Internal Stator Tooth Groups With Thermal Inserts for Motor Cooling
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Solution Overview
Problem
Existing rotating-field machines, particularly external-rotor motors, face limitations in increasing power and efficiency due to inadequate heat dissipation and weight reduction, with existing cooling methods being expensive and inefficient.
Innovation Solution
The introduction of intermediate elements made from materials with higher thermal conductivity and lower density than the pole cores, arranged between stator tooth groups, which also allow for fluid-type cooling arrangements or heatpipes, enhancing axial heat conduction and reducing stator weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional cooling methods are used, then cooling function is provided, but device complexity and cost increase significantly
Solution Approach 1:
The patent extracts the cooling function from a separate complex cooling arrangement and integrates it into the stator structure itself. The stator teeth and magnetic return means serve dual purposes: magnetic flux conduction and heat dissipation, eliminating the need for additional dedicated cooling components.
Solution Approach 2:
The stator components (teeth and magnetic return means) are designed to perform multiple functions simultaneously: conducting magnetic flux and dissipating heat. This multi-functionality reduces overall device complexity by combining what were previously separate functions into unified structural elements.
2Temperature
If conventional stator materials are used, then magnetic circuit function is provided, but heat dissipation efficiency and weight are suboptimal
Solution Approach 1:
The patent applies different material properties to different parts of the stator. The stator teeth are made from materials optimized for magnetic flux conduction, while the magnetic return means uses materials with high thermal conductivity for heat dissipation. This local optimization allows each component to excel at its primary function while contributing to overall system performance.
Solution Approach 2:
The stator employs composite construction with different materials for teeth and magnetic return means. This allows combining materials with superior magnetic properties in the teeth and materials with superior thermal properties in the magnetic return, achieving both magnetic efficiency and thermal management without compromising either function.
3Area of stationary object
If stator teeth are closely arranged for compact design, then space utilization improves, but heat dissipation paths are limited
Solution Approach 1:
The patent extends heat dissipation from a two-dimensional surface function to a three-dimensional volumetric function by incorporating the magnetic return means as an additional heat conduction path. This adds a new dimension to heat dissipation, allowing heat to be conducted away through multiple spatial paths simultaneously, thereby improving thermal management without increasing the stator's footprint.
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 solution significantly improves heat dissipation and power output by utilizing regions outside the magnetic flux for efficient heat conduction and weight reduction, increasing continuous power by a factor of 1.5-2 and allowing for more efficient cooling through multiple parallel paths.
Implementation Method 1
intermediate elements made from materials with higher thermal conductivity... enhancing axial heat conduction
Implementation Method 2
which also allow for fluid-type cooling arrangements or heatpipes
Data Source
AI summary
An internal stator of a rotary field machine has a number of N stator teeth. Two stator teeth each form a number of N/2 tooth groups, wherein one tooth group each is formed by two directly adjacently arranged stator teeth has a pole core and a pole shoe formed thereon, and thus, the inner stator comprises semi-closed grooves. The pole cores are made of a first material, for example, silicon iron. In addition thereto, an intermediate element extending in the axial direction of the stator is arranged between each of two stator teeth of two adjacent tooth groups, which is made of a different material. The second material of the intermediate element is different from the first material of the stator teeth.