Data Source
AI summary
A rotor for an electrical machine that comprises two parallel magnet wheels, each of which comprises axial teeth so that each tooth on a wheel is situated in the space existing between two consecutive teeth on the other wheel, and that comprises magnetic elements, each arranged between two adjacent teeth and partly received in a groove produced in each of the opposite lateral faces of the two adjacent teeth. In one embodiment, each of the two adjacent teeth comprises one groove at a maximum, which emerges at the base of the first tooth.