Rotating Machine Control Board Cooling With Recessed Heat Sink
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Solution Overview
Problem
Conventional rotating electrical machines face inadequate heat dissipation due to a small heat dissipating surface area of heating elements, especially during high output conditions, and existing solutions that expand heat dissipation performance by using recessed heat sinks require careful consideration of element variations and assembly positions, leading to decreased performance as the number of elements increases.
Innovation Solution
A rotating electrical machine design featuring a control board with a heating element on its surface and a recessed heat sink opposite to it, with a heat dissipating material in the gap between the element and the recess, allowing for an expanded heat dissipating surface area and improved performance by optimizing the gap dimensions and material distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a recessed heat sink structure is used to improve heat dissipation, then heat dissipation performance is improved, but manufacturing precision requirements increase due to the need to control gaps between heating elements and the recess
Solution Approach 1:
The patent changes the geometric parameters of the recess structure, specifically making the recess width larger than the heating element width. This parameter change allows for a larger gap between the heating element side surfaces and the recess, reducing manufacturing precision requirements while maintaining effective heat dissipation through the top and bottom surfaces of the heating element.
2Ease of manufacture
If the gap between heating element side surfaces and recess is widened to accommodate variations, then ease of manufacture is improved, but heat dissipation performance decreases
Solution Approach 1:
The patent optimizes the recess dimensions by setting the recess width to be larger than the heating element width, creating an appropriate gap size. This gap is wide enough to accommodate manufacturing variations and assembly tolerances, yet narrow enough to maintain effective heat dissipation. The heat dissipating material fills this gap to ensure good thermal contact.
3Loss of energy
If heat dissipating surface area is increased to improve heat dissipation, then heat dissipation performance is improved, but device complexity increases
Solution Approach 1:
The patent utilizes three-dimensional space by creating a recess structure that allows heat dissipation from multiple surfaces (top and bottom) of the heating element. This dimensional approach increases the effective heat dissipation area without requiring a proportionally larger or more complex heat sink structure, as the recess efficiently utilizes the available space around the heating element.
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 expands the heat dissipating surface area and enhances heat dissipation performance, stabilizing thermal management even under increased heat generation, while minimizing the need for thicker heat sinks and maintaining precise gap control.
Implementation Method 1
a heat dissipating material formed in a gap between the heating element and the recess
Implementation Method 2
a heat sink having a recess that accommodates the heating element on a surface opposite to the main surface
Data Source
AI summary
A rotating electrical machine that includes a heat dissipating structure of a heat generating portion of a control board includes the control board that includes a heating element on top of a main surface, a heat sink disposed so as to oppose the main surface, and includes a recess that accommodates the heating element on an opposite surface that oppose the main surface, and a heat dissipating material formed in a gap between the heating element and the recess.