Flat Angle Coil Stator Teeth Geometry for Lower Eddy Current Loss
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Solution Overview
Problem
Existing electric motors with flat angle coils experience increased eddy current loss due to the large surface area of the coils, which generates significant energy inefficiencies.
Innovation Solution
The stator design incorporates teeth with widened portions closer to the inner surface and narrowed portions with varying thicknesses to reduce eddy current loss, utilizing asymmetrical or symmetrical configurations to minimize magnetic flux saturation and leakage flux.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If flat angle coils are used to improve space factor, then energy efficiency is improved, but eddy current loss increases due to large surface area
Solution Approach 1:
The tooth structure is designed with a widened portion at the tip that gradually transitions to a narrower base, creating non-uniform local geometry. This local quality change reduces magnetic flux density concentration at the coil surface while maintaining overall structural integrity and space factor benefits.
Solution Approach 2:
The tooth cross-section transitions from a conventional uniform shape to a three-dimensional tapered structure with widened tips. This dimensional change in the radial-circumferential plane reduces the effective surface area exposed to magnetic flux while preserving the coil winding space, thereby reducing eddy current loss without sacrificing energy efficiency.
2Reliability
If the tooth width is increased to reduce magnetic flux saturation, then the space for coils is reduced, but the motor size increases
Solution Approach 1:
The tooth geometry is optimized with localized widening at the tip region where magnetic flux concentration occurs, while the base portion maintains compact dimensions. This local quality adjustment reduces magnetic flux saturation at critical areas without increasing overall motor volume.
Solution Approach 2:
The tooth tip features a curved, rounded profile rather than sharp edges, creating a smoother magnetic flux path. This curvature distributes magnetic flux more evenly across the tooth surface, reducing saturation effects while maintaining compact motor dimensions.
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 effectively reduces eddy current loss by minimizing magnetic flux saturation and leakage flux, maintaining energy efficiency while preventing an increase in motor size.
Implementation Method 1
reducing magnetic flux saturation and leakage
Implementation Method 2
an eddy current is generated when a magnetic flux from a permanent magnet or the like reaches the flat angle coil when a rotor rotates
Data Source
AI summary
A stator includes a stator core having a plurality of slots opening toward an inner surface and a plurality of teeth formed between the slots adjacent to each other; and flat angle coils wound around the teeth respectively. Each of the teeth includes a widened portion having a width in a circumferential direction of the inner surface, closer to the inner surface and the widened portion becomes wider, in a cross-sectional view taken along a cross section perpendicular to a rotational axis of a rotor surrounded by the stator core.