Outer Rotor Motor Vent Structure for Coil Cooling
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Solution Overview
Problem
High-output motors, particularly of the outer rotor type, face insufficient cooling due to restricted air flow in configurations where air flows axially, leading to inadequate heat dissipation from the coils.
Innovation Solution
The motor design incorporates a rotor with spoke portions that function as an axial flow fan, a stator with coils and a support member featuring slits and vent holes for enhanced air flow and heat dissipation, allowing air to circulate between coils and through the stator core, and utilizing heat transfer members for efficient heat transfer and dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If air flows axially through the motor to cool the coils, then cooling efficiency is improved, but the entire lower surface of the support portion may be closed by the device causing insufficient cooling
Solution Approach 1:
The support portion is divided into multiple regions by providing slits that extend radially inward from the outer circumferential end. These slits create multiple air flow paths through the support portion, allowing cooling air to reach the coils from different directions and positions, thereby maintaining effective cooling even when the lower surface is partially closed by device integration.
Solution Approach 2:
The air flow path is extended from a single axial direction to multiple dimensions by adding radial air flow paths through the slits in the support portion. This multi-directional approach allows cooling air to penetrate the support structure and reach the coils from radial directions, compensating for blocked axial flow paths when integrated into devices.
2Adaptability or versatility
If the motor is integrated into devices with closed lower surfaces, then device integration is improved, but cooling efficiency deteriorates
Solution Approach 1:
The support portion is segmented into multiple regions by providing slits that extend radially inward from the outer circumferential end. These slits create multiple air flow paths through the support portion, allowing cooling air to reach the coils from different directions and positions, thereby maintaining effective cooling even when the lower surface is partially closed by device integration.
Solution Approach 2:
The slits are strategically positioned at specific locations in the support portion to create localized air flow channels. This allows the motor to maintain cooling capability at critical locations (where slits provide air paths) even when other areas are closed off by device integration, enabling adaptability to various device configurations.
3Temperature
If the rotor has blade shape to cause air flow in axial direction, then heat dissipation is improved, but cooling is insufficient when lower surface is closed
Solution Approach 1:
The support portion is divided into multiple regions by providing slits that extend radially inward from the outer circumferential end. These slits create multiple air flow paths through the support portion, allowing cooling air to reach the coils from different directions and positions, thereby maintaining effective cooling even when the lower surface is partially closed by device integration.
Solution Approach 2:
The air flow path is extended from a single axial direction to multiple dimensions by adding radial air flow paths through the slits in the support portion. This multi-directional approach allows cooling air to penetrate the support structure and reach the coils from radial directions, compensating for blocked axial flow paths when integrated into devices.
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 effectively enhances cooling efficiency by utilizing air flow to dissipate heat from both the rotor and stator, ensuring efficient heat management even when the motor is integrated into devices that may restrict airflow.
Implementation Method 1
a rotor (20) that is rotatable about a central axis (J), a stator (30) positioned radially inside the rotor (20), and a support member (40) that supports the stator (30). The rotor (20) includes a rotor magnet (25) radially facing the stator (30), a magnet holding portion (24) that is annular and holds the rotor magnet (25), and a plurality of spoke portions (23) radially extending from an upper end portion of the magnet holding portion (24) through an upper side of the stator (30)
Implementation Method 2
utilizing heat transfer members for efficient heat transfer and dissipation
Implementation Method 3
allowing air to circulate between coils and through the stator core
Data Source
AI summary
A motor includes a rotor, a stator, and a support member. The rotor includes a rotor magnet, a magnet holding portion, and spoke portions. The stator includes a plurality of coils and a stator core. The support member includes a stator holding portion and a mount portion. The mount portion includes a plurality of slits extending radially inward from a radially outer end portion of the mount portion. The slits each have openings in an outer circumferential end and an upper surface of the mount portion. The openings of the slits positioned in the upper surface of the mount portion are positioned between the coils adjacent to each other in the circumferential direction when viewed in the axial direction.