Motor Coil Cross-Sectional Area Variation for Thermal Management
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Solution Overview
Problem
Existing motor designs face inefficiencies due to uneven heat distribution and radiation in coils, leading to reduced motor performance, as heat tends to accumulate in the center portion of uniform cross-sectional coils, limiting thermal efficiency.
Innovation Solution
The design features a stator with teeth protruding from the core, allowing coils to be wound with varying cross-sectional areas, where the center turns are smaller, enabling heat to radiate more effectively towards the ends, thereby enhancing thermal efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If coils are made uniform in cross-sectional area to achieve uniform resistance, then electrical performance is improved, but heat radiation efficiency deteriorates because heat accumulates in the center portion
Solution Approach 1:
The patent applies local quality by making different portions of the coil have different cross-sectional areas. Specifically, the end portions of the coil are designed with larger cross-sectional areas than the center portion, creating localized variations that optimize heat radiation from different regions of the coil simultaneously.
Solution Approach 2:
The patent employs asymmetry by deliberately designing the coil with non-uniform cross-sectional area distribution along its length. The end portions are made asymmetrically larger compared to the center, breaking the uniform symmetry to achieve better thermal performance while maintaining electrical functionality.
2Loss of energy
If coils are made with larger cross-sectional area to reduce resistance, then electrical efficiency is improved, but heat accumulation worsens because heat radiation effects are concentrated
Solution Approach 1:
The patent applies local quality by making different portions of the coil have different cross-sectional areas. Specifically, the end portions of the coil are designed with larger cross-sectional areas than the center portion, creating localized variations that optimize heat radiation from different regions of the coil simultaneously.
Solution Approach 2:
The patent employs asymmetry by deliberately designing the coil with non-uniform cross-sectional area distribution along its length. The end portions are made asymmetrically larger compared to the center, breaking the uniform symmetry to achieve better thermal performance while maintaining electrical functionality.
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 configuration increases heat radiation effects, achieving a highly efficient motor by ensuring heat can easily dissipate from the center to the ends of the coils, thus improving overall thermal efficiency.
Implementation Method 1
heat radiation effects due to the coils are concentrated within the cross-sectional areas
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
A motor includes a stator including a stator core and teeth respectively protruding from the stator core in predetermined directions of protrusion, and coils respectively wound onto the teeth n (n is an integer of 3 or greater) turns including first to n-th turns. A k-th (k is an integer, 1 < k < n) turn of each of the coils lies at a center of a range wound with each of the coils onto the teeth in a corresponding one of the directions of protrusion of the teeth from the stator core. Each of the first turn and the n-th turn when each of the coils is cut in a corresponding one of the directions of protrusion of the teeth is greater in cross-sectional area than the k-th turn.