Outer Rotor Motor Cover Structure for Shaft Rigidity
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Solution Overview
Problem
The shaft rigidity during rotation of the rotor in an outer rotor type motor is insufficient due to the heavy lid part being fixed to one side, imposing a large load on the shaft and the ball bearing at the upper part.
Innovation Solution
The motor design includes a cover with a protruding part and an arm part that protrude toward the bearing, providing additional support to the shaft, and a recessed space is formed to reduce the weight and improve shaft rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the lid part is fixed to one side of the shaft, then the structure is simple and easy to manufacture, but the shaft rigidity during rotation becomes insufficient
Solution Approach 1:
The cover is divided into multiple functional parts: a main cover body, a protruding part extending axially toward the bearing, and an arm part extending radially inward. This segmentation allows each part to serve a specific function - the protruding part provides axial support to the shaft while the arm part enhances radial stability, thereby improving shaft rigidity without complicating the overall manufacturing process
Solution Approach 2:
The cover structure extends in multiple dimensions - axially (protruding part) and radially (arm part) - to provide comprehensive support to the shaft. This multi-dimensional approach enhances shaft rigidity in various directions simultaneously while maintaining a relatively simple single-piece construction that is easy to manufacture
2Device complexity
If the lid part is fixed to one side of the shaft, then the structure is simple, but a large load is imposed on the shaft and ball bearing
Solution Approach 1:
The cover is segmented into a main body, an axial protruding part, and a radial arm part. This segmentation distributes the load-bearing functions across different parts of the cover structure, allowing the protruding part to specifically support axial loads on the shaft while the main body provides overall structural support, thereby reducing the concentrated load on the shaft and bearing
Solution Approach 2:
The protruding part of the cover acts as an intermediary element between the cover and the shaft. It provides an additional support point that mediates the load transmission from the heavy lid part to the shaft, distributing the axial load more evenly and reducing the stress concentration on both the shaft and the ball bearing
Data Source
AI summary
To improve rigidity during rotation of a rotor in a motor. A motor of the disclosure includes a shaft, a stator, a bearing disposed between the shaft and the stator, and a rotor rotating integrally with the shaft, wherein the rotor includes a magnet and a cover fixed to the shaft and covering the magnet, and the cover includes a protruding part protruding toward the bearing in an axial direction, and an arm part protruding from the protruding part toward the bearing in the axial direction.