Outer Rotor Motor Cover With Integrated Fan for Axial Cooling
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Solution Overview
Problem
Existing brushless DC electric motors lack an integrated cooling solution that efficiently directs airflow to enhance cooling and functionality, particularly in applications where thermal management is critical.
Innovation Solution
An outer rotor brushless DC electric motor design featuring a rotor body, shaft, cover, and integrally formed fan as a single piece, with radially extending blades that induce axial airflow parallel to the rotational axis, providing effective cooling and potential debris removal capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a separate cooling fan is added to the motor, then cooling efficiency is improved, but device complexity increases
Solution Approach 1:
The fan is integrally formed with the motor cover as a single piece, combining the cooling fan function with the motor housing structure. This eliminates the need for a separate cooling fan component while maintaining effective cooling capability through the radially extending blades that induce axial airflow parallel to the rotational axis.
Solution Approach 2:
The motor cover serves dual functions: it provides structural protection for the motor components and simultaneously acts as a cooling fan through its integrally formed radially extending blades. This multi-functional design allows the cover to both enclose and cool the motor without adding separate components.
2Ease of manufacture
If an integrated fan is formed with the cover, then manufacturing complexity increases, but assembly steps are reduced
Solution Approach 1:
The fan and motor cover are formed as a single integrated component, which reduces the number of parts that need to be assembled. Although the manufacturing process for the integrated component may be more complex, it eliminates separate assembly steps for attaching a fan to the cover, simplifying the overall assembly process.
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
The design enhances cooling efficiency and operational performance by ensuring consistent airflow around the motor and associated electronics, while also enabling applications like blower systems for debris dispersal, improving overall motor functionality and reliability.
Implementation Method 1
The fan includes a plurality of blades extending radially outward of the cover and configured to induce an airflow along an exterior surface of the cover in a direction parallel with the rotational axis
Data Source
AI summary
An outer rotor for use with a brushless DC electric motor includes a rotor body, a shaft coupled for co-rotation with the rotor body and defining a rotational axis, a cover surrounding at least a portion of the rotor body, and a fan integrally formed with the cover as a single piece. The fan includes a plurality of blades extending radially outward of the cover and configured to induce an airflow along an exterior surface of the cover in a direction parallel with the rotational axis.