Stator With Intermediate Teeth For Torque Density
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Concentrated winding topology in electrical machines results in lower torque density due to suboptimal winding factor, which is further compromised by cogging issues when trying to achieve ideal alignment between stator and rotor poles.
Innovation Solution
A stator with a non-uniform tooth pattern featuring short and long tooth spans, where intermediate teeth are introduced between stator teeth separated by long tooth spans to optimize flux distribution and winding factor, allowing perfect alignment with rotor poles and enhancing torque density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If concentrated winding topology is used, then copper material is reduced and torque density is improved, but winding factor is lowered from ideal value
Solution Approach 1:
The patent applies asymmetry by introducing a non-uniform stator tooth pattern where certain stator teeth are positioned closer together (shorter angular distance) than others. This asymmetric arrangement optimizes the winding factor for concentrated windings, allowing the winding factor to reach ideal values while maintaining the copper material savings of concentrated topology. The non-uniform distribution creates favorable alignment between stator teeth and rotor poles during operation.
2Power
If non-uniform stator tooth pattern is introduced to improve winding factor, then torque density increases, but stator structure becomes more complex
Solution Approach 1:
The patent applies local quality by modifying only specific regions of the stator tooth pattern rather than changing the entire structure uniformly. Certain stator teeth are positioned at non-uniform angular distances while others maintain standard spacing. This localized modification achieves the desired winding factor optimization and torque density improvement without requiring complete redesign of the entire stator, thus limiting the increase in structural complexity.
3Ease of manufacture
If uniform stator tooth distribution is used, then manufacturing is simplified, but winding factor remains suboptimal for concentrated windings
Solution Approach 1:
The patent resolves this contradiction by implementing asymmetry in the stator tooth angular distribution. Instead of uniform spacing, certain teeth are positioned at varied angular distances from each other. This asymmetric pattern optimizes the winding factor for concentrated windings while still allowing for practical manufacturing through standardized tooth profiles and modular assembly approaches.
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 non-uniform tooth pattern increases the winding factor to ideal values, improving torque density and enabling efficient mechanical segmentation of the stator without affecting magnetic properties.
Implementation Method 1
each of the stator slots between two stator teeth distanced by a long tooth span comprises an intermediate tooth for carrying a magnetic flux
Data Source
AI summary
A stator for an electrical machine, the stator including a plurality of stator teeth distributed in a non-uniform pattern with a short and long tooth spans along a circumference of the stator, wherein each stator slot between two stator teeth distanced by a long tooth span including an intermediate tooth for carrying a magnetic flux.