Outer Rotor Motor Heat Dissipation via Relocated Air Guide Cover
Solution Overview
Problem
Conventional outer rotor motor heat dissipation devices have inefficient heat dissipation due to a long and complex heat dissipation path with slow air flow and low flow rate, requiring numerous small through holes that complicate the structure and installation.
Innovation Solution
The heat dissipation device incorporates an air guide cover with protrusions featuring through holes that are not limited by adjacent heat dissipation blades, allowing for increased air flow and improved heat dissipation efficiency, with a metal air guide cover and second heat dissipation ribs enhancing heat transfer and assembly ease.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If through holes are disposed between adjacent heat dissipation ribs on the bottom plate, then cold air can enter the fan inlet through the air flow channel, but the size of the through holes is greatly limited and a large number of through holes are required, leading to complex structure and difficult installation
Solution Approach 1:
The patent extracts the through holes from the bottom plate between heat dissipation ribs and relocates them to the air guide cover. Specifically, the air guide cover includes a top end with protrusions, and each protrusion includes a through hole communicating with the vertical air duct. This extraction allows the through holes to be positioned outside the heat dissipation blades area, eliminating the size constraints imposed by the spacing between ribs while reducing the total number of holes needed.
Solution Approach 2:
The patent transitions the through hole positioning from a two-dimensional constraint on the bottom plate surface between ribs to a three-dimensional arrangement on the air guide cover protrusions. The through holes are disposed directly below the air inlet of the wind wheel, utilizing the vertical dimension and the protrusion structure to achieve larger hole sizes without increasing structural complexity.
2Speed
If a plurality of heat dissipation ribs are disposed on the outer surface of the control box and an air guide cover is disposed outside to form a directional air flow channel, then the directional air flow is accelerated and heat dissipation is improved, but the through holes must be limited between adjacent heat dissipation ribs
Solution Approach 1:
The through holes are extracted from the constrained bottom plate location and relocated to the air guide cover protrusions. This relocation allows the through holes to be positioned where they communicate with vertical air ducts directly, enabling larger hole areas that are not restricted by the spacing between heat dissipation ribs on the bottom plate.
3Ease of operation
If numerous small through holes are required to allow cold air entry, then air can pass through to the fan inlet, but the structure becomes complex and installation becomes difficult
Solution Approach 1:
The through holes are extracted from the bottom plate and integrated into the air guide cover protrusions. This consolidation reduces the total number of through holes needed while increasing individual hole size, thereby simplifying the overall structure and making installation easier.
Solution Approach 2:
The patent merges the function of multiple small through holes into fewer, larger through holes located on the air guide cover protrusions. By combining the air intake function into these strategically positioned larger holes, the structure is simplified and installation is facilitated.
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 enhances air flow and heat dissipation efficiency by eliminating size constraints on through holes, simplifying assembly and improving thermal management for outer rotor motors.
Implementation Method 1
a wind wheel attached to a bottom end face of the flange
Implementation Method 2
a plurality of vertical heat dissipation blades protruding from an outer surface of the box body
Data Source
AI summary
A heat dissipation device for an outer rotor motor, including: a rotary shaft, a stator assembly, an outer rotor, a sleeve seat, a wind wheel, an air guide cover, and a control box. The sleeve seat includes a bottom plate and a sleeve protruding upwards from a central part of the bottom plate; each of two ends of the sleeve includes a bearing chamber, and two bearings are disposed in two bearing chambers, respectively. The rotary shaft is disposed in the sleeve and both ends of the rotary shaft are supported on the two bearings. The outer rotor includes a casing sleeve, a plurality of permanent magnets attached to the inner wall of the casing sleeve, and a flange. One end of the rotary shaft extends from the sleeve and is connected to the casing sleeve. The inner wall of the casing sleeve extends outward to form the flange.