Fan Motor Guide for Internal Heatsink Cooling
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Solution Overview
Problem
Conventional fan motors face insufficient cooling of heat generating elements when they are disposed inside the radial direction range of the rotor housing, as air intake is diverted through the opening in the rotor housing, preventing sufficient airflow to the heat generating elements and heatsinks.
Innovation Solution
A fan motor design that includes a guide forming an airflow guiding path between the heat-dissipation portion of the heatsink and the air intake port, directing air from the radial direction outside toward the center of the motor unit, ensuring air is supplied to the heat generating elements and heatsinks for effective cooling, even when they are inside the radial direction range of the rotor housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If heat generating elements are disposed inside the radial direction range of the rotor housing, then the circuit board layout flexibility is improved, but the cooling performance deteriorates due to insufficient airflow supply
Solution Approach 1:
The airflow path is segmented into two distinct paths: one for the stator and one for the heat generating elements. The guide structure creates a dedicated airflow guiding path that separates the cooling airflow for heat generating elements from the general airflow through the rotor housing, ensuring sufficient cooling airflow is directed to components located inside the radial direction range of the rotor housing.
Solution Approach 2:
The guide structure acts as an intermediary component that intercepts and redirects airflow. It is positioned between the air intake port and the heat generating elements, capturing airflow that would otherwise bypass the heat generating elements and directing it through the airflow guiding path to provide adequate cooling.
2Area of stationary object
If air intake port is positioned at the periphery of the rotor housing, then the air intake area is improved, but the airflow distribution to internal components deteriorates
Solution Approach 1:
The guide structure creates a localized airflow path with specific quality characteristics. It forms a dedicated airflow guiding path that concentrates and directs airflow specifically toward the heat generating elements, ensuring that the local airflow quantity and velocity are sufficient for effective cooling of components positioned inside the rotor housing radial range.
3Ease of manufacture
If heat generating elements are mounted on the circuit board inside the rotor housing radial range, then the manufacturing process is simplified, but the cooling efficiency deteriorates due to air bypassing through the rotor housing opening
Solution Approach 1:
The guide structure performs preliminary anti-action by preemptively intercepting and redirecting airflow before it can bypass the heat generating elements. The guide is positioned to capture airflow early in its path and redirect it through the airflow guiding path, preventing the harmful bypass flow pattern from developing and ensuring cooling airflow reaches the heat generating elements effectively.
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 secures improved cooling performance for both the heat generating elements and the stator by directing airflow through a dedicated guiding path, enhancing the cooling efficiency and preventing air from bypassing the heat generating elements inside the rotor housing.
Implementation Method 1
a heatsink that includes a heat-dissipation portion disposed on the plate-shaped portion side of the circuit board so as to contact the heat generating element either directly or through a thermally conductive material
Implementation Method 2
When air that has been taken in through the air intake port accompanying rotation of the fan flows along the airflow guiding path, the heat generating element is cooled by the heatsink
Data Source
AI summary
A circuit board includes a board body disposed on the opposite side of a plate-shaped portion of a center piece to a stator, and a heat generating element mounted to a surface on the plate-shaped portion side of the board body and disposed inside a radial direction range of a rotor housing. A heat-dissipation portion of a heatsink is on the plate-shaped portion side of the circuit board such that the heat-dissipation portion contacts the heat generating element either directly or through a thermally conductive material. A guide that opposes the heat-dissipation portion in an axial direction of a motor unit is formed at the plate-shaped portion. The guide forms an airflow guiding path between itself and the heat-dissipation portion, the airflow guiding path being shaped so as to guide air taken in through an air intake port from the radial direction outside toward a center of the motor unit.