Outer Rotor Motor Cooling Fan Axial Winding Support
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Solution Overview
Problem
Outer rotor cooling fans face challenges in supporting long windings sections, leading to deflection and vibration, which affect airflow efficiency and increase costs due to larger component sizes.
Innovation Solution
A cooling fan design that includes a motor housing with support members connecting to a fan housing, stabilizing the windings section through a hub extending the full length of the motor, and using a magnet assembly with individual piece magnets to reduce weight and enhance airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the diameter of the windings section increases to generate more power, then the power output increases, but either the diameter of the fan increases or the free area through the fan decreases
Solution Approach 1:
The patent transitions from increasing diameter to increasing length of the windings section. By extending the windings section along the axial dimension rather than radially outward, the motor generates more power without increasing fan diameter, thereby preserving the free area through the fan for airflow.
2Power
If the length of the windings section increases to generate more power, then the power output increases, but the length of the fan increases and the windings section becomes difficult to properly support
Solution Approach 1:
The patent introduces a hub as an intermediary component that provides structural support for the extended windings section. The hub acts as a mediator between the windings section and the motor housing, distributing loads and preventing deflection without requiring the entire fan assembly to be longer.
Solution Approach 2:
The patent redistributes the windings section along the axial dimension rather than extending it radially, allowing the motor to generate more power while maintaining a compact overall footprint and improving supportability through the hub structure.
3Power
If the size of the motor increases to generate more power, then the power output increases, but the cost of the component parts increases
Solution Approach 1:
The patent achieves increased power output by extending the windings section axially rather than increasing the radial size of the motor. This dimensional change allows for more power generation while maintaining a compact motor size, thereby reducing material costs and manufacturing expenses.
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 reduces deflection and vibration, increases airflow capacity, and minimizes acoustic emissions while maintaining high power generation, thus improving cooling efficiency and reducing costs.
Implementation Method 1
Outer rotor motors that utilize a windings section with magnets disposed outside the windings. As electrical current flows through the windings, the magnets rotate about the axis of the motor.
Implementation Method 2
One type of cooling system is a forced air system that relies on one or more cooling fans to blow air over the electronic components in order to cool the components.
Data Source
AI summary
A cooling fan with an outer rotor motor supported by a fan housing. A motor housing is disposed within a conduit through the fan housing, while the outer rotor motor is disposed within the motor housing. A plurality of support members coupled between the motor housing and the fan housing enable the fan housing to support the motor housing. A hub is rotatably coupled to the outer rotor motor and has a first portion disposed within the motor housing and a second portion disposed outside of the motor housing. A plurality of blades extends radially from the second portion said hub.